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irix-657m-src/eoe/cmd/tcsh/sh.c
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/* $Header: /proj/irix6.5.7m/isms/eoe/cmd/tcsh/RCS/sh.c,v 1.4 1994/05/16 20:20:48 sas 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.
*/
#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 */
RCSID("$Id: sh.c,v 1.4 1994/05/16 20:20:48 sas Exp $")
#include "tc.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
*/
jmp_buf_t reslab;
sigret_t (*parintr) () = 0; /* Parents interrupt catch */
sigret_t (*parterm) () = 0; /* Parents terminate catch */
#ifdef TESLA
int do_logout;
#endif /* TESLA */
bool 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 nofile = 0;
static bool reenter = 0;
static bool nverbose = 0;
static bool nexececho = 0;
static bool quitit = 0;
static bool rdirs = 0;
bool fast = 0;
static bool batch = 0;
static bool mflag = 0;
static bool prompt = 1;
static int enterhist = 0;
bool tellwhat = 0;
time_t t_period;
Char *ffile = NULL;
bool dolzero = 0;
static time_t chktim; /* Time mail last checked */
#ifdef sgi
int FDIN = BAD_FD;
char *S_devfd = "/dev/fd/";
#endif
extern char **environ;
static int srccat __P((Char *, Char *));
static int srcfile __P((char *, bool, int, Char **));
static sigret_t phup __P((int));
static void srcunit __P((int, bool, int, Char **));
static void mailchk __P((void));
static Char **defaultpath __P((void));
int
main(argc, argv)
int argc;
char **argv;
{
register Char *cp;
#ifdef AUTOLOGOUT
register Char *cp2;
#endif
register char *tcp, *ttyn;
register int f;
register char **tempv;
#ifdef BSDSIGS
sigvec_t osv;
#endif /* BSDSIGS */
#ifdef MALLOC_TRACE
mal_setstatsfile(fdopen(dup2(open("/tmp/tcsh.trace",
O_WRONLY|O_CREAT, 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 = open(_PATH_DEVNULL, O_RDONLY)) == -1 &&
(f = open("/", O_RDONLY)) == -1)
exit(1);
while (f < 3);
(void) close(f);
}
osinit(); /* Os dependent initialization */
/*
* 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_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? */
/* Default history size to 100 */
set(STRhistory, SAVE("100"), VAR_READWRITE);
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();
#ifdef OREO
/*
* 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');
#else
/*
* 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');
#endif
#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 != '-') {
/*
* Mangle the argv space
*/
tempv[1][0] = '\0';
tempv[1][1] = '\0';
tempv[1] = NULL;
for (tcp = *tempv; *tcp++;)
continue;
for (tcp--; tcp >= *tempv; tcp--)
tcp[1] = tcp[0];
*++tcp = '-';
argc--;
}
#ifdef sgi
if (loginsh) {
(void) time(&chktim);
set(STRloginsh, Strsave(STRNULL), VAR_READWRITE);
} else {
/*
* Make a scan of the argument list to see if /dev/fd
* is in the path. If so, we need to make sure that
* we don't close the fd during our initialization of
* the descriptor table.
*/
int ac;
char **aav, *cp;
for (ac = argc - 1, aav = argv + 1; (ac > 0) && aav[0][0] == '-';
aav++, ac--) {
/* iterate through argument list */
cp = &aav[0][1];
while (*cp) {
switch (*cp) {
case 'c':
case 'i':
case 's':
case 't':
ac = 0; /* done */
break;
}
cp++;
}
}
if (ac > 0) {
if (!strncmp(aav[0], S_devfd, 8 /*XXX*/)) {
FDIN = atoi(&aav[0][8]);
}
}
}
#else
if (loginsh) {
(void) time(&chktim);
set(STRloginsh, Strsave(STRNULL), VAR_READWRITE);
}
#endif
AsciiOnly = 1;
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 */
{
int k;
for (k = 0200; k <= 0377 && !Isprint(k); k++)
continue;
AsciiOnly = k > 0377;
}
#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 = (char *) ttyname(SHIN);
(void) close(SHIN);
SHIN = open(ttyn, O_RDWR);
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();
/*
* 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)
set(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE);
else
set(STRtty, cp = SAVE(ttyn), VAR_READWRITE);
}
else
set(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
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(STRautologout, Strsave(STRdefautologout),
VAR_READWRITE);
}
}
}
}
#endif /* AUTOLOGOUT */
(void) sigset(SIGALRM, alrmcatch);
set(STRstatus, Strsave(STR0), VAR_READWRITE);
fix_version(); /* publish the shell version */
/*
* Publish the selected echo style
*/
#if ECHO_STYLE == NONE_ECHO
set(STRecho_style, Strsave(STRnone), VAR_READWRITE);
#endif /* ECHO_STYLE == NONE_ECHO */
#if ECHO_STYLE == BSD_ECHO
set(STRecho_style, Strsave(STRbsd), VAR_READWRITE);
#endif /* ECHO_STYLE == BSD_ECHO */
#if ECHO_STYLE == SYSV_ECHO
set(STRecho_style, Strsave(STRsysv), VAR_READWRITE);
#endif /* ECHO_STYLE == SYSV_ECHO */
#if ECHO_STYLE == BOTH_ECHO
set(STRecho_style, Strsave(STRboth), VAR_READWRITE);
#endif /* ECHO_STYLE == BOTH_ECHO */
/*
* increment the shell level.
*/
shlvl(1);
if ((tcp = getenv("HOME")) != NULL)
cp = quote(SAVE(tcp));
else
cp = NULL;
if (cp == NULL)
fast = 1; /* No home -> can't read scripts */
else
set(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;
Char buff[BUFSIZE];
struct passwd *pw;
#ifdef apollo
int oid = getoid();
Itoa(oid, buff);
set(STRoid, Strsave(buff));
#endif /* apollo */
Itoa(uid, buff);
set(STRuid, Strsave(buff), VAR_READWRITE);
Itoa(gid, buff);
set(STRgid, Strsave(buff), VAR_READWRITE);
cln = getenv("LOGNAME");
cus = getenv("USER");
if (cus != NULL)
set(STRuser, quote(SAVE(cus)), VAR_READWRITE);
else if (cln != NULL)
set(STRuser, quote(SAVE(cln)), VAR_READWRITE);
else if ((pw = getpwuid(uid)) == NULL)
set(STRuser, SAVE("unknown"), VAR_READWRITE);
else
set(STRuser, SAVE(pw->pw_name), VAR_READWRITE);
if (cln == NULL)
tsetenv(STRLOGNAME, value(STRuser));
if (cus == NULL)
tsetenv(STRKUSER, value(STRuser));
}
/*
* 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, str2short("unknown"));
}
/*
* HOSTTYPE, too. Just set it again.
*/
tsetenv(STRHOSTTYPE, str2short(gethosttype()));
#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.
*/
if ((tcp = getenv("TERM")) != NULL) {
set(STRterm, quote(SAVE(tcp)), VAR_READWRITE);
editing = (strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0);
}
else
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)
set(STRedit, Strsave(STRNULL), VAR_READWRITE);
/*
* still more mutability: make the complete routine automatically add the
* suffix of file names...
*/
set(STRaddsuffix, Strsave(STRNULL), VAR_READWRITE);
/*
* Re-initialize path if set in environment
*/
if ((tcp = getenv("PATH")) == NULL)
set1(STRpath, defaultpath(), &shvhed, VAR_READWRITE);
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).
*/
int sh_len;
if ((tcp = getenv("SHELL")) != (char *)0 &&
(sh_len = strlen(tcp)) >= 5 &&
strcmp(tcp + (sh_len - 5), "/tcsh") == 0)
{
set(STRshell, quote(SAVE(tcp)), VAR_READWRITE);
}
else
set(STRshell, Strsave(STR_SHELLPATH), VAR_READWRITE);
}
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
/*
* PURIFY-2 claims that osv does not get
* initialized after the sigvec call
*/
setzero((char*) &osv, sizeof(osv));
/* 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 */
# ifdef COHERENT
if (loginsh) /* it seems that SIGTERM is always set to SIG_IGN by */
/* init/getty so it should be set to SIG_DFL - there may be */
/* a better fix for this. */
parterm = SIG_DFL;
else
# else /* !COHERENT */
parterm = signal(SIGTERM, SIG_IGN); /* parents terminability */
# endif /* COHERENT */
(void) sigset(SIGTERM, parterm); /* ... restore */
#endif /* BSDSIGS */
#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++;
#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
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 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;
case 'd': /* -d Load directory stack from file */
rdirs = 1;
break;
#ifdef apollo
case 'D': /* -D Define environment variable */
{
register 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': /* Undocumented flag */
/*
* This will cause children to be created using fork instead of
* vfork.
*/
use_fork = 1;
break;
default: /* Unknown command option */
exiterr = 1;
stderror(ERR_TCSHUSAGE, tcp-1);
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 = open(tempv[0], O_RDONLY);
if (nofile < 0) {
child = 1; /* So this ... */
/* ... doesn't return */
stderror(ERR_SYSTEM, tempv[0], strerror(errno));
}
if (ffile != NULL)
xfree((ptr_t) 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++;
}
/*
* 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 != euid || gid != egid)) {
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, VAR_READWRITE);
/*
* Set up the prompt.
*/
if (prompt) {
set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymarrow),
VAR_READWRITE);
/* that's a meta-questionmark */
set(STRprompt2, Strsave(STRmquestion), VAR_READWRITE);
set(STRprompt3, Strsave(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) {
sigret_t (*osig)();
**argv = '-';
if (!quitit) /* Wary! */
(void) signal(SIGQUIT, SIG_IGN);
(void) sigset(SIGINT, pintr);
(void) sighold(SIGINT);
(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.
*/
osig = signal(SIGHUP, phup); /* exit processing on HUP */
if (osig == SIG_IGN)
(void) signal(SIGHUP, osig);
#ifdef SIGXCPU
osig = signal(SIGXCPU, phup); /* exit processing on XCPU */
if (osig == SIG_IGN)
(void) signal(SIGXCPU, osig);
#endif
#ifdef SIGXFSZ
osig = signal(SIGXFSZ, phup); /* exit processing on XFSZ */
if (osig == SIG_IGN)
(void) signal(SIGXFSZ, osig);
#endif
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;
#ifdef NeXT
/* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */
if (shpgrp == 0) {
shpgrp = getpid();
(void) setpgid(0, shpgrp);
(void) tcsetpgrp(f, shpgrp);
}
#endif /* NeXT */
#ifdef BSDJOBS /* if we have tty job control */
retry:
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
(void) close_on_exec(dcopy(f, FSHTTY), 1);
}
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;
/*
* 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
*/
#if SYSVREL > 3
{
struct sigaction act;
act.sa_handler=pchild;
(void) sigemptyset(&(act.sa_mask)); /* Don't block any extra sigs
* when the handler is called
*/
act.sa_flags=0; /* want behaviour of sigset() without
* SA_NOCLDSTOP
*/
(void) sigaction(SIGCHLD,&act,(struct sigaction *)NULL);
}
#else /* SYSVREL <= 3 */
(void) sigset(SIGCHLD, pchild); /* while signals not ready */
#endif /* SYSVREL <= 3 */
if (intty && !arginp)
(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.
*/
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;
sigret_t (*oparintr)() = parintr;
#ifdef BSDSIGS
sigmask_t omask = sigblock(sigmask(SIGINT));
#else
(void) sighold(SIGINT);
#endif
setintr = 0;
parintr = SIG_IGN; /* onintr in /etc/ files has no effect */
#ifdef _PATH_DOTCSHRC
(void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL);
#endif
if (!arginp && !onelflg && !havhash)
dohash(NULL,NULL);
#ifdef _PATH_DOTLOGIN
if (loginsh)
(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
#endif
#ifdef BSDSIGS
(void) sigsetmask(omask);
#else
(void) sigrelse(SIGINT);
#endif
setintr = osetintr;
parintr = oparintr;
}
#ifdef LOGINFIRST
if (loginsh)
(void) srccat(value(STRhome), STRsldotlogin);
#endif
/* upward compat. */
if (!srccat(value(STRhome), STRsldottcshrc))
(void) srccat(value(STRhome), STRsldotcshrc);
if (!fast && !arginp && !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(value(STRhome), STRsldotlogin);
#endif
if (!fast && (loginsh || rdirs))
loaddirs(NULL);
}
/* Initing AFTER .cshrc is the Right Way */
if (intty && !arginp) { /* 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);
/*
* 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(NULL, NULL);
}
else {
xprintf("exit\n");
}
}
recdirs(NULL);
rechist(NULL);
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 == 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 = (Char **) xcalloc((size_t) (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;
}
dp++;
}
pv[i] = 0;
set1(STRpath, pv, &shvhed, VAR_READWRITE);
}
/*
* 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, NULL);
else {
register Char *ep = Strspl(cp, dp);
char *ptr = short2str(ep);
xfree((ptr_t) ep);
return srcfile(ptr, (mflag ? 0 : 1), 0, NULL);
}
}
/*
* Source to a file putting the file descriptor in a safe place (> 2).
*/
static int
srcfile(f, onlyown, flag, av)
char *f;
bool onlyown;
int flag;
Char **av;
{
register int unit;
if ((unit = open(f, O_RDONLY)) == -1)
return 0;
unit = dmove(unit, -1);
(void) close_on_exec(unit, 1);
srcunit(unit, onlyown, flag, av);
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 Char **goargv = NULL;
static void
srcunit(unit, onlyown, hflg, av)
register int unit;
bool onlyown;
int hflg;
Char **av;
{
/*
* PWP: this is arranged like this so that an optimizing compiler 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;
Char **oargv;
struct Bin saveB;
#ifdef BSDSIGS
volatile sigmask_t omask = (sigmask_t) 0;
#endif
jmp_buf_t 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) {
(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
* compiler-dependant code here) PWP: THANKS LOTS !!!
*/
/* Setup the new values of the state stuff saved above */
#ifdef NO_STRUCT_ASSIGNMENT
(void) memmove((ptr_t) &(saveB), (ptr_t) &B, sizeof(B));
#else
saveB = B;
#endif
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';
/*
* 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.
*/
oargv = goargv;
goargv = NULL;
if (av != NULL && *av != NULL && **av != '\0') {
struct varent *vp;
if ((vp = adrof(STRargv)) != NULL)
goargv = saveblk(vp->vec);
setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE);
}
/*
* 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 */
#ifdef cray
my_reenter = 1; /* assume non-zero return val */
if (setexit() == 0) {
my_reenter = 0; /* Oh well, we were wrong */
#else
if ((my_reenter = setexit()) == 0) {
#endif
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;
register Char** nfbuf = fbuf;
register int nfblocks = fblocks;
fblocks = 0;
fbuf = NULL;
for (i = 0; i < nfblocks; i++)
xfree((ptr_t) nfbuf[i]);
xfree((ptr_t) nfbuf);
/* Reset input arena */
#ifdef NO_STRUCT_ASSIGNMENT
(void) memmove((ptr_t) &B, (ptr_t) &(saveB), sizeof(B));
#else
B = saveB;
#endif
(void) close(SHIN), SHIN = oSHIN;
arginp = oarginp, onelflg = oonelflg;
evalp = oevalp, evalvec = oevalvec;
intty = oldintty, whyles = oldwhyl, gointr = ogointr;
if (enterhist)
HIST = OHIST;
if (av != NULL && *av != NULL && **av != '\0') {
if (goargv)
setq(STRargv, goargv, &shvhed, VAR_READWRITE);
else
unsetv(STRargv);
}
enterhist = oenterhist;
cantell = otell;
}
resexit(oldexit);
goargv = oargv;
/*
* If process reset() (effectively an unwind) then we must also unwind.
*/
if (my_reenter)
stderror(ERR_SILENT);
insource = oinsource;
}
/*ARGSUSED*/
void
goodbye(v, c)
Char **v;
struct command *c;
{
USE(c);
rechist(NULL);
recdirs(NULL);
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, VAR_READWRITE);
#ifdef _PATH_DOTLOGOUT
(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
#endif
if (adrof(STRhome))
(void) srccat(value(STRhome), STRsldtlogout);
#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(snum)
int snum;
{
#ifdef UNRELSIGS
if (snum)
(void) sigset(snum, SIG_IGN);
#endif /* UNRELSIGS */
rechist(NULL);
recdirs(NULL);
#if defined(POSIXJOBS) || defined(sgi)
/*
* 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 &&
killpg(np->p_jobid, SIGHUP) != -1) {
/* In case the job was suspended... */
(void) killpg(np->p_jobid, SIGCONT);
break;
}
while ((np = np->p_friends) != pp);
}
}
#endif /* POSIXJOBS|| sgi */
xexit(snum);
#ifndef SIGVOID
return (snum);
#endif
}
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) */
#ifdef SIGVOID
/*ARGSUSED*/
#endif
sigret_t
pintr(snum)
int snum;
{
#ifdef UNRELSIGS
if (snum)
(void) sigset(snum, pintr);
#endif /* UNRELSIGS */
just_signaled = 1;
pintr1(1);
#ifndef SIGVOID
return (snum);
#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;
xputchar('\n');
dojobs(jobargv, NULL);
stderror(ERR_NAME | ERR_INTR);
}
}
/* MH - handle interrupted completions specially */
{
extern int InsideCompletion;
if (InsideCompletion)
stderror(ERR_SILENT);
}
/* 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();
#ifndef _VMS_POSIX
(void) endpwent();
#endif /*atp vmsposix */
/*
* 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);
timflg = 0;
if ((v = pargv) != 0)
pargv = 0, blkfree(v);
if ((v = gargv) != 0)
gargv = 0, blkfree(v);
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.
*/
static struct command *savet = NULL;
void
process(catch)
bool catch;
{
extern char Expand;
jmp_buf_t 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();
/* This was leaking memory badly, particularly when sourcing
* files, etc.. For whatever reason we were arriving here with
* allocated pointers still active, and the code was simply
* overwriting them. I can't say I fully understand the
* control flow here, but according to Purify this particular
* leak has been plugged, and I haven't noticed any ill
* effects.. (sg)
*/
if (paraml.next && paraml.next != &paraml)
freelex(&paraml);
paraml.next = paraml.prev = &paraml;
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(&paraml);
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) {
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();
#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 == F_SEEK)
printprompt(0, NULL);
flush();
setalarm(1);
}
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(&paraml) && !seterr && intty && !tellwhat && !Expand &&
!whyles) || adrof(STRverbose)) {
haderr = 1;
prlex(&paraml);
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 && !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)
reset();
/*
* If had a tellwhat from twenex() then do
*/
if (tellwhat) {
tellmewhat(&paraml);
reset();
}
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.
*/
savet = syntax(paraml.next, &paraml, 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(&paraml);
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);
}
/*ARGSUSED*/
void
dosource(t, c)
register Char **t;
struct command *c;
{
register Char *f;
bool hflg = 0;
extern int bequiet;
char buf[BUFSIZE];
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);
(void) strcpy(buf, short2str(f));
xfree((ptr_t) f);
if ((!srcfile(buf, 0, hflg, t)) && (!hflg) && (!bequiet))
stderror(ERR_SYSTEM, 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."
*/
/*
* 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()
{
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++) {
char *filename = short2str(*vp);
if (stat(filename, &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_mode & S_IFMT) == S_IFDIR) {
DIR *mailbox;
int mailcount = 0;
if (stb.st_mtime <= chktim + 1 || (loginsh && !new))
continue;
if (!(mailbox = opendir(filename)))
continue;
if (!readdir(mailbox) || !readdir(mailbox))
continue;
while (readdir(mailbox))
mailcount++;
if (mailcount == 0)
continue;
if (cnt == 1) {
xprintf("You have %d piece%s of mail.\n", mailcount,
mailcount == 1 ? "" : "s");
}
else {
xprintf("You have %d piece%s of mail in %s.\n",
mailcount, mailcount == 1 ? "" : "s", filename);
}
}
else {
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("You have %smail in %s.\n", new ? "new " : "",
filename);
}
}
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)) != STRNULL) {
(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 */
(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 */
isdiagatty = isatty(SHDIAG);
isoutatty = isatty(SHOUT);
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 **
defaultpath()
{
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);
}
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