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freebsd-dev/contrib/tcl/unix/tclUnixChan.c
Paul Traina f25b19db8d Import TCL v8.0 PL2.
1997-11-27 19:49:05 +00:00

2566 lines
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/*
* tclUnixChan.c
*
* Common channel driver for Unix channels based on files, command
* pipes and TCP sockets.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclUnixChan.c 1.207 97/11/04 14:45:29
*/
#include "tclInt.h" /* Internal definitions for Tcl. */
#include "tclPort.h" /* Portability features for Tcl. */
/*
* sys/ioctl.h has already been included by tclPort.h. Including termios.h
* or termio.h causes a bunch of warning messages because some duplicate
* (but not contradictory) #defines exist in termios.h and/or termio.h
*/
#undef NL0
#undef NL1
#undef CR0
#undef CR1
#undef CR2
#undef CR3
#undef TAB0
#undef TAB1
#undef TAB2
#undef XTABS
#undef BS0
#undef BS1
#undef FF0
#undef FF1
#undef ECHO
#undef NOFLSH
#undef TOSTOP
#undef FLUSHO
#undef PENDIN
#ifdef USE_TERMIOS
# include <termios.h>
#else /* !USE_TERMIOS */
#ifdef USE_TERMIO
# include <termio.h>
#else /* !USE_TERMIO */
#ifdef USE_SGTTY
# include <sgtty.h>
#endif /* USE_SGTTY */
#endif /* !USE_TERMIO */
#endif /* !USE_TERMIOS */
/*
* The following structure is used to set or get the serial port
* attributes in a platform-independant manner.
*/
typedef struct TtyAttrs {
int baud;
int parity;
int data;
int stop;
} TtyAttrs;
/*
* This structure describes per-instance state of a file based channel.
*/
typedef struct FileState {
Tcl_Channel channel; /* Channel associated with this file. */
int fd; /* File handle. */
int validMask; /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, or TCL_EXCEPTION: indicates
* which operations are valid on the file. */
struct FileState *nextPtr; /* Pointer to next file in list of all
* file channels. */
} FileState;
/*
* List of all file channels currently open.
*/
static FileState *firstFilePtr = NULL;
/*
* This structure describes per-instance state of a tcp based channel.
*/
typedef struct TcpState {
Tcl_Channel channel; /* Channel associated with this file. */
int fd; /* The socket itself. */
int flags; /* ORed combination of the bitfields
* defined below. */
Tcl_TcpAcceptProc *acceptProc;
/* Proc to call on accept. */
ClientData acceptProcData; /* The data for the accept proc. */
} TcpState;
/*
* These bits may be ORed together into the "flags" field of a TcpState
* structure.
*/
#define TCP_ASYNC_SOCKET (1<<0) /* Asynchronous socket. */
#define TCP_ASYNC_CONNECT (1<<1) /* Async connect in progress. */
/*
* The following defines the maximum length of the listen queue. This is
* the number of outstanding yet-to-be-serviced requests for a connection
* on a server socket, more than this number of outstanding requests and
* the connection request will fail.
*/
#ifndef SOMAXCONN
#define SOMAXCONN 100
#endif
#if (SOMAXCONN < 100)
#undef SOMAXCONN
#define SOMAXCONN 100
#endif
/*
* The following defines how much buffer space the kernel should maintain
* for a socket.
*/
#define SOCKET_BUFSIZE 4096
/*
* Static routines for this file:
*/
static TcpState * CreateSocket _ANSI_ARGS_((Tcl_Interp *interp,
int port, char *host, int server,
char *myaddr, int myport, int async));
static int CreateSocketAddress _ANSI_ARGS_(
(struct sockaddr_in *sockaddrPtr,
char *host, int port));
static int FileBlockModeProc _ANSI_ARGS_((
ClientData instanceData, int mode));
static int FileCloseProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp));
static int FileGetHandleProc _ANSI_ARGS_((ClientData instanceData,
int direction, ClientData *handlePtr));
static int FileInputProc _ANSI_ARGS_((ClientData instanceData,
char *buf, int toRead, int *errorCode));
static int FileOutputProc _ANSI_ARGS_((
ClientData instanceData, char *buf, int toWrite,
int *errorCode));
static int FileSeekProc _ANSI_ARGS_((ClientData instanceData,
long offset, int mode, int *errorCode));
static void FileWatchProc _ANSI_ARGS_((ClientData instanceData,
int mask));
static void TcpAccept _ANSI_ARGS_((ClientData data, int mask));
static int TcpBlockModeProc _ANSI_ARGS_((ClientData data,
int mode));
static int TcpCloseProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp));
static int TcpGetHandleProc _ANSI_ARGS_((ClientData instanceData,
int direction, ClientData *handlePtr));
static int TcpGetOptionProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp, char *optionName,
Tcl_DString *dsPtr));
static int TcpInputProc _ANSI_ARGS_((ClientData instanceData,
char *buf, int toRead, int *errorCode));
static int TcpOutputProc _ANSI_ARGS_((ClientData instanceData,
char *buf, int toWrite, int *errorCode));
static void TcpWatchProc _ANSI_ARGS_((ClientData instanceData,
int mask));
static int TtyParseMode _ANSI_ARGS_((Tcl_Interp *interp,
CONST char *mode, int *speedPtr, int *parityPtr,
int *dataPtr, int *stopPtr));
static void TtyGetAttributes _ANSI_ARGS_((int fd,
TtyAttrs *ttyPtr));
static int TtyGetOptionProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp, char *optionName,
Tcl_DString *dsPtr));
static void TtyInit _ANSI_ARGS_((int fd));
static void TtySetAttributes _ANSI_ARGS_((int fd,
TtyAttrs *ttyPtr));
static int TtySetOptionProc _ANSI_ARGS_((ClientData instanceData,
Tcl_Interp *interp, char *optionName,
char *value));
static int WaitForConnect _ANSI_ARGS_((TcpState *statePtr,
int *errorCodePtr));
/*
* This structure describes the channel type structure for file based IO:
*/
static Tcl_ChannelType fileChannelType = {
"file", /* Type name. */
FileBlockModeProc, /* Set blocking/nonblocking mode.*/
FileCloseProc, /* Close proc. */
FileInputProc, /* Input proc. */
FileOutputProc, /* Output proc. */
FileSeekProc, /* Seek proc. */
NULL, /* Set option proc. */
NULL, /* Get option proc. */
FileWatchProc, /* Initialize notifier. */
FileGetHandleProc, /* Get OS handles out of channel. */
};
/*
* This structure describes the channel type structure for serial IO.
* Note that this type is a subclass of the "file" type.
*/
static Tcl_ChannelType ttyChannelType = {
"tty", /* Type name. */
FileBlockModeProc, /* Set blocking/nonblocking mode.*/
FileCloseProc, /* Close proc. */
FileInputProc, /* Input proc. */
FileOutputProc, /* Output proc. */
NULL, /* Seek proc. */
TtySetOptionProc, /* Set option proc. */
TtyGetOptionProc, /* Get option proc. */
FileWatchProc, /* Initialize notifier. */
FileGetHandleProc, /* Get OS handles out of channel. */
};
/*
* This structure describes the channel type structure for TCP socket
* based IO:
*/
static Tcl_ChannelType tcpChannelType = {
"tcp", /* Type name. */
TcpBlockModeProc, /* Set blocking/nonblocking mode.*/
TcpCloseProc, /* Close proc. */
TcpInputProc, /* Input proc. */
TcpOutputProc, /* Output proc. */
NULL, /* Seek proc. */
NULL, /* Set option proc. */
TcpGetOptionProc, /* Get option proc. */
TcpWatchProc, /* Initialize notifier. */
TcpGetHandleProc, /* Get OS handles out of channel. */
};
/*
*----------------------------------------------------------------------
*
* FileBlockModeProc --
*
* Helper procedure to set blocking and nonblocking modes on a
* file based channel. Invoked by generic IO level code.
*
* Results:
* 0 if successful, errno when failed.
*
* Side effects:
* Sets the device into blocking or non-blocking mode.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
FileBlockModeProc(instanceData, mode)
ClientData instanceData; /* File state. */
int mode; /* The mode to set. Can be one of
* TCL_MODE_BLOCKING or
* TCL_MODE_NONBLOCKING. */
{
FileState *fsPtr = (FileState *) instanceData;
int curStatus;
#ifndef USE_FIONBIO
curStatus = fcntl(fsPtr->fd, F_GETFL);
if (mode == TCL_MODE_BLOCKING) {
curStatus &= (~(O_NONBLOCK));
} else {
curStatus |= O_NONBLOCK;
}
if (fcntl(fsPtr->fd, F_SETFL, curStatus) < 0) {
return errno;
}
curStatus = fcntl(fsPtr->fd, F_GETFL);
#else
if (mode == TCL_MODE_BLOCKING) {
curStatus = 0;
} else {
curStatus = 1;
}
if (ioctl(fsPtr->fd, (int) FIONBIO, &curStatus) < 0) {
return errno;
}
#endif
return 0;
}
/*
*----------------------------------------------------------------------
*
* FileInputProc --
*
* This procedure is invoked from the generic IO level to read
* input from a file based channel.
*
* Results:
* The number of bytes read is returned or -1 on error. An output
* argument contains a POSIX error code if an error occurs, or zero.
*
* Side effects:
* Reads input from the input device of the channel.
*
*----------------------------------------------------------------------
*/
static int
FileInputProc(instanceData, buf, toRead, errorCodePtr)
ClientData instanceData; /* File state. */
char *buf; /* Where to store data read. */
int toRead; /* How much space is available
* in the buffer? */
int *errorCodePtr; /* Where to store error code. */
{
FileState *fsPtr = (FileState *) instanceData;
int bytesRead; /* How many bytes were actually
* read from the input device? */
*errorCodePtr = 0;
/*
* Assume there is always enough input available. This will block
* appropriately, and read will unblock as soon as a short read is
* possible, if the channel is in blocking mode. If the channel is
* nonblocking, the read will never block.
*/
bytesRead = read(fsPtr->fd, buf, (size_t) toRead);
if (bytesRead > -1) {
return bytesRead;
}
*errorCodePtr = errno;
return -1;
}
/*
*----------------------------------------------------------------------
*
* FileOutputProc--
*
* This procedure is invoked from the generic IO level to write
* output to a file channel.
*
* Results:
* The number of bytes written is returned or -1 on error. An
* output argument contains a POSIX error code if an error occurred,
* or zero.
*
* Side effects:
* Writes output on the output device of the channel.
*
*----------------------------------------------------------------------
*/
static int
FileOutputProc(instanceData, buf, toWrite, errorCodePtr)
ClientData instanceData; /* File state. */
char *buf; /* The data buffer. */
int toWrite; /* How many bytes to write? */
int *errorCodePtr; /* Where to store error code. */
{
FileState *fsPtr = (FileState *) instanceData;
int written;
*errorCodePtr = 0;
written = write(fsPtr->fd, buf, (size_t) toWrite);
if (written > -1) {
return written;
}
*errorCodePtr = errno;
return -1;
}
/*
*----------------------------------------------------------------------
*
* FileCloseProc --
*
* This procedure is called from the generic IO level to perform
* channel-type-specific cleanup when a file based channel is closed.
*
* Results:
* 0 if successful, errno if failed.
*
* Side effects:
* Closes the device of the channel.
*
*----------------------------------------------------------------------
*/
static int
FileCloseProc(instanceData, interp)
ClientData instanceData; /* File state. */
Tcl_Interp *interp; /* For error reporting - unused. */
{
FileState *fsPtr = (FileState *) instanceData;
FileState **nextPtrPtr;
int errorCode = 0;
Tcl_DeleteFileHandler(fsPtr->fd);
if (!TclInExit()
|| ((fsPtr->fd != 0) && (fsPtr->fd != 1) && (fsPtr->fd != 2))) {
if (close(fsPtr->fd) < 0) {
errorCode = errno;
}
}
for (nextPtrPtr = &firstFilePtr; (*nextPtrPtr) != NULL;
nextPtrPtr = &((*nextPtrPtr)->nextPtr)) {
if ((*nextPtrPtr) == fsPtr) {
(*nextPtrPtr) = fsPtr->nextPtr;
break;
}
}
ckfree((char *) fsPtr);
return errorCode;
}
/*
*----------------------------------------------------------------------
*
* FileSeekProc --
*
* This procedure is called by the generic IO level to move the
* access point in a file based channel.
*
* Results:
* -1 if failed, the new position if successful. An output
* argument contains the POSIX error code if an error occurred,
* or zero.
*
* Side effects:
* Moves the location at which the channel will be accessed in
* future operations.
*
*----------------------------------------------------------------------
*/
static int
FileSeekProc(instanceData, offset, mode, errorCodePtr)
ClientData instanceData; /* File state. */
long offset; /* Offset to seek to. */
int mode; /* Relative to where
* should we seek? Can be
* one of SEEK_START,
* SEEK_SET or SEEK_END. */
int *errorCodePtr; /* To store error code. */
{
FileState *fsPtr = (FileState *) instanceData;
int newLoc;
newLoc = lseek(fsPtr->fd, offset, mode);
*errorCodePtr = (newLoc == -1) ? errno : 0;
return newLoc;
}
/*
*----------------------------------------------------------------------
*
* FileWatchProc --
*
* Initialize the notifier to watch the fd from this channel.
*
* Results:
* None.
*
* Side effects:
* Sets up the notifier so that a future event on the channel will
* be seen by Tcl.
*
*----------------------------------------------------------------------
*/
static void
FileWatchProc(instanceData, mask)
ClientData instanceData; /* The file state. */
int mask; /* Events of interest; an OR-ed
* combination of TCL_READABLE,
* TCL_WRITABLE and TCL_EXCEPTION. */
{
FileState *fsPtr = (FileState *) instanceData;
/*
* Make sure we only register for events that are valid on this file.
* Note that we are passing Tcl_NotifyChannel directly to
* Tcl_CreateFileHandler with the channel pointer as the client data.
*/
mask &= fsPtr->validMask;
if (mask) {
Tcl_CreateFileHandler(fsPtr->fd, mask,
(Tcl_FileProc *) Tcl_NotifyChannel,
(ClientData) fsPtr->channel);
} else {
Tcl_DeleteFileHandler(fsPtr->fd);
}
}
/*
*----------------------------------------------------------------------
*
* FileGetHandleProc --
*
* Called from Tcl_GetChannelFile to retrieve OS handles from
* a file based channel.
*
* Results:
* Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if
* there is no handle for the specified direction.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
FileGetHandleProc(instanceData, direction, handlePtr)
ClientData instanceData; /* The file state. */
int direction; /* TCL_READABLE or TCL_WRITABLE */
ClientData *handlePtr; /* Where to store the handle. */
{
FileState *fsPtr = (FileState *) instanceData;
if (direction & fsPtr->validMask) {
*handlePtr = (ClientData) fsPtr->fd;
return TCL_OK;
} else {
return TCL_ERROR;
}
}
/*
*----------------------------------------------------------------------
*
* TtySetOptionProc --
*
* Sets an option on a channel.
*
* Results:
* A standard Tcl result. Also sets interp->result on error if
* interp is not NULL.
*
* Side effects:
* May modify an option on a device.
* Sets Error message if needed (by calling Tcl_BadChannelOption).
*
*----------------------------------------------------------------------
*/
static int
TtySetOptionProc(instanceData, interp, optionName, value)
ClientData instanceData; /* File state. */
Tcl_Interp *interp; /* For error reporting - can be NULL. */
char *optionName; /* Which option to set? */
char *value; /* New value for option. */
{
FileState *fsPtr = (FileState *) instanceData;
unsigned int len;
TtyAttrs tty;
len = strlen(optionName);
if ((len > 1) && (strncmp(optionName, "-mode", len) == 0)) {
if (TtyParseMode(interp, value, &tty.baud, &tty.parity, &tty.data,
&tty.stop) != TCL_OK) {
return TCL_ERROR;
}
/*
* system calls results should be checked there. -- dl
*/
TtySetAttributes(fsPtr->fd, &tty);
return TCL_OK;
} else {
return Tcl_BadChannelOption(interp, optionName, "mode");
}
}
/*
*----------------------------------------------------------------------
*
* TtyGetOptionProc --
*
* Gets a mode associated with an IO channel. If the optionName arg
* is non NULL, retrieves the value of that option. If the optionName
* arg is NULL, retrieves a list of alternating option names and
* values for the given channel.
*
* Results:
* A standard Tcl result. Also sets the supplied DString to the
* string value of the option(s) returned.
*
* Side effects:
* The string returned by this function is in static storage and
* may be reused at any time subsequent to the call.
* Sets Error message if needed (by calling Tcl_BadChannelOption).
*
*----------------------------------------------------------------------
*/
static int
TtyGetOptionProc(instanceData, interp, optionName, dsPtr)
ClientData instanceData; /* File state. */
Tcl_Interp *interp; /* For error reporting - can be NULL. */
char *optionName; /* Option to get. */
Tcl_DString *dsPtr; /* Where to store value(s). */
{
FileState *fsPtr = (FileState *) instanceData;
unsigned int len;
char buf[32];
TtyAttrs tty;
if (optionName == NULL) {
Tcl_DStringAppendElement(dsPtr, "-mode");
len = 0;
} else {
len = strlen(optionName);
}
if ((len == 0) ||
((len > 1) && (strncmp(optionName, "-mode", len) == 0))) {
TtyGetAttributes(fsPtr->fd, &tty);
sprintf(buf, "%d,%c,%d,%d", tty.baud, tty.parity, tty.data, tty.stop);
Tcl_DStringAppendElement(dsPtr, buf);
return TCL_OK;
} else {
return Tcl_BadChannelOption(interp, optionName, "mode");
}
}
#undef DIRECT_BAUD
#ifdef B4800
# if (B4800 == 4800)
# define DIRECT_BAUD
# endif
#endif
#ifdef DIRECT_BAUD
# define TtyGetSpeed(baud) ((unsigned) (baud))
# define TtyGetBaud(speed) ((int) (speed))
#else
static struct {int baud; unsigned long speed;} speeds[] = {
#ifdef B0
{0, B0},
#endif
#ifdef B50
{50, B50},
#endif
#ifdef B75
{75, B75},
#endif
#ifdef B110
{110, B110},
#endif
#ifdef B134
{134, B134},
#endif
#ifdef B150
{150, B150},
#endif
#ifdef B200
{200, B200},
#endif
#ifdef B300
{300, B300},
#endif
#ifdef B600
{600, B600},
#endif
#ifdef B1200
{1200, B1200},
#endif
#ifdef B1800
{1800, B1800},
#endif
#ifdef B2400
{2400, B2400},
#endif
#ifdef B4800
{4800, B4800},
#endif
#ifdef B9600
{9600, B9600},
#endif
#ifdef B14400
{14400, B14400},
#endif
#ifdef B19200
{19200, B19200},
#endif
#ifdef EXTA
{19200, EXTA},
#endif
#ifdef B28800
{28800, B28800},
#endif
#ifdef B38400
{38400, B38400},
#endif
#ifdef EXTB
{38400, EXTB},
#endif
#ifdef B57600
{57600, B57600},
#endif
#ifdef _B57600
{57600, _B57600},
#endif
#ifdef B76800
{76800, B76800},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef _B115200
{115200, _B115200},
#endif
#ifdef B153600
{153600, B153600},
#endif
#ifdef B230400
{230400, B230400},
#endif
#ifdef B307200
{307200, B307200},
#endif
#ifdef B460800
{460800, B460800},
#endif
{-1, 0}
};
/*
*---------------------------------------------------------------------------
*
* TtyGetSpeed --
*
* Given a baud rate, get the mask value that should be stored in
* the termios, termio, or sgttyb structure in order to select that
* baud rate.
*
* Results:
* As above.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static unsigned long
TtyGetSpeed(baud)
int baud; /* The baud rate to look up. */
{
int bestIdx, bestDiff, i, diff;
bestIdx = 0;
bestDiff = 1000000;
/*
* If the baud rate does not correspond to one of the known mask values,
* choose the mask value whose baud rate is closest to the specified
* baud rate.
*/
for (i = 0; speeds[i].baud >= 0; i++) {
diff = speeds[i].baud - baud;
if (diff < 0) {
diff = -diff;
}
if (diff < bestDiff) {
bestIdx = i;
bestDiff = diff;
}
}
return speeds[bestIdx].speed;
}
/*
*---------------------------------------------------------------------------
*
* TtyGetBaud --
*
* Given a speed mask value from a termios, termio, or sgttyb
* structure, get the baus rate that corresponds to that mask value.
*
* Results:
* As above. If the mask value was not recognized, 0 is returned.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static int
TtyGetBaud(speed)
unsigned long speed; /* Speed mask value to look up. */
{
int i;
for (i = 0; speeds[i].baud >= 0; i++) {
if (speeds[i].speed == speed) {
return speeds[i].baud;
}
}
return 0;
}
#endif /* !DIRECT_BAUD */
/*
*---------------------------------------------------------------------------
*
* TtyInit --
*
* Given file descriptor that refers to a serial port,
* initialize the serial port to a set of sane values so that
* Tcl can talk to a device located on the serial port.
*
* Results:
* None.
*
* Side effects:
* Serial device initialized.
*
*---------------------------------------------------------------------------
*/
static void
TtyInit(fd)
int fd; /* Open file descriptor for serial port to
* be initialized. */
{
#ifdef USE_TERMIOS
struct termios termios;
tcgetattr(fd, &termios);
termios.c_iflag = IGNBRK;
termios.c_oflag = 0;
termios.c_lflag = 0;
termios.c_cflag |= CREAD;
termios.c_cc[VMIN] = 60;
termios.c_cc[VTIME] = 2;
tcsetattr(fd, TCSANOW, &termios);
#else /* !USE_TERMIOS */
#ifdef USE_TERMIO
struct termio termio;
ioctl(fd, TCGETA, &termio);
termio.c_iflag = IGNBRK;
termio.c_oflag = 0;
termio.c_lflag = 0;
termio.c_cflag |= CREAD;
termio.c_cc[VMIN] = 60;
termio.c_cc[VTIME] = 2;
ioctl(fd, TCSETAW, &termio);
#else /* !USE_TERMIO */
#ifdef USE_SGTTY
struct sgttyb sgttyb;
ioctl(fd, TIOCGETP, &sgttyb);
sgttyb.sg_flags &= (EVENP | ODDP);
sgttyb.sg_flags |= RAW;
ioctl(fd, TIOCSETP, &sgttyb);
#endif /* USE_SGTTY */
#endif /* !USE_TERMIO */
#endif /* !USE_TERMIOS */
}
/*
*---------------------------------------------------------------------------
*
* TtyGetAttributes --
*
* Get the current attributes of the specified serial device.
*
* Results:
* None.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static void
TtyGetAttributes(fd, ttyPtr)
int fd; /* Open file descriptor for serial port to
* be queried. */
TtyAttrs *ttyPtr; /* Buffer filled with serial port
* attributes. */
{
#ifdef USE_TERMIOS
int parity, data;
struct termios termios;
tcgetattr(fd, &termios);
ttyPtr->baud = TtyGetBaud(cfgetospeed(&termios));
parity = 'n';
#ifdef PAREXT
switch ((int) (termios.c_cflag & (PARENB | PARODD | PAREXT))) {
case PARENB : parity = 'e'; break;
case PARENB | PARODD : parity = 'o'; break;
case PARENB | PAREXT : parity = 's'; break;
case PARENB | PARODD | PAREXT : parity = 'm'; break;
}
#else /* !PAREXT */
switch ((int) (termios.c_cflag & (PARENB | PARODD))) {
case PARENB : parity = 'e'; break;
case PARENB | PARODD : parity = 'o'; break;
}
#endif /* !PAREXT */
ttyPtr->parity = parity;
data = termios.c_cflag & CSIZE;
ttyPtr->data = (data == CS5) ? 5 : (data == CS6) ? 6 :
(data == CS7) ? 7 : 8;
ttyPtr->stop = (termios.c_cflag & CSTOPB) ? 2 : 1;
#else /* !USE_TERMIOS */
#ifdef USE_TERMIO
int parity, data;
struct termio termio;
ioctl(fd, TCGETA, &termio);
ttyPtr->baud = TtyGetBaud(termio.c_cflag & CBAUD);
parity = 'n';
switch (termio.c_cflag & (PARENB | PARODD | PAREXT)) {
case PARENB : parity = 'e'; break;
case PARENB | PARODD : parity = 'o'; break;
case PARENB | PAREXT : parity = 's'; break;
case PARENB | PARODD | PAREXT : parity = 'm'; break;
}
ttyPtr->parity = parity;
data = termio.c_cflag & CSIZE;
ttyPtr->data = (data == CS5) ? 5 : (data == CS6) ? 6 :
(data == CS7) ? 7 : 8;
ttyPtr->stop = (termio.c_cflag & CSTOPB) ? 2 : 1;
#else /* !USE_TERMIO */
#ifdef USE_SGTTY
int parity;
struct sgttyb sgttyb;
ioctl(fd, TIOCGETP, &sgttyb);
ttyPtr->baud = TtyGetBaud(sgttyb.sg_ospeed);
parity = 'n';
if (sgttyb.sg_flags & EVENP) {
parity = 'e';
} else if (sgttyb.sg_flags & ODDP) {
parity = 'o';
}
ttyPtr->parity = parity;
ttyPtr->data = (sgttyb.sg_flags & (EVENP | ODDP)) ? 7 : 8;
ttyPtr->stop = 1;
#else /* !USE_SGTTY */
ttyPtr->baud = 0;
ttyPtr->parity = 'n';
ttyPtr->data = 0;
ttyPtr->stop = 0;
#endif /* !USE_SGTTY */
#endif /* !USE_TERMIO */
#endif /* !USE_TERMIOS */
}
/*
*---------------------------------------------------------------------------
*
* TtySetAttributes --
*
* Set the current attributes of the specified serial device.
*
* Results:
* None.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static void
TtySetAttributes(fd, ttyPtr)
int fd; /* Open file descriptor for serial port to
* be modified. */
TtyAttrs *ttyPtr; /* Buffer containing new attributes for
* serial port. */
{
#ifdef USE_TERMIOS
int parity, data, flag;
struct termios termios;
tcgetattr(fd, &termios);
cfsetospeed(&termios, TtyGetSpeed(ttyPtr->baud));
cfsetispeed(&termios, TtyGetSpeed(ttyPtr->baud));
flag = 0;
parity = ttyPtr->parity;
if (parity != 'n') {
flag |= PARENB;
#ifdef PAREXT
termios.c_cflag &= ~PAREXT;
if ((parity == 'm') || (parity == 's')) {
flag |= PAREXT;
}
#endif
if ((parity == 'm') || (parity == 'o')) {
flag |= PARODD;
}
}
data = ttyPtr->data;
flag |= (data == 5) ? CS5 : (data == 6) ? CS6 : (data == 7) ? CS7 : CS8;
if (ttyPtr->stop == 2) {
flag |= CSTOPB;
}
termios.c_cflag &= ~(PARENB | PARODD | CSIZE | CSTOPB);
termios.c_cflag |= flag;
tcsetattr(fd, TCSANOW, &termios);
#else /* !USE_TERMIOS */
#ifdef USE_TERMIO
int parity, data, flag;
struct termio termio;
ioctl(fd, TCGETA, &termio);
termio.c_cflag &= ~CBAUD;
termio.c_cflag |= TtyGetSpeed(ttyPtr->baud);
flag = 0;
parity = ttyPtr->parity;
if (parity != 'n') {
flag |= PARENB;
if ((parity == 'm') || (parity == 's')) {
flag |= PAREXT;
}
if ((parity == 'm') || (parity == 'o')) {
flag |= PARODD;
}
}
data = ttyPtr->data;
flag |= (data == 5) ? CS5 : (data == 6) ? CS6 : (data == 7) ? CS7 : CS8;
if (ttyPtr->stop == 2) {
flag |= CSTOPB;
}
termio.c_cflag &= ~(PARENB | PARODD | PAREXT | CSIZE | CSTOPB);
termio.c_cflag |= flag;
ioctl(fd, TCSETAW, &termio);
#else /* !USE_TERMIO */
#ifdef USE_SGTTY
int parity;
struct sgttyb sgttyb;
ioctl(fd, TIOCGETP, &sgttyb);
sgttyb.sg_ospeed = TtyGetSpeed(ttyPtr->baud);
sgttyb.sg_ispeed = TtyGetSpeed(ttyPtr->baud);
parity = ttyPtr->parity;
if (parity == 'e') {
sgttyb.sg_flags &= ~ODDP;
sgttyb.sg_flags |= EVENP;
} else if (parity == 'o') {
sgttyb.sg_flags &= ~EVENP;
sgttyb.sg_flags |= ODDP;
}
ioctl(fd, TIOCSETP, &sgttyb);
#endif /* USE_SGTTY */
#endif /* !USE_TERMIO */
#endif /* !USE_TERMIOS */
}
/*
*---------------------------------------------------------------------------
*
* TtyParseMode --
*
* Parse the "-mode" argument to the fconfigure command. The argument
* is of the form baud,parity,data,stop.
*
* Results:
* The return value is TCL_OK if the argument was successfully
* parsed, TCL_ERROR otherwise. If TCL_ERROR is returned, an
* error message is left in interp->result (if interp is non-NULL).
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static int
TtyParseMode(interp, mode, speedPtr, parityPtr, dataPtr, stopPtr)
Tcl_Interp *interp; /* If non-NULL, interp for error return. */
CONST char *mode; /* Mode string to be parsed. */
int *speedPtr; /* Filled with baud rate from mode string. */
int *parityPtr; /* Filled with parity from mode string. */
int *dataPtr; /* Filled with data bits from mode string. */
int *stopPtr; /* Filled with stop bits from mode string. */
{
int i, end;
char parity;
static char *bad = "bad value for -mode";
i = sscanf(mode, "%d,%c,%d,%d%n", speedPtr, &parity, dataPtr,
stopPtr, &end);
if ((i != 4) || (mode[end] != '\0')) {
if (interp != NULL) {
Tcl_AppendResult(interp, bad, ": should be baud,parity,data,stop",
NULL);
}
return TCL_ERROR;
}
if (strchr("noems", parity) == NULL) {
if (interp != NULL) {
Tcl_AppendResult(interp, bad,
" parity: should be n, o, e, m, or s", NULL);
}
return TCL_ERROR;
}
*parityPtr = parity;
if ((*dataPtr < 5) || (*dataPtr > 8)) {
if (interp != NULL) {
Tcl_AppendResult(interp, bad, " data: should be 5, 6, 7, or 8",
NULL);
}
return TCL_ERROR;
}
if ((*stopPtr < 0) || (*stopPtr > 2)) {
if (interp != NULL) {
Tcl_AppendResult(interp, bad, " stop: should be 1 or 2", NULL);
}
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenFileChannel --
*
* Open an file based channel on Unix systems.
*
* Results:
* The new channel or NULL. If NULL, the output argument
* errorCodePtr is set to a POSIX error and an error message is
* left in interp->result if interp is not NULL.
*
* Side effects:
* May open the channel and may cause creation of a file on the
* file system.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_OpenFileChannel(interp, fileName, modeString, permissions)
Tcl_Interp *interp; /* Interpreter for error reporting;
* can be NULL. */
char *fileName; /* Name of file to open. */
char *modeString; /* A list of POSIX open modes or
* a string such as "rw". */
int permissions; /* If the open involves creating a
* file, with what modes to create
* it? */
{
int fd, seekFlag, mode, channelPermissions;
FileState *fsPtr;
char *nativeName, channelName[20];
Tcl_DString buffer;
Tcl_ChannelType *channelTypePtr;
mode = TclGetOpenMode(interp, modeString, &seekFlag);
if (mode == -1) {
return NULL;
}
switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
case O_RDONLY:
channelPermissions = TCL_READABLE;
break;
case O_WRONLY:
channelPermissions = TCL_WRITABLE;
break;
case O_RDWR:
channelPermissions = (TCL_READABLE | TCL_WRITABLE);
break;
default:
/*
* This may occurr if modeString was "", for example.
*/
panic("Tcl_OpenFileChannel: invalid mode value");
return NULL;
}
nativeName = Tcl_TranslateFileName(interp, fileName, &buffer);
if (nativeName == NULL) {
return NULL;
}
fd = open(nativeName, mode, permissions);
/*
* If nativeName is not NULL, the buffer is valid and we must free
* the storage.
*/
Tcl_DStringFree(&buffer);
if (fd < 0) {
if (interp != (Tcl_Interp *) NULL) {
Tcl_AppendResult(interp, "couldn't open \"", fileName, "\": ",
Tcl_PosixError(interp), (char *) NULL);
}
return NULL;
}
/*
* Set close-on-exec flag on the fd so that child processes will not
* inherit this fd.
*/
fcntl(fd, F_SETFD, FD_CLOEXEC);
sprintf(channelName, "file%d", fd);
fsPtr = (FileState *) ckalloc((unsigned) sizeof(FileState));
fsPtr->nextPtr = firstFilePtr;
firstFilePtr = fsPtr;
fsPtr->validMask = channelPermissions | TCL_EXCEPTION;
fsPtr->fd = fd;
if (isatty(fd)) {
/*
* Initialize the serial port to a set of sane parameters.
* Especially important if the remote device is set to echo and
* the serial port driver was also set to echo -- as soon as a char
* were sent to the serial port, the remote device would echo it,
* then the serial driver would echo it back to the device, etc.
*/
TtyInit(fd);
channelTypePtr = &ttyChannelType;
} else {
channelTypePtr = &fileChannelType;
}
fsPtr->channel = Tcl_CreateChannel(channelTypePtr, channelName,
(ClientData) fsPtr, channelPermissions);
if (seekFlag) {
if (Tcl_Seek(fsPtr->channel, 0, SEEK_END) < 0) {
if (interp != (Tcl_Interp *) NULL) {
Tcl_AppendResult(interp, "couldn't seek to end of file on \"",
channelName, "\": ", Tcl_PosixError(interp), NULL);
}
Tcl_Close(NULL, fsPtr->channel);
return NULL;
}
}
if (channelTypePtr == &ttyChannelType) {
/*
* Gotcha. Most modems need a "\r" at the end of the command
* sequence. If you just send "at\n", the modem will not respond
* with "OK" because it never got a "\r" to actually invoke the
* command. So, by default, newlines are translated to "\r\n" on
* output to avoid "bug" reports that the serial port isn't working.
*/
if (Tcl_SetChannelOption(interp, fsPtr->channel, "-translation",
"auto crlf") != TCL_OK) {
Tcl_Close(NULL, fsPtr->channel);
return NULL;
}
}
return fsPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_MakeFileChannel --
*
* Makes a Tcl_Channel from an existing OS level file handle.
*
* Results:
* The Tcl_Channel created around the preexisting OS level file handle.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_MakeFileChannel(handle, mode)
ClientData handle; /* OS level handle. */
int mode; /* ORed combination of TCL_READABLE and
* TCL_WRITABLE to indicate file mode. */
{
FileState *fsPtr;
char channelName[20];
int fd = (int) handle;
if (mode == 0) {
return NULL;
}
sprintf(channelName, "file%d", fd);
/*
* Look to see if a channel with this fd and the same mode already exists.
* If the fd is used, but the mode doesn't match, return NULL.
*/
for (fsPtr = firstFilePtr; fsPtr != NULL; fsPtr = fsPtr->nextPtr) {
if (fsPtr->fd == fd) {
return (mode == fsPtr->validMask) ? fsPtr->channel : NULL;
}
}
fsPtr = (FileState *) ckalloc((unsigned) sizeof(FileState));
fsPtr->nextPtr = firstFilePtr;
firstFilePtr = fsPtr;
fsPtr->fd = fd;
fsPtr->validMask = mode | TCL_EXCEPTION;
fsPtr->channel = Tcl_CreateChannel(&fileChannelType, channelName,
(ClientData) fsPtr, mode);
return fsPtr->channel;
}
/*
*----------------------------------------------------------------------
*
* TcpBlockModeProc --
*
* This procedure is invoked by the generic IO level to set blocking
* and nonblocking mode on a TCP socket based channel.
*
* Results:
* 0 if successful, errno when failed.
*
* Side effects:
* Sets the device into blocking or nonblocking mode.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
TcpBlockModeProc(instanceData, mode)
ClientData instanceData; /* Socket state. */
int mode; /* The mode to set. Can be one of
* TCL_MODE_BLOCKING or
* TCL_MODE_NONBLOCKING. */
{
TcpState *statePtr = (TcpState *) instanceData;
int setting;
#ifndef USE_FIONBIO
setting = fcntl(statePtr->fd, F_GETFL);
if (mode == TCL_MODE_BLOCKING) {
statePtr->flags &= (~(TCP_ASYNC_SOCKET));
setting &= (~(O_NONBLOCK));
} else {
statePtr->flags |= TCP_ASYNC_SOCKET;
setting |= O_NONBLOCK;
}
if (fcntl(statePtr->fd, F_SETFL, setting) < 0) {
return errno;
}
#endif
#ifdef USE_FIONBIO
if (mode == TCL_MODE_BLOCKING) {
statePtr->flags &= (~(TCP_ASYNC_SOCKET));
setting = 0;
if (ioctl(statePtr->fd, (int) FIONBIO, &setting) == -1) {
return errno;
}
} else {
statePtr->flags |= TCP_ASYNC_SOCKET;
setting = 1;
if (ioctl(statePtr->fd, (int) FIONBIO, &setting) == -1) {
return errno;
}
}
#endif
return 0;
}
/*
*----------------------------------------------------------------------
*
* WaitForConnect --
*
* Waits for a connection on an asynchronously opened socket to
* be completed.
*
* Results:
* None.
*
* Side effects:
* The socket is connected after this function returns.
*
*----------------------------------------------------------------------
*/
static int
WaitForConnect(statePtr, errorCodePtr)
TcpState *statePtr; /* State of the socket. */
int *errorCodePtr; /* Where to store errors? */
{
int timeOut; /* How long to wait. */
int state; /* Of calling TclWaitForFile. */
int flags; /* fcntl flags for the socket. */
/*
* If an asynchronous connect is in progress, attempt to wait for it
* to complete before reading.
*/
if (statePtr->flags & TCP_ASYNC_CONNECT) {
if (statePtr->flags & TCP_ASYNC_SOCKET) {
timeOut = 0;
} else {
timeOut = -1;
}
errno = 0;
state = TclUnixWaitForFile(statePtr->fd,
TCL_WRITABLE | TCL_EXCEPTION, timeOut);
if (!(statePtr->flags & TCP_ASYNC_SOCKET)) {
#ifndef USE_FIONBIO
flags = fcntl(statePtr->fd, F_GETFL);
flags &= (~(O_NONBLOCK));
(void) fcntl(statePtr->fd, F_SETFL, flags);
#endif
#ifdef USE_FIONBIO
flags = 0;
(void) ioctl(statePtr->fd, FIONBIO, &flags);
#endif
}
if (state & TCL_EXCEPTION) {
return -1;
}
if (state & TCL_WRITABLE) {
statePtr->flags &= (~(TCP_ASYNC_CONNECT));
} else if (timeOut == 0) {
*errorCodePtr = errno = EWOULDBLOCK;
return -1;
}
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* TcpInputProc --
*
* This procedure is invoked by the generic IO level to read input
* from a TCP socket based channel.
*
* NOTE: We cannot share code with FilePipeInputProc because here
* we must use recv to obtain the input from the channel, not read.
*
* Results:
* The number of bytes read is returned or -1 on error. An output
* argument contains the POSIX error code on error, or zero if no
* error occurred.
*
* Side effects:
* Reads input from the input device of the channel.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
TcpInputProc(instanceData, buf, bufSize, errorCodePtr)
ClientData instanceData; /* Socket state. */
char *buf; /* Where to store data read. */
int bufSize; /* How much space is available
* in the buffer? */
int *errorCodePtr; /* Where to store error code. */
{
TcpState *statePtr = (TcpState *) instanceData;
int bytesRead, state;
*errorCodePtr = 0;
state = WaitForConnect(statePtr, errorCodePtr);
if (state != 0) {
return -1;
}
bytesRead = recv(statePtr->fd, buf, bufSize, 0);
if (bytesRead > -1) {
return bytesRead;
}
if (errno == ECONNRESET) {
/*
* Turn ECONNRESET into a soft EOF condition.
*/
return 0;
}
*errorCodePtr = errno;
return -1;
}
/*
*----------------------------------------------------------------------
*
* TcpOutputProc --
*
* This procedure is invoked by the generic IO level to write output
* to a TCP socket based channel.
*
* NOTE: We cannot share code with FilePipeOutputProc because here
* we must use send, not write, to get reliable error reporting.
*
* Results:
* The number of bytes written is returned. An output argument is
* set to a POSIX error code if an error occurred, or zero.
*
* Side effects:
* Writes output on the output device of the channel.
*
*----------------------------------------------------------------------
*/
static int
TcpOutputProc(instanceData, buf, toWrite, errorCodePtr)
ClientData instanceData; /* Socket state. */
char *buf; /* The data buffer. */
int toWrite; /* How many bytes to write? */
int *errorCodePtr; /* Where to store error code. */
{
TcpState *statePtr = (TcpState *) instanceData;
int written;
int state; /* Of waiting for connection. */
*errorCodePtr = 0;
state = WaitForConnect(statePtr, errorCodePtr);
if (state != 0) {
return -1;
}
written = send(statePtr->fd, buf, toWrite, 0);
if (written > -1) {
return written;
}
*errorCodePtr = errno;
return -1;
}
/*
*----------------------------------------------------------------------
*
* TcpCloseProc --
*
* This procedure is invoked by the generic IO level to perform
* channel-type-specific cleanup when a TCP socket based channel
* is closed.
*
* Results:
* 0 if successful, the value of errno if failed.
*
* Side effects:
* Closes the socket of the channel.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
TcpCloseProc(instanceData, interp)
ClientData instanceData; /* The socket to close. */
Tcl_Interp *interp; /* For error reporting - unused. */
{
TcpState *statePtr = (TcpState *) instanceData;
int errorCode = 0;
/*
* Delete a file handler that may be active for this socket if this
* is a server socket - the file handler was created automatically
* by Tcl as part of the mechanism to accept new client connections.
* Channel handlers are already deleted in the generic IO channel
* closing code that called this function, so we do not have to
* delete them here.
*/
Tcl_DeleteFileHandler(statePtr->fd);
if (close(statePtr->fd) < 0) {
errorCode = errno;
}
ckfree((char *) statePtr);
return errorCode;
}
/*
*----------------------------------------------------------------------
*
* TcpGetOptionProc --
*
* Computes an option value for a TCP socket based channel, or a
* list of all options and their values.
*
* Note: This code is based on code contributed by John Haxby.
*
* Results:
* A standard Tcl result. The value of the specified option or a
* list of all options and their values is returned in the
* supplied DString. Sets Error message if needed.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
TcpGetOptionProc(instanceData, interp, optionName, dsPtr)
ClientData instanceData; /* Socket state. */
Tcl_Interp *interp; /* For error reporting - can be NULL. */
char *optionName; /* Name of the option to
* retrieve the value for, or
* NULL to get all options and
* their values. */
Tcl_DString *dsPtr; /* Where to store the computed
* value; initialized by caller. */
{
TcpState *statePtr = (TcpState *) instanceData;
struct sockaddr_in sockname;
struct sockaddr_in peername;
struct hostent *hostEntPtr;
int size = sizeof(struct sockaddr_in);
size_t len = 0;
char buf[128];
if (optionName != (char *) NULL) {
len = strlen(optionName);
}
if ((len == 0) ||
((len > 1) && (optionName[1] == 'p') &&
(strncmp(optionName, "-peername", len) == 0))) {
if (getpeername(statePtr->fd, (struct sockaddr *) &peername, &size)
>= 0) {
if (len == 0) {
Tcl_DStringAppendElement(dsPtr, "-peername");
Tcl_DStringStartSublist(dsPtr);
}
Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr));
hostEntPtr = gethostbyaddr((char *) &(peername.sin_addr),
sizeof(peername.sin_addr), AF_INET);
if (hostEntPtr != (struct hostent *) NULL) {
Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name);
} else {
Tcl_DStringAppendElement(dsPtr, inet_ntoa(peername.sin_addr));
}
sprintf(buf, "%d", ntohs(peername.sin_port));
Tcl_DStringAppendElement(dsPtr, buf);
if (len == 0) {
Tcl_DStringEndSublist(dsPtr);
} else {
return TCL_OK;
}
} else {
/*
* getpeername failed - but if we were asked for all the options
* (len==0), don't flag an error at that point because it could
* be an fconfigure request on a server socket. (which have
* no peer). same must be done on win&mac.
*/
if (len) {
if (interp) {
Tcl_AppendResult(interp, "can't get peername: ",
Tcl_PosixError(interp),
(char *) NULL);
}
return TCL_ERROR;
}
}
}
if ((len == 0) ||
((len > 1) && (optionName[1] == 's') &&
(strncmp(optionName, "-sockname", len) == 0))) {
if (getsockname(statePtr->fd, (struct sockaddr *) &sockname, &size)
>= 0) {
if (len == 0) {
Tcl_DStringAppendElement(dsPtr, "-sockname");
Tcl_DStringStartSublist(dsPtr);
}
Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr));
hostEntPtr = gethostbyaddr((char *) &(sockname.sin_addr),
sizeof(sockname.sin_addr), AF_INET);
if (hostEntPtr != (struct hostent *) NULL) {
Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name);
} else {
Tcl_DStringAppendElement(dsPtr, inet_ntoa(sockname.sin_addr));
}
sprintf(buf, "%d", ntohs(sockname.sin_port));
Tcl_DStringAppendElement(dsPtr, buf);
if (len == 0) {
Tcl_DStringEndSublist(dsPtr);
} else {
return TCL_OK;
}
} else {
if (interp) {
Tcl_AppendResult(interp, "can't get sockname: ",
Tcl_PosixError(interp),
(char *) NULL);
}
return TCL_ERROR;
}
}
if (len > 0) {
return Tcl_BadChannelOption(interp, optionName, "peername sockname");
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TcpWatchProc --
*
* Initialize the notifier to watch the fd from this channel.
*
* Results:
* None.
*
* Side effects:
* Sets up the notifier so that a future event on the channel will
* be seen by Tcl.
*
*----------------------------------------------------------------------
*/
static void
TcpWatchProc(instanceData, mask)
ClientData instanceData; /* The socket state. */
int mask; /* Events of interest; an OR-ed
* combination of TCL_READABLE,
* TCL_WRITABLE and TCL_EXCEPTION. */
{
TcpState *statePtr = (TcpState *) instanceData;
if (mask) {
Tcl_CreateFileHandler(statePtr->fd, mask,
(Tcl_FileProc *) Tcl_NotifyChannel,
(ClientData) statePtr->channel);
} else {
Tcl_DeleteFileHandler(statePtr->fd);
}
}
/*
*----------------------------------------------------------------------
*
* TcpGetHandleProc --
*
* Called from Tcl_GetChannelFile to retrieve OS handles from inside
* a TCP socket based channel.
*
* Results:
* Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if
* there is no handle for the specified direction.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static int
TcpGetHandleProc(instanceData, direction, handlePtr)
ClientData instanceData; /* The socket state. */
int direction; /* Not used. */
ClientData *handlePtr; /* Where to store the handle. */
{
TcpState *statePtr = (TcpState *) instanceData;
*handlePtr = (ClientData)statePtr->fd;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* CreateSocket --
*
* This function opens a new socket in client or server mode
* and initializes the TcpState structure.
*
* Results:
* Returns a new TcpState, or NULL with an error in interp->result,
* if interp is not NULL.
*
* Side effects:
* Opens a socket.
*
*----------------------------------------------------------------------
*/
static TcpState *
CreateSocket(interp, port, host, server, myaddr, myport, async)
Tcl_Interp *interp; /* For error reporting; can be NULL. */
int port; /* Port number to open. */
char *host; /* Name of host on which to open port.
* NULL implies INADDR_ANY */
int server; /* 1 if socket should be a server socket,
* else 0 for a client socket. */
char *myaddr; /* Optional client-side address */
int myport; /* Optional client-side port */
int async; /* If nonzero and creating a client socket,
* attempt to do an async connect. Otherwise
* do a synchronous connect or bind. */
{
int status, sock, asyncConnect, curState, origState;
struct sockaddr_in sockaddr; /* socket address */
struct sockaddr_in mysockaddr; /* Socket address for client */
TcpState *statePtr;
sock = -1;
origState = 0;
if (! CreateSocketAddress(&sockaddr, host, port)) {
goto addressError;
}
if ((myaddr != NULL || myport != 0) &&
! CreateSocketAddress(&mysockaddr, myaddr, myport)) {
goto addressError;
}
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
goto addressError;
}
/*
* Set the close-on-exec flag so that the socket will not get
* inherited by child processes.
*/
fcntl(sock, F_SETFD, FD_CLOEXEC);
/*
* Set kernel space buffering
*/
TclSockMinimumBuffers(sock, SOCKET_BUFSIZE);
asyncConnect = 0;
status = 0;
if (server) {
/*
* Set up to reuse server addresses automatically and bind to the
* specified port.
*/
status = 1;
(void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &status,
sizeof(status));
status = bind(sock, (struct sockaddr *) &sockaddr,
sizeof(struct sockaddr));
if (status != -1) {
status = listen(sock, SOMAXCONN);
}
} else {
if (myaddr != NULL || myport != 0) {
curState = 1;
(void) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
(char *) &curState, sizeof(curState));
status = bind(sock, (struct sockaddr *) &mysockaddr,
sizeof(struct sockaddr));
if (status < 0) {
goto bindError;
}
}
/*
* Attempt to connect. The connect may fail at present with an
* EINPROGRESS but at a later time it will complete. The caller
* will set up a file handler on the socket if she is interested in
* being informed when the connect completes.
*/
if (async) {
#ifndef USE_FIONBIO
origState = fcntl(sock, F_GETFL);
curState = origState | O_NONBLOCK;
status = fcntl(sock, F_SETFL, curState);
#endif
#ifdef USE_FIONBIO
curState = 1;
status = ioctl(sock, FIONBIO, &curState);
#endif
} else {
status = 0;
}
if (status > -1) {
status = connect(sock, (struct sockaddr *) &sockaddr,
sizeof(sockaddr));
if (status < 0) {
if (errno == EINPROGRESS) {
asyncConnect = 1;
status = 0;
}
}
}
}
bindError:
if (status < 0) {
if (interp != NULL) {
Tcl_AppendResult(interp, "couldn't open socket: ",
Tcl_PosixError(interp), (char *) NULL);
}
if (sock != -1) {
close(sock);
}
return NULL;
}
/*
* Allocate a new TcpState for this socket.
*/
statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState));
statePtr->flags = 0;
if (asyncConnect) {
statePtr->flags = TCP_ASYNC_CONNECT;
}
statePtr->fd = sock;
return statePtr;
addressError:
if (sock != -1) {
close(sock);
}
if (interp != NULL) {
Tcl_AppendResult(interp, "couldn't open socket: ",
Tcl_PosixError(interp), (char *) NULL);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* CreateSocketAddress --
*
* This function initializes a sockaddr structure for a host and port.
*
* Results:
* 1 if the host was valid, 0 if the host could not be converted to
* an IP address.
*
* Side effects:
* Fills in the *sockaddrPtr structure.
*
*----------------------------------------------------------------------
*/
static int
CreateSocketAddress(sockaddrPtr, host, port)
struct sockaddr_in *sockaddrPtr; /* Socket address */
char *host; /* Host. NULL implies INADDR_ANY */
int port; /* Port number */
{
struct hostent *hostent; /* Host database entry */
struct in_addr addr; /* For 64/32 bit madness */
(void) memset((VOID *) sockaddrPtr, '\0', sizeof(struct sockaddr_in));
sockaddrPtr->sin_family = AF_INET;
sockaddrPtr->sin_port = htons((unsigned short) (port & 0xFFFF));
if (host == NULL) {
addr.s_addr = INADDR_ANY;
} else {
addr.s_addr = inet_addr(host);
if (addr.s_addr == -1) {
hostent = gethostbyname(host);
if (hostent != NULL) {
memcpy((VOID *) &addr,
(VOID *) hostent->h_addr_list[0],
(size_t) hostent->h_length);
} else {
#ifdef EHOSTUNREACH
errno = EHOSTUNREACH;
#else
#ifdef ENXIO
errno = ENXIO;
#endif
#endif
return 0; /* error */
}
}
}
/*
* NOTE: On 64 bit machines the assignment below is rumored to not
* do the right thing. Please report errors related to this if you
* observe incorrect behavior on 64 bit machines such as DEC Alphas.
* Should we modify this code to do an explicit memcpy?
*/
sockaddrPtr->sin_addr.s_addr = addr.s_addr;
return 1; /* Success. */
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenTcpClient --
*
* Opens a TCP client socket and creates a channel around it.
*
* Results:
* The channel or NULL if failed. An error message is returned
* in the interpreter on failure.
*
* Side effects:
* Opens a client socket and creates a new channel.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async)
Tcl_Interp *interp; /* For error reporting; can be NULL. */
int port; /* Port number to open. */
char *host; /* Host on which to open port. */
char *myaddr; /* Client-side address */
int myport; /* Client-side port */
int async; /* If nonzero, attempt to do an
* asynchronous connect. Otherwise
* we do a blocking connect. */
{
TcpState *statePtr;
char channelName[20];
/*
* Create a new client socket and wrap it in a channel.
*/
statePtr = CreateSocket(interp, port, host, 0, myaddr, myport, async);
if (statePtr == NULL) {
return NULL;
}
statePtr->acceptProc = NULL;
statePtr->acceptProcData = (ClientData) NULL;
sprintf(channelName, "sock%d", statePtr->fd);
statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE));
if (Tcl_SetChannelOption(interp, statePtr->channel, "-translation",
"auto crlf") == TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, statePtr->channel);
return NULL;
}
return statePtr->channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_MakeTcpClientChannel --
*
* Creates a Tcl_Channel from an existing client TCP socket.
*
* Results:
* The Tcl_Channel wrapped around the preexisting TCP socket.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_MakeTcpClientChannel(sock)
ClientData sock; /* The socket to wrap up into a channel. */
{
TcpState *statePtr;
char channelName[20];
statePtr = (TcpState *) ckalloc((unsigned) sizeof(TcpState));
statePtr->fd = (int) sock;
statePtr->acceptProc = NULL;
statePtr->acceptProcData = (ClientData) NULL;
sprintf(channelName, "sock%d", statePtr->fd);
statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE));
if (Tcl_SetChannelOption((Tcl_Interp *) NULL, statePtr->channel,
"-translation", "auto crlf") == TCL_ERROR) {
Tcl_Close((Tcl_Interp *) NULL, statePtr->channel);
return NULL;
}
return statePtr->channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_OpenTcpServer --
*
* Opens a TCP server socket and creates a channel around it.
*
* Results:
* The channel or NULL if failed. If an error occurred, an
* error message is left in interp->result if interp is
* not NULL.
*
* Side effects:
* Opens a server socket and creates a new channel.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
Tcl_OpenTcpServer(interp, port, myHost, acceptProc, acceptProcData)
Tcl_Interp *interp; /* For error reporting - may be
* NULL. */
int port; /* Port number to open. */
char *myHost; /* Name of local host. */
Tcl_TcpAcceptProc *acceptProc; /* Callback for accepting connections
* from new clients. */
ClientData acceptProcData; /* Data for the callback. */
{
TcpState *statePtr;
char channelName[20];
/*
* Create a new client socket and wrap it in a channel.
*/
statePtr = CreateSocket(interp, port, myHost, 1, NULL, 0, 0);
if (statePtr == NULL) {
return NULL;
}
statePtr->acceptProc = acceptProc;
statePtr->acceptProcData = acceptProcData;
/*
* Set up the callback mechanism for accepting connections
* from new clients.
*/
Tcl_CreateFileHandler(statePtr->fd, TCL_READABLE, TcpAccept,
(ClientData) statePtr);
sprintf(channelName, "sock%d", statePtr->fd);
statePtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) statePtr, 0);
return statePtr->channel;
}
/*
*----------------------------------------------------------------------
*
* TcpAccept --
* Accept a TCP socket connection. This is called by the event loop.
*
* Results:
* None.
*
* Side effects:
* Creates a new connection socket. Calls the registered callback
* for the connection acceptance mechanism.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static void
TcpAccept(data, mask)
ClientData data; /* Callback token. */
int mask; /* Not used. */
{
TcpState *sockState; /* Client data of server socket. */
int newsock; /* The new client socket */
TcpState *newSockState; /* State for new socket. */
struct sockaddr_in addr; /* The remote address */
int len; /* For accept interface */
char channelName[20];
sockState = (TcpState *) data;
len = sizeof(struct sockaddr_in);
newsock = accept(sockState->fd, (struct sockaddr *)&addr, &len);
if (newsock < 0) {
return;
}
/*
* Set close-on-exec flag to prevent the newly accepted socket from
* being inherited by child processes.
*/
(void) fcntl(newsock, F_SETFD, FD_CLOEXEC);
newSockState = (TcpState *) ckalloc((unsigned) sizeof(TcpState));
newSockState->flags = 0;
newSockState->fd = newsock;
newSockState->acceptProc = (Tcl_TcpAcceptProc *) NULL;
newSockState->acceptProcData = (ClientData) NULL;
sprintf(channelName, "sock%d", newsock);
newSockState->channel = Tcl_CreateChannel(&tcpChannelType, channelName,
(ClientData) newSockState, (TCL_READABLE | TCL_WRITABLE));
Tcl_SetChannelOption((Tcl_Interp *) NULL, newSockState->channel,
"-translation", "auto crlf");
if (sockState->acceptProc != (Tcl_TcpAcceptProc *) NULL) {
(sockState->acceptProc) (sockState->acceptProcData,
newSockState->channel, inet_ntoa(addr.sin_addr),
ntohs(addr.sin_port));
}
}
/*
*----------------------------------------------------------------------
*
* TclGetDefaultStdChannel --
*
* Creates channels for standard input, standard output or standard
* error output if they do not already exist.
*
* Results:
* Returns the specified default standard channel, or NULL.
*
* Side effects:
* May cause the creation of a standard channel and the underlying
* file.
*
*----------------------------------------------------------------------
*/
Tcl_Channel
TclGetDefaultStdChannel(type)
int type; /* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR. */
{
Tcl_Channel channel = NULL;
int fd = 0; /* Initializations needed to prevent */
int mode = 0; /* compiler warning (used before set). */
char *bufMode = NULL;
switch (type) {
case TCL_STDIN:
if ((lseek(0, (off_t) 0, SEEK_CUR) == -1) &&
(errno == EBADF)) {
return (Tcl_Channel) NULL;
}
fd = 0;
mode = TCL_READABLE;
bufMode = "line";
break;
case TCL_STDOUT:
if ((lseek(1, (off_t) 0, SEEK_CUR) == -1) &&
(errno == EBADF)) {
return (Tcl_Channel) NULL;
}
fd = 1;
mode = TCL_WRITABLE;
bufMode = "line";
break;
case TCL_STDERR:
if ((lseek(2, (off_t) 0, SEEK_CUR) == -1) &&
(errno == EBADF)) {
return (Tcl_Channel) NULL;
}
fd = 2;
mode = TCL_WRITABLE;
bufMode = "none";
break;
default:
panic("TclGetDefaultStdChannel: Unexpected channel type");
break;
}
channel = Tcl_MakeFileChannel((ClientData) fd, mode);
/*
* Set up the normal channel options for stdio handles.
*/
Tcl_SetChannelOption(NULL, channel, "-translation", "auto");
Tcl_SetChannelOption(NULL, channel, "-buffering", bufMode);
return channel;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetOpenFile --
*
* Given a name of a channel registered in the given interpreter,
* returns a FILE * for it.
*
* Results:
* A standard Tcl result. If the channel is registered in the given
* interpreter and it is managed by the "file" channel driver, and
* it is open for the requested mode, then the output parameter
* filePtr is set to a FILE * for the underlying file. On error, the
* filePtr is not set, TCL_ERROR is returned and an error message is
* left in interp->result.
*
* Side effects:
* May invoke fdopen to create the FILE * for the requested file.
*
*----------------------------------------------------------------------
*/
int
Tcl_GetOpenFile(interp, string, forWriting, checkUsage, filePtr)
Tcl_Interp *interp; /* Interpreter in which to find file. */
char *string; /* String that identifies file. */
int forWriting; /* 1 means the file is going to be used
* for writing, 0 means for reading. */
int checkUsage; /* 1 means verify that the file was opened
* in a mode that allows the access specified
* by "forWriting". Ignored, we always
* check that the channel is open for the
* requested mode. */
ClientData *filePtr; /* Store pointer to FILE structure here. */
{
Tcl_Channel chan;
int chanMode;
Tcl_ChannelType *chanTypePtr;
ClientData data;
int fd;
FILE *f;
chan = Tcl_GetChannel(interp, string, &chanMode);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
if ((forWriting) && ((chanMode & TCL_WRITABLE) == 0)) {
Tcl_AppendResult(interp,
"\"", string, "\" wasn't opened for writing", (char *) NULL);
return TCL_ERROR;
} else if ((!(forWriting)) && ((chanMode & TCL_READABLE) == 0)) {
Tcl_AppendResult(interp,
"\"", string, "\" wasn't opened for reading", (char *) NULL);
return TCL_ERROR;
}
/*
* We allow creating a FILE * out of file based, pipe based and socket
* based channels. We currently do not allow any other channel types,
* because it is likely that stdio will not know what to do with them.
*/
chanTypePtr = Tcl_GetChannelType(chan);
if ((chanTypePtr == &fileChannelType) || (chanTypePtr == &tcpChannelType)
|| (strcmp(chanTypePtr->typeName, "pipe") == 0)) {
if (Tcl_GetChannelHandle(chan,
(forWriting ? TCL_WRITABLE : TCL_READABLE),
(ClientData*) &data) == TCL_OK) {
fd = (int) data;
/*
* The call to fdopen below is probably dangerous, since it will
* truncate an existing file if the file is being opened
* for writing....
*/
f = fdopen(fd, (forWriting ? "w" : "r"));
if (f == NULL) {
Tcl_AppendResult(interp, "cannot get a FILE * for \"", string,
"\"", (char *) NULL);
return TCL_ERROR;
}
*filePtr = (ClientData) f;
return TCL_OK;
}
}
Tcl_AppendResult(interp, "\"", string,
"\" cannot be used to get a FILE *", (char *) NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* TclUnixWaitForFile --
*
* This procedure waits synchronously for a file to become readable
* or writable, with an optional timeout.
*
* Results:
* The return value is an OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, and TCL_EXCEPTION, indicating the conditions
* that are present on file at the time of the return. This
* procedure will not return until either "timeout" milliseconds
* have elapsed or at least one of the conditions given by mask
* has occurred for file (a return value of 0 means that a timeout
* occurred). No normal events will be serviced during the
* execution of this procedure.
*
* Side effects:
* Time passes.
*
*----------------------------------------------------------------------
*/
int
TclUnixWaitForFile(fd, mask, timeout)
int fd; /* Handle for file on which to wait. */
int mask; /* What to wait for: OR'ed combination of
* TCL_READABLE, TCL_WRITABLE, and
* TCL_EXCEPTION. */
int timeout; /* Maximum amount of time to wait for one
* of the conditions in mask to occur, in
* milliseconds. A value of 0 means don't
* wait at all, and a value of -1 means
* wait forever. */
{
Tcl_Time abortTime, now;
struct timeval blockTime, *timeoutPtr;
int index, bit, numFound, result = 0;
static fd_mask readyMasks[3*MASK_SIZE];
/* This array reflects the readable/writable
* conditions that were found to exist by the
* last call to select. */
/*
* If there is a non-zero finite timeout, compute the time when
* we give up.
*/
if (timeout > 0) {
TclpGetTime(&now);
abortTime.sec = now.sec + timeout/1000;
abortTime.usec = now.usec + (timeout%1000)*1000;
if (abortTime.usec >= 1000000) {
abortTime.usec -= 1000000;
abortTime.sec += 1;
}
timeoutPtr = &blockTime;
} else if (timeout == 0) {
timeoutPtr = &blockTime;
blockTime.tv_sec = 0;
blockTime.tv_usec = 0;
} else {
timeoutPtr = NULL;
}
/*
* Initialize the ready masks and compute the mask offsets.
*/
if (fd >= FD_SETSIZE) {
panic("TclWaitForFile can't handle file id %d", fd);
}
memset((VOID *) readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));
index = fd/(NBBY*sizeof(fd_mask));
bit = 1 << (fd%(NBBY*sizeof(fd_mask)));
/*
* Loop in a mini-event loop of our own, waiting for either the
* file to become ready or a timeout to occur.
*/
while (1) {
if (timeout > 0) {
blockTime.tv_sec = abortTime.sec - now.sec;
blockTime.tv_usec = abortTime.usec - now.usec;
if (blockTime.tv_usec < 0) {
blockTime.tv_sec -= 1;
blockTime.tv_usec += 1000000;
}
if (blockTime.tv_sec < 0) {
blockTime.tv_sec = 0;
blockTime.tv_usec = 0;
}
}
/*
* Set the appropriate bit in the ready masks for the fd.
*/
if (mask & TCL_READABLE) {
readyMasks[index] |= bit;
}
if (mask & TCL_WRITABLE) {
(readyMasks+MASK_SIZE)[index] |= bit;
}
if (mask & TCL_EXCEPTION) {
(readyMasks+2*(MASK_SIZE))[index] |= bit;
}
/*
* Wait for the event or a timeout.
*/
numFound = select(fd+1, (SELECT_MASK *) &readyMasks[0],
(SELECT_MASK *) &readyMasks[MASK_SIZE],
(SELECT_MASK *) &readyMasks[2*MASK_SIZE], timeoutPtr);
if (numFound == 1) {
if (readyMasks[index] & bit) {
result |= TCL_READABLE;
}
if ((readyMasks+MASK_SIZE)[index] & bit) {
result |= TCL_WRITABLE;
}
if ((readyMasks+2*(MASK_SIZE))[index] & bit) {
result |= TCL_EXCEPTION;
}
result &= mask;
if (result) {
break;
}
}
if (timeout == 0) {
break;
}
/*
* The select returned early, so we need to recompute the timeout.
*/
TclpGetTime(&now);
if ((abortTime.sec < now.sec)
|| ((abortTime.sec == now.sec)
&& (abortTime.usec <= now.usec))) {
break;
}
}
return result;
}
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