2.11BSD/src/bin/tcsh/sh.c
/* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/sh.c,v 3.0 1991/07/04 23:34:26 christos Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include "config.h"
#if !defined(lint) && !defined(pdp11)
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#if !defined(lint) && !defined(pdp11)
static char *rcsid()
{ return "$Id: sh.c,v 3.0 1991/07/04 23:34:26 christos Exp $"; }
#endif
#include "sh.h"
#include "ed.h"
extern bool MapsAreInited;
extern bool NLSMapsAreInited;
extern bool NoNLSRebind;
/*
* 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
*/
#ifdef TESLA
static int do_logout;
#endif /* TESLA */
Char *dumphist[] = {STRhsto, STRmh, 0, 0};
Char *loadhist[] = {STRsource, STRmh, STRhstf, 0};
#ifdef CSHDIRS
Char *loaddirs[] = {STRsource, STRdirfile, 0};
bool dflag = 0;
#endif
#if defined(convex) || defined(__convex__)
bool use_fork = 0; /* use fork() instead of vfork()? */
#endif
int nofile = 0;
bool reenter = 0;
bool nverbose = 0;
bool nexececho = 0;
bool quitit = 0;
bool fast = 0;
bool batch = 0;
bool mflag = 0;
bool prompt = 1;
bool enterhist = 0;
bool tellwhat = 0;
time_t t_period;
extern char **environ;
static int srccat __P((Char *, Char *));
static int srcfile __P((char *, bool, bool));
static sigret_t phup __P((int));
static void srcunit __P((int, bool, bool));
static void mailchk __P((void));
static Char **d_path __P((void));
int
main(argc, argv)
int argc;
char **argv;
{
register Char *cp, *cp2;
register char *tcp, *ttyn;
register int f;
register char **tempv;
#ifdef BSDSIGS
sigvec_t osv;
#endif /* BSDSIGS */
settimes(); /* Immed. estab. timing base */
#ifdef TESLA
do_logout = 0;
#endif /* TESLA */
osinit(); /* Os dependent initialization */
/*
* Initialize non constant strings
*/
#ifdef _PATH_BSHELL
STR_BSHELL = SAVE(_PATH_BSHELL);
#endif
#ifdef _PATH_CSHELL
STR_SHELLPATH = SAVE(_PATH_CSHELL);
#endif
#ifdef _PATH_TCSHELL
STR_SHELLPATH = SAVE(_PATH_TCSHELL);
#endif
STR_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
STR_WORD_CHARS = SAVE(WORD_CHARS);
HIST = '!';
HISTSUB = '^';
word_chars = STR_WORD_CHARS;
bslash_quote = 0; /* PWP: do tcsh-style backslash quoting? */
tempv = argv;
if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
quitit = 1;
uid = getuid();
gid = getgid();
/*
* We are a login shell if: 1. we were invoked as -<something> and we had
* no arguments 2. or we were invoked only with the -l flag
*/
loginsh = (**tempv == '-' && argc == 1) || (argc == 2 &&
tempv[1][0] == '-' && tempv[1][1] == 'l' &&
tempv[1][2] == '\0');
if (loginsh && **tempv != '-') {
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
for (tcp = *tempv; *tcp++;);
for (tcp--; tcp >= *tempv; tcp--)
tcp[1] = tcp[0];
*++tcp = '-';
argc--;
}
if (loginsh)
(void) time(&chktim);
AsciiOnly = 1;
NoNLSRebind = getenv("NOREBIND") != NULL;
#ifdef NLS
(void) setlocale(LC_ALL, "");
{
int k;
for (k = 0200; k <= 0377 && !Isprint(k); k++);
AsciiOnly = k > 0377;
}
#else
AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
#endif /* NLS */
if (MapsAreInited && !NLSMapsAreInited)
ed_INLSMaps();
/*
* Initialize for periodic command intervals. Also, initialize the dummy
* tty list for login-watch.
*/
(void) time(&t_period);
initwatch();
/*
* 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();
/*
* Get and set the tty now
*/
if (ttyn = ttyname(SHIN)) {
/*
* 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)
set(STRtty, cp = SAVE(ttyn + 5));
else
set(STRtty, cp = SAVE(ttyn));
}
else
set(STRtty, cp = SAVE(""));
/*
* 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 comp_r might re-arange things wrong.
*/
#ifdef AUTOLOGOUT
if (loginsh || (uid == 0)) {
if (*cp) {
/* only for login shells or root and we must have a tty */
if ((cp2 = Strrchr(cp, (Char) '/')) != NULL) {
cp = cp2 + 1;
}
if (!((Strncmp(cp, STRtty, 3) == 0) &&
(cp[3] >= 'p' && cp[3] <= 'u'))) {
if (getenv("DISPLAY") == NULL) {
/* NOT on X window shells */
set(STRa_logout, Strsave(STRdflt_auto_logout));
}
}
}
}
#endif /* AUTOLOGOUT */
(void) sigset(SIGALRM, alrmcatch);
set(STRstatus, Strsave(STR0));
fix_version(); /* publish the shell version */
/*
* set the shell-level var to 1 or increment it.
*/
if ((tcp = getenv("SHLVL")) != NULL) {
Char buff[BUFSIZ];
Itoa(1 + atoi(tcp), buff);
set(STRshlvl, Strsave(buff));
Setenv(STRSHLVL, buff);
}
else {
set(STRshlvl, SAVE("1"));
Setenv(STRSHLVL, str2short("1"));
}
if ((tcp = getenv("HOME")) != NULL)
cp = SAVE(tcp);
else
cp = NOSTR;
if (cp == NOSTR)
fast = 1; /* No home -> can't read scripts */
else
set(STRhome, cp);
dinit(cp); /* dinit thinks that HOME == cwd in a login
* shell */
/*
* Grab other useful things from the environment. Should we grab
* everything??
*/
if ((tcp = getenv("LOGNAME")) != NULL || (tcp = getenv("USER")) != NULL)
set(STRuser, SAVE(tcp));
if ((tcp = getenv("TERM")) != NULL)
set(STRterm, SAVE(tcp));
/*
* set usefull environment things for the user
*/
{
Char buff[BUFSIZ];
#ifdef apollo
int oid = getoid();
Itoa(oid, buff);
set(STRoid, Strsave(buff));
#endif /* apollo */
Itoa(uid, buff);
set(STRuid, Strsave(buff));
Itoa(gid, buff);
set(STRgid, Strsave(buff));
}
/*
* 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 */
Setenv(STRHST, str2short(cbuff));
}
else
Setenv(STRHST, str2short("unknown"));
}
/*
* HOSTTYPE, too. Just set it again.
*/
Setenv(STRHSTTYPE, GetHostType());
#ifdef apollo
if ((tcp = getenv("SYSTYPE")) == NULL)
tcp = "bsd4.3";
Setenv(STRSYSTYPE, str2short(tcp));
#endif /* apollo */
/*
* set editing on by default, unless running under Emacs as an inferior
* shell.
*/
if ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0) {
/* not running under Emacs */
/* The 'edit' variable is either set or unset. It doesn't */
/* need a value. Making it 'emacs' might be confusing. */
set(STRedit, Strsave(STRNULL));
editing = 1;
}
else { /* running under Emacs */
/* we don't set edit to anything */
editing = 0;
}
/*
* still more mutability: make the complete routine automatically add the
* suffix of file names...
*/
set(STRaddsuffix, Strsave(STRNULL));
/*
* Re-initialize path if set in environment
*/
if ((tcp = getenv("PATH")) == NULL)
set1(STRpath, d_path(), &shvhed);
else
importpath(SAVE(tcp));
set(STRshell, Strsave(STR_SHELLPATH));
doldol = putn((int) getpid()); /* For $$ */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
/*
* 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.
*/
#ifdef BSDSIGS
/* parents interruptibility */
(void) mysigvec(SIGINT, NULL, &osv);
parintr = (sigret_t(*) ()) osv.sv_handler;
(void) mysigvec(SIGTERM, NULL, &osv);
parterm = (sigret_t(*) ()) osv.sv_handler;
#else /* BSDSIGS */
parintr = signal(SIGINT, SIG_IGN); /* parents interruptibility */
(void) sigset(SIGINT, parintr); /* ... restore */
parterm = signal(SIGTERM, SIG_IGN); /* parents terminability */
(void) sigset(SIGTERM, parterm); /* ... restore */
#endif /* BSDSIGS */
if (loginsh) {
(void) signal(SIGHUP, phup); /* exit processing on HUP */
#ifdef SIGXCPU
(void) signal(SIGXCPU, phup); /* ...and on XCPU */
#endif /* SIGXCPU */
#ifdef SIGXFSZ
(void) signal(SIGXFSZ, phup); /* ...and on XFSZ */
#endif /* SIGXFSZ */
}
#ifdef TCF
/* Enable process migration on ourselves and our progeny */
(void) signal(SIGMIGRATE, SIG_DFL);
#endif /* TCF */
/*
* 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++;
arginp = SAVE(tempv[0]);
/*
* * Give an error on -c arguments that end in * backslash to
* ensure that you don't make * nonportable csh scripts.
*/
{
register Char *cp;
register int count;
cp = arginp + Strlen(arginp);
count = 0;
while (cp > arginp && *--cp == '\\')
++count;
if ((count & 1) != 0) {
exiterr = 1;
stderror(ERR_ARGC);
}
}
prompt = 0;
nofile = 1;
break;
#ifdef CSHDIRS
case 'd': /* -d Force load of ~/.cshdirs */
dflag++;
break;
#endif
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;
#if defined(__convex__) || defined(convex)
case 'F': /* Undocumented flag */
/*
* This will cause children to be created using fork instead of
* vfork.
*/
use_fork = 1;
break;
#endif
} 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 = open(tempv[0], O_RDONLY);
if (nofile < 0) {
child = 1; /* So this ... */
/* ... doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
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;
}
#ifdef FIOCLEX
(void) ioctl(SHIN, FIOCLEX, NULL);
#endif
prompt = 0;
/* argc not used any more */ tempv++;
}
/*
* 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;
if (intty || (intact && isatty(SHOUT))) {
if (!batch && (uid != geteuid() || gid != getegid())) {
errno = EACCES;
child = 1; /* So this ... */
/* ... doesn't return */
stderror(ERR_SYSTEM, "tcsh", strerror(errno));
}
}
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);
/*
* Set up the prompt.
*/
if (prompt) {
set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymarrow));
/* that's a meta-questionmark */
set(STRp_2, Strsave(STRmquestion));
set(STRp_3, Strsave(STRCORRECT));
}
/*
* If we are an interactive shell, then start fiddling with the signals;
* this is a tricky game.
*/
shpgrp = mygetpgrp();
opgrp = tpgrp = -1;
if (setintr) {
**argv = '-';
if (!quitit) /* Wary! */
(void) signal(SIGQUIT, SIG_IGN);
(void) sigset(SIGINT, pintr);
(void) sighold(SIGINT);
(void) signal(SIGTERM, SIG_IGN);
if (quitit == 0 && arginp == 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;
retry:
#ifdef BSDJOBS /* if we have tty job control */
if ((tpgrp = tcgetpgrp(f)) != -1) {
if (tpgrp != shpgrp) {
sigret_t(*old) () = signal(SIGTTIN, SIG_DFL);
(void) kill(0, SIGTTIN);
(void) signal(SIGTTIN, old);
goto retry;
}
/*
* 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
#ifdef FIOCLEX
(void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
#else /* FIOCLEX */
(void) dcopy(f, FSHTTY);
#endif /* FIOCLEX */
}
else
tpgrp = -1;
}
if (tpgrp == -1) {
notty:
xprintf("Warning: no access to tty (%s).\n", strerror(errno));
xprintf("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 == SIG_DFL))
setintr = 1;
(void) sigset(SIGCHLD, pchild); /* while signals not ready */
/*
* Set an exit here in case of an interrupt or error reading the shell
* start-up scripts.
*/
reenter = setexit(); /* PWP */
haderr = 0; /* In case second time through */
if (!fast && reenter == 0) {
/* Will have value(STRhome) here because set fast if don't */
{
int osetintr = setintr;
#ifdef BSDSIGS
sigmask_t omask = sigblock(sigmask(SIGINT));
#else
sighold(SIGINT);
#endif
setintr = 0;
#ifdef _PATH_DOTCSHRC
(void) srcfile(_PATH_DOTCSHRC, 0, 0);
#endif
if (!fast && !arginp && !onelflg)
dohash();
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0);
#endif
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
setintr = osetintr;
}
#ifdef LOGINFIRST
if (loginsh)
(void) srccat(value(STRhome), STRd_login);
#endif
/* upward compat. */
if (!srccat(value(STRhome), STRd_tcshrc))
(void) srccat(value(STRhome), STRd_cshrc);
if (!fast && !arginp && !onelflg && !havhash)
dohash();
/*
* Source history before .login so that it is available in .login
*/
dosource(loadhist);
#ifndef LOGINFIRST
if (loginsh)
(void) srccat(value(STRhome), STRd_login);
#endif
#ifdef CSHDIRS
/*
* if dflag then source ~/.cshdirs, but if fast ALWAYS skip the dirs
* restoring. (dflag used to get non-login shells to source the save
* dirs file). Of course, ~/.cshdirs must exist. -strike
*/
{
extern int bequiet; /* make dirs shut up */
Char cshd[BUFSIZ];
struct stat st;
(void) Strcpy(cshd, value(STRhome));
(void) Strcat(cshd, STRs_dirs);
if (!stat(short2str(cshd), &st) &&
(dflag || loginsh) && !fast) {
bequiet = 1;
dosource(loaddirs);
bequiet = 0;
}
}
#endif
}
/* Initing AFTER .cshrc is the Right Way */
if (intty && !arginp) { /* PWP setup stuff */
ed_I(); /* 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);
/*
* 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);
/*
* Mop-up.
*/
if (intty) {
if (loginsh) {
xprintf("logout\n");
(void) close(SHIN);
child = 1;
#ifdef TESLA
do_logout = 1;
#endif /* TESLA */
goodbye();
}
else {
xprintf("exit\n");
}
}
#ifdef CSHDIRS
/*
* save the directory stack -strike
*/
recdirs();
#endif
rechist();
exitstat();
return (0);
}
void
untty()
{
#ifdef BSDJOBS
if (tpgrp > 0) {
(void) setpgid(0, opgrp);
(void) tcsetpgrp(FSHTTY, opgrp);
(void) resetdisc(FSHTTY);
}
#endif /* BSDJOBS */
}
void
importpath(cp)
Char *cp;
{
register int i = 0;
register Char *dp;
register Char **pv;
int c;
for (dp = cp; *dp; dp++)
if (*dp == ':')
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 = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **));
dp = cp;
i = 0;
if (*dp)
for (;;) {
if ((c = *dp) == ':' || c == 0) {
*dp = 0;
pv[i++] = Strsave(*cp ? cp : STRdot);
if (c) {
cp = dp + 1;
*dp = ':';
}
else
break;
}
dp++;
}
pv[i] = 0;
set1(STRpath, pv, &shvhed);
}
/*
* Source to the file which is the catenation of the argument names.
*/
static int
srccat(cp, dp)
Char *cp, *dp;
{
if (cp[0] == '/' && cp[1] == '\0')
return srcfile(short2str(dp), mflag ? 0 : 1, 0);
else {
register Char *ep = Strspl(cp, dp);
char *ptr = short2str(ep);
xfree((ptr_t) ep);
return srcfile(ptr, mflag ? 0 : 1, 0);
}
}
/*
* Source to a file putting the file descriptor in a safe place (> 2).
*/
static int
srcfile(f, onlyown, flag)
char *f;
bool onlyown, flag;
{
register int unit;
if ((unit = open(f, O_RDONLY)) == -1)
return 0;
unit = dmove(unit, -1);
#ifdef FIOCLEX
(void) ioctl(unit, FIOCLEX, NULL);
#endif
srcunit(unit, onlyown, flag);
return 1;
}
/*
* 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.
*/
int insource;
static void
srcunit(unit, onlyown, hflg)
register int unit;
bool onlyown, hflg;
{
/*
* PWP: this is arranged like this so that an optimizing comp_r won't go
* and put things like oSHIN in a register that longjmp() restores. The
* problem is that on my Sun 3/50, gcc will put oSHIN in a register. That
* would be OK, but setjmp() saves ALL of the registers and longjmp()
* restores ALL of them, thus if you do a setjmp(), set oSHIN to something
* (like SHIN), then do a longjmp(), the value of oSHIN will magically
* become -1 again.
*
* Perhaps setjmp() should only save the stack pointer, frame pointer, and
* program counter...
*/
/* We have to push down a lot of state here */
/* All this could go into a structure */
int oSHIN = -1, oldintty = intty, oinsource = insource;
struct whyle *oldwhyl = whyles;
Char *ogointr = gointr, *oarginp = arginp;
Char *oevalp = evalp, **oevalvec = evalvec;
int oonelflg = onelflg;
bool oenterhist = enterhist;
char OHIST = HIST;
bool otell = cantell;
struct Bin saveB;
#ifdef BSDSIGS
volatile sigmask_t omask = (sigmask_t) 0;
#endif
jmp_buf oldexit;
/* The (few) real local variables */
int my_reenter;
if (unit < 0)
return;
if (didfds)
donefds();
if (onlyown) {
struct stat stb;
if (fstat(unit, &stb) < 0
/* || (stb.st_uid != uid && stb.st_gid != gid) */
) {
(void) close(unit);
return;
}
}
/*
* There is a critical section here while we are pushing down the input
* stream since we have stuff in different structures. If we weren't
* careful an interrupt could corrupt SHIN's Bin structure and kill the
* shell.
*
* We could avoid the critical region by grouping all the stuff in a single
* structure and pointing at it to move it all at once. This is less
* efficient globally on many variable references however.
*/
insource = 1;
getexit(oldexit);
if (setintr)
#ifdef BSDSIGS
omask = sigblock(sigmask(SIGINT));
#else
(void) sighold(SIGINT);
#endif
/*
* Bugfix for running out of memory by: Jak Kirman
* <jak%cs.brown.edu@RELAY.CS.NET>. Solution: pay attention to what
* setexit() is returning because my_reenter _may_ be in a register, and
* thus restored to 0 on a longjump(). (PWP: insert flames about
* comp_r-dependant code here) PWP: THANKS LOTS !!!
*/
/* Setup the new values of the state stuff saved above */
copy((char *) &(saveB), (char *) &B, sizeof(B));
fbuf = NULL;
fseekp = feobp = fblocks = 0;
oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0;
intty = isatty(SHIN), whyles = 0, gointr = 0;
evalvec = 0;
evalp = 0;
enterhist = hflg;
if (enterhist)
HIST = '\0';
/*
* Now if we are allowing commands to be interrupted, we let ourselves be
* interrupted.
*/
if (setintr)
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
settell();
/* PWP: think of this as like a LISP (unwind-protect ...) */
/* thanks to Diana Smetters for pointing out how this _should_ be written */
if ((my_reenter = setexit()) == 0) {
process(0); /* 0 -> blow away on errors */
}
if (setintr)
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
if (oSHIN >= 0) {
register int i;
/* We made it to the new state... free up its storage */
/* This code could get run twice but xfree doesn't care */
for (i = 0; i < fblocks; i++)
xfree((ptr_t) fbuf[i]);
xfree((ptr_t) fbuf);
/* Reset input arena */
copy((char *) &B, (char *) &(saveB), sizeof(B));
(void) close(SHIN), SHIN = oSHIN;
arginp = oarginp, onelflg = oonelflg;
evalp = oevalp, evalvec = oevalvec;
intty = oldintty, whyles = oldwhyl, gointr = ogointr;
if (enterhist)
HIST = OHIST;
enterhist = oenterhist;
cantell = otell;
}
resexit(oldexit);
/*
* If process reset() (effectively an unwind) then we must also unwind.
*/
if (my_reenter)
stderror(ERR_SILENT);
insource = oinsource;
}
void
rechist()
{
Char buf[BUFSIZ];
int fp, ftmp, oldidfds;
if (!fast) {
if (value(STRsvhist)[0] == '\0')
return;
(void) Strcpy(buf, value(STRhome));
(void) Strcat(buf, STRs_hist);
fp = creat(short2str(buf), 0600);
if (fp == -1)
return;
oldidfds = didfds;
didfds = 0;
ftmp = SHOUT;
SHOUT = fp;
(void) Strcpy(buf, value(STRsvhist));
dumphist[2] = buf;
dohist(dumphist);
(void) close(fp);
SHOUT = ftmp;
didfds = oldidfds;
}
}
void
goodbye()
{
rechist();
#ifdef CSHDIRS
recdirs();
#endif
if (loginsh) {
(void) signal(SIGQUIT, SIG_IGN);
(void) sigset(SIGINT, SIG_IGN);
(void) signal(SIGTERM, SIG_IGN);
setintr = 0; /* No interrupts after "logout" */
if (!(adrof(STRlogout)))
set(STRlogout, STRnormal);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0);
#endif
if (adrof(STRhome))
(void) srccat(value(STRhome), STRs_logout);
#ifdef TESLA
do_logout = 1;
#endif /* TESLA */
}
exitstat();
}
void
exitstat()
{
#ifdef PROF
monitor(0);
#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(value(STRstatus)));
}
/*
* in the event of a HUP we want to save the history
*/
static sigret_t
phup(i)
int i;
{
rechist();
#ifdef CSHDIRS
/*
* save the directory stack on HUP - strike
*/
recdirs();
#endif
xexit(i);
#ifndef SIGVOID
return (i);
#endif
}
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) */
sigret_t
pintr(i)
int i;
{
just_signaled = 1;
pintr1(1);
#ifndef SIGVOID
return (i);
#endif
}
void
pintr1(wantnl)
bool wantnl;
{
register Char **v;
#ifdef BSDSIGS
sigmask_t omask;
#endif
#ifdef BSDSIGS
omask = sigblock((sigmask_t) 0);
#endif
if (setintr) {
#ifdef BSDSIGS
(void) sigsetmask(omask & ~sigmask(SIGINT));
#else
(void) sigrelse(SIGINT);
#endif
if (pjobs) {
pjobs = 0;
xprintf("\n");
dojobs(jobargv);
stderror(ERR_NAME | ERR_INTR);
}
}
/* JV - Make sure we shut off inputl */
{
extern Char GettingInput;
(void) Cookedmode();
GettingInput = 0;
}
#ifdef BSDSIGS
(void) sigsetmask(omask & ~sigmask(SIGCHLD));
#else
if (setintr)
(void) sighold(SIGINT);
(void) sigrelse(SIGCHLD);
#endif
draino();
(void) endpwent();
/*
* 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) {
search(T_GOTO, 0, gointr);
timflg = 0;
if (v = pargv)
pargv = 0, blkfree(v);
if (v = gargv)
gargv = 0, blkfree(v);
reset();
}
else if (intty && wantnl) {
/* xprintf("\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.
*/
struct command *savet = NULL;
void
process(catch)
bool catch;
{
extern char Expand;
jmp_buf osetexit;
/* PWP: This might get nuked my longjmp so don't make it a register var */
struct command *t = savet;
savet = NULL;
getexit(osetexit);
for (;;) {
pendjob();
paraml.next = paraml.prev = ¶ml;
paraml.word = STRNULL;
(void) setexit();
justpr = enterhist; /* execute if not entering history */
/*
* Interruptible during interactive reads
*/
if (setintr)
#ifdef BSDSIGS
(void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT));
#else
(void) sigrelse(SIGINT);
#endif
/*
* For the sake of reset()
*/
freelex(¶ml);
if (savet)
freesyn(savet), savet = NULL;
if (haderr) {
if (!catch) {
/* unwind */
doneinp = 0;
savet = t;
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) {
mailchk();
/*
* Watch for logins/logouts. Next is scheduled commands stored
* previously using "sched." Then execute periodic commands.
* Following that, the prompt precmd is run.
*/
watch_login();
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)
printprompt(0, NULL);
flush();
setalarm();
}
if (seterr) {
xfree((ptr_t) seterr);
seterr = NULL;
}
/*
* Echo not only on VERBOSE, but also with history expansion. If there
* is a lexical error then we forego history echo.
*/
if (lex(¶ml) && !seterr && intty && !tellwhat && !Expand ||
adrof(STRverbose)) {
haderr = 1;
prlex(¶ml);
haderr = 0;
}
(void) alarm(0); /* Autologout OFF */
/*
* The parser may lose space if interrupted.
*/
if (setintr)
#ifdef BSDSIGS
(void) sigblock(sigmask(SIGINT));
#else
(void) sighold(SIGINT);
#endif
/*
* 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)
savehist(¶ml);
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)
reset();
/*
* If had a tellwhat from twenex() then do
*/
if (tellwhat) {
tellmewhat(¶ml);
reset();
}
alias(¶ml);
#ifdef BSDJOBS
/*
* If we are interactive, try to continue jobs that we have stopped
*/
if (prompt)
con_jobs(¶ml);
#endif /* BSDJOBS */
/*
* Check to see if the user typed "rm * .o" or something
*/
if (prompt)
rmstar(¶ml);
/*
* Parse the words of the input into a parse tree.
*/
savet = syntax(paraml.next, ¶ml, 0);
if (seterr)
stderror(ERR_OLD);
/*
* Execute the parse tree From: Michael Schroeder
* <mlschroe@immd4.informatik.uni-erlangen.de> was execute(t, tpgrp);
*/
execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
/*
* Made it!
*/
freelex(¶ml);
freesyn(savet), savet = NULL;
#ifdef SIG_WINDOW
if (catch && intty && !whyles && !tellwhat)
window_change(0); /* for window systems */
#endif /* SIG_WINDOW */
}
savet = t;
resexit(osetexit);
}
void
dosource(t)
register Char **t;
{
register Char *f;
bool hflg = 0;
Char buf[BUFSIZ];
t++;
if (*t && eq(*t, STRmh)) {
if (*++t == NOSTR)
stderror(ERR_NAME | ERR_HFLAG);
hflg++;
}
(void) Strcpy(buf, *t);
f = globone(buf, G_ERROR);
(void) strcpy((char *) buf, short2str(f));
xfree((ptr_t) f);
if (!srcfile((char *) buf, 0, hflg) && !hflg)
stderror(ERR_SYSTEM, (char *) buf, strerror(errno));
}
/*
* 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."
*/
static void
mailchk()
{
register struct varent *v;
register Char **vp;
time_t t;
int intvl, cnt;
struct stat stb;
bool new;
v = adrof(STRmail);
if (v == 0)
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++) {
if (stat(short2str(*vp), &stb) < 0)
continue;
#if defined(BSDTIMES) || defined(_SEQUENT_)
new = stb.st_mtime > time0.tv_sec;
#else
new = stb.st_mtime > time0;
#endif
if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
(stb.st_atime < chktim && stb.st_mtime < chktim) ||
loginsh && !new)
continue;
if (cnt == 1)
xprintf("You have %smail.\n", new ? "new " : "");
else
xprintf("%s in %s.\n", new ? "New mail" : "Mail",
short2str(*vp));
}
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 write the home directory of the user back there.
*/
int
gethdir(home)
Char *home;
{
Char *h;
/*
* Is it us?
*/
if (*home == '\0') {
if (h = value(STRhome)) {
(void) Strcpy(home, h);
return 0;
}
else
return 1;
}
/*
* Look in the cache
*/
if ((h = gettilde(home)) == NULL)
return 1;
else {
(void) Strcpy(home, h);
return 0;
}
}
/*
* Move the initial descriptors to their eventual
* resting places, closing all other units.
*/
void
initdesc()
{
didfds = 0; /* 0, 1, 2 aren't set up */
#ifdef FIOCLEX
(void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
(void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
(void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, NULL);
(void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);
#else
didcch = 0; /* Havent closed for child */
SHIN = dcopy(0, FSHIN);
SHOUT = dcopy(1, FSHOUT);
isoutatty = isatty(SHOUT);
SHDIAG = dcopy(2, FSHDIAG);
isdiagatty = isatty(SHDIAG);
OLDSTD = dcopy(SHIN, FOLDSTD);
#endif
closem();
}
void
#ifdef PROF
done(i)
#else
xexit(i)
#endif
int i;
{
#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 */
untty();
_exit(i);
}
static Char **
d_path()
{
char *ptr;
Char **blk, **blkp;
struct stat stb;
blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
#ifndef DOTLAST
*blkp++ = Strsave(STRdot);
#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
#ifdef DOTLAST
*blkp++ = Strsave(STRdot);
#endif
*blkp = NULL;
return (blk);
}