freebsd-dev/gnu/libexec/uucp/libunix/pipe.c
1997-02-22 15:28:58 +00:00

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/* pipe.c
The pipe port communication routines for Unix.
Contributed by Marc Boucher <marc@CAM.ORG>.
Copyright (C) 1993 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
*/
#include "uucp.h"
#if USE_RCS_ID
const char pipe_rcsid[] = "$Id$";
#endif
#include "uudefs.h"
#include "uuconf.h"
#include "system.h"
#include "conn.h"
#include "sysdep.h"
#include <errno.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#else
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#endif
/* Local functions. */
static void uspipe_free P((struct sconnection *qconn));
static boolean fspipe_open P((struct sconnection *qconn, long ibaud,
boolean fwait));
static boolean fspipe_close P((struct sconnection *qconn,
pointer puuconf,
struct uuconf_dialer *qdialer,
boolean fsuccess));
static boolean fspipe_dial P((struct sconnection *qconn, pointer puuconf,
const struct uuconf_system *qsys,
const char *zphone,
struct uuconf_dialer *qdialer,
enum tdialerfound *ptdialer));
/* The command table for standard input ports. */
static const struct sconncmds spipecmds =
{
uspipe_free,
NULL, /* pflock */
NULL, /* pfunlock */
fspipe_open,
fspipe_close,
fspipe_dial,
fsdouble_read,
fsdouble_write,
fsysdep_conn_io,
NULL, /* pfbreak */
NULL, /* pfset */
NULL, /* pfcarrier */
fsdouble_chat,
NULL /* pibaud */
};
/* Initialize a pipe connection. */
boolean
fsysdep_pipe_init (qconn)
struct sconnection *qconn;
{
struct ssysdep_conn *q;
q = (struct ssysdep_conn *) xmalloc (sizeof (struct ssysdep_conn));
q->o = -1;
q->ord = -1;
q->owr = -1;
q->zdevice = NULL;
q->iflags = -1;
q->iwr_flags = -1;
q->fterminal = FALSE;
q->ftli = FALSE;
q->ibaud = 0;
q->ipid = -1;
qconn->psysdep = (pointer) q;
qconn->qcmds = &spipecmds;
return TRUE;
}
static void
uspipe_free (qconn)
struct sconnection *qconn;
{
xfree (qconn->psysdep);
}
/* Open a pipe port. */
/*ARGSUSED*/
static boolean
fspipe_open (qconn, ibaud, fwait)
struct sconnection *qconn;
long ibaud;
boolean fwait;
{
/* We don't do incoming waits on pipes. */
if (fwait)
return FALSE;
return TRUE;
}
/* Close a pipe port. */
/*ARGSUSED*/
static boolean
fspipe_close (qconn, puuconf, qdialer, fsuccess)
struct sconnection *qconn;
pointer puuconf;
struct uuconf_dialer *qdialer;
boolean fsuccess;
{
struct ssysdep_conn *qsysdep;
boolean fret;
qsysdep = (struct ssysdep_conn *) qconn->psysdep;
fret = TRUE;
/* Close our sides of the pipe. */
if (qsysdep->ord >= 0 && close (qsysdep->ord) < 0)
{
ulog (LOG_ERROR, "fspipe_close: close read fd: %s", strerror (errno));
fret = FALSE;
}
if (qsysdep->owr != qsysdep->ord
&& qsysdep->owr >= 0
&& close (qsysdep->owr) < 0)
{
ulog (LOG_ERROR, "fspipe_close: close write fd: %s", strerror (errno));
fret = FALSE;
}
qsysdep->ord = -1;
qsysdep->owr = -1;
/* Kill dangling child process. */
if (qsysdep->ipid >= 0)
{
if (kill (qsysdep->ipid, SIGHUP) == 0)
usysdep_sleep (2);
#ifdef SIGPIPE
if (kill (qsysdep->ipid, SIGPIPE) == 0)
usysdep_sleep (2);
#endif
if (kill (qsysdep->ipid, SIGKILL) < 0 && errno == EPERM)
{
ulog (LOG_ERROR, "fspipe_close: Cannot kill child pid %lu: %s",
(unsigned long) qsysdep->ipid, strerror (errno));
fret = FALSE;
}
else
(void) ixswait ((unsigned long) qsysdep->ipid, (const char *) NULL);
}
qsysdep->ipid = -1;
return fret;
}
/* Dial out on a pipe port, so to speak: launch connection program
under us. The code alternates q->o between q->ord and q->owr as
appropriate. It is always q->ord before any call to fsblock. */
/*ARGSUSED*/
static boolean
fspipe_dial (qconn, puuconf, qsys, zphone, qdialer, ptdialer)
struct sconnection *qconn;
pointer puuconf;
const struct uuconf_system *qsys;
const char *zphone;
struct uuconf_dialer *qdialer;
enum tdialerfound *ptdialer;
{
struct ssysdep_conn *q;
int aidescs[3];
const char **pzprog;
q = (struct ssysdep_conn *) qconn->psysdep;
*ptdialer = DIALERFOUND_FALSE;
pzprog = (const char **) qconn->qport->uuconf_u.uuconf_spipe.uuconf_pzcmd;
if (pzprog == NULL)
{
ulog (LOG_ERROR, "No command for pipe connection");
return FALSE;
}
aidescs[0] = SPAWN_WRITE_PIPE;
aidescs[1] = SPAWN_READ_PIPE;
aidescs[2] = SPAWN_NULL;
/* Pass fkeepuid, fkeepenv and fshell as TRUE. This puts the
responsibility of security on the connection program. */
q->ipid = ixsspawn (pzprog, aidescs, TRUE, TRUE, (const char *) NULL,
FALSE, TRUE, (const char *) NULL,
(const char *) NULL, (const char *) NULL);
if (q->ipid < 0)
{
ulog (LOG_ERROR, "ixsspawn (%s): %s", pzprog[0], strerror (errno));
return FALSE;
}
q->owr = aidescs[0];
q->ord = aidescs[1];
q->o = q->ord;
q->iflags = fcntl (q->ord, F_GETFL, 0);
q->iwr_flags = fcntl (q->owr, F_GETFL, 0);
if (q->iflags < 0 || q->iwr_flags < 0)
{
ulog (LOG_ERROR, "fspipe_dial: fcntl: %s", strerror (errno));
(void) fspipe_close (qconn, puuconf, qdialer, FALSE);
return FALSE;
}
return TRUE;
}
#if 0
/* Marc Boucher's contributed code used an alarm to avoid waiting too
long when closing the pipe. However, I believe that it is not
possible for the kernel to sleep when closing a pipe; it is only
possible when closing a device. Therefore, I have removed the
code, but am preserving it in case I am wrong. To reenable it, the
two calls to close in fspipe_close should be changed to call
fspipe_alarmclose. */
static RETSIGTYPE
usalarm (isig)
int isig;
{
#if ! HAVE_SIGACTION && ! HAVE_SIGVEC && ! HAVE_SIGSET
(void) signal (isig, usalarm);
#endif
#if HAVE_RESTARTABLE_SYSCALLS
longjmp (sSjmp_buf, 1);
#endif
}
static int
fspipe_alarmclose (fd)
int fd;
{
int iret = -1;
int ierrno = 0;
if (fsysdep_catch ())
{
usysdep_start_catch ();
usset_signal (SIGALRM, usalarm, TRUE, (boolean *) NULL);
(void) alarm (30);
iret = close (fd);
ierrno = errno;
}
usset_signal (SIGALRM, SIG_IGN, TRUE, (boolean *) NULL);
(void) alarm (0);
usysdep_end_catch ();
errno = ierrno;
return iret;
}
#endif /* 0 */