long
setsignal(int signo, int vforked)
{
int action;
sig_t sigact = SIG_DFL;
struct sigaction act, oact;
char *t, tsig;
if ((t = trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
if (rootshell && !vforked && action == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag || minusc || sflag == 0)
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
if (debug)
break;
#endif
/* FALLTHROUGH */
case SIGTERM:
if (iflag)
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (mflag)
action = S_IGN;
break;
#endif
}
}
t = &sigmode[signo - 1];
tsig = *t;
if (tsig == 0) {
/*
* current setting unknown
*/
if (!getsigaction(signo, &sigact)) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
return 0;
}
if (sigact == SIG_IGN) {
if (mflag && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) {
tsig = S_IGN; /* don't hard ignore these */
} else
tsig = S_HARD_IGN;
} else {
tsig = S_RESET; /* force to be set */
}
}
if (tsig == S_HARD_IGN || tsig == action)
return 0;
switch (action) {
case S_DFL: sigact = SIG_DFL; break;
case S_CATCH: sigact = onsig; break;
case S_IGN: sigact = SIG_IGN; break;
}
if (!vforked)
*t = action;
act.sa_handler = sigact;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
#ifdef SA_INTERRUPT
act.sa_flags |= SA_INTERRUPT;
#endif
if(sigaction(signo, &act, &oact) < 0)
return (long) SIG_ERR;
return (long) oact.sa_handler;
}
/*
* Set the signal handler for the specified signal. The routine figures
* out what it should be set to.
*/
void
setsignal(int signo)
{
int action;
sig_t sigact = SIG_DFL;
struct sigaction sa;
char *t;
if ((t = trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
if (action == S_DFL) {
switch (signo) {
case SIGINT:
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
{
extern int debug;
if (debug)
break;
}
#endif
action = S_CATCH;
break;
case SIGTERM:
if (rootshell && iflag)
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (rootshell && mflag)
action = S_IGN;
break;
#endif
#ifndef NO_HISTORY
case SIGWINCH:
if (rootshell && iflag)
action = S_CATCH;
break;
#endif
}
}
t = &sigmode[signo];
if (*t == 0) {
/*
* current setting unknown
*/
if (!getsigaction(signo, &sigact)) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
return;
}
if (sigact == SIG_IGN) {
if (mflag && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) {
*t = S_IGN; /* don't hard ignore these */
} else
*t = S_HARD_IGN;
} else {
*t = S_RESET; /* force to be set */
}
}
if (*t == S_HARD_IGN || *t == action)
return;
switch (action) {
case S_DFL: sigact = SIG_DFL; break;
case S_CATCH: sigact = onsig; break;
case S_IGN: sigact = SIG_IGN; break;
}
*t = action;
sa.sa_handler = sigact;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(signo, &sa, NULL);
}
void
setsignal(shinstance *psh, int signo, int vforked)
{
int action;
shsig_t sigact = SH_SIG_DFL;
char *t, tsig;
if ((t = psh->trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
if (psh->rootshell && !vforked && action == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag(psh) || psh->minusc || sflag(psh) == 0)
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
if (debug(psh))
break;
#endif
/* FALLTHROUGH */
case SIGTERM:
if (iflag(psh))
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (mflag(psh))
action = S_IGN;
break;
#endif
}
}
t = &psh->sigmode[signo - 1];
tsig = *t;
if (tsig == 0) {
/*
* current setting unknown
*/
if (!getsigaction(psh, signo, &sigact)) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
return;
}
if (sigact == SH_SIG_IGN) {
if (mflag(psh) && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) {
tsig = S_IGN; /* don't hard ignore these */
} else
tsig = S_HARD_IGN;
} else {
tsig = S_RESET; /* force to be set */
}
}
if (tsig == S_HARD_IGN || tsig == action)
return;
switch (action) {
case S_DFL: sigact = SH_SIG_DFL; break;
case S_CATCH: sigact = onsig; break;
case S_IGN: sigact = SH_SIG_IGN; break;
}
if (!vforked)
*t = action;
sh_siginterrupt(psh, signo, 1);
sh_signal(psh, signo, sigact);
}
sig_t
setsignal(int signo, int vforked)
{
int action;
sig_t sigact = SIG_DFL, sig;
char *t, tsig;
if ((t = trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
if (rootshell && !vforked && action == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag || minusc || sflag == 0)
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
if (debug)
break;
#endif
/* FALLTHROUGH */
case SIGTERM:
if (iflag)
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (mflag)
action = S_IGN;
break;
#endif
}
}
t = &sigmode[signo - 1];
tsig = *t;
if (tsig == 0) {
/*
* current setting unknown
*/
if (!getsigaction(signo, &sigact)) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
return 0;
}
if (sigact == SIG_IGN) {
/*
* POSIX 3.14.13 states that non-interactive shells
* should ignore trap commands for signals that were
* ignored upon entry, and leaves the behavior
* unspecified for interactive shells. On interactive
* shells, or if job control is on, and we have a job
* control related signal, we allow the trap to work.
*
* This change allows us to be POSIX compliant, and
* at the same time override the default behavior if
* we need to by setting the interactive flag.
*/
if ((mflag && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) || iflag) {
tsig = S_IGN;
} else
tsig = S_HARD_IGN;
} else {
tsig = S_RESET; /* force to be set */
}
}
if (tsig == S_HARD_IGN || tsig == action)
return 0;
switch (action) {
case S_DFL: sigact = SIG_DFL; break;
case S_CATCH: sigact = onsig; break;
case S_IGN: sigact = SIG_IGN; break;
}
sig = signal(signo, sigact);
if (sig != SIG_ERR) {
sigset_t ss;
if (!vforked)
*t = action;
if (action == S_CATCH)
(void)siginterrupt(signo, 1);
/*
* If our parent accidentally blocked signals for
* us make sure we unblock them
*/
(void)sigemptyset(&ss);
(void)sigaddset(&ss, signo);
(void)sigprocmask(SIG_UNBLOCK, &ss, NULL);
}
return sig;
}
/*
* Set the signal handler for the specified signal. The routine figures
* out what it should be set to.
*/
void
setsignal(int signo, int vforked)
{
int action;
sig_t sigact = SIG_DFL, sig;
char *t, tsig;
if ((t = trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
VTRACE(DBG_TRAP, ("setsignal(%d%s) -> %d", signo,
vforked ? ", VF" : "", action));
if (rootshell && !vforked && action == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag || minusc || sflag == 0)
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
if (debug)
break;
#endif
/* FALLTHROUGH */
case SIGTERM:
if (rootshell && iflag)
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (rootshell && mflag)
action = S_IGN;
break;
#endif
}
}
/*
* Never let users futz with SIGCHLD
* instead we will give them pseudo SIGCHLD's
* when background jobs complete.
*/
if (signo == SIGCHLD)
action = S_DFL;
VTRACE(DBG_TRAP, (" -> %d", action));
t = &sigmode[signo];
tsig = *t;
if (tsig == 0) {
/*
* current setting unknown
*/
if (!getsigaction(signo, &sigact)) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
VTRACE(DBG_TRAP, (" getsigaction (%d)\n", errno));
return;
}
VTRACE(DBG_TRAP, (" [%s]%s%s", sigact==SIG_IGN ? "IGN" :
sigact==SIG_DFL ? "DFL" : "caught",
iflag ? "i" : "", mflag ? "m" : ""));
if (sigact == SIG_IGN) {
/*
* POSIX 3.14.13 states that non-interactive shells
* should ignore trap commands for signals that were
* ignored upon entry, and leaves the behavior
* unspecified for interactive shells. On interactive
* shells, or if job control is on, and we have a job
* control related signal, we allow the trap to work.
*
* This change allows us to be POSIX compliant, and
* at the same time override the default behavior if
* we need to by setting the interactive flag.
*/
if ((mflag && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) || iflag) {
tsig = S_IGN;
} else
tsig = S_HARD_IGN;
} else {
tsig = S_RESET; /* force to be set */
}
}
VTRACE(DBG_TRAP, (" tsig=%d\n", tsig));
if (tsig == S_HARD_IGN || tsig == action)
return;
switch (action) {
case S_DFL: sigact = SIG_DFL; break;
case S_CATCH: sigact = onsig; break;
case S_IGN: sigact = SIG_IGN; break;
}
sig = signal(signo, sigact);
if (sig != SIG_ERR) {
sigset_t ss;
if (!vforked)
*t = action;
if (action == S_CATCH)
(void)siginterrupt(signo, 1);
/*
* If our parent accidentally blocked signals for
* us make sure we unblock them
*/
(void)sigemptyset(&ss);
(void)sigaddset(&ss, signo);
(void)sigprocmask(SIG_UNBLOCK, &ss, NULL);
}
return;
}
