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freebsd/contrib/tcsh/sh.c
Roman Divacky e05b498065 Fix tcsh losing history when tcsh terminates because the pty beneath it 
is closed.

Diagnosed by Ted Anderson:

New signal queuing logic was introduced in 6.15 and allows the signal handlers
to be run explicitly by calling handle_pending_signals, instead of
immediately when the signal is delivered.  This function is called at
various places, typically when receiving a EINTR from a slow system call
such as read or write.  In the pty exit case, it was called from xwrite,
called from flush, while printing the "exit" message after receiving EOF
when reading from the pty (note that the read did not return EINTR but
zero bytes, indicating EOF).  The SIGHUP handler, phup(), called
rechist, which opened the history file and began writing the merged
history to it.  This process invoked flush recursively to actually write
the data.  In this case, however, the flush noticed it was being called
recursively and decided fail by calling stderror.

My conclusion was that the signal was being handled at a bad time.  But
whether to fix flush not to care about the recursive call, or to handle
the signal some other time and when to handle it, was unclear to me.
However, by adding an extra call to handle_pending_signals, just after
process() returns to main(), I was able to avoid the truncated history
after network outages and similar failures.  I verified this fix in
version 6.17.

Approved by:	ed (mentor)
MFC after:	1 week
2009-10-06 20:19:16 +00:00

2381 lines
57 KiB
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/* $Header: /p/tcsh/cvsroot/tcsh/sh.c,v 3.145 2009/06/25 21:15:37 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. 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("$tcsh: sh.c,v 3.145 2009/06/25 21:15:37 christos Exp $")
#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 INIT_ZERO_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 **);
int
main(int argc, char **argv)
{
int batch = 0;
volatile int nexececho = 0;
int nofile = 0;
volatile int nverbose = 0;
volatile int rdirs = 0;
int quitit = 0;
Char *cp;
#ifdef AUTOLOGOUT
Char *cp2;
#endif
char *tcp, *ttyn;
int f, reenter;
char **tempv;
int osetintr;
struct sigaction oparintr;
#ifdef WINNT_NATIVE
nt_init();
#endif /* WINNT_NATIVE */
#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 */
nlsinit();
#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 = strcmp(progname, tcshstr) == 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_environ = blk2short(environ);
environ = short2blk(STR_environ); /* So that we can free it */
STR_WORD_CHARS = SAVE(WORD_CHARS);
HIST = '!';
HISTSUB = '^';
PRCH = '>';
PRCHROOT = '#';
word_chars = STR_WORD_CHARS;
bslash_quote = 0; /* PWP: do tcsh-style backslash quoting? */
/* Default history size to 100 */
setcopy(STRhistory, str2short("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();
/*
* 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);
}
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(CTL_ESC(k)); k++)
continue;
AsciiOnly = MB_CUR_MAX == 1 && 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 = 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();
/*
* 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) {
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);
if ((tcp = getenv("HOME")) != NULL)
cp = quote(SAVE(tcp));
else
cp = NULL;
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(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, str2short("unknown"), 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, str2short("unknown"), 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, str2short("unknown"));
}
#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));
#endif /* COLOR_LS_F */
doldol = putn((int) getpid()); /* 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 */
shtemp = Strspl(STRtmpsh, doldol); /* For << */
#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
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
arginp = SAVE(tempv[0]);
/*
* 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);
}
}
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':
/*
* 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) {
if (tcsh)
setcopy(STRprompt, STRdeftcshprompt, VAR_READWRITE);
else
setcopy(STRprompt, STRdefcshprompt, 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 && 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 */
if (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 && !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.
*/
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 (!arginp && !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 (!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(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 && !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.
*/
/* 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 (0);
}
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
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(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;
}
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 my 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);
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.
*/
if ((hadhist && !seterr && intty && !tellwhat && !Expand && !whyles) ||
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);
cleanup_push(t, syntax_cleanup);
if (seterr)
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);
/*
* 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:
cleanup_until(&paraml);
}
cleanup_pop_mark(omark);
resexit(osetexit);
exitset--;
}
/*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);
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))
continue;
while (readdir(mailbox))
mailcount++;
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 */
isdiagatty = isatty(SHDIAG);
isoutatty = isatty(SHOUT);
#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;
/* 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) {
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);
}
}
/*
* 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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