void
fg_proc_entry(struct process *pp)
{
jmp_buf_t osetexit;
int ohaderr;
Char oGettingInput;
size_t omark;
getexit(osetexit);
pintr_disabled++;
oGettingInput = GettingInput;
GettingInput = 0;
ohaderr = haderr; /* we need to ignore setting of haderr due to
* process getting stopped by a signal */
omark = cleanup_push_mark();
if (setexit() == 0) { /* come back here after pjwait */
pendjob();
(void) alarm(0); /* No autologout */
alrmcatch_disabled = 1;
if (!pstart(pp, 1)) {
pp->p_procid = 0;
stderror(ERR_BADJOB, pp->p_command, strerror(errno));
}
pjwait(pp);
}
setalarm(1); /* Autologout back on */
cleanup_pop_mark(omark);
resexit(osetexit);
haderr = ohaderr;
GettingInput = oGettingInput;
disabled_cleanup(&pintr_disabled);
}
/*
* Karl Kleinpaste, 21oct1983.
* Set up a one-word alias command, for use for special things.
* This code is based on the mainline of process().
*/
void
aliasrun(int cnt, Char *s1, Char *s2)
{
struct wordent w, *new1, *new2; /* for holding alias name */
struct command *t = NULL;
jmp_buf_t osetexit;
int status;
size_t omark;
getexit(osetexit);
if (seterr) {
xfree(seterr);
seterr = NULL; /* don't repeatedly print err msg. */
}
w.word = STRNULL;
new1 = xcalloc(1, sizeof w);
new1->word = Strsave(s1);
if (cnt == 1) {
/* build a lex list with one word. */
w.next = w.prev = new1;
new1->next = new1->prev = &w;
}
else {
/* build a lex list with two words. */
new2 = xcalloc(1, sizeof w);
new2->word = Strsave(s2);
w.next = new2->prev = new1;
new1->next = w.prev = new2;
new1->prev = new2->next = &w;
}
cleanup_push(&w, lex_cleanup);
/* Save the old status */
status = getn(varval(STRstatus));
/* expand aliases like process() does. */
alias(&w);
/* build a syntax tree for the command. */
t = syntax(w.next, &w, 0);
cleanup_push(t, syntax_cleanup);
if (seterr)
stderror(ERR_OLD);
psavejob();
cleanup_push(&cnt, psavejob_cleanup); /* cnt is used only as a marker */
/* catch any errors here */
omark = cleanup_push_mark();
if (setexit() == 0)
/* execute the parse tree. */
/*
* From: Michael Schroeder <*****@*****.**>
* was execute(t, tpgrp);
*/
execute(t, tpgrp > 0 ? tpgrp : -1, NULL, NULL, TRUE);
/* reset the error catcher to the old place */
cleanup_pop_mark(omark);
resexit(osetexit);
if (haderr) {
haderr = 0;
/*
* Either precmd, or cwdcmd, or periodic had an error. Call it again so
* that it is removed
*/
if (precmd_active)
precmd();
if (postcmd_active)
postcmd();
#ifdef notdef
/*
* XXX: On the other hand, just interrupting them causes an error too.
* So if we hit ^C in the middle of cwdcmd or periodic the alias gets
* removed. We don't want that. Note that we want to remove precmd
* though, cause that could lead into an infinite loop. This should be
* fixed correctly, but then haderr should give us the whole exit
* status not just true or false.
*/
else if (cwdcmd_active)
cwd_cmd();
else if (beepcmd_active)
beep_cmd();
else if (periodic_active)
period_cmd();
#endif /* notdef */
}
cleanup_until(&w);
pendjob();
/* Restore status */
setv(STRstatus, putn((tcsh_number_t)status), VAR_READWRITE);
}
void
execute(struct command *t, int wtty, int *pipein, int *pipeout)
{
static sigset_t csigset, ocsigset;
static int nosigchld = 0, onosigchld = 0;
volatile int wanttty = wtty;
struct biltins * volatile bifunc;
int pv[2], pid;
sigset_t nsigset;
int forked;
UNREGISTER(forked);
UNREGISTER(bifunc);
UNREGISTER(wanttty);
forked = 0;
pid = 0;
if (t == 0)
return;
if (t->t_dflg & F_AMPERSAND)
wanttty = 0;
switch (t->t_dtyp) {
case NODE_COMMAND:
if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
(void)Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
if ((t->t_dflg & F_REPEAT) == 0)
Dfix(t); /* $ " ' \ */
if (t->t_dcom[0] == 0)
return;
/* FALLTHROUGH */
case NODE_PAREN:
if (t->t_dflg & F_PIPEOUT)
mypipe(pipeout);
/*
* Must do << early so parent will know where input pointer should be.
* If noexec then this is all we do.
*/
if (t->t_dflg & F_READ) {
(void)close(0);
heredoc(t->t_dlef);
if (noexec)
(void)close(0);
}
set(STRstatus, Strsave(STR0));
/*
* This mess is the necessary kludge to handle the prefix builtins:
* nice, nohup, time. These commands can also be used by themselves,
* and this is not handled here. This will also work when loops are
* parsed.
*/
while (t->t_dtyp == NODE_COMMAND)
if (eq(t->t_dcom[0], STRnice)) {
if (t->t_dcom[1]) {
if (strchr("+-", t->t_dcom[1][0])) {
if (t->t_dcom[2]) {
setname("nice");
t->t_nice =
getn(t->t_dcom[1]);
lshift(t->t_dcom, 2);
t->t_dflg |= F_NICE;
}
else
break;
} else {
t->t_nice = 4;
lshift(t->t_dcom, 1);
t->t_dflg |= F_NICE;
}
} else
break;
} else if (eq(t->t_dcom[0], STRnohup)) {
if (t->t_dcom[1]) {
t->t_dflg |= F_NOHUP;
lshift(t->t_dcom, 1);
}
else
break;
} else if (eq(t->t_dcom[0], STRtime)) {
if (t->t_dcom[1]) {
t->t_dflg |= F_TIME;
lshift(t->t_dcom, 1);
}
else
break;
} else
break;
/* is it a command */
if (t->t_dtyp == NODE_COMMAND) {
/*
* Check if we have a builtin function and remember which one.
*/
bifunc = isbfunc(t);
if (noexec && bifunc != NULL) {
/*
* Continue for builtins that are part of the scripting language
*/
if (bifunc->bfunct != dobreak && bifunc->bfunct != docontin &&
bifunc->bfunct != doelse && bifunc->bfunct != doend &&
bifunc->bfunct != doforeach && bifunc->bfunct != dogoto &&
bifunc->bfunct != doif && bifunc->bfunct != dorepeat &&
bifunc->bfunct != doswbrk && bifunc->bfunct != doswitch &&
bifunc->bfunct != dowhile && bifunc->bfunct != dozip)
break;
}
}
else { /* not a command */
bifunc = NULL;
if (noexec)
break;
}
/*
* We fork only if we are timed, or are not the end of a parenthesized
* list and not a simple builtin function. Simple meaning one that is
* not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
* fork in some of these cases.
*/
/*
* Prevent forking cd, pushd, popd, chdir cause this will cause the
* shell not to change dir!
*/
if (bifunc && (bifunc->bfunct == dochngd ||
bifunc->bfunct == dopushd ||
bifunc->bfunct == dopopd))
t->t_dflg &= ~(F_NICE);
if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
(!bifunc || t->t_dflg &
(F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP)))) ||
/*
* We have to fork for eval too.
*/
(bifunc && (t->t_dflg & (F_PIPEIN | F_PIPEOUT)) != 0 &&
bifunc->bfunct == doeval)) {
if (t->t_dtyp == NODE_PAREN ||
t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc) {
forked++;
/*
* We need to block SIGCHLD here, so that if the process does
* not die before we can set the process group
*/
if (wanttty >= 0 && !nosigchld) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &csigset);
nosigchld = 1;
}
pid = pfork(t, wanttty);
if (pid == 0 && nosigchld) {
(void)sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
backpid = pid;
}
else {
int ochild, osetintr, ohaderr, odidfds;
int oSHIN, oSHOUT, oSHERR, oOLDSTD, otpgrp;
sigset_t osigset;
/*
* Prepare for the vfork by saving everything that the child
* corrupts before it exec's. Note that in some signal
* implementations which keep the signal info in user space
* (e.g. Sun's) it will also be necessary to save and restore
* the current sigaction's for the signals the child touches
* before it exec's.
*/
if (wanttty >= 0 && !nosigchld && !noexec) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nsigset, &csigset);
nosigchld = 1;
}
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGCHLD);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
ochild = child;
osetintr = setintr;
ohaderr = haderr;
odidfds = didfds;
oSHIN = SHIN;
oSHOUT = SHOUT;
oSHERR = SHERR;
oOLDSTD = OLDSTD;
otpgrp = tpgrp;
ocsigset = csigset;
onosigchld = nosigchld;
Vsav = Vdp = 0;
Vexpath = 0;
Vt = 0;
pid = vfork();
if (pid < 0) {
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
stderror(ERR_NOPROC);
}
forked++;
if (pid) { /* parent */
child = ochild;
setintr = osetintr;
haderr = ohaderr;
didfds = odidfds;
SHIN = oSHIN;
SHOUT = oSHOUT;
SHERR = oSHERR;
OLDSTD = oOLDSTD;
tpgrp = otpgrp;
csigset = ocsigset;
nosigchld = onosigchld;
xfree((ptr_t) Vsav);
Vsav = 0;
xfree((ptr_t) Vdp);
Vdp = 0;
xfree((ptr_t) Vexpath);
Vexpath = 0;
blkfree((Char **) Vt);
Vt = 0;
/* this is from pfork() */
palloc(pid, t);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
else { /* child */
/* this is from pfork() */
int pgrp;
int ignint = 0;
if (nosigchld) {
(void)sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
if (setintr)
ignint =
(tpgrp == -1 &&
(t->t_dflg & F_NOINTERRUPT))
|| (gointr && eq(gointr, STRminus));
pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
child++;
if (setintr) {
setintr = 0;
if (ignint) {
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
else {
(void)signal(SIGINT, vffree);
(void)signal(SIGQUIT, SIG_DFL);
}
if (wanttty >= 0) {
(void)signal(SIGTSTP, SIG_DFL);
(void)signal(SIGTTIN, SIG_DFL);
(void)signal(SIGTTOU, SIG_DFL);
}
(void)signal(SIGTERM, parterm);
}
else if (tpgrp == -1 &&
(t->t_dflg & F_NOINTERRUPT)) {
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
pgetty(wanttty, pgrp);
if (t->t_dflg & F_NOHUP)
(void)signal(SIGHUP, SIG_IGN);
if (t->t_dflg & F_NICE)
(void)setpriority(PRIO_PROCESS, 0, t->t_nice);
}
}
}
if (pid != 0) {
/*
* It would be better if we could wait for the whole job when we
* knew the last process had been started. Pwait, in fact, does
* wait for the whole job anyway, but this test doesn't really
* express our intentions.
*/
if (didfds == 0 && t->t_dflg & F_PIPEIN) {
(void)close(pipein[0]);
(void)close(pipein[1]);
}
if ((t->t_dflg & F_PIPEOUT) == 0) {
if (nosigchld) {
(void)sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
if ((t->t_dflg & F_AMPERSAND) == 0)
pwait();
}
break;
}
doio(t, pipein, pipeout);
if (t->t_dflg & F_PIPEOUT) {
(void)close(pipeout[0]);
(void)close(pipeout[1]);
}
/*
* Perform a builtin function. If we are not forked, arrange for
* possible stopping
*/
if (bifunc) {
func(t, bifunc);
if (forked)
exitstat();
break;
}
if (t->t_dtyp != NODE_PAREN)
doexec(NULL, t);
/*
* For () commands must put new 0,1,2 in FSH* and recurse
*/
(void) ioctl(OLDSTD = dcopy(0, FOLDSTD), FIOCLEX, NULL);
(void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
(void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL);
(void) close(SHIN);
SHIN = -1;
didfds = 0;
wanttty = -1;
t->t_dspr->t_dflg |= t->t_dflg & F_NOINTERRUPT;
execute(t->t_dspr, wanttty, NULL, NULL);
exitstat();
/* NOTREACHED */
case NODE_PIPE:
t->t_dcar->t_dflg |= F_PIPEOUT |
(t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
execute(t->t_dcar, wanttty, pipein, pv);
t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
if (wanttty > 0)
wanttty = 0; /* got tty already */
execute(t->t_dcdr, wanttty, pv, pipeout);
break;
case NODE_LIST:
if (t->t_dcar) {
t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
execute(t->t_dcar, wanttty, NULL, NULL);
/*
* In strange case of A&B make a new job after A
*/
if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
(t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
pendjob();
}
if (t->t_dcdr) {
t->t_dcdr->t_dflg |= t->t_dflg &
(F_NOFORK | F_NOINTERRUPT);
execute(t->t_dcdr, wanttty, NULL, NULL);
}
break;
case NODE_OR:
case NODE_AND:
if (t->t_dcar) {
t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
execute(t->t_dcar, wanttty, NULL, NULL);
if ((getn(value(STRstatus)) == 0) !=
(t->t_dtyp == NODE_AND))
return;
}
if (t->t_dcdr) {
t->t_dcdr->t_dflg |= t->t_dflg &
(F_NOFORK | F_NOINTERRUPT);
execute(t->t_dcdr, wanttty, NULL, NULL);
}
break;
}
/*
* Fall through for all breaks from switch
*
* If there will be no more executions of this command, flush all file
* descriptors. Places that turn on the F_REPEAT bit are responsible for
* doing donefds after the last re-execution
*/
if (didfds && !(t->t_dflg & F_REPEAT))
donefds();
}
/*VARARGS 1*/
void
execute(struct command *t, volatile int wanttty, int *pipein, int *pipeout,
int do_glob)
{
int forked = 0;
const struct biltins * volatile bifunc;
pid_t pid = 0;
int pv[2];
sigset_t set;
static sigset_t csigset;
#ifdef VFORK
static int onosigchld = 0;
#endif /* VFORK */
static int nosigchld = 0;
(void) &wanttty;
(void) &forked;
(void) &bifunc;
if (t == 0)
return;
#ifdef WINNT_NATIVE
{
if ((varval(STRNTslowexec) == STRNULL) &&
!t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
(intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
!isbfunc(t)) {
if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
(void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
Dfix(t);
if (nt_try_fast_exec(t) == 0)
return;
}
}
#endif /* WINNT_NATIVE */
/*
* Ed [email protected] & Dominic [email protected]
* Sat Feb 25 03:13:11 PST 1995
* try implicit cd if we have a 1 word command
*/
if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
Char *sCName;
struct stat stbuf;
char *pathname;
sCName = dollar(t->t_dcom[0]);
if (sCName != NULL && sCName[0] == '~') {
struct Strbuf buf = Strbuf_INIT;
const Char *name_end;
for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/';
name_end++)
continue;
if (name_end != sCName + 1) {
Char *name, *home;
name = Strnsave(sCName + 1, name_end - (sCName + 1));
home = gethdir(name);
if (home != NULL) {
Strbuf_append(&buf, home);
xfree(home);
} else
Strbuf_append(&buf, name);
xfree(name);
} else
Strbuf_append(&buf, varval(STRhome));
Strbuf_append(&buf, name_end);
xfree(sCName);
sCName = Strbuf_finish(&buf);
}
pathname = short2str(sCName);
xfree(sCName);
/* if this is a dir, tack a "cd" on as the first arg */
if (pathname != NULL &&
((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
#ifdef WINNT_NATIVE
|| (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
#endif /* WINNT_NATIVE */
)) {
Char *vCD[2];
Char **ot_dcom = t->t_dcom;
vCD[0] = Strsave(STRcd);
vCD[1] = NULL;
t->t_dcom = blkspl(vCD, ot_dcom);
xfree(ot_dcom);
if (implicit_cd > 1) {
blkpr(t->t_dcom);
xputchar( '\n' );
}
}
}
/*
* From: Michael Schroeder <*****@*****.**>
* Don't check for wantty > 0...
*/
if (t->t_dflg & F_AMPERSAND)
wanttty = 0;
switch (t->t_dtyp) {
case NODE_COMMAND:
if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
memmove(t->t_dcom[0], t->t_dcom[0] + 1,
(Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0]));
if ((t->t_dflg & F_REPEAT) == 0)
Dfix(t); /* $ " ' \ */
if (t->t_dcom[0] == 0) {
return;
}
/*FALLTHROUGH*/
case NODE_PAREN:
#ifdef BACKPIPE
if (t->t_dflg & F_PIPEIN)
mypipe(pipein);
#else /* !BACKPIPE */
if (t->t_dflg & F_PIPEOUT)
mypipe(pipeout);
#endif /* BACKPIPE */
/*
* Must do << early so parent will know where input pointer should be.
* If noexec then this is all we do.
*/
if (t->t_dflg & F_READ) {
xclose(0);
heredoc(t->t_dlef);
if (noexec)
xclose(0);
}
setcopy(STRstatus, STR0, VAR_READWRITE);
/*
* This mess is the necessary kludge to handle the prefix builtins:
* nice, nohup, time. These commands can also be used by themselves,
* and this is not handled here. This will also work when loops are
* parsed.
*/
while (t->t_dtyp == NODE_COMMAND)
if (eq(t->t_dcom[0], STRnice)) {
if (t->t_dcom[1]) {
if (strchr("+-", t->t_dcom[1][0])) {
if (t->t_dcom[2]) {
setname("nice");
t->t_nice = (unsigned char)getn(t->t_dcom[1]);
lshift(t->t_dcom, 2);
t->t_dflg |= F_NICE;
}
else
break;
}
else {
t->t_nice = 4;
lshift(t->t_dcom, 1);
t->t_dflg |= F_NICE;
}
}
else
break;
}
else if (eq(t->t_dcom[0], STRnohup)) {
if (t->t_dcom[1]) {
t->t_dflg |= F_NOHUP;
lshift(t->t_dcom, 1);
}
else
break;
}
else if (eq(t->t_dcom[0], STRhup)) {
if (t->t_dcom[1]) {
t->t_dflg |= F_HUP;
lshift(t->t_dcom, 1);
}
else
break;
}
else if (eq(t->t_dcom[0], STRtime)) {
if (t->t_dcom[1]) {
t->t_dflg |= F_TIME;
lshift(t->t_dcom, 1);
}
else
break;
}
#ifdef F_VER
else if (eq(t->t_dcom[0], STRver))
if (t->t_dcom[1] && t->t_dcom[2]) {
setname("ver");
t->t_systype = getv(t->t_dcom[1]);
lshift(t->t_dcom, 2);
t->t_dflg |= F_VER;
}
else
break;
#endif /* F_VER */
else
break;
/* is it a command */
if (t->t_dtyp == NODE_COMMAND) {
/*
* Check if we have a builtin function and remember which one.
*/
bifunc = isbfunc(t);
if (noexec) {
/*
* Continue for builtins that are part of the scripting language
*/
if (bifunc == NULL)
break;
if (bifunc->bfunct != (bfunc_t)dobreak &&
bifunc->bfunct != (bfunc_t)docontin &&
bifunc->bfunct != (bfunc_t)doelse &&
bifunc->bfunct != (bfunc_t)doend &&
bifunc->bfunct != (bfunc_t)doforeach&&
bifunc->bfunct != (bfunc_t)dogoto &&
bifunc->bfunct != (bfunc_t)doif &&
bifunc->bfunct != (bfunc_t)dorepeat &&
bifunc->bfunct != (bfunc_t)doswbrk &&
bifunc->bfunct != (bfunc_t)doswitch &&
bifunc->bfunct != (bfunc_t)dowhile &&
bifunc->bfunct != (bfunc_t)dozip)
break;
}
}
else { /* not a command */
bifunc = NULL;
if (noexec)
break;
}
/*
* GrP Executing a command - run jobcmd hook
* Don't run for builtins
* Don't run if we're not in a tty
* Don't run if we're not really executing
*/
/*
* CR - Charles Ross Aug 2005
* added "isoutatty".
* The new behavior is that the jobcmd won't be executed
* if stdout (SHOUT) isnt attached to a tty.. IE when
* redirecting, or using backquotes etc..
*/
if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty && isoutatty) {
Char *cmd = unparse(t);
cleanup_push(cmd, xfree);
job_cmd(cmd);
cleanup_until(cmd);
}
/*
* We fork only if we are timed, or are not the end of a parenthesized
* list and not a simple builtin function. Simple meaning one that is
* not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
* fork in some of these cases.
*/
#ifdef BACKPIPE
/*
* Can't have NOFORK for the tail of a pipe - because it is not the
* last command spawned (even if it is at the end of a parenthesised
* list).
*/
if (t->t_dflg & F_PIPEIN)
t->t_dflg &= ~(F_NOFORK);
#else
/*
* "command | builtin" may cause major misbehaviour as noted in
* in the BUGS file entry
* Subject: Redirected input to built-in functions misbehaves badly
* forking when the builtin is the end of the pipe corrects the
* problem.
*/
if (bifunc && (t->t_dflg & F_PIPEIN))
t->t_dflg &= ~(F_NOFORK);
#endif /* BACKPIPE */
/*
* Prevent forking cd, pushd, popd, chdir cause this will cause the
* shell not to change dir! (XXX: but only for nice?)
*/
if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
bifunc->bfunct == (bfunc_t)dopushd ||
bifunc->bfunct == (bfunc_t)dopopd))
t->t_dflg &= ~(F_NICE);
if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
(!bifunc || t->t_dflg &
(F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
/*
* We have to fork for eval too.
*/
(bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
bifunc->bfunct == (bfunc_t)doeval)) {
#ifdef VFORK
if (t->t_dtyp == NODE_PAREN ||
t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
#endif /* VFORK */
{
forked++;
/*
* We need to block SIGCHLD here, so that if the process does
* not die before we can set the process group
*/
if (wanttty >= 0 && !nosigchld) {
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &set, &csigset);
nosigchld = 1;
}
pid = pfork(t, wanttty);
if (pid == 0 && nosigchld) {
sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
backpid = pid;
}
#ifdef VFORK
else {
int ochild, osetintr, ohaderr, odidfds;
int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
int oisoutatty, oisdiagatty;
sigset_t oset, ocsigset;
# ifndef CLOSE_ON_EXEC
int odidcch;
# endif /* !CLOSE_ON_EXEC */
/*
* Prepare for the vfork by saving everything that the child
* corrupts before it exec's. Note that in some signal
* implementations which keep the signal info in user space
* (e.g. Sun's) it will also be necessary to save and restore
* the current sigvec's for the signals the child touches
* before it exec's.
*/
/*
* Sooooo true... If this is a Sun, save the sigvec's. (Skip
* Gilbrech - 11/22/87)
*/
# ifdef SAVESIGVEC
struct sigaction savesv[NSIGSAVED];
sigset_t savesm;
# endif /* SAVESIGVEC */
if (wanttty >= 0 && !nosigchld && !noexec) {
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &set, &csigset);
nosigchld = 1;
}
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGINT);
(void)sigprocmask(SIG_BLOCK, &set, &oset);
ochild = child;
osetintr = setintr;
ohaderr = haderr;
odidfds = didfds;
# ifndef CLOSE_ON_EXEC
odidcch = didcch;
# endif /* !CLOSE_ON_EXEC */
oSHIN = SHIN;
oSHOUT = SHOUT;
oSHDIAG = SHDIAG;
oOLDSTD = OLDSTD;
otpgrp = tpgrp;
oisoutatty = isoutatty;
oisdiagatty = isdiagatty;
ocsigset = csigset;
onosigchld = nosigchld;
Vsav = Vdp = 0;
Vexpath = 0;
Vt = 0;
# ifdef SAVESIGVEC
savesigvec(savesv, savesm);
# endif /* SAVESIGVEC */
if (use_fork)
pid = fork();
else
pid = vfork();
if (pid < 0) {
# ifdef SAVESIGVEC
restoresigvec(savesv, savesm);
# endif /* SAVESIGVEC */
sigprocmask(SIG_SETMASK, &oset, NULL);
stderror(ERR_NOPROC);
}
forked++;
if (pid) { /* parent */
# ifdef SAVESIGVEC
restoresigvec(savesv, savesm);
# endif /* SAVESIGVEC */
child = ochild;
setintr = osetintr;
haderr = ohaderr;
didfds = odidfds;
SHIN = oSHIN;
# ifndef CLOSE_ON_EXEC
didcch = odidcch;
# endif /* !CLOSE_ON_EXEC */
SHOUT = oSHOUT;
SHDIAG = oSHDIAG;
OLDSTD = oOLDSTD;
tpgrp = otpgrp;
isoutatty = oisoutatty;
isdiagatty = oisdiagatty;
csigset = ocsigset;
nosigchld = onosigchld;
xfree(Vsav);
Vsav = 0;
xfree(Vdp);
Vdp = 0;
xfree(Vexpath);
Vexpath = 0;
blk_cleanup(Vt);
Vt = 0;
/* this is from pfork() */
palloc(pid, t);
sigprocmask(SIG_SETMASK, &oset, NULL);
}
else { /* child */
/* this is from pfork() */
pid_t pgrp;
int ignint = 0;
if (nosigchld) {
sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
if (setintr)
ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
|| (gointr && eq(gointr, STRminus));
pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
child++;
if (setintr) {
setintr = 0;
/*
* casts made right for SunOS 4.0 by Douglas C. Schmidt
* <*****@*****.**>
* (thanks! -- PWP)
*
* ignint ifs cleaned by Johan Widen <[email protected]>
* (thanks again)
*/
if (ignint) {
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
}
else {
(void) signal(SIGINT, vffree);
(void) signal(SIGQUIT, SIG_DFL);
}
# ifdef BSDJOBS
if (wanttty >= 0) {
(void) signal(SIGTSTP, SIG_DFL);
(void) signal(SIGTTIN, SIG_DFL);
(void) signal(SIGTTOU, SIG_DFL);
}
# endif /* BSDJOBS */
sigaction(SIGTERM, &parterm, NULL);
}
else if (tpgrp == -1 &&
(t->t_dflg & F_NOINTERRUPT)) {
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
}
pgetty(wanttty, pgrp);
if (t->t_dflg & F_NOHUP)
(void) signal(SIGHUP, SIG_IGN);
if (t->t_dflg & F_HUP)
(void) signal(SIGHUP, SIG_DFL);
if (t->t_dflg & F_NICE) {
int nval = SIGN_EXTEND_CHAR(t->t_nice);
# if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
stderror(ERR_SYSTEM, "setpriority",
strerror(errno));
# else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
(void) nice(nval);
# endif /* HAVE_SETPRIORITY && PRIO_PROCESS */
}
# ifdef F_VER
if (t->t_dflg & F_VER) {
tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
dohash(NULL, NULL);
}
# endif /* F_VER */
}
}
#endif /* VFORK */
}
if (pid != 0) {
/*
* It would be better if we could wait for the whole job when we
* knew the last process had been started. Pwait, in fact, does
* wait for the whole job anyway, but this test doesn't really
* express our intentions.
*/
#ifdef BACKPIPE
if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
xclose(pipeout[0]);
xclose(pipeout[1]);
}
if ((t->t_dflg & F_PIPEIN) != 0)
break;
#else /* !BACKPIPE */
if (didfds == 0 && t->t_dflg & F_PIPEIN) {
xclose(pipein[0]);
xclose(pipein[1]);
}
if ((t->t_dflg & F_PIPEOUT) != 0)
break;
#endif /* BACKPIPE */
if (nosigchld) {
sigprocmask(SIG_SETMASK, &csigset, NULL);
nosigchld = 0;
}
if ((t->t_dflg & F_AMPERSAND) == 0)
pwait();
break;
}
doio(t, pipein, pipeout);
#ifdef BACKPIPE
if (t->t_dflg & F_PIPEIN) {
xclose(pipein[0]);
xclose(pipein[1]);
}
#else /* !BACKPIPE */
if (t->t_dflg & F_PIPEOUT) {
xclose(pipeout[0]);
xclose(pipeout[1]);
}
#endif /* BACKPIPE */
/*
* Perform a builtin function. If we are not forked, arrange for
* possible stopping
*/
if (bifunc) {
if (forked) {
func(t, bifunc);
exitstat();
} else {
jmp_buf_t oldexit;
int ohaderr = haderr;
getexit(oldexit);
if (setexit() == 0)
func(t, bifunc);
resexit(oldexit);
haderr = ohaderr;
if (adrof(STRprintexitvalue)) {
int rv = getn(varval(STRstatus));
if (rv != 0)
xprintf(CGETS(17, 2, "Exit %d\n"), rv);
}
}
break;
}
if (t->t_dtyp != NODE_PAREN) {
doexec(t, do_glob);
/* NOTREACHED */
}
/*
* For () commands must put new 0,1,2 in FSH* and recurse
*/
if ((OLDSTD = dcopy(0, FOLDSTD)) >= 0)
(void)close_on_exec(OLDSTD, 1);
if ((SHOUT = dcopy(1, FSHOUT)) >= 0) {
(void)close_on_exec(SHOUT, 1);
isoutatty = isatty(SHOUT);
}
if ((SHDIAG = dcopy(2, FSHDIAG)) >= 0) {
(void)close_on_exec(SHDIAG, 1);
isdiagatty = isatty(SHDIAG);
}
xclose(SHIN);
SHIN = -1;
#ifndef CLOSE_ON_EXEC
didcch = 0;
#else
(void) close_on_exec(FSHOUT, 1);
(void) close_on_exec(FSHDIAG, 1);
(void) close_on_exec(FOLDSTD, 1);
#endif /* !CLOSE_ON_EXEC */
didfds = 0;
wanttty = -1;
t->t_dspr->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
exitstat();
case NODE_PIPE:
#ifdef BACKPIPE
t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
(F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
execute(t->t_dcar, wanttty, pipein, pv, do_glob);
#else /* !BACKPIPE */
t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
(F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
execute(t->t_dcar, wanttty, pipein, pv, do_glob);
t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
#endif /* BACKPIPE */
break;
case NODE_LIST:
if (t->t_dcar) {
t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
/*
* In strange case of A&B make a new job after A
*/
if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
(t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
pendjob();
}
if (t->t_dcdr) {
t->t_dcdr->t_dflg |= t->t_dflg &
(F_NOFORK | F_NOINTERRUPT | F_BACKQ);
execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
}
break;
case NODE_OR:
case NODE_AND:
if (t->t_dcar) {
t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
if ((getn(varval(STRstatus)) == 0) !=
(t->t_dtyp == NODE_AND)) {
return;
}
}
if (t->t_dcdr) {
t->t_dcdr->t_dflg |= t->t_dflg &
(F_NOFORK | F_NOINTERRUPT | F_BACKQ);
execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
}
break;
default:
break;
}
/*
* Fall through for all breaks from switch
*
* If there will be no more executions of this command, flush all file
* descriptors. Places that turn on the F_REPEAT bit are responsible for
* doing donefds after the last re-execution
*/
if (didfds && !(t->t_dflg & F_REPEAT))
donefds();
}