#define SIGPROP
#include <sys/param.h>
#include <sys/resourcevar.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/acct.h>
#include <sys/file_internal.h>
#include <sys/kernel.h>
#include <sys/wait.h>
#include <sys/signalvar.h>
#if KTRACE
#include <sys/ktrace.h>
#endif
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/lock.h>
#include <sys/kdebug.h>
#include <sys/mount.h>
#include <sys/sysproto.h>
#include <bsm/audit_kernel.h>
#include <machine/spl.h>
#include <kern/cpu_number.h>
#include <sys/vm.h>
#include <sys/user.h>
#include <kern/ast.h>
#include <kern/lock.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/thread_call.h>
#include <mach/exception.h>
#include <mach/task.h>
#include <mach/thread_act.h>
extern int thread_enable_fpe(thread_t act, int onoff);
extern void unix_syscall_return(int error);
extern thread_t port_name_to_thread(mach_port_name_t port_name);
extern kern_return_t check_actforsig(task_t task, thread_t thread, int setast);
extern kern_return_t get_signalact(task_t , thread_t *, int);
extern boolean_t thread_should_abort(thread_t);
extern unsigned int get_useraddr(void);
extern void doexception(int exc, int code, int sub);
void stop(struct proc *p);
int cansignal(struct proc *, kauth_cred_t, struct proc *, int);
int killpg1(struct proc *, int, int, int);
void sigexit_locked(struct proc *, int);
int setsigvec(struct proc *, int, struct __user_sigaction *);
void exit1(struct proc *, int, int *);
void psignal_uthread(thread_t, int);
kern_return_t do_bsdexception(int, int, int);
void __posix_sem_syscall_return(kern_return_t);
kern_return_t semaphore_timedwait_signal_trap_internal(void *, void *,time_t, int32_t, void (*)(int));
kern_return_t semaphore_timedwait_trap_internal(void *, time_t, int32_t, void (*)(int));
kern_return_t semaphore_wait_signal_trap_internal(void *, void *, void (*)(int));
kern_return_t semaphore_wait_trap_internal(void *, void (*)(int));
static int filt_sigattach(struct knote *kn);
static void filt_sigdetach(struct knote *kn);
static int filt_signal(struct knote *kn, long hint);
struct filterops sig_filtops =
{ 0, filt_sigattach, filt_sigdetach, filt_signal };
static void
sigaltstack_64to32(struct user_sigaltstack *in, struct sigaltstack *out)
{
out->ss_sp = CAST_DOWN(void *,in->ss_sp);
out->ss_size = in->ss_size;
out->ss_flags = in->ss_flags;
}
static void
sigaltstack_32to64(struct sigaltstack *in, struct user_sigaltstack *out)
{
out->ss_flags = in->ss_flags;
out->ss_size = in->ss_size;
out->ss_sp = CAST_USER_ADDR_T(in->ss_sp);
}
static void
sigaction_64to32(struct user_sigaction *in, struct sigaction *out)
{
out->__sigaction_u.__sa_handler = CAST_DOWN(sig_t,in->__sigaction_u.__sa_handler);
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
static void
__sigaction_32to64(struct __sigaction *in, struct __user_sigaction *out)
{
out->__sigaction_u.__sa_handler = CAST_USER_ADDR_T(in->__sigaction_u.__sa_handler);
out->sa_tramp = CAST_USER_ADDR_T(in->sa_tramp);
out->sa_mask = in->sa_mask;
out->sa_flags = in->sa_flags;
}
#if SIGNAL_DEBUG
void ram_printf(int);
int ram_debug=0;
unsigned int rdebug_proc=0;
void
ram_printf(int x)
{
printf("x is %d",x);
}
#endif
int
signal_lock(struct proc *p)
{
int error = 0;
#if DIAGNOSTIC
#if SIGNAL_DEBUG
#ifdef __ppc__
{
int register sp, *fp, numsaved;
__asm__ volatile("mr %0,r1" : "=r" (sp));
fp = (int *)*((int *)sp);
for (numsaved = 0; numsaved < 3; numsaved++) {
p->lockpc[numsaved] = fp[2];
if ((int)fp <= 0)
break;
fp = (int *)*fp;
}
}
#endif
#endif
#endif
siglock_retry:
error = lockmgr((struct lock__bsd__ *)&p->signal_lock[0], LK_EXCLUSIVE, 0, (struct proc *)0);
if (error == EINTR)
goto siglock_retry;
return(error);
}
int
signal_unlock(struct proc *p)
{
#if DIAGNOSTIC
#if SIGNAL_DEBUG
#ifdef __ppc__
{
int register sp, *fp, numsaved;
__asm__ volatile("mr %0,r1" : "=r" (sp));
fp = (int *)*((int *)sp);
for (numsaved = 0; numsaved < 3; numsaved++) {
p->unlockpc[numsaved] = fp[2];
if ((int)fp <= 0)
break;
fp = (int *)*fp;
}
}
#endif
#endif
#endif
return(lockmgr((struct lock__bsd__ *)&p->signal_lock[0], LK_RELEASE, (simple_lock_t)0, (struct proc *)0));
}
void
signal_setast(sig_actthread)
thread_t sig_actthread;
{
act_set_astbsd(sig_actthread);
}
int
cansignal(p, uc, q, signum)
struct proc *p;
kauth_cred_t uc;
struct proc *q;
int signum;
{
if (p == q)
return(1);
if (!suser(uc, NULL))
return (1);
if (signum == SIGCONT && q->p_session == p->p_session)
return (1);
if (q->p_flag & P_SUGID) {
switch (signum) {
case 0:
case SIGKILL:
case SIGINT:
case SIGTERM:
case SIGSTOP:
case SIGTTIN:
case SIGTTOU:
case SIGTSTP:
case SIGHUP:
case SIGUSR1:
case SIGUSR2:
if (uc->cr_ruid == q->p_ucred->cr_ruid ||
kauth_cred_getuid(uc) == q->p_ucred->cr_ruid ||
uc->cr_ruid == kauth_cred_getuid(q->p_ucred) ||
kauth_cred_getuid(uc) == kauth_cred_getuid(q->p_ucred))
return (1);
}
return (0);
}
if (uc->cr_ruid == q->p_ucred->cr_ruid ||
uc->cr_ruid == q->p_ucred->cr_svuid ||
kauth_cred_getuid(uc) == q->p_ucred->cr_ruid ||
kauth_cred_getuid(uc) == q->p_ucred->cr_svuid ||
uc->cr_ruid == kauth_cred_getuid(q->p_ucred) ||
kauth_cred_getuid(uc) == kauth_cred_getuid(q->p_ucred))
return (1);
return (0);
}
int
sigaction(struct proc *p, register struct sigaction_args *uap, __unused register_t *retval)
{
struct user_sigaction vec;
struct __user_sigaction __vec;
struct user_sigaction *sa = &vec;
register struct sigacts *ps = p->p_sigacts;
register int signum;
int bit, error=0;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
return (EINVAL);
if (uap->osa) {
sa->sa_handler = ps->ps_sigact[signum];
sa->sa_mask = ps->ps_catchmask[signum];
bit = sigmask(signum);
sa->sa_flags = 0;
if ((ps->ps_sigonstack & bit) != 0)
sa->sa_flags |= SA_ONSTACK;
if ((ps->ps_sigintr & bit) == 0)
sa->sa_flags |= SA_RESTART;
if (ps->ps_siginfo & bit)
sa->sa_flags |= SA_SIGINFO;
if (ps->ps_signodefer & bit)
sa->sa_flags |= SA_NODEFER;
if (ps->ps_64regset & bit)
sa->sa_flags |= SA_64REGSET;
if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDSTOP))
sa->sa_flags |= SA_NOCLDSTOP;
if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDWAIT))
sa->sa_flags |= SA_NOCLDWAIT;
if (IS_64BIT_PROCESS(p)) {
error = copyout(sa, uap->osa, sizeof(struct user_sigaction));
} else {
struct sigaction vec32;
sigaction_64to32(sa, &vec32);
error = copyout(&vec32, uap->osa, sizeof(struct sigaction));
}
if (error)
return (error);
}
if (uap->nsa) {
if (IS_64BIT_PROCESS(p)) {
error = copyin(uap->nsa, &__vec, sizeof(struct __user_sigaction));
} else {
struct __sigaction __vec32;
error = copyin(uap->nsa, &__vec32, sizeof(struct __sigaction));
__sigaction_32to64(&__vec32, &__vec);
}
if (error)
return (error);
error = setsigvec(p, signum, &__vec);
}
return (error);
}
int
clear_procsiglist(struct proc *p, int bit)
{
struct uthread * uth;
thread_t thact;
signal_lock(p);
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_siglist &= ~bit;
}
p->p_siglist &= ~bit;
signal_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_siglist &= ~bit;
}
p->p_siglist &= ~bit;
signal_unlock(p);
return(0);
}
static int
unblock_procsigmask(struct proc *p, int bit)
{
struct uthread * uth;
thread_t thact;
signal_lock(p);
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask &= ~bit;
}
p->p_sigmask &= ~bit;
signal_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask &= ~bit;
}
p->p_sigmask &= ~bit;
signal_unlock(p);
return(0);
}
static int
block_procsigmask(struct proc *p, int bit)
{
struct uthread * uth;
thread_t thact;
signal_lock(p);
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask |= bit;
}
p->p_sigmask |= bit;
signal_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask |= bit;
}
p->p_sigmask |= bit;
signal_unlock(p);
return(0);
}
int
set_procsigmask(struct proc *p, int bit)
{
struct uthread * uth;
thread_t thact;
signal_lock(p);
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
thact = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(thact);
if (uth) {
uth->uu_sigmask = bit;
}
p->p_sigmask = bit;
signal_unlock(p);
return(0);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
uth->uu_sigmask = bit;
}
p->p_sigmask = bit;
signal_unlock(p);
return(0);
}
int
setsigvec(struct proc *p, int signum, struct __user_sigaction *sa)
{
register struct sigacts *ps = p->p_sigacts;
register int bit;
if ((signum == SIGKILL || signum == SIGSTOP) &&
sa->sa_handler != SIG_DFL)
return(EINVAL);
bit = sigmask(signum);
ps->ps_sigact[signum] = sa->sa_handler;
ps->ps_trampact[signum] = sa->sa_tramp;
ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask;
if (sa->sa_flags & SA_SIGINFO)
ps->ps_siginfo |= bit;
else
ps->ps_siginfo &= ~bit;
if (sa->sa_flags & SA_64REGSET)
ps->ps_64regset |= bit;
else
ps->ps_64regset &= ~bit;
if ((sa->sa_flags & SA_RESTART) == 0)
ps->ps_sigintr |= bit;
else
ps->ps_sigintr &= ~bit;
if (sa->sa_flags & SA_ONSTACK)
ps->ps_sigonstack |= bit;
else
ps->ps_sigonstack &= ~bit;
if (sa->sa_flags & SA_USERTRAMP)
ps->ps_usertramp |= bit;
else
ps->ps_usertramp &= ~bit;
if (sa->sa_flags & SA_RESETHAND)
ps->ps_sigreset |= bit;
else
ps->ps_sigreset &= ~bit;
if (sa->sa_flags & SA_NODEFER)
ps->ps_signodefer |= bit;
else
ps->ps_signodefer &= ~bit;
if (signum == SIGCHLD) {
if (sa->sa_flags & SA_NOCLDSTOP)
p->p_flag |= P_NOCLDSTOP;
else
p->p_flag &= ~P_NOCLDSTOP;
if ((sa->sa_flags & SA_NOCLDWAIT) || (sa->sa_handler == SIG_IGN))
p->p_flag |= P_NOCLDWAIT;
else
p->p_flag &= ~P_NOCLDWAIT;
}
#ifdef __ppc__
if (signum == SIGFPE) {
if (sa->sa_handler == SIG_DFL || sa->sa_handler == SIG_IGN)
thread_enable_fpe(current_thread(), 0);
else
thread_enable_fpe(current_thread(), 1);
}
#endif
if (sa->sa_handler == SIG_IGN ||
(sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) {
clear_procsiglist(p, bit);
if (signum != SIGCONT)
p->p_sigignore |= bit;
p->p_sigcatch &= ~bit;
} else {
p->p_sigignore &= ~bit;
if (sa->sa_handler == SIG_DFL)
p->p_sigcatch &= ~bit;
else
p->p_sigcatch |= bit;
}
return(0);
}
void
siginit(p)
struct proc *p;
{
register int i;
for (i = 0; i < NSIG; i++)
if (sigprop[i] & SA_IGNORE && i != SIGCONT)
p->p_sigignore |= sigmask(i);
}
void
execsigs(p, thr_act)
register struct proc *p;
register thread_t thr_act;
{
register struct sigacts *ps = p->p_sigacts;
register int nc, mask;
struct uthread *ut;
while (p->p_sigcatch) {
nc = ffs((long)p->p_sigcatch);
mask = sigmask(nc);
p->p_sigcatch &= ~mask;
if (sigprop[nc] & SA_IGNORE) {
if (nc != SIGCONT)
p->p_sigignore |= mask;
if (thr_act){
ut = (struct uthread *)get_bsdthread_info(thr_act);
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
} else
clear_procsiglist(p, mask);
}
ps->ps_sigact[nc] = SIG_DFL;
}
ps->ps_sigstk.ss_flags = SA_DISABLE;
ps->ps_sigstk.ss_size = 0;
ps->ps_sigstk.ss_sp = USER_ADDR_NULL;
ps->ps_flags = 0;
}
int
sigprocmask(register struct proc *p, struct sigprocmask_args *uap, __unused register_t *retval)
{
int error = 0;
sigset_t oldmask, nmask;
user_addr_t omask = uap->omask;
struct uthread *ut;
ut = (struct uthread *)get_bsdthread_info(current_thread());
oldmask = ut->uu_sigmask;
if (uap->mask == USER_ADDR_NULL) {
goto out;
}
error = copyin(uap->mask, &nmask, sizeof(sigset_t));
if (error)
goto out;
switch (uap->how) {
case SIG_BLOCK:
block_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
case SIG_UNBLOCK:
unblock_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
case SIG_SETMASK:
set_procsigmask(p, (nmask & ~sigcantmask));
signal_setast(current_thread());
break;
default:
error = EINVAL;
break;
}
out:
if (!error && omask != USER_ADDR_NULL)
copyout(&oldmask, omask, sizeof(sigset_t));
return (error);
}
int
sigpending(__unused struct proc *p, register struct sigpending_args *uap, __unused register_t *retval)
{
struct uthread *ut;
sigset_t pendlist;
ut = (struct uthread *)get_bsdthread_info(current_thread());
pendlist = ut->uu_siglist;
if (uap->osv)
copyout(&pendlist, uap->osv, sizeof(sigset_t));
return(0);
}
static int
sigcontinue(__unused int error)
{
unix_syscall_return(EINTR);
}
int
sigsuspend(register struct proc *p, struct sigsuspend_args *uap, __unused register_t *retval)
{
struct uthread *ut;
ut = (struct uthread *)get_bsdthread_info(current_thread());
ut->uu_oldmask = ut->uu_sigmask;
ut->uu_flag |= UT_SAS_OLDMASK;
ut->uu_sigmask = (uap->mask & ~sigcantmask);
(void) tsleep0((caddr_t) p, PPAUSE|PCATCH, "pause", 0, sigcontinue);
return (EINTR);
}
int
__disable_threadsignal(struct proc *p,
__unused register struct __disable_threadsignal_args *uap,
__unused register_t *retval)
{
struct uthread *uth;
uth = (struct uthread *)get_bsdthread_info(current_thread());
signal_lock(p);
uth->uu_flag |= UT_NO_SIGMASK;
signal_unlock(p);
return(0);
}
int
__pthread_markcancel(p, uap, retval)
struct proc *p;
register struct __pthread_markcancel_args *uap;
register_t *retval;
{
thread_act_t target_act;
int error = 0;
struct uthread *uth;
target_act = (thread_act_t)port_name_to_thread(uap->thread_port);
if (target_act == THR_ACT_NULL)
return (ESRCH);
uth = (struct uthread *)get_bsdthread_info(target_act);
if ((uth->uu_flag & (P_VFORK | UT_CANCEL | UT_CANCELED )) == 0) {
uth->uu_flag |= (UT_CANCEL | UT_NO_SIGMASK);
if (((uth->uu_flag & UT_NOTCANCELPT) == 0)
&& ((uth->uu_flag & UT_CANCELDISABLE) == 0))
thread_abort_safely(target_act);
}
thread_deallocate(target_act);
return (error);
}
int
__pthread_canceled(p, uap, retval)
struct proc *p;
register struct __pthread_canceled_args *uap;
register_t *retval;
{
thread_act_t thr_act;
struct uthread *uth;
int action = uap->action;
thr_act = current_act();
uth = (struct uthread *)get_bsdthread_info(thr_act);
switch (action) {
case 1:
uth->uu_flag &= ~UT_CANCELDISABLE;
return(0);
case 2:
uth->uu_flag |= UT_CANCELDISABLE;
return(0);
case 0:
default:
if((uth->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
uth->uu_flag &= ~UT_CANCEL;
uth->uu_flag |= (UT_CANCELED | UT_NO_SIGMASK);
return(0);
}
return(EINVAL);
}
return(EINVAL);
}
void
__posix_sem_syscall_return(kern_return_t kern_result)
{
int error = 0;
if (kern_result == KERN_SUCCESS)
error = 0;
else if (kern_result == KERN_ABORTED)
error = EINTR;
else if (kern_result == KERN_OPERATION_TIMED_OUT)
error = ETIMEDOUT;
else
error = EINVAL;
unix_syscall_return(error);
}
int
__semwait_signal(p, uap, retval)
struct proc *p;
register struct __semwait_signal_args *uap;
register_t *retval;
{
kern_return_t kern_result;
mach_timespec_t then;
struct timespec now;
if(uap->timeout) {
if (uap->relative) {
then.tv_sec = uap->tv_sec;
then.tv_nsec = uap->tv_nsec;
} else {
nanotime(&now);
then.tv_sec = uap->tv_sec - now.tv_sec;
then.tv_nsec = uap->tv_nsec - now.tv_nsec;
if (then.tv_nsec < 0) {
then.tv_nsec += NSEC_PER_SEC;
then.tv_sec--;
}
}
if (uap->mutex_sem == (void *)NULL)
kern_result = semaphore_timedwait_trap_internal(uap->cond_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
else
kern_result = semaphore_timedwait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
} else {
if (uap->mutex_sem == (void *)NULL)
kern_result = semaphore_wait_trap_internal(uap->cond_sem, __posix_sem_syscall_return);
else
kern_result = semaphore_wait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, __posix_sem_syscall_return);
}
out:
if (kern_result == KERN_SUCCESS)
return(0);
else if (kern_result == KERN_ABORTED)
return(EINTR);
else if (kern_result == KERN_OPERATION_TIMED_OUT)
return(ETIMEDOUT);
else
return(EINVAL);
}
int
__pthread_kill(__unused struct proc *p,
register struct __pthread_kill_args *uap,
__unused register_t *retval)
{
thread_t target_act;
int error = 0;
int signum = uap->sig;
struct uthread *uth;
target_act = (thread_t)port_name_to_thread(uap->thread_port);
if (target_act == THREAD_NULL)
return (ESRCH);
if ((u_int)signum >= NSIG) {
error = EINVAL;
goto out;
}
uth = (struct uthread *)get_bsdthread_info(target_act);
if (uth->uu_flag & UT_NO_SIGMASK) {
error = ESRCH;
goto out;
}
if (signum)
psignal_uthread(target_act, signum);
out:
thread_deallocate(target_act);
return (error);
}
int
pthread_sigmask(__unused register struct proc *p,
register struct pthread_sigmask_args *uap,
__unused register_t *retval)
{
user_addr_t set = uap->set;
user_addr_t oset = uap->oset;
sigset_t nset;
int error = 0;
struct uthread *ut;
sigset_t oldset;
ut = (struct uthread *)get_bsdthread_info(current_thread());
oldset = ut->uu_sigmask;
if (set == USER_ADDR_NULL) {
goto out;
}
error = copyin(set, &nset, sizeof(sigset_t));
if (error)
goto out;
switch (uap->how) {
case SIG_BLOCK:
ut->uu_sigmask |= (nset & ~sigcantmask);
break;
case SIG_UNBLOCK:
ut->uu_sigmask &= ~(nset);
signal_setast(current_thread());
break;
case SIG_SETMASK:
ut->uu_sigmask = (nset & ~sigcantmask);
signal_setast(current_thread());
break;
default:
error = EINVAL;
}
out:
if (!error && oset != USER_ADDR_NULL)
copyout(&oldset, oset, sizeof(sigset_t));
return(error);
}
int
sigwait(register struct proc *p, register struct sigwait_args *uap, __unused register_t *retval)
{
struct uthread *ut;
struct uthread *uth;
int error = 0;
sigset_t mask;
sigset_t siglist;
sigset_t sigw=0;
int signum;
ut = (struct uthread *)get_bsdthread_info(current_thread());
if (uap->set == USER_ADDR_NULL)
return(EINVAL);
error = copyin(uap->set, &mask, sizeof(sigset_t));
if (error)
return(error);
siglist = (mask & ~sigcantmask);
if (siglist == 0)
return(EINVAL);
signal_lock(p);
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
signal_unlock(p);
return(EINVAL);
} else {
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
if ( (sigw = uth->uu_siglist & siglist) ) {
break;
}
}
}
signal_unlock(p);
if (sigw) {
goto sigwait1;
}
ut->uu_oldmask = ut->uu_sigmask;
ut->uu_flag |= UT_SAS_OLDMASK;
if (siglist == (sigset_t)0)
return(EINVAL);
ut->uu_sigmask = ~(siglist|sigcantmask);
ut->uu_sigwait = siglist;
error = tsleep((caddr_t)&ut->uu_sigwait, PPAUSE|PCATCH, "pause", 0);
if ((error == EINTR) || (error == ERESTART))
error = 0;
sigw = (ut->uu_sigwait & siglist);
ut->uu_sigmask = ut->uu_oldmask;
ut->uu_oldmask = 0;
ut->uu_flag &= ~UT_SAS_OLDMASK;
sigwait1:
ut->uu_sigwait = 0;
if (!error) {
signum = ffs((unsigned int)sigw);
if (!signum)
panic("sigwait with no signal wakeup");
ut->uu_siglist &= ~(sigmask(signum));
if (uap->sig != USER_ADDR_NULL)
error = copyout(&signum, uap->sig, sizeof(int));
}
return(error);
}
int
sigaltstack(struct proc *p, register struct sigaltstack_args *uap, __unused register_t *retval)
{
struct sigacts *psp;
struct user_sigaltstack ss;
int error;
psp = p->p_sigacts;
if ((psp->ps_flags & SAS_ALTSTACK) == 0)
psp->ps_sigstk.ss_flags |= SA_DISABLE;
if (uap->oss) {
if (IS_64BIT_PROCESS(p)) {
error = copyout(&psp->ps_sigstk, uap->oss, sizeof(struct user_sigaltstack));
} else {
struct sigaltstack ss32;
sigaltstack_64to32(&psp->ps_sigstk, &ss32);
error = copyout(&ss32, uap->oss, sizeof(struct sigaltstack));
}
if (error)
return (error);
}
if (uap->nss == USER_ADDR_NULL)
return (0);
if (IS_64BIT_PROCESS(p)) {
error = copyin(uap->nss, &ss, sizeof(struct user_sigaltstack));
} else {
struct sigaltstack ss32;
error = copyin(uap->nss, &ss32, sizeof(struct sigaltstack));
sigaltstack_32to64(&ss32,&ss);
}
if (error)
return (error);
if ((ss.ss_flags & ~SA_DISABLE) != 0) {
return(EINVAL);
}
if (ss.ss_flags & SA_DISABLE) {
if (psp->ps_sigstk.ss_flags & SA_ONSTACK)
return (EINVAL);
psp->ps_flags &= ~SAS_ALTSTACK;
psp->ps_sigstk.ss_flags = ss.ss_flags;
return (0);
}
#define OLDMINSIGSTKSZ 8*1024
if (ss.ss_size < OLDMINSIGSTKSZ)
return (ENOMEM);
psp->ps_flags |= SAS_ALTSTACK;
psp->ps_sigstk= ss;
return (0);
}
int
kill(struct proc *cp, struct kill_args *uap, __unused register_t *retval)
{
register struct proc *p;
kauth_cred_t uc = kauth_cred_get();
AUDIT_ARG(pid, uap->pid);
AUDIT_ARG(signum, uap->signum);
if ((u_int)uap->signum >= NSIG)
return (EINVAL);
if (uap->pid > 0) {
if ((p = proc_findref(uap->pid)) == NULL) {
if ((p = pzfind(uap->pid)) != NULL) {
return (0);
}
return (ESRCH);
}
AUDIT_ARG(process, p);
if (!cansignal(cp, uc, p, uap->signum)) {
proc_dropref(p);
return(EPERM);
}
if (uap->signum)
psignal(p, uap->signum);
proc_dropref(p);
return (0);
}
switch (uap->pid) {
case -1:
return (killpg1(cp, uap->signum, 0, 1));
case 0:
return (killpg1(cp, uap->signum, 0, 0));
default:
return (killpg1(cp, uap->signum, -(uap->pid), 0));
}
}
int
killpg1(cp, signum, pgid, all)
register struct proc *cp;
int signum, pgid, all;
{
register struct proc *p;
kauth_cred_t uc = cp->p_ucred;
struct pgrp *pgrp;
int nfound = 0;
if (all) {
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
p == cp || !cansignal(cp, uc, p, signum))
continue;
nfound++;
if (signum)
psignal(p, signum);
}
} else {
if (pgid == 0)
pgrp = cp->p_pgrp;
else {
pgrp = pgfind(pgid);
if (pgrp == NULL)
return (ESRCH);
}
for (p = pgrp->pg_members.lh_first; p != 0;
p = p->p_pglist.le_next) {
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
p->p_stat == SZOMB ||
!cansignal(cp, uc, p, signum))
continue;
nfound++;
if (signum)
psignal(p, signum);
}
}
return (nfound ? 0 : ESRCH);
}
void
gsignal(pgid, signum)
int pgid, signum;
{
struct pgrp *pgrp;
if (pgid && (pgrp = pgfind(pgid)))
pgsignal(pgrp, signum, 0);
}
void
pgsignal(pgrp, signum, checkctty)
struct pgrp *pgrp;
int signum, checkctty;
{
register struct proc *p;
if (pgrp)
for (p = pgrp->pg_members.lh_first; p != 0;
p = p->p_pglist.le_next)
if (checkctty == 0 || p->p_flag & P_CONTROLT)
psignal(p, signum);
}
void
tty_pgsignal(pgrp, signum)
struct pgrp *pgrp;
int signum;
{
register struct proc *p;
if (pgrp)
for (p = pgrp->pg_members.lh_first; p != 0;
p = p->p_pglist.le_next)
if ((p->p_flag & P_TTYSLEEP) && (p->p_flag & P_CONTROLT))
psignal(p, signum);
}
void
threadsignal(thread_t sig_actthread, int signum, u_long code)
{
register struct uthread *uth;
register struct task * sig_task;
register struct proc *p ;
int mask;
if ((u_int)signum >= NSIG || signum == 0)
return;
mask = sigmask(signum);
if ((mask & threadmask) == 0)
return;
sig_task = get_threadtask(sig_actthread);
p = (struct proc *)(get_bsdtask_info(sig_task));
uth = get_bsdthread_info(sig_actthread);
if (uth && (uth->uu_flag & UT_VFORK))
p = uth->uu_proc;
if (!(p->p_flag & P_TRACED) && (p->p_sigignore & mask))
return;
uth->uu_siglist |= mask;
p->p_siglist |= mask;
uth->uu_code = code;
signal_setast(sig_actthread);
}
void
psignal(p, signum)
register struct proc *p;
register int signum;
{
psignal_lock(p, signum, 1);
}
void
psignal_vfork(struct proc *p, task_t new_task, thread_t thr_act, int signum)
{
register int prop;
register sig_t action;
int mask;
struct uthread *uth;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if ((new_task == TASK_NULL) || (thr_act == (thread_t)NULL) || is_kerneltask(new_task))
return;
uth = get_bsdthread_info(thr_act);
signal_lock(p);
action = SIG_DFL;
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(p->p_flag & P_TRACED) == 0)
p->p_nice = NZERO;
if (prop & SA_CONT) {
p->p_siglist &= ~stopsigmask;
uth->uu_siglist &= ~stopsigmask;
}
if (prop & SA_STOP) {
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
action == SIG_DFL)
goto psigout;
uth->uu_siglist &= ~contsigmask;
p->p_siglist &= ~contsigmask;
}
uth->uu_siglist |= mask;
p->p_siglist |= mask;
act_set_astbsd(thr_act);
if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
p->p_nice = NZERO;
}
if (p->p_flag & P_TRACED) {
if (p->p_stat != SSTOP)
goto run;
else
goto psigout;
}
run:
if (p->p_stat == SSTOP) {
if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0) {
uth->uu_siglist |= sigmask(p->p_xstat);
p->p_siglist |= mask;
}
}
p->p_stat = SRUN;
psigout:
signal_unlock(p);
}
static thread_t
get_signalthread(struct proc *p, int signum)
{
struct uthread *uth;
thread_t thr_act;
sigset_t mask = sigmask(signum);
thread_t sig_thread_act;
struct task * sig_task = p->task;
kern_return_t kret;
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
sig_thread_act = p->p_vforkact;
kret = check_actforsig(sig_task, sig_thread_act, 1);
if (kret == KERN_SUCCESS)
return(sig_thread_act);
else
return(THREAD_NULL);
}
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
if(((uth->uu_flag & UT_NO_SIGMASK)== 0) &&
(((uth->uu_sigmask & mask) == 0) || (uth->uu_sigwait & mask))) {
if (check_actforsig(p->task, uth->uu_act, 1) == KERN_SUCCESS)
return(uth->uu_act);
}
}
if (get_signalact(p->task, &thr_act, 1) == KERN_SUCCESS) {
return(thr_act);
}
return(THREAD_NULL);
}
void
psignal_lock(p, signum, withlock)
register struct proc *p;
register int signum;
register int withlock;
{
register int s, prop;
register sig_t action;
thread_t sig_thread_act;
register task_t sig_task;
int mask;
struct uthread *uth;
boolean_t funnel_state = FALSE;
int sw_funnel = 0;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if (thread_funnel_get() == (funnel_t *)0) {
sw_funnel = 1;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
}
if (((sig_task = p->task) == TASK_NULL) || is_kerneltask(sig_task)) {
if (sw_funnel)
thread_funnel_set(kernel_flock, funnel_state);
return;
}
s = splhigh();
KNOTE(&p->p_klist, NOTE_SIGNAL | signum);
splx(s);
if (ISSET(p->p_flag, P_REBOOT)) {
if (sw_funnel)
thread_funnel_set(kernel_flock, funnel_state);
return;
}
if (withlock)
signal_lock(p);
if (((p->p_flag & P_TRACED) == 0) && (p->p_sigignore & mask))
goto psigout;
sig_thread_act = get_signalthread(p, signum);
if (sig_thread_act == THREAD_NULL) {
#if SIGNAL_DEBUG
ram_printf(1);
#endif
goto psigout;
}
uth = get_bsdthread_info(sig_thread_act);
if (p->p_flag & P_TRACED)
action = SIG_DFL;
else {
if (p->p_sigignore & mask)
goto psigout;
if (uth->uu_sigwait & mask)
action = KERN_SIG_WAIT;
else if (uth->uu_sigmask & mask)
action = KERN_SIG_HOLD;
else if (p->p_sigcatch & mask)
action = KERN_SIG_CATCH;
else
action = SIG_DFL;
}
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(p->p_flag & P_TRACED) == 0)
p->p_nice = NZERO;
if (prop & SA_CONT) {
uth->uu_siglist &= ~stopsigmask;
p->p_siglist &= ~stopsigmask;
}
if (prop & SA_STOP) {
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
action == SIG_DFL)
goto psigout;
uth->uu_siglist &= ~contsigmask;
p->p_siglist &= ~contsigmask;
}
uth->uu_siglist |= mask;
p->p_siglist |= mask;
if (action == KERN_SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP)) {
goto psigout;
}
if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
p->p_nice = NZERO;
}
if (p->p_flag & P_TRACED) {
if (p->p_stat != SSTOP)
goto run;
else
goto psigout;
}
if (action == KERN_SIG_WAIT) {
uth->uu_sigwait = mask;
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
wakeup(&uth->uu_sigwait);
if (prop & SA_CONT) {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
goto psigout;
}
if (action != SIG_DFL) {
if (prop & SA_CONT) {
if (p->p_flag & P_TTYSLEEP) {
p->p_flag &= ~P_TTYSLEEP;
wakeup(&p->p_siglist);
} else {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
p->p_stat = SRUN;
} else if (p->p_stat == SSTOP)
goto psigout;
goto run;
} else {
if (mask & stopsigmask) {
if (!(prop & SA_STOP) && p->p_pptr == initproc) {
psignal_lock(p, SIGKILL, 0);
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
goto psigout;
}
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
if (p->p_stat != SSTOP) {
p->p_xstat = signum;
stop(p);
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0) {
struct proc *pp = p->p_pptr;
pp->si_pid = p->p_pid;
pp->si_status = p->p_xstat;
pp->si_code = CLD_STOPPED;
pp->si_uid = p->p_ucred->cr_ruid;
psignal(pp, SIGCHLD);
}
}
goto psigout;
}
switch (signum) {
case SIGKILL:
p->p_stat = SRUN;
thread_abort(sig_thread_act);
goto psigout;
case SIGCONT:
if (p->p_flag & P_TTYSLEEP) {
p->p_flag &= ~P_TTYSLEEP;
wakeup(&p->p_siglist);
} else {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
p->p_stat = SRUN;
goto psigout;
default:
if (p->p_stat == SSTOP)
goto psigout;
goto run;
}
}
run:
if (p->p_stat == SSTOP) {
if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0)
uth->uu_siglist |= sigmask(p->p_xstat);
} else {
p->p_stat = SRUN;
thread_abort_safely(sig_thread_act);
}
psigout:
if (withlock)
signal_unlock(p);
if (sw_funnel)
thread_funnel_set(kernel_flock, funnel_state);
}
void
psignal_uthread(thr_act, signum)
thread_t thr_act;
int signum;
{
struct proc *p;
register int prop;
register sig_t action;
thread_t sig_thread_act;
register task_t sig_task;
int mask;
struct uthread *uth;
kern_return_t kret;
int error = 0;
p = (struct proc *)get_bsdtask_info(get_threadtask(thr_act));
if ((u_int)signum >= NSIG || signum == 0)
panic("Invalid signal number in psignal_uthread");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if (((sig_task = p->task) == TASK_NULL) || is_kerneltask(sig_task)) {
return;
}
sig_thread_act = thr_act;
if (ISSET(p->p_flag, P_REBOOT)) {
return;
}
signal_lock(p);
if (((p->p_flag & P_TRACED) == 0) && (p->p_sigignore & mask))
goto puthout;
kret = check_actforsig(sig_task, sig_thread_act, 1);
if (kret != KERN_SUCCESS) {
error = EINVAL;
goto puthout;
}
uth = get_bsdthread_info(sig_thread_act);
if (p->p_flag & P_TRACED)
action = SIG_DFL;
else {
if (p->p_sigignore & mask)
goto puthout;
if (uth->uu_sigwait & mask)
action = KERN_SIG_WAIT;
else if (uth->uu_sigmask & mask)
action = KERN_SIG_HOLD;
else if (p->p_sigcatch & mask)
action = KERN_SIG_CATCH;
else
action = SIG_DFL;
}
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(p->p_flag & P_TRACED) == 0)
p->p_nice = NZERO;
if (prop & SA_CONT) {
uth->uu_siglist &= ~stopsigmask;
p->p_siglist &= ~stopsigmask;
}
if (prop & SA_STOP) {
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
action == SIG_DFL)
goto puthout;
uth->uu_siglist &= ~contsigmask;
p->p_siglist &= ~contsigmask;
}
uth->uu_siglist |= mask;
p->p_siglist |= mask;
if (action == KERN_SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP))
goto puthout;
if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
p->p_nice = NZERO;
}
if (p->p_flag & P_TRACED) {
if (p->p_stat != SSTOP)
goto psurun;
else
goto puthout;
}
if (action == KERN_SIG_WAIT) {
uth->uu_sigwait = mask;
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
wakeup(&uth->uu_sigwait);
if (prop & SA_CONT) {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
goto puthout;
}
if (action != SIG_DFL) {
if (prop & SA_CONT) {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
goto psurun;
} else {
if (mask & stopsigmask) {
if (!(prop & SA_STOP) && p->p_pptr == initproc) {
psignal_lock(p, SIGKILL, 0);
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
goto puthout;
}
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
if (p->p_stat != SSTOP) {
p->p_xstat = signum;
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0) {
struct proc *pp = p->p_pptr;
pp->si_pid = p->p_pid;
pp->si_status = p->p_xstat;
pp->si_code = CLD_STOPPED;
pp->si_uid = p->p_ucred->cr_ruid;
psignal(pp, SIGCHLD);
}
stop(p);
}
goto puthout;
}
switch (signum) {
case SIGKILL:
p->p_stat = SRUN;
thread_abort(sig_thread_act);
goto puthout;
case SIGCONT:
if (p->p_flag & P_TTYSLEEP) {
p->p_flag &= ~P_TTYSLEEP;
wakeup(&p->p_siglist);
} else {
p->p_flag |= P_CONTINUED;
(void) task_resume(sig_task);
}
uth->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
p->p_stat = SRUN;
goto puthout;
default:
goto psurun;
}
}
psurun:
if (p->p_stat == SSTOP) {
if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0) {
uth->uu_siglist |= sigmask(p->p_xstat);
p->p_siglist |= sigmask(p->p_xstat);
}
} else {
p->p_stat = SRUN;
thread_abort_safely(sig_thread_act);
}
puthout:
signal_unlock(p);
}
__inline__ void
sig_lock_to_exit(struct proc *p)
{
thread_t self = current_thread();
p->exit_thread = self;
(void) task_suspend(p->task);
}
__inline__ int
sig_try_locked(struct proc *p)
{
thread_t self = current_thread();
while (p->sigwait || p->exit_thread) {
if (p->exit_thread) {
if (p->exit_thread != self) {
thread_abort(self);
}
return(0);
}
if(assert_wait_possible()) {
assert_wait((caddr_t)&p->sigwait_thread,
(THREAD_INTERRUPTIBLE));
}
signal_unlock(p);
thread_block(THREAD_CONTINUE_NULL);
signal_lock(p);
if (thread_should_abort(self)) {
return -1;
}
}
return 1;
}
int
issignal(p)
register struct proc *p;
{
register int signum, mask, prop, sigbits;
thread_t cur_act;
struct uthread * ut;
struct proc *pp;
cur_act = current_thread();
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
signal_lock(p);
if (sig_try_locked(p) <= 0) {
signal_unlock(p);
return (0);
}
ut = get_bsdthread_info(cur_act);
for(;;) {
sigbits = ut->uu_siglist & ~ut->uu_sigmask;
if (p->p_flag & P_PPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
signal_unlock(p);
return (0);
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
continue;
}
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
register task_t task;
p->p_xstat = signum;
pp = p->p_pptr;
if (p->p_flag & P_SIGEXC) {
p->sigwait = TRUE;
p->sigwait_thread = cur_act;
p->p_stat = SSTOP;
p->p_flag &= ~(P_WAITED|P_CONTINUED);
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
signal_unlock(p);
do_bsdexception(EXC_SOFTWARE, EXC_SOFT_SIGNAL, signum);
signal_lock(p);
} else {
pp->si_pid = p->p_pid;
pp->si_status = p->p_xstat;
pp->si_code = CLD_TRAPPED;
pp->si_uid = p->p_ucred->cr_ruid;
psignal(pp, SIGCHLD);
task = p->task;
task_hold(task);
p->sigwait = TRUE;
p->sigwait_thread = cur_act;
p->p_stat = SSTOP;
p->p_flag &= ~(P_WAITED|P_CONTINUED);
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
wakeup((caddr_t)p->p_pptr);
signal_unlock(p);
assert_wait((caddr_t)&p->sigwait, (THREAD_INTERRUPTIBLE));
thread_block(THREAD_CONTINUE_NULL);
signal_lock(p);
}
p->sigwait = FALSE;
p->sigwait_thread = NULL;
wakeup((caddr_t)&p->sigwait_thread);
if (ut->uu_siglist & sigmask(SIGKILL)) {
clear_wait(current_thread(), THREAD_INTERRUPTED);
sig_lock_to_exit(p);
signal_unlock(p);
exit1(p,signum, (int *)NULL);
return(0);
}
if (thread_should_abort(current_thread())) {
signal_unlock(p);
return(0);
}
signum = p->p_xstat;
if (signum == 0)
continue;
mask = sigmask(signum);
ut->uu_siglist |= mask;
p->p_siglist |= mask;
if (ut->uu_sigmask & mask)
continue;
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (p->p_pptr->p_pid == 0) {
#if DIAGNOSTIC
printf("Process (pid %d) got signal %d\n",
p->p_pid, signum);
#endif
break;
}
if (prop & SA_STOP) {
if (p->p_flag & P_TRACED ||
(p->p_pgrp->pg_jobc == 0 &&
prop & SA_TTYSTOP))
break;
if (p->p_stat != SSTOP) {
p->p_xstat = signum;
stop(p);
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0) {
pp = p->p_pptr;
pp->si_pid = p->p_pid;
pp->si_status = p->p_xstat;
pp->si_code = CLD_STOPPED;
pp->si_uid = p->p_ucred->cr_ruid;
psignal(pp, SIGCHLD);
}
}
break;
} else if (prop & SA_IGNORE) {
break;
} else {
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
signal_unlock(p);
return (signum);
}
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_flag & P_TRACED) == 0)
printf("issignal\n");
break;
default:
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
signal_unlock(p);
return (signum);
}
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
}
}
int
CURSIG(p)
register struct proc *p;
{
register int signum, mask, prop, sigbits;
thread_t cur_act;
struct uthread * ut;
int retnum = 0;
cur_act = current_thread();
ut = get_bsdthread_info(cur_act);
if (ut->uu_siglist == 0)
return (0);
if (((ut->uu_siglist & ~ut->uu_sigmask) == 0) && ((p->p_flag & P_TRACED) == 0))
return (0);
sigbits = ut->uu_siglist & ~ut->uu_sigmask;
for(;;) {
if (p->p_flag & P_PPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
return (retnum);
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
continue;
}
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
mask = sigmask(signum);
if (ut->uu_sigmask & mask)
continue;
return(signum);
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (p->p_pptr->p_pid == 0) {
#if DIAGNOSTIC
printf("Process (pid %d) got signal %d\n",
p->p_pid, signum);
#endif
break;
}
if (prop & SA_STOP) {
if (p->p_flag & P_TRACED ||
(p->p_pgrp->pg_jobc == 0 &&
prop & SA_TTYSTOP))
break;
retnum = signum;
break;
} else if (prop & SA_IGNORE) {
break;
} else {
return (signum);
}
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_flag & P_TRACED) == 0)
printf("issignal\n");
break;
default:
return (signum);
}
sigbits &= ~mask;
}
}
void
stop(p)
register struct proc *p;
{
p->p_stat = SSTOP;
p->p_flag &= ~(P_WAITED|P_CONTINUED);
if (p->p_pptr->p_stat != SSTOP)
wakeup((caddr_t)p->p_pptr);
(void) task_suspend(p->task);
}
void
postsig(int signum)
{
struct proc *p = current_proc();
struct sigacts *ps = p->p_sigacts;
user_addr_t catcher;
u_long code;
int mask, returnmask;
struct uthread * ut;
#if DIAGNOSTIC
if (signum == 0)
panic("postsig");
if (cpu_number() != master_cpu)
panic("psig not on master");
#endif
signal_lock(p);
if (sig_try_locked(p) <= 0) {
signal_unlock(p);
return;
}
ut = (struct uthread *)get_bsdthread_info(current_thread());
mask = sigmask(signum);
ut->uu_siglist &= ~mask;
p->p_siglist &= ~mask;
catcher = ps->ps_sigact[signum];
#if KTRACE
if (KTRPOINT(p, KTR_PSIG))
ktrpsig(p->p_tracep,
signum, CAST_DOWN(void *,catcher), ut->uu_flag & UT_SAS_OLDMASK ?
&ut->uu_oldmask : &ut->uu_sigmask, 0);
#endif
if (catcher == SIG_DFL) {
sigexit_locked(p, signum);
return;
} else {
#if DIAGNOSTIC
if (catcher == SIG_IGN || (ut->uu_sigmask & mask))
log(LOG_WARNING,
"postsig: processing masked or ignored signal\n");
#endif
if (ut->uu_flag & UT_SAS_OLDMASK) {
returnmask = ut->uu_oldmask;
ut->uu_flag &= ~UT_SAS_OLDMASK;
ut->uu_oldmask = 0;
} else
returnmask = ut->uu_sigmask;
ut->uu_sigmask |= ps->ps_catchmask[signum];
if ((ps->ps_signodefer & mask) == 0)
ut->uu_sigmask |= mask;
if ((signum != SIGILL) && (signum != SIGTRAP) && (ps->ps_sigreset & mask)) {
if ((signum != SIGCONT) && (sigprop[signum] & SA_IGNORE))
p->p_sigignore |= mask;
ps->ps_sigact[signum] = SIG_DFL;
ps->ps_siginfo &= ~mask;
ps->ps_signodefer &= ~mask;
}
#ifdef __ppc__
if (signum == SIGFPE) {
thread_enable_fpe(current_thread(), 0);
}
#endif
if (ps->ps_sig != signum) {
code = 0;
} else {
code = ps->ps_code;
ps->ps_code = 0;
}
p->p_stats->p_ru.ru_nsignals++;
sendsig(p, catcher, signum, returnmask, code);
}
signal_unlock(p);
}
void
sigexit_locked(p, signum)
register struct proc *p;
int signum;
{
sig_lock_to_exit(p);
p->p_acflag |= AXSIG;
if (sigprop[signum] & SA_CORE) {
p->p_sigacts->ps_sig = signum;
signal_unlock(p);
if (coredump(p) == 0)
signum |= WCOREFLAG;
} else
signal_unlock(p);
exit1(p, W_EXITCODE(0, signum), (int *)NULL);
}
static int
filt_sigattach(struct knote *kn)
{
struct proc *p = current_proc();
kn->kn_ptr.p_proc = p;
kn->kn_flags |= EV_CLEAR;
KNOTE_ATTACH(&p->p_klist, kn);
return (0);
}
static void
filt_sigdetach(struct knote *kn)
{
struct proc *p = kn->kn_ptr.p_proc;
KNOTE_DETACH(&p->p_klist, kn);
}
static int
filt_signal(struct knote *kn, long hint)
{
if (hint & NOTE_SIGNAL) {
hint &= ~NOTE_SIGNAL;
if (kn->kn_id == (unsigned int)hint)
kn->kn_data++;
}
return (kn->kn_data != 0);
}
void
bsd_ast(thread_t thr_act)
{
struct proc *p = current_proc();
struct uthread *ut = get_bsdthread_info(thr_act);
int signum;
user_addr_t pc;
boolean_t funnel_state;
static int bsd_init_done = 0;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
if ((p->p_flag & P_OWEUPC) && (p->p_flag & P_PROFIL)) {
pc = get_useraddr();
addupc_task(p, pc, 1);
p->p_flag &= ~P_OWEUPC;
}
if (CHECK_SIGNALS(p, current_thread(), ut)) {
while ( (signum = issignal(p)) )
postsig(signum);
}
if (!bsd_init_done) {
bsd_init_done = 1;
bsdinit_task();
}
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_vtalarm(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGVTALRM, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_xcpu(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGXCPU, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_sigprof(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGPROF, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
pt_setrunnable(struct proc *p)
{
task_t task;
task = p->task;
if (p->p_flag & P_TRACED) {
p->p_stat = SRUN;
if (p->sigwait) {
wakeup((caddr_t)&(p->sigwait));
task_release(task);
}
}
}
kern_return_t
do_bsdexception(
int exc,
int code,
int sub)
{
exception_data_type_t codes[EXCEPTION_CODE_MAX];
codes[0] = code;
codes[1] = sub;
return(bsd_exception(exc, codes, 2));
}
int
proc_pendingsignals(struct proc *p, sigset_t mask)
{
struct uthread * uth;
thread_t th;
sigset_t bits = 0;
int error;
if (p->p_lflag & P_LPEXIT)
return(0);
ppend_retry:
error = lockmgr((struct lock__bsd__ *)&p->signal_lock[0], (LK_EXCLUSIVE | LK_CANRECURSE), 0, (struct proc *)0);
if (error == EINTR)
goto ppend_retry;
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
th = p->p_vforkact;
uth = (struct uthread *)get_bsdthread_info(th);
if (uth) {
bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
goto out;
}
bits = 0;
TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
bits |= (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
out:
signal_unlock(p);
return(bits);
}
int
thread_issignal(proc_t p, thread_t th, sigset_t mask)
{
struct uthread * uth;
sigset_t bits=0;
uth = (struct uthread *)get_bsdthread_info(th);
if (uth) {
bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
return(bits);
}