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freebsd-dev/contrib/tcsh/sh.c
Brooks Davis d803a9d0e5 Update tcsh to git revision 83c5be0 bringing in a number of bug fixes. 
Reported by:	sobomax
MFC after:	3 days
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D22099
2019-10-21 21:21:34 +00:00

2550 lines
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/*
* sh.c: Main shell routines
*/
/*-
* Copyright (c) 1980, 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define EXTERN /* Intern */
#include "sh.h"
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#include "tc.h"
#include "ed.h"
#include "tw.h"
extern int MapsAreInited;
extern int NLSMapsAreInited;
/*
* C Shell
*
* Bill Joy, UC Berkeley, California, USA
* October 1978, May 1980
*
* Jim Kulp, IIASA, Laxenburg, Austria
* April 1980
*
* Filename recognition added:
* Ken Greer, Ind. Consultant, Palo Alto CA
* October 1983.
*
* Karl Kleinpaste, Computer Consoles, Inc.
* Added precmd, periodic/tperiod, prompt changes,
* directory stack hack, and login watch.
* Sometime March 1983 - Feb 1984.
*
* Added scheduled commands, including the "sched" command,
* plus the call to sched_run near the precmd et al
* routines.
* Upgraded scheduled events for running events while
* sitting idle at command input.
*
* Paul Placeway, Ohio State
* added stuff for running with twenex/inputl 9 Oct 1984.
*
* ported to Apple Unix (TM) (OREO) 26 -- 29 Jun 1987
*/
jmp_buf_t reslab IZERO_STRUCT;
struct wordent paraml IZERO_STRUCT;
static const char tcshstr[] = "tcsh";
struct sigaction parintr; /* Parents interrupt catch */
struct sigaction parterm; /* Parents terminate catch */
#ifdef TESLA
int do_logout = 0;
#endif /* TESLA */
int use_fork = 0; /* use fork() instead of vfork()? */
/*
* Magic pointer values. Used to specify other invalid conditions aside
* from null.
*/
static Char INVCHAR;
Char *INVPTR = &INVCHAR;
Char **INVPPTR = &INVPTR;
static int fast = 0;
static int mflag = 0;
static int prompt = 1;
int enterhist = 0;
int tellwhat = 0;
time_t t_period;
Char *ffile = NULL;
int dolzero = 0;
int insource = 0;
int exitset = 0;
static time_t chktim; /* Time mail last checked */
char *progname;
int tcsh;
/*
* This preserves the input state of the shell. It is used by
* st_save and st_restore to manupulate shell state.
*/
struct saved_state {
int insource;
int OLDSTD;
int SHIN;
int SHOUT;
int SHDIAG;
int intty;
struct whyle *whyles;
Char *gointr;
Char *arginp;
Char *evalp;
Char **evalvec;
Char *alvecp;
Char **alvec;
int onelflg;
int enterhist;
Char **argv;
Char **av;
Char HIST;
int cantell;
struct Bin B;
int justpr;
};
static int srccat (Char *, Char *);
#ifndef WINNT_NATIVE
static int srcfile (const char *, int, int, Char **);
#else
int srcfile (const char *, int, int, Char **);
#endif /*WINNT_NATIVE*/
static void srcunit (int, int, int, Char **);
static void mailchk (void);
#ifndef _PATH_DEFPATH
static Char **defaultpath (void);
#endif
static void record (void);
static void st_save (struct saved_state *, int, int,
Char **, Char **);
static void st_restore (void *);
int main (int, char **);
#ifndef LOCALEDIR
#define LOCALEDIR "/usr/share/locale"
#endif
#ifdef NLS_CATALOGS
static void
add_localedir_to_nlspath(const char *path)
{
static const char msgs_LOC[] = "/%L/LC_MESSAGES/%N.cat";
static const char msgs_lang[] = "/%l/LC_MESSAGES/%N.cat";
char *old;
char *new, *new_p;
size_t len;
int add_LOC = 1;
int add_lang = 1;
char trypath[MAXPATHLEN];
struct stat st;
if (path == NULL)
return;
(void) xsnprintf(trypath, sizeof(trypath), "%s/en/LC_MESSAGES/tcsh.cat",
path);
if (stat(trypath, &st) == -1)
return;
if ((old = getenv("NLSPATH")) != NULL)
len = strlen(old) + 1; /* don't forget the colon. */
else
len = 0;
len += 2 * strlen(path) +
sizeof(msgs_LOC) + sizeof(msgs_lang); /* includes the extra colon */
new = new_p = xcalloc(len, 1);
if (old != NULL) {
size_t pathlen = strlen(path);
char *old_p;
(void) xsnprintf(new_p, len, "%s", old);
new_p += strlen(new_p);
len -= new_p - new;
/* Check if the paths we try to add are already present in NLSPATH.
If so, note it by setting the appropriate flag to 0. */
for (old_p = old; old_p; old_p = strchr(old_p, ':'),
old_p = old_p ? old_p + 1 : NULL) {
if (strncmp(old_p, path, pathlen) != 0)
continue;
if (strncmp(old_p + pathlen, msgs_LOC, sizeof(msgs_LOC) - 1) == 0)
add_LOC = 0;
else if (strncmp(old_p + pathlen, msgs_lang,
sizeof(msgs_lang) - 1) == 0)
add_lang = 0;
}
}
/* Add the message catalog paths not already present to NLSPATH. */
if (add_LOC || add_lang)
(void) xsnprintf(new_p, len, "%s%s%s%s%s%s",
old ? ":" : "",
add_LOC ? path : "", add_LOC ? msgs_LOC : "",
add_LOC && add_lang ? ":" : "",
add_lang ? path : "", add_lang ? msgs_lang : "");
tsetenv(STRNLSPATH, str2short(new));
free(new);
}
#endif
int
main(int argc, char **argv)
{
int batch = 0;
volatile int nexececho = 0;
int nofile = 0;
volatile int nverbose = 0;
volatile int rdirs = 0;
volatile int exitcode = 0;
int quitit = 0;
Char *cp;
#ifdef AUTOLOGOUT
Char *cp2;
#endif
char *tcp, *ttyn;
int f, reenter;
char **tempv;
static const char *targinp = NULL;
int osetintr;
struct sigaction oparintr;
#ifdef WINNT_NATIVE
nt_init();
#endif /* WINNT_NATIVE */
(void)memset(&reslab, 0, sizeof(reslab));
#if defined(NLS_CATALOGS) && defined(LC_MESSAGES)
(void) setlocale(LC_MESSAGES, "");
#endif /* NLS_CATALOGS && LC_MESSAGES */
#ifdef NLS
# ifdef LC_CTYPE
(void) setlocale(LC_CTYPE, ""); /* for iscntrl */
# endif /* LC_CTYPE */
#endif /* NLS */
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
#ifdef NLS_CATALOGS
add_localedir_to_nlspath(LOCALEDIR);
#endif
nlsinit();
initlex(&paraml);
#ifdef MALLOC_TRACE
mal_setstatsfile(fdopen(dmove(xopen("/tmp/tcsh.trace",
O_WRONLY|O_CREAT|O_LARGEFILE, 0666), 25), "w"));
mal_trace(1);
#endif /* MALLOC_TRACE */
#if !(defined(BSDTIMES) || defined(_SEQUENT_)) && defined(POSIX)
# ifdef _SC_CLK_TCK
clk_tck = (clock_t) sysconf(_SC_CLK_TCK);
# else /* ! _SC_CLK_TCK */
# ifdef CLK_TCK
clk_tck = CLK_TCK;
# else /* !CLK_TCK */
clk_tck = HZ;
# endif /* CLK_TCK */
# endif /* _SC_CLK_TCK */
#endif /* !BSDTIMES && POSIX */
settimes(); /* Immed. estab. timing base */
#ifdef TESLA
do_logout = 0;
#endif /* TESLA */
/*
* Make sure we have 0, 1, 2 open
* Otherwise `` jobs will not work... (From knaff@poly.polytechnique.fr)
*/
{
do
if ((f = xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE)) == -1 &&
(f = xopen("/", O_RDONLY|O_LARGEFILE)) == -1)
exit(1);
while (f < 3);
xclose(f);
}
osinit(); /* Os dependent initialization */
{
char *t;
t = strrchr(argv[0], '/');
#ifdef WINNT_NATIVE
{
char *s = strrchr(argv[0], '\\');
if (s)
t = s;
}
#endif /* WINNT_NATIVE */
t = t ? t + 1 : argv[0];
if (*t == '-') t++;
progname = strsave((t && *t) ? t : tcshstr); /* never want a null */
tcsh = strncmp(progname, tcshstr, sizeof(tcshstr) - 1) == 0;
}
/*
* Initialize non constant strings
*/
#ifdef _PATH_BSHELL
STR_BSHELL = SAVE(_PATH_BSHELL);
#endif
#ifdef _PATH_TCSHELL
STR_SHELLPATH = SAVE(_PATH_TCSHELL);
#else
# ifdef _PATH_CSHELL
STR_SHELLPATH = SAVE(_PATH_CSHELL);
# endif
#endif
STR_WORD_CHARS = SAVE(WORD_CHARS);
STR_WORD_CHARS_VI = SAVE(WORD_CHARS_VI);
HIST = '!';
HISTSUB = '^';
PRCH = tcsh ? '>' : '%'; /* to replace %# in $prompt for normal users */
PRCHROOT = '#'; /* likewise for root */
word_chars = STR_WORD_CHARS;
bslash_quote = 0; /* PWP: do tcsh-style backslash quoting? */
anyerror = 1; /* for compatibility */
setcopy(STRanyerror, STRNULL, VAR_READWRITE);
/* Default history size to 100 */
setcopy(STRhistory, str2short("100"), VAR_READWRITE);
sethistory(100);
tempv = argv;
ffile = SAVE(tempv[0]);
dolzero = 0;
if (eq(ffile, STRaout)) /* A.out's are quittable */
quitit = 1;
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
/*
* We are a login shell if: 1. we were invoked as -<something> with
* optional arguments 2. or we were invoked only with the -l flag
*/
loginsh = (**tempv == '-') || (argc == 2 &&
tempv[1][0] == '-' && tempv[1][1] == 'l' &&
tempv[1][2] == '\0');
#ifdef _VMS_POSIX
/* No better way to find if we are a login shell */
if (!loginsh) {
loginsh = (argc == 1 && getppid() == 1);
**tempv = '-'; /* Avoid giving VMS an acidic stomach */
}
#endif /* _VMS_POSIX */
if (loginsh && **tempv != '-') {
char *argv0;
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
argv0 = strspl("-", *tempv);
*tempv = argv0;
argc--;
}
if (loginsh) {
(void) time(&chktim);
setNS(STRloginsh);
}
NoNLSRebind = getenv("NOREBIND") != NULL;
#ifdef NLS
# ifdef SETLOCALEBUG
dont_free = 1;
# endif /* SETLOCALEBUG */
(void) setlocale(LC_ALL, "");
# ifdef LC_COLLATE
(void) setlocale(LC_COLLATE, "");
# endif
# ifdef SETLOCALEBUG
dont_free = 0;
# endif /* SETLOCALEBUG */
# ifdef STRCOLLBUG
fix_strcoll_bug();
# endif /* STRCOLLBUG */
/*
* On solaris ISO8859-1 contains no printable characters in the upper half
* so we need to test only for MB_CUR_MAX == 1, otherwise for multi-byte
* locales we are always AsciiOnly == 0.
*/
if (MB_CUR_MAX == 1) {
int k;
for (k = 0200; k <= 0377 && !isprint(CTL_ESC(k)); k++)
continue;
AsciiOnly = k > 0377;
} else
AsciiOnly = 0;
#else
AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
#endif /* NLS */
if (MapsAreInited && !NLSMapsAreInited)
ed_InitNLSMaps();
ResetArrowKeys();
/*
* Initialize for periodic command intervals. Also, initialize the dummy
* tty list for login-watch.
*/
(void) time(&t_period);
#ifndef HAVENOUTMP
initwatch();
#endif /* !HAVENOUTMP */
#if defined(alliant)
/*
* From: Jim Pace <jdp@research.att.com>
* tcsh does not work properly on the alliants through an rlogin session.
* The shell generally hangs. Also, reference to the controlling terminal
* does not work ( ie: echo foo > /dev/tty ).
*
* A security feature was added to rlogind affecting FX/80's Concentrix
* from revision 5.5.xx upwards (through 5.7 where this fix was implemented)
* This security change also affects the FX/2800 series.
* The security change to rlogind requires the process group of an rlogin
* session become disassociated with the tty in rlogind.
*
* The changes needed are:
* 1. set the process group
* 2. reenable the control terminal
*/
if (loginsh && isatty(SHIN)) {
ttyn = ttyname(SHIN);
xclose(SHIN);
SHIN = xopen(ttyn, O_RDWR|O_LARGEFILE);
shpgrp = getpid();
(void) ioctl (SHIN, TIOCSPGRP, (ioctl_t) &shpgrp);
(void) setpgid(0, shpgrp);
}
#endif /* alliant */
/*
* Move the descriptors to safe places. The variable didfds is 0 while we
* have only FSH* to work with. When didfds is true, we have 0,1,2 and
* prefer to use these.
*/
initdesc();
cdtohome = 1;
setv(STRcdtohome, SAVE(""), VAR_READWRITE);
/*
* Get and set the tty now
*/
if ((ttyn = ttyname(SHIN)) != NULL) {
/*
* Could use rindex to get rid of other possible path components, but
* hpux preserves the subdirectory /pty/ when storing the tty name in
* utmp, so we keep it too.
*/
if (strncmp(ttyn, "/dev/", 5) == 0)
setv(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE);
else
setv(STRtty, cp = SAVE(ttyn), VAR_READWRITE);
}
else
setv(STRtty, cp = SAVE(""), VAR_READWRITE);
/*
* Initialize the shell variables. ARGV and PROMPT are initialized later.
* STATUS is also munged in several places. CHILD is munged when
* forking/waiting
*/
/*
* 7-10-87 Paul Placeway autologout should be set ONLY on login shells and
* on shells running as root. Out of these, autologout should NOT be set
* for any psudo-terminals (this catches most window systems) and not for
* any terminal running X windows.
*
* At Ohio State, we have had problems with a user having his X session
* drop out from under him (on a Sun) because the shell in his master
* xterm timed out and exited.
*
* Really, this should be done with a program external to the shell, that
* watches for no activity (and NO running programs, such as dump) on a
* terminal for a long peroid of time, and then SIGHUPS the shell on that
* terminal.
*
* bugfix by Rich Salz <rsalz@PINEAPPLE.BBN.COM>: For root rsh things
* allways first check to see if loginsh or really root, then do things
* with ttyname()
*
* Also by Jean-Francois Lamy <lamy%ai.toronto.edu@RELAY.CS.NET>: check the
* value of cp before using it! ("root can rsh too")
*
* PWP: keep the nested ifs; the order of the tests matters and a good
* (smart) C compiler might re-arange things wrong.
*/
#ifdef AUTOLOGOUT
# ifdef convex
if (uid == 0)
/* root always has a 15 minute autologout */
setcopy(STRautologout, STRrootdefautologout, VAR_READWRITE);
else
if (loginsh)
/* users get autologout set to 0 */
setcopy(STRautologout, STR0, VAR_READWRITE);
# else /* convex */
if (loginsh || (uid == 0)) {
if (*cp) {
/* only for login shells or root and we must have a tty */
if (((cp2 = Strrchr(cp, (Char) '/')) != NULL) &&
(Strncmp(cp, STRptssl, 3) != 0)) {
cp2 = cp2 + 1;
}
else
cp2 = cp;
if (!(((Strncmp(cp2, STRtty, 3) == 0) && Isalpha(cp2[3])) ||
Strstr(cp, STRptssl) != NULL)) {
if (getenv("DISPLAY") == NULL) {
/* NOT on X window shells */
setcopy(STRautologout, STRdefautologout, VAR_READWRITE);
}
}
}
}
# endif /* convex */
#endif /* AUTOLOGOUT */
sigset_interrupting(SIGALRM, queue_alrmcatch);
setcopy(STRstatus, STR0, VAR_READWRITE);
/*
* get and set machine specific environment variables
*/
getmachine();
/*
* Publish the selected echo style
*/
#if ECHO_STYLE != BSD_ECHO
if (tcsh) {
# if ECHO_STYLE == NONE_ECHO
setcopy(STRecho_style, STRnone, VAR_READWRITE);
# endif /* ECHO_STYLE == NONE_ECHO */
# if ECHO_STYLE == SYSV_ECHO
setcopy(STRecho_style, STRsysv, VAR_READWRITE);
# endif /* ECHO_STYLE == SYSV_ECHO */
# if ECHO_STYLE == BOTH_ECHO
setcopy(STRecho_style, STRboth, VAR_READWRITE);
# endif /* ECHO_STYLE == BOTH_ECHO */
} else
#endif /* ECHO_STYLE != BSD_ECHO */
setcopy(STRecho_style, STRbsd, VAR_READWRITE);
/*
* increment the shell level.
*/
shlvl(1);
#ifdef __ANDROID__
/* On Android, $HOME either isn't set or set to /data, a R/O location.
Check for the environment variable EXTERNAL_STORAGE, which contains
the mount point of the external storage (SD card, mostly). If
EXTERNAL_STORAGE isn't set fall back to "/sdcard". Eventually
override $HOME so the environment is on the same page. */
if (((tcp = getenv("HOME")) != NULL && strcmp (tcp, "/data") != 0)
|| (tcp = getenv("EXTERNAL_STORAGE")) != NULL) {
cp = quote(SAVE(tcp));
} else
cp = quote(SAVE("/sdcard"));
tsetenv(STRKHOME, cp);
#else
if ((tcp = getenv("HOME")) != NULL)
cp = quote(SAVE(tcp));
else
cp = NULL;
#endif
if (cp == NULL)
fast = 1; /* No home -> can't read scripts */
else
setv(STRhome, cp, VAR_READWRITE);
dinit(cp); /* dinit thinks that HOME == cwd in a login
* shell */
/*
* Grab other useful things from the environment. Should we grab
* everything??
*/
{
char *cln, *cus, *cgr;
struct passwd *pw;
struct group *gr;
#ifdef apollo
int oid = getoid();
setv(STRoid, Itoa(oid, 0, 0), VAR_READWRITE);
#endif /* apollo */
setv(STReuid, Itoa(euid, 0, 0), VAR_READWRITE);
if ((pw = xgetpwuid(euid)) == NULL)
setcopy(STReuser, STRunknown, VAR_READWRITE);
else
setcopy(STReuser, str2short(pw->pw_name), VAR_READWRITE);
setv(STRuid, Itoa(uid, 0, 0), VAR_READWRITE);
setv(STRgid, Itoa(gid, 0, 0), VAR_READWRITE);
cln = getenv("LOGNAME");
cus = getenv("USER");
if (cus != NULL)
setv(STRuser, quote(SAVE(cus)), VAR_READWRITE);
else if (cln != NULL)
setv(STRuser, quote(SAVE(cln)), VAR_READWRITE);
else if ((pw = xgetpwuid(uid)) == NULL)
setcopy(STRuser, STRunknown, VAR_READWRITE);
else
setcopy(STRuser, str2short(pw->pw_name), VAR_READWRITE);
if (cln == NULL)
tsetenv(STRLOGNAME, varval(STRuser));
if (cus == NULL)
tsetenv(STRKUSER, varval(STRuser));
cgr = getenv("GROUP");
if (cgr != NULL)
setv(STRgroup, quote(SAVE(cgr)), VAR_READWRITE);
else if ((gr = xgetgrgid(gid)) == NULL)
setcopy(STRgroup, STRunknown, VAR_READWRITE);
else
setcopy(STRgroup, str2short(gr->gr_name), VAR_READWRITE);
if (cgr == NULL)
tsetenv(STRKGROUP, varval(STRgroup));
}
/*
* HOST may be wrong, since rexd transports the entire environment on sun
* 3.x Just set it again
*/
{
char cbuff[MAXHOSTNAMELEN];
if (gethostname(cbuff, sizeof(cbuff)) >= 0) {
cbuff[sizeof(cbuff) - 1] = '\0'; /* just in case */
tsetenv(STRHOST, str2short(cbuff));
}
else
tsetenv(STRHOST, STRunknown);
}
#ifdef REMOTEHOST
/*
* Try to determine the remote host we were logged in from.
*/
remotehost();
#endif /* REMOTEHOST */
#ifdef apollo
if ((tcp = getenv("SYSTYPE")) == NULL)
tcp = "bsd4.3";
tsetenv(STRSYSTYPE, quote(str2short(tcp)));
#endif /* apollo */
/*
* set editing on by default, unless running under Emacs as an inferior
* shell.
* We try to do this intelligently. If $TERM is available, then it
* should determine if we should edit or not. $TERM is preserved
* across rlogin sessions, so we will not get confused if we rlogin
* under an emacs shell. Another advantage is that if we run an
* xterm under an emacs shell, then the $TERM will be set to
* xterm, so we are going to want to edit. Unfortunately emacs
* does not restore all the tty modes, so xterm is not very well
* set up. But this is not the shell's fault.
* Also don't edit if $TERM == wm, for when we're running under an ATK app.
* Finally, emacs compiled under terminfo, sets the terminal to dumb,
* so disable editing for that too.
*
* Unfortunately, in some cases the initial $TERM setting is "unknown",
* "dumb", or "network" which is then changed in the user's startup files.
* We fix this by setting noediting here if $TERM is unknown/dumb and
* if noediting is set, we switch on editing if $TERM is changed.
*/
if ((tcp = getenv("TERM")) != NULL) {
setv(STRterm, quote(SAVE(tcp)), VAR_READWRITE);
noediting = strcmp(tcp, "unknown") == 0 || strcmp(tcp, "dumb") == 0 ||
strcmp(tcp, "network") == 0;
editing = strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0 &&
!noediting;
}
else {
noediting = 0;
editing = ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0);
}
/*
* The 'edit' variable is either set or unset. It doesn't
* need a value. Making it 'emacs' might be confusing.
*/
if (editing)
setNS(STRedit);
/*
* still more mutability: make the complete routine automatically add the
* suffix of file names...
*/
setNS(STRaddsuffix);
/*
* Compatibility with tcsh >= 6.12 by default
*/
setNS(STRcsubstnonl);
/*
* Random default kill ring size
*/
setcopy(STRkillring, str2short("30"), VAR_READWRITE);
/*
* Re-initialize path if set in environment
*/
if ((tcp = getenv("PATH")) == NULL)
#ifdef _PATH_DEFPATH
importpath(str2short(_PATH_DEFPATH));
#else /* !_PATH_DEFPATH */
setq(STRpath, defaultpath(), &shvhed, VAR_READWRITE);
#endif /* _PATH_DEFPATH */
else
/* Importpath() allocates memory for the path, and the
* returned pointer from SAVE() was discarded, so
* this was a memory leak.. (sg)
*
* importpath(SAVE(tcp));
*/
importpath(str2short(tcp));
{
/* If the SHELL environment variable ends with "tcsh", set
* STRshell to the same path. This is to facilitate using
* the executable in environments where the compiled-in
* default isn't appropriate (sg).
*/
size_t sh_len = 0;
if ((tcp = getenv("SHELL")) != NULL) {
sh_len = strlen(tcp);
if ((sh_len >= 5 && strcmp(tcp + (sh_len - 5), "/tcsh") == 0) ||
(!tcsh && sh_len >= 4 && strcmp(tcp + (sh_len - 4), "/csh") == 0))
setv(STRshell, quote(SAVE(tcp)), VAR_READWRITE);
else
sh_len = 0;
}
if (sh_len == 0)
setcopy(STRshell, STR_SHELLPATH, VAR_READWRITE);
}
#ifdef _OSD_POSIX /* BS2000 needs this variable set to "SHELL" */
if ((tcp = getenv("PROGRAM_ENVIRONMENT")) == NULL)
tcp = "SHELL";
tsetenv(STRPROGRAM_ENVIRONMENT, quote(str2short(tcp)));
#endif /* _OSD_POSIX */
#ifdef COLOR_LS_F
if ((tcp = getenv("LS_COLORS")) != NULL)
parseLS_COLORS(str2short(tcp));
if ((tcp = getenv("LSCOLORS")) != NULL)
parseLSCOLORS(str2short(tcp));
#endif /* COLOR_LS_F */
mainpid = getpid();
doldol = putn((tcsh_number_t)mainpid); /* For $$ */
#ifdef WINNT_NATIVE
{
char *tmp;
Char *tmp2;
if ((tmp = getenv("TMP")) != NULL) {
tmp = xasprintf("%s/%s", tmp, "sh");
tmp2 = SAVE(tmp);
xfree(tmp);
}
else {
tmp2 = SAVE("");
}
shtemp = Strspl(tmp2, doldol); /* For << */
xfree(tmp2);
}
#else /* !WINNT_NATIVE */
#ifdef HAVE_MKSTEMP
{
const char *tmpdir = getenv ("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
shtemp = Strspl(SAVE(tmpdir), SAVE("/sh" TMP_TEMPLATE)); /* For << */
}
#else /* !HAVE_MKSTEMP */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
#endif /* HAVE_MKSTEMP */
#endif /* WINNT_NATIVE */
/*
* Record the interrupt states from the parent process. If the parent is
* non-interruptible our hand must be forced or we (and our children) won't
* be either. Our children inherit termination from our parent. We catch it
* only if we are the login shell.
*/
sigaction(SIGINT, NULL, &parintr);
sigaction(SIGTERM, NULL, &parterm);
#ifdef TCF
/* Enable process migration on ourselves and our progeny */
(void) signal(SIGMIGRATE, SIG_DFL);
#endif /* TCF */
/*
* dspkanji/dspmbyte autosetting
*/
/* PATCH IDEA FROM Issei.Suzuki VERY THANKS */
#if defined(DSPMBYTE)
#if defined(NLS) && defined(LC_CTYPE)
if (((tcp = setlocale(LC_CTYPE, NULL)) != NULL || (tcp = getenv("LANG")) != NULL) && !adrof(CHECK_MBYTEVAR))
#else
if ((tcp = getenv("LANG")) != NULL && !adrof(CHECK_MBYTEVAR))
#endif
{
autoset_dspmbyte(str2short(tcp));
}
#if defined(WINNT_NATIVE)
else if (!adrof(CHECK_MBYTEVAR))
nt_autoset_dspmbyte();
#endif /* WINNT_NATIVE */
#endif
#if defined(AUTOSET_KANJI)
# if defined(NLS) && defined(LC_CTYPE)
if (setlocale(LC_CTYPE, NULL) != NULL || getenv("LANG") != NULL)
# else
if (getenv("LANG") != NULL)
# endif
autoset_kanji();
#endif /* AUTOSET_KANJI */
fix_version(); /* publish the shell version */
if (argc > 1 && strcmp(argv[1], "--version") == 0) {
xprintf("%S\n", varval(STRversion));
xexit(0);
}
if (argc > 1 && strcmp(argv[1], "--help") == 0) {
xprintf("%S\n\n", varval(STRversion));
xprintf("%s", CGETS(11, 8, HELP_STRING));
xexit(0);
}
/*
* Process the arguments.
*
* Note that processing of -v/-x is actually delayed till after script
* processing.
*
* We set the first character of our name to be '-' if we are a shell
* running interruptible commands. Many programs which examine ps'es
* use this to filter such shells out.
*/
argc--, tempv++;
while (argc > 0 && (tcp = tempv[0])[0] == '-' &&
*++tcp != '\0' && !batch) {
do
switch (*tcp++) {
case 0: /* - Interruptible, no prompt */
prompt = 0;
setintr = 1;
nofile = 1;
break;
case 'b': /* -b Next arg is input file */
batch = 1;
break;
case 'c': /* -c Command input from arg */
if (argc == 1)
xexit(0);
argc--, tempv++;
#ifdef M_XENIX
/* Xenix Vi bug:
it relies on a 7 bit environment (/bin/sh), so it
pass ascii arguments with the 8th bit set */
if (!strcmp(argv[0], "sh"))
{
char *p;
for (p = tempv[0]; *p; ++p)
*p &= ASCII;
}
#endif
targinp = tempv[0];
prompt = 0;
nofile = 1;
break;
case 'd': /* -d Load directory stack from file */
rdirs = 1;
break;
#ifdef apollo
case 'D': /* -D Define environment variable */
{
Char *dp;
cp = str2short(tcp);
if (dp = Strchr(cp, '=')) {
*dp++ = '\0';
tsetenv(cp, dp);
}
else
tsetenv(cp, STRNULL);
}
*tcp = '\0'; /* done with this argument */
break;
#endif /* apollo */
case 'e': /* -e Exit on any error */
exiterr = 1;
break;
case 'f': /* -f Fast start */
fast = 1;
break;
case 'i': /* -i Interactive, even if !intty */
intact = 1;
nofile = 1;
break;
case 'm': /* -m read .cshrc (from su) */
mflag = 1;
break;
case 'n': /* -n Don't execute */
noexec = 1;
break;
case 'q': /* -q (Undoc'd) ... die on quit */
quitit = 1;
break;
case 's': /* -s Read from std input */
nofile = 1;
break;
case 't': /* -t Read one line from input */
onelflg = 2;
prompt = 0;
nofile = 1;
break;
case 'v': /* -v Echo hist expanded input */
nverbose = 1; /* ... later */
break;
case 'x': /* -x Echo just before execution */
nexececho = 1; /* ... later */
break;
case 'V': /* -V Echo hist expanded input */
setNS(STRverbose); /* NOW! */
break;
case 'X': /* -X Echo just before execution */
setNS(STRecho); /* NOW! */
break;
case 'F':
/*
* This will cause children to be created using fork instead of
* vfork.
*/
use_fork = 1;
break;
case ' ':
case '\t':
case '\r':
case '\n':
/*
* for O/S's that don't do the argument parsing right in
* "#!/foo -f " scripts
*/
break;
default: /* Unknown command option */
exiterr = 1;
stderror(ERR_TCSHUSAGE, tcp-1, progname);
break;
} while (*tcp);
tempv++, argc--;
}
if (quitit) /* With all due haste, for debugging */
(void) signal(SIGQUIT, SIG_DFL);
/*
* Unless prevented by -, -c, -i, -s, or -t, if there are remaining
* arguments the first of them is the name of a shell file from which to
* read commands.
*/
if (nofile == 0 && argc > 0) {
nofile = xopen(tempv[0], O_RDONLY|O_LARGEFILE);
if (nofile < 0) {
child = 1; /* So this ... */
/* ... doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
xfree(ffile);
dolzero = 1;
ffile = SAVE(tempv[0]);
/*
* Replace FSHIN. Handle /dev/std{in,out,err} specially
* since once they are closed we cannot open them again.
* In that case we use our own saved descriptors
*/
if ((SHIN = dmove(nofile, FSHIN)) < 0)
switch(nofile) {
case 0:
SHIN = FSHIN;
break;
case 1:
SHIN = FSHOUT;
break;
case 2:
SHIN = FSHDIAG;
break;
default:
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
break;
}
(void) close_on_exec(SHIN, 1);
prompt = 0;
/* argc not used any more */ tempv++;
}
/*
* Call to closem() used to be part of initdesc(). Now called below where
* the script name argument has become stdin. Kernel may have used a file
* descriptor to hold the name of the script (setuid case) and this name
* mustn't be lost by closing the fd too soon.
*/
closem();
/*
* Consider input a tty if it really is or we are interactive. but not for
* editing (christos)
*/
if (!(intty = isatty(SHIN))) {
if (adrof(STRedit))
unsetv(STRedit);
editing = 0;
}
intty |= intact;
#ifndef convex
if (intty || (intact && isatty(SHOUT))) {
if (!batch && (uid != euid || gid != egid)) {
errno = EACCES;
child = 1; /* So this ... */
/* ... doesn't return */
stderror(ERR_SYSTEM, progname, strerror(errno));
}
}
#endif /* convex */
isoutatty = isatty(SHOUT);
isdiagatty = isatty(SHDIAG);
/*
* Decide whether we should play with signals or not. If we are explicitly
* told (via -i, or -) or we are a login shell (arg0 starts with -) or the
* input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
* Note that in only the login shell is it likely that parent may have set
* signals to be ignored
*/
if (loginsh || intact || (intty && isatty(SHOUT)))
setintr = 1;
settell();
/*
* Save the remaining arguments in argv.
*/
setq(STRargv, blk2short(tempv), &shvhed, VAR_READWRITE);
/*
* Set up the prompt.
*/
if (prompt) {
setcopy(STRprompt, STRdefprompt, VAR_READWRITE);
/* that's a meta-questionmark */
setcopy(STRprompt2, STRmquestion, VAR_READWRITE);
setcopy(STRprompt3, STRKCORRECT, VAR_READWRITE);
}
/*
* If we are an interactive shell, then start fiddling with the signals;
* this is a tricky game.
*/
shpgrp = mygetpgrp();
opgrp = tpgrp = -1;
if (setintr) {
struct sigaction osig;
**argv = '-';
if (!quitit) /* Wary! */
(void) signal(SIGQUIT, SIG_IGN);
pintr_disabled = 1;
sigset_interrupting(SIGINT, queue_pintr);
(void) signal(SIGTERM, SIG_IGN);
/*
* No reason I can see not to save history on all these events..
* Most usual occurrence is in a window system, where we're not a login
* shell, but might as well be... (sg)
* But there might be races when lots of shells exit together...
* [this is also incompatible].
* We have to be mre careful here. If the parent wants to
* ignore the signals then we leave them untouched...
* We also only setup the handlers for shells that are trully
* interactive.
*/
sigaction(SIGHUP, NULL, &osig);
if (loginsh || osig.sa_handler != SIG_IGN)
/* exit processing on HUP */
sigset_interrupting(SIGHUP, queue_phup);
#ifdef SIGXCPU
sigaction(SIGXCPU, NULL, &osig);
if (loginsh || osig.sa_handler != SIG_IGN)
/* exit processing on XCPU */
sigset_interrupting(SIGXCPU, queue_phup);
#endif
#ifdef SIGXFSZ
sigaction(SIGXFSZ, NULL, &osig);
if (loginsh || osig.sa_handler != SIG_IGN)
/* exit processing on XFSZ */
sigset_interrupting(SIGXFSZ, queue_phup);
#endif
if (quitit == 0 && targinp == 0) {
#ifdef SIGTSTP
(void) signal(SIGTSTP, SIG_IGN);
#endif
#ifdef SIGTTIN
(void) signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTTOU
(void) signal(SIGTTOU, SIG_IGN);
#endif
/*
* Wait till in foreground, in case someone stupidly runs csh &
* dont want to try to grab away the tty.
*/
if (isatty(FSHDIAG))
f = FSHDIAG;
else if (isatty(FSHOUT))
f = FSHOUT;
else if (isatty(OLDSTD))
f = OLDSTD;
else
f = -1;
#ifdef NeXT
/* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */
if (f != -1 && shpgrp == 0) {
shpgrp = getpid();
(void) setpgid(0, shpgrp);
(void) tcsetpgrp(f, shpgrp);
}
#endif /* NeXT */
#ifdef BSDJOBS /* if we have tty job control */
if (f != -1 && grabpgrp(f, shpgrp) != -1) {
/*
* Thanks to Matt Day for the POSIX references, and to
* Paul Close for the SGI clarification.
*/
if (setdisc(f) != -1) {
opgrp = shpgrp;
shpgrp = getpid();
tpgrp = shpgrp;
if (tcsetpgrp(f, shpgrp) == -1) {
/*
* On hpux 7.03 this fails with EPERM. This happens on
* the 800 when opgrp != shpgrp at this point. (we were
* forked from a non job control shell)
* POSIX 7.2.4, says we failed because the process
* group specified did not belong to a process
* in the same session with the tty. So we set our
* process group and try again.
*/
if (setpgid(0, shpgrp) == -1) {
xprintf("setpgid:");
goto notty;
}
if (tcsetpgrp(f, shpgrp) == -1) {
xprintf("tcsetpgrp:");
goto notty;
}
}
/*
* We check the process group now. If it is the same, then
* we don't need to set it again. On hpux 7.0 on the 300's
* if we set it again it fails with EPERM. This is the
* correct behavior according to POSIX 4.3.3 if the process
* was a session leader .
*/
else if (shpgrp != mygetpgrp()) {
if(setpgid(0, shpgrp) == -1) {
xprintf("setpgid:");
goto notty;
}
}
#ifdef IRIS4D
/*
* But on irix 3.3 we need to set it again, even if it is
* the same. We do that to tell the system that we
* need BSD process group compatibility.
*/
else
(void) setpgid(0, shpgrp);
#endif
(void) close_on_exec(dcopy(f, FSHTTY), 1);
}
else
tpgrp = -1;
}
if (tpgrp == -1) {
notty:
xprintf(CGETS(11, 1, "Warning: no access to tty (%s).\n"),
strerror(errno));
xprintf("%s",
CGETS(11, 2, "Thus no job control in this shell.\n"));
/*
* Fix from:Sakari Jalovaara <sja@sirius.hut.fi> if we don't
* have access to tty, disable editing too
*/
if (adrof(STRedit))
unsetv(STRedit);
editing = 0;
}
#else /* BSDJOBS */ /* don't have job control, so frotz it */
tpgrp = -1;
#endif /* BSDJOBS */
}
}
if (setintr == 0 && parintr.sa_handler == SIG_DFL)
setintr = 1;
/*
* SVR4 doesn't send a SIGCHLD when a child is stopped or continued if the
* handler is installed with signal(2) or sigset(2). sigaction(2) must
* be used instead.
*
* David Dawes (dawes@physics.su.oz.au) Sept 1991
*/
sigset_interrupting(SIGCHLD, queue_pchild);
if (intty && !targinp)
(void) ed_Setup(editing);/* Get the tty state, and set defaults */
/* Only alter the tty state if editing */
/*
* Set an exit here in case of an interrupt or error reading the shell
* start-up scripts.
*/
osetintr = setintr;
oparintr = parintr;
(void)cleanup_push_mark(); /* There is no outer handler */
if (setexit() != 0) /* PWP */
reenter = 1;
else
reenter = 0;
exitset++;
haderr = 0; /* In case second time through */
if (!fast && reenter == 0) {
/* Will have varval(STRhome) here because set fast if don't */
{
pintr_disabled++;
cleanup_push(&pintr_disabled, disabled_cleanup);
setintr = 0;/*FIXRESET:cleanup*/
/* onintr in /etc/ files has no effect */
parintr.sa_handler = SIG_IGN;/*FIXRESET: cleanup*/
#ifdef LOGINFIRST
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
#endif
#endif
#ifdef _PATH_DOTCSHRC
(void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL);
#endif
if (!targinp && !onelflg && !havhash)
dohash(NULL,NULL);
#ifndef LOGINFIRST
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
#endif
#endif
cleanup_until(&pintr_disabled);
setintr = osetintr;
parintr = oparintr;
}
#ifdef LOGINFIRST
if (loginsh)
(void) srccat(varval(STRhome), STRsldotlogin);
#endif
/* upward compat. */
if (!srccat(varval(STRhome), STRsldottcshrc))
(void) srccat(varval(STRhome), STRsldotcshrc);
if (!targinp && !onelflg && !havhash)
dohash(NULL,NULL);
/*
* Source history before .login so that it is available in .login
*/
loadhist(NULL, 0);
#ifndef LOGINFIRST
if (loginsh)
(void) srccat(varval(STRhome), STRsldotlogin);
#endif
if (loginsh || rdirs)
loaddirs(NULL);
}
/* Reset interrupt flag */
setintr = osetintr;
parintr = oparintr;
exitset--;
/* Initing AFTER .cshrc is the Right Way */
if (intty && !targinp) { /* PWP setup stuff */
ed_Init(); /* init the new line editor */
#ifdef SIG_WINDOW
check_window_size(1); /* mung environment */
#endif /* SIG_WINDOW */
}
/*
* Now are ready for the -v and -x flags
*/
if (nverbose)
setNS(STRverbose);
if (nexececho)
setNS(STRecho);
if (targinp) {
/* If this -c command caused an error before, skip processing */
if (reenter && arginp) {
exitcode = 1;
goto done;
}
arginp = SAVE(targinp);
/*
* we put the command into a variable
*/
if (arginp != NULL)
setv(STRcommand, quote(Strsave(arginp)), VAR_READWRITE);
/*
* * Give an error on -c arguments that end in * backslash to
* ensure that you don't make * nonportable csh scripts.
*/
{
int count;
cp = Strend(arginp);
count = 0;
while (cp > arginp && *--cp == '\\')
++count;
if ((count & 1) != 0) {
exiterr = 1;
stderror(ERR_ARGC);
}
}
}
/*
* All the rest of the world is inside this call. The argument to process
* indicates whether it should catch "error unwinds". Thus if we are a
* interactive shell our call here will never return by being blown past on
* an error.
*/
process(setintr);
done:
/*
* Mop-up.
*/
/* Take care of these (especially HUP) here instead of inside flush. */
handle_pending_signals();
if (intty) {
if (loginsh) {
xprintf("logout\n");
xclose(SHIN);
child = 1;
#ifdef TESLA
do_logout = 1;
#endif /* TESLA */
goodbye(NULL, NULL);
}
else {
xprintf("exit\n");
}
}
record();
exitstat();
return exitcode;
}
void
untty(void)
{
#ifdef BSDJOBS
if (tpgrp > 0 && opgrp != shpgrp) {
(void) setpgid(0, opgrp);
(void) tcsetpgrp(FSHTTY, opgrp);
(void) resetdisc(FSHTTY);
}
#endif /* BSDJOBS */
}
void
importpath(Char *cp)
{
size_t i = 0;
Char *dp;
Char **pv;
int c;
for (dp = cp; *dp; dp++)
if (*dp == PATHSEP)
i++;
/*
* i+2 where i is the number of colons in the path. There are i+1
* directories in the path plus we need room for a zero terminator.
*/
pv = xcalloc(i + 2, sizeof(Char *));
dp = cp;
i = 0;
if (*dp)
for (;;) {
if ((c = *dp) == PATHSEP || c == 0) {
*dp = 0;
pv[i++] = Strsave(*cp ? cp : STRdot);
if (c) {
cp = dp + 1;
*dp = PATHSEP;
}
else
break;
}
#ifdef WINNT_NATIVE
else if (*dp == '\\')
*dp = '/';
#endif /* WINNT_NATIVE */
dp++;
}
pv[i] = 0;
cleanup_push(pv, blk_cleanup);
setq(STRpath, pv, &shvhed, VAR_READWRITE);
cleanup_ignore(pv);
cleanup_until(pv);
}
/*
* Source to the file which is the catenation of the argument names.
*/
static int
srccat(Char *cp, Char *dp)
{
if (cp[0] == '/' && cp[1] == '\0')
return srcfile(short2str(dp), (mflag ? 0 : 1), 0, NULL);
else {
Char *ep;
char *ptr;
int rv;
#ifdef WINNT_NATIVE
ep = Strend(cp);
if (ep != cp && ep[-1] == '/' && dp[0] == '/') /* silly win95 */
dp++;
#endif /* WINNT_NATIVE */
ep = Strspl(cp, dp);
cleanup_push(ep, xfree);
ptr = short2str(ep);
rv = srcfile(ptr, (mflag ? 0 : 1), 0, NULL);
cleanup_until(ep);
return rv;
}
}
/*
* Source to a file putting the file descriptor in a safe place (> 2).
*/
#ifndef WINNT_NATIVE
static int
#else
int
#endif /*WINNT_NATIVE*/
srcfile(const char *f, int onlyown, int flag, Char **av)
{
int unit;
if ((unit = xopen(f, O_RDONLY|O_LARGEFILE)) == -1)
return 0;
cleanup_push(&unit, open_cleanup);
unit = dmove(unit, -1);
cleanup_ignore(&unit);
cleanup_until(&unit);
(void) close_on_exec(unit, 1);
srcunit(unit, onlyown, flag, av);
return 1;
}
/*
* Save the shell state, and establish new argument vector, and new input
* fd.
*/
static void
st_save(struct saved_state *st, int unit, int hflg, Char **al, Char **av)
{
st->insource = insource;
st->SHIN = SHIN;
/* Want to preserve the meaning of "source file >output".
* Save old descriptors, move new 0,1,2 to safe places and assign
* them to SH* and let process() redo 0,1,2 from them.
*
* The macro returns true if d1 and d2 are good and they point to
* different things. If you don't avoid saving duplicate
* descriptors, you really limit the depth of "source" recursion
* you can do because of all the open file descriptors. -IAN!
*/
#define NEED_SAVE_FD(d1,d2) \
(fstat(d1, &s1) != -1 && fstat(d2, &s2) != -1 \
&& (s1.st_ino != s2.st_ino || s1.st_dev != s2.st_dev) )
st->OLDSTD = st->SHOUT = st->SHDIAG = -1;/* test later to restore these */
if (didfds) {
struct stat s1, s2;
if (NEED_SAVE_FD(0,OLDSTD)) {
st->OLDSTD = OLDSTD;
OLDSTD = dmove(0, -1);
(void)close_on_exec(OLDSTD, 1);
}
if (NEED_SAVE_FD(1,SHOUT)) {
st->SHOUT = SHOUT;
SHOUT = dmove(1, -1);
(void)close_on_exec(SHOUT, 1);
}
if (NEED_SAVE_FD(2,SHDIAG)) {
st->SHDIAG = SHDIAG;
SHDIAG = dmove(2, -1);
(void)close_on_exec(SHDIAG, 1);
}
donefds();
}
st->intty = intty;
st->whyles = whyles;
st->gointr = gointr;
st->arginp = arginp;
st->evalp = evalp;
st->evalvec = evalvec;
st->alvecp = alvecp;
st->alvec = alvec;
st->onelflg = onelflg;
st->enterhist = enterhist;
st->justpr = justpr;
if (hflg)
st->HIST = HIST;
else
st->HIST = '\0';
st->cantell = cantell;
cpybin(st->B, B);
/*
* we can now pass arguments to source.
* For compatibility we do that only if arguments were really
* passed, otherwise we keep the old, global $argv like before.
*/
if (av != NULL && *av != NULL) {
struct varent *vp;
if ((vp = adrof(STRargv)) != NULL && vp->vec != NULL)
st->argv = saveblk(vp->vec);
else
st->argv = NULL;
setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE);
}
else
st->argv = NULL;
st->av = av;
SHIN = unit; /* Do this first */
/* Establish new input arena */
{
fbuf = NULL;
fseekp = feobp = fblocks = 0;
settell();
}
arginp = 0;
onelflg = 0;
intty = isatty(SHIN);
whyles = 0;
gointr = 0;
evalvec = 0;
evalp = 0;
alvec = al;
alvecp = 0;
enterhist = hflg;
if (enterhist)
HIST = '\0';
insource = 1;
}
/*
* Restore the shell to a saved state
*/
static void
st_restore(void *xst)
{
struct saved_state *st;
st = xst;
if (st->SHIN == -1)
return;
/* Reset input arena */
{
int i;
Char** nfbuf = fbuf;
int nfblocks = fblocks;
fblocks = 0;
fbuf = NULL;
for (i = 0; i < nfblocks; i++)
xfree(nfbuf[i]);
xfree(nfbuf);
}
cpybin(B, st->B);
xclose(SHIN);
insource = st->insource;
SHIN = st->SHIN;
if (st->OLDSTD != -1)
xclose(OLDSTD), OLDSTD = st->OLDSTD;
if (st->SHOUT != -1)
xclose(SHOUT), SHOUT = st->SHOUT;
if (st->SHDIAG != -1)
xclose(SHDIAG), SHDIAG = st->SHDIAG;
arginp = st->arginp;
onelflg = st->onelflg;
evalp = st->evalp;
evalvec = st->evalvec;
alvecp = st->alvecp;
alvec = st->alvec;
intty = st->intty;
whyles = st->whyles;
gointr = st->gointr;
if (st->HIST != '\0')
HIST = st->HIST;
enterhist = st->enterhist;
cantell = st->cantell;
justpr = st->justpr;
if (st->argv != NULL)
setq(STRargv, st->argv, &shvhed, VAR_READWRITE);
else if (st->av != NULL && *st->av != NULL && adrof(STRargv) != NULL)
unsetv(STRargv);
}
/*
* Source to a unit. If onlyown it must be our file or our group or
* we don't chance it. This occurs on ".cshrc"s and the like.
*/
static void
srcunit(int unit, int onlyown, int hflg, Char **av)
{
struct saved_state st;
st.SHIN = -1; /* st_restore checks this */
if (unit < 0)
return;
if (onlyown) {
struct stat stb;
if (fstat(unit, &stb) < 0) {
xclose(unit);
return;
}
}
/* Does nothing before st_save() because st.SHIN == -1 */
cleanup_push(&st, st_restore);
if (setintr) {
pintr_disabled++;
cleanup_push(&pintr_disabled, disabled_cleanup);
}
/* Save the current state and move us to a new state */
st_save(&st, unit, hflg, NULL, av);
/*
* Now if we are allowing commands to be interrupted, we let ourselves be
* interrupted.
*/
if (setintr) {
cleanup_until(&pintr_disabled);
pintr_disabled++;
cleanup_push(&pintr_disabled, disabled_cleanup);
}
process(0); /* 0 -> blow away on errors */
/* Restore the old state */
cleanup_until(&st);
}
/*ARGSUSED*/
void
goodbye(Char **v, struct command *c)
{
USE(v);
USE(c);
record();
if (loginsh) {
size_t omark;
sigset_t set;
sigemptyset(&set);
signal(SIGQUIT, SIG_IGN);
sigaddset(&set, SIGQUIT);
sigprocmask(SIG_UNBLOCK, &set, NULL);
signal(SIGINT, SIG_IGN);
sigaddset(&set, SIGINT);
signal(SIGTERM, SIG_IGN);
sigaddset(&set, SIGTERM);
signal(SIGHUP, SIG_IGN);
sigaddset(&set, SIGHUP);
sigprocmask(SIG_UNBLOCK, &set, NULL);
phup_disabled = 1;
setintr = 0; /* No interrupts after "logout" */
/* Trap errors inside .logout */
omark = cleanup_push_mark();
if (setexit() == 0) {
if (!(adrof(STRlogout)))
setcopy(STRlogout, STRnormal, VAR_READWRITE);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
#endif
if (adrof(STRhome))
(void) srccat(varval(STRhome), STRsldtlogout);
#ifdef TESLA
do_logout = 1;
#endif /* TESLA */
}
cleanup_pop_mark(omark);
}
exitstat();
}
void
exitstat(void)
{
#ifdef PROF
_mcleanup();
#endif
/*
* Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
* directly because we poke child here. Otherwise we might continue
* unwarrantedly (sic).
*/
child = 1;
xexit(getn(varval(STRstatus)));
}
/*
* in the event of a HUP we want to save the history
*/
void
phup(void)
{
if (loginsh) {
setcopy(STRlogout, STRhangup, VAR_READWRITE);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
#endif
if (adrof(STRhome))
(void) srccat(varval(STRhome), STRsldtlogout);
}
record();
#ifdef POSIXJOBS
/*
* We kill the last foreground process group. It then becomes
* responsible to propagate the SIGHUP to its progeny.
*/
{
struct process *pp, *np;
for (pp = proclist.p_next; pp; pp = pp->p_next) {
np = pp;
/*
* Find if this job is in the foreground. It could be that
* the process leader has exited and the foreground flag
* is cleared for it.
*/
do
/*
* If a process is in the foreground we try to kill
* it's process group. If we succeed, then the
* whole job is gone. Otherwise we keep going...
* But avoid sending HUP to the shell again.
*/
if (((np->p_flags & PFOREGND) != 0) && np->p_jobid != shpgrp) {
np->p_flags &= ~PHUP;
if (killpg(np->p_jobid, SIGHUP) != -1) {
/* In case the job was suspended... */
#ifdef SIGCONT
(void) killpg(np->p_jobid, SIGCONT);
#endif
break;
}
}
while ((np = np->p_friends) != pp);
}
}
#endif /* POSIXJOBS */
xexit(SIGHUP);
}
static Char *jobargv[2] = {STRjobs, 0};
/*
* Catch an interrupt, e.g. during lexical input.
* If we are an interactive shell, we reset the interrupt catch
* immediately. In any case we drain the shell output,
* and finally go through the normal error mechanism, which
* gets a chance to make the shell go away.
*/
int just_signaled; /* bugfix by Michael Bloom (mg@ttidca.TTI.COM) */
void
pintr(void)
{
just_signaled = 1;
pintr1(1);
}
void
pintr1(int wantnl)
{
if (setintr) {
if (pjobs) {
pjobs = 0;
xputchar('\n');
dojobs(jobargv, NULL);
stderror(ERR_NAME | ERR_INTR);
}
}
/* MH - handle interrupted completions specially */
{
if (InsideCompletion)
stderror(ERR_SILENT);
}
/* JV - Make sure we shut off inputl */
{
(void) Cookedmode();
GettingInput = 0;
if (evalvec)
doneinp = 1;
}
drainoline();
#ifdef HAVE_GETPWENT
(void) endpwent();
#endif
/*
* If we have an active "onintr" then we search for the label. Note that if
* one does "onintr -" then we shan't be interruptible so we needn't worry
* about that here.
*/
if (gointr) {
gotolab(gointr);
reset();
}
else if (intty && wantnl) {
if (editing) {
/*
* If we are editing a multi-line input command, and move to
* the beginning of the line, we don't want to trash it when
* we hit ^C
*/
PastBottom();
ClearLines();
ClearDisp();
}
else {
/* xputchar('\n'); *//* Some like this, others don't */
(void) putraw('\r');
(void) putraw('\n');
}
}
stderror(ERR_SILENT);
}
/*
* Process is the main driving routine for the shell.
* It runs all command processing, except for those within { ... }
* in expressions (which is run by a routine evalav in sh.exp.c which
* is a stripped down process), and `...` evaluation which is run
* also by a subset of this code in sh.glob.c in the routine backeval.
*
* The code here is a little strange because part of it is interruptible
* and hence freeing of structures appears to occur when none is necessary
* if this is ignored.
*
* Note that if catch is not set then we will unwind on any error.
* If an end-of-file occurs, we return.
*/
void
process(int catch)
{
jmp_buf_t osetexit;
/* PWP: This might get nuked by longjmp so don't make it a register var */
size_t omark;
volatile int didexitset = 0;
getexit(osetexit);
omark = cleanup_push_mark();
for (;;) {
struct command *t;
int hadhist, old_pintr_disabled;
(void)setexit();
if (didexitset == 0) {
exitset++;
didexitset++;
}
pendjob();
justpr = enterhist; /* execute if not entering history */
if (haderr) {
if (!catch) {
/* unwind */
doneinp = 0;
cleanup_pop_mark(omark);
resexit(osetexit);
reset();
}
haderr = 0;
/*
* Every error is eventually caught here or the shell dies. It is
* at this point that we clean up any left-over open files, by
* closing all but a fixed number of pre-defined files. Thus
* routines don't have to worry about leaving files open due to
* deeper errors... they will get closed here.
*/
closem();
continue;
}
if (doneinp) {
doneinp = 0;
break;
}
if (chkstop)
chkstop--;
if (neednote)
pnote();
if (intty && prompt && evalvec == 0) {
just_signaled = 0;
mailchk();
/*
* Watch for logins/logouts. Next is scheduled commands stored
* previously using "sched." Then execute periodic commands.
* Following that, the prompt precmd is run.
*/
#ifndef HAVENOUTMP
watch_login(0);
#endif /* !HAVENOUTMP */
sched_run();
period_cmd();
precmd();
/*
* If we are at the end of the input buffer then we are going to
* read fresh stuff. Otherwise, we are rereading input and don't
* need or want to prompt.
*/
if (fseekp == feobp && aret == TCSH_F_SEEK)
printprompt(0, NULL);
flush();
setalarm(1);
}
if (seterr) {
xfree(seterr);
seterr = NULL;
}
/*
* Interruptible during interactive reads
*/
if (setintr)
pintr_push_enable(&old_pintr_disabled);
freelex(&paraml);
hadhist = lex(&paraml);
if (setintr)
cleanup_until(&old_pintr_disabled);
cleanup_push(&paraml, lex_cleanup);
/*
* Echo not only on VERBOSE, but also with history expansion. If there
* is a lexical error then we forego history echo.
* Do not echo if we're only entering history (source -h).
*/
if ((hadhist && !seterr && intty && !tellwhat && !Expand && !whyles) ||
(!enterhist && adrof(STRverbose)))
{
int odidfds = didfds;
haderr = 1;
didfds = 0;
prlex(&paraml);
flush();
haderr = 0;
didfds = odidfds;
}
(void) alarm(0); /* Autologout OFF */
alrmcatch_disabled = 1;
/*
* Save input text on the history list if reading in old history, or it
* is from the terminal at the top level and not in a loop.
*
* PWP: entry of items in the history list while in a while loop is done
* elsewhere...
*/
if (enterhist || (catch && intty && !whyles && !tellwhat && !arun))
savehist(&paraml, enterhist > 1);
if (Expand && seterr)
Expand = 0;
/*
* Print lexical error messages, except when sourcing history lists.
*/
if (!enterhist && seterr)
stderror(ERR_OLD);
/*
* If had a history command :p modifier then this is as far as we
* should go
*/
if (justpr)
goto cmd_done;
/*
* If had a tellwhat from twenex() then do
*/
if (tellwhat) {
(void) tellmewhat(&paraml, NULL);
goto cmd_done;
}
alias(&paraml);
#ifdef BSDJOBS
/*
* If we are interactive, try to continue jobs that we have stopped
*/
if (prompt)
continue_jobs(&paraml);
#endif /* BSDJOBS */
/*
* Check to see if the user typed "rm * .o" or something
*/
if (prompt)
rmstar(&paraml);
/*
* Parse the words of the input into a parse tree.
*/
t = syntax(paraml.next, &paraml, 0);
/*
* We cannot cleanup push here, because cd /blah; echo foo
* would rewind t on the chdir error, and free the rest of the command
*/
if (seterr) {
freesyn(t);
stderror(ERR_OLD);
}
postcmd();
/*
* Execute the parse tree From: Michael Schroeder
* <mlschroe@immd4.informatik.uni-erlangen.de> was execute(t, tpgrp);
*/
execute(t, (tpgrp > 0 ? tpgrp : -1), NULL, NULL, TRUE);
freesyn(t);
/*
* Made it!
*/
#ifdef SIG_WINDOW
if (windowchg || (catch && intty && !whyles && !tellwhat)) {
(void) check_window_size(0); /* for window systems */
}
#endif /* SIG_WINDOW */
setcopy(STR_, InputBuf, VAR_READWRITE | VAR_NOGLOB);
cmd_done:
if (cleanup_reset())
cleanup_until(&paraml);
else
haderr = 1;
}
cleanup_pop_mark(omark);
resexit(osetexit);
exitset--;
handle_pending_signals();
}
/*ARGSUSED*/
void
dosource(Char **t, struct command *c)
{
Char *f;
int hflg = 0;
char *file;
USE(c);
t++;
if (*t && eq(*t, STRmh)) {
if (*++t == NULL)
stderror(ERR_NAME | ERR_HFLAG);
hflg++;
}
else if (*t && eq(*t, STRmm)) {
if (*++t == NULL)
stderror(ERR_NAME | ERR_MFLAG);
hflg = 2;
}
f = globone(*t++, G_ERROR);
file = strsave(short2str(f));
cleanup_push(file, xfree);
xfree(f);
t = glob_all_or_error(t);
cleanup_push(t, blk_cleanup);
if ((!srcfile(file, 0, hflg, t)) && (!hflg) && (!bequiet))
stderror(ERR_SYSTEM, file, strerror(errno));
cleanup_until(file);
}
/*
* Check for mail.
* If we are a login shell, then we don't want to tell
* about any mail file unless its been modified
* after the time we started.
* This prevents us from telling the user things he already
* knows, since the login program insists on saying
* "You have mail."
*/
/*
* The AMS version.
* This version checks if the file is a directory, and if so,
* tells you the number of files in it, otherwise do the old thang.
* The magic "+1" in the time calculation is to compensate for
* an AFS bug where directory mtimes are set to 1 second in
* the future.
*/
static void
mailchk(void)
{
struct varent *v;
Char **vp;
time_t t;
int intvl, cnt;
struct stat stb;
int new;
v = adrof(STRmail);
if (v == NULL || v->vec == NULL)
return;
(void) time(&t);
vp = v->vec;
cnt = blklen(vp);
intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
if (intvl < 1)
intvl = 1;
if (chktim + intvl > t)
return;
for (; *vp; vp++) {
char *filename = short2str(*vp);
char *mboxdir = filename;
if (stat(filename, &stb) < 0)
continue;
#if defined(BSDTIMES) || defined(_SEQUENT_)
new = stb.st_mtime > time0.tv_sec;
#else
new = stb.st_mtime > seconds0;
#endif
if (S_ISDIR(stb.st_mode)) {
DIR *mailbox;
int mailcount = 0;
char *tempfilename;
struct stat stc;
tempfilename = xasprintf("%s/new", filename);
if (stat(tempfilename, &stc) != -1 && S_ISDIR(stc.st_mode)) {
/*
* "filename/new" exists and is a directory; you are
* using Qmail.
*/
stb = stc;
#if defined(BSDTIMES) || defined(_SEQUENT_)
new = stb.st_mtime > time0.tv_sec;
#else
new = stb.st_mtime > seconds0;
#endif
mboxdir = tempfilename;
}
if (stb.st_mtime <= chktim + 1 || (loginsh && !new)) {
xfree(tempfilename);
continue;
}
mailbox = opendir(mboxdir);
xfree(tempfilename);
if (mailbox == NULL)
continue;
/* skip . and .. */
if (!readdir(mailbox) || !readdir(mailbox)) {
(void)closedir(mailbox);
continue;
}
while (readdir(mailbox))
mailcount++;
(void)closedir(mailbox);
if (mailcount == 0)
continue;
if (cnt == 1)
xprintf(CGETS(11, 3, "You have %d mail messages.\n"),
mailcount);
else
xprintf(CGETS(11, 4, "You have %d mail messages in %s.\n"),
mailcount, filename);
}
else {
char *type;
if (stb.st_size == 0 || stb.st_atime >= stb.st_mtime ||
(stb.st_atime <= chktim && stb.st_mtime <= chktim) ||
(loginsh && !new))
continue;
type = strsave(new ? CGETS(11, 6, "new ") : "");
cleanup_push(type, xfree);
if (cnt == 1)
xprintf(CGETS(11, 5, "You have %smail.\n"), type);
else
xprintf(CGETS(11, 7, "You have %smail in %s.\n"), type, filename);
cleanup_until(type);
}
}
chktim = t;
}
/*
* Extract a home directory from the password file
* The argument points to a buffer where the name of the
* user whose home directory is sought is currently.
* We return home directory of the user, or NULL.
*/
Char *
gethdir(const Char *home)
{
Char *h;
/*
* Is it us?
*/
if (*home == '\0') {
if ((h = varval(STRhome)) != STRNULL)
return Strsave(h);
else
return NULL;
}
/*
* Look in the cache
*/
if ((h = gettilde(home)) == NULL)
return NULL;
else
return Strsave(h);
}
/*
* Move the initial descriptors to their eventual
* resting places, closing all other units.
*/
void
initdesc(void)
{
#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
nlsclose();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
didfds = 0; /* 0, 1, 2 aren't set up */
(void) close_on_exec(SHIN = dcopy(0, FSHIN), 1);
(void) close_on_exec(SHOUT = dcopy(1, FSHOUT), 1);
(void) close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1);
(void) close_on_exec(OLDSTD = dcopy(SHIN, FOLDSTD), 1);
#ifndef CLOSE_ON_EXEC
didcch = 0; /* Havent closed for child */
#endif /* CLOSE_ON_EXEC */
if (SHDIAG >= 0)
isdiagatty = isatty(SHDIAG);
else
isdiagatty = 0;
if (SHDIAG >= 0)
isoutatty = isatty(SHOUT);
else
isoutatty = 0;
#ifdef NLS_BUGS
#ifdef NLS_CATALOGS
nlsinit();
#endif /* NLS_CATALOGS */
#endif /* NLS_BUGS */
}
void
#ifdef PROF
done(int i)
#else
xexit(int i)
#endif
{
#ifdef TESLA
if (loginsh && do_logout) {
/* this is to send hangup signal to the develcon */
/* we toggle DTR. clear dtr - sleep 1 - set dtr */
/* ioctl will return ENOTTY for pty's but we ignore it */
/* exitstat will run after disconnect */
/* we sleep for 2 seconds to let things happen in */
/* .logout and rechist() */
#ifdef TIOCCDTR
(void) sleep(2);
(void) ioctl(FSHTTY, TIOCCDTR, NULL);
(void) sleep(1);
(void) ioctl(FSHTTY, TIOCSDTR, NULL);
#endif /* TIOCCDTR */
}
#endif /* TESLA */
{
struct process *pp, *np;
pid_t mypid = getpid();
/* Kill all processes marked for hup'ing */
for (pp = proclist.p_next; pp; pp = pp->p_next) {
np = pp;
do
if ((np->p_flags & PHUP) && np->p_jobid != shpgrp &&
np->p_parentid == mypid) {
if (killpg(np->p_jobid, SIGHUP) != -1) {
/* In case the job was suspended... */
#ifdef SIGCONT
(void) killpg(np->p_jobid, SIGCONT);
#endif
break;
}
}
while ((np = np->p_friends) != pp);
}
}
untty();
#ifdef NLS_CATALOGS
/*
* We need to call catclose, because SVR4 leaves symlinks behind otherwise
* in the catalog directories. We cannot close on a vforked() child,
* because messages will stop working on the parent too.
*/
if (child == 0)
nlsclose();
#endif /* NLS_CATALOGS */
#ifdef WINNT_NATIVE
nt_cleanup();
#endif /* WINNT_NATIVE */
_exit(i);
}
#ifndef _PATH_DEFPATH
static Char **
defaultpath(void)
{
char *ptr;
Char **blk, **blkp;
struct stat stb;
blkp = blk = xmalloc(sizeof(Char *) * 10);
#ifndef NODOT
# ifndef DOTLAST
*blkp++ = Strsave(STRdot);
# endif
#endif
#define DIRAPPEND(a) \
if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
*blkp++ = SAVE(ptr)
#ifdef _PATH_LOCAL
DIRAPPEND(_PATH_LOCAL);
#endif
#ifdef _PATH_USRUCB
DIRAPPEND(_PATH_USRUCB);
#endif
#ifdef _PATH_USRBSD
DIRAPPEND(_PATH_USRBSD);
#endif
#ifdef _PATH_BIN
DIRAPPEND(_PATH_BIN);
#endif
#ifdef _PATH_USRBIN
DIRAPPEND(_PATH_USRBIN);
#endif
#undef DIRAPPEND
#ifndef NODOT
# ifdef DOTLAST
*blkp++ = Strsave(STRdot);
# endif
#endif
*blkp = NULL;
return (blk);
}
#endif
static void
record(void)
{
if (!fast) {
recdirs(NULL, adrof(STRsavedirs) != NULL);
rechist(NULL, adrof(STRsavehist) != NULL);
}
displayHistStats("Exiting"); /* no-op unless DEBUG_HIST */
}
/*
* Grab the tty repeatedly, and give up if we are not in the correct
* tty process group.
*/
int
grabpgrp(int fd, pid_t desired)
{
struct sigaction old;
pid_t pgrp;
size_t i;
for (i = 0; i < 100; i++) {
if ((pgrp = tcgetpgrp(fd)) == -1)
return -1;
if (pgrp == desired)
return 0;
(void)sigaction(SIGTTIN, NULL, &old);
(void)signal(SIGTTIN, SIG_DFL);
(void)kill(0, SIGTTIN);
(void)sigaction(SIGTTIN, &old, NULL);
}
errno = EPERM;
return -1;
}
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