newlib-cygwin/winsup/cygwin/signal.cc

431 lines
9.4 KiB
C++

/* signal.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
Written by Steve Chamberlain of Cygnus Support, sac@cygnus.com
Significant changes by Sergey Okhapkin <sos@prospect.com.ru>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <errno.h>
#include <stdlib.h>
#include "cygerrno.h"
#include <sys/cygwin.h>
#include "sigproc.h"
#include "pinfo.h"
int sigcatchers; /* FIXME: Not thread safe. */
#define sigtrapped(func) ((func) != SIG_IGN && (func) != SIG_DFL)
static inline void
set_sigcatchers (void (*oldsig) (int), void (*cursig) (int))
{
#ifdef DEBUGGING
int last_sigcatchers = sigcatchers;
#endif
if (!sigtrapped (oldsig) && sigtrapped (cursig))
sigcatchers++;
else if (sigtrapped (oldsig) && !sigtrapped (cursig))
sigcatchers--;
#ifdef DEBUGGING
if (last_sigcatchers != sigcatchers)
sigproc_printf ("last %d, old %d, cur %p, cur %p", last_sigcatchers,
sigcatchers, oldsig, cursig);
#endif
}
extern "C" _sig_func_ptr
signal (int sig, _sig_func_ptr func)
{
sig_dispatch_pending (0);
_sig_func_ptr prev;
/* check that sig is in right range */
if (sig < 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = signal (%d, %p)", sig, func);
return (_sig_func_ptr) SIG_ERR;
}
prev = myself->getsig (sig).sa_handler;
myself->getsig (sig).sa_handler = func;
myself->getsig (sig).sa_mask = 0;
/* SA_RESTART is set to maintain BSD compatible signal behaviour by default.
This is also compatible with the behaviour of signal(2) in Linux. */
myself->getsig (sig).sa_flags |= SA_RESTART;
set_sigcatchers (prev, func);
syscall_printf ("%p = signal (%d, %p)", prev, sig, func);
return prev;
}
extern "C" unsigned int
sleep (unsigned int seconds)
{
int rc;
sig_dispatch_pending (0);
sigframe thisframe (mainthread);
DWORD ms, start_time, end_time;
ms = seconds * 1000;
start_time = GetTickCount ();
end_time = start_time + (seconds * 1000);
syscall_printf ("sleep (%d)", seconds);
rc = WaitForSingleObject (signal_arrived, ms);
DWORD now = GetTickCount ();
if (rc == WAIT_TIMEOUT || now >= end_time)
ms = 0;
else
ms = end_time - now;
if (WaitForSingleObject (signal_arrived, 0) == WAIT_OBJECT_0)
(void) thisframe.call_signal_handler ();
DWORD res = (ms + 500) / 1000;
syscall_printf ("%d = sleep (%d)", res, seconds);
return res;
}
extern "C" unsigned int
usleep (unsigned int useconds)
{
sig_dispatch_pending (0);
syscall_printf ("usleep (%d)", useconds);
WaitForSingleObject (signal_arrived, (useconds + 500) / 1000);
syscall_printf ("0 = usleep (%d)", useconds);
return 0;
}
extern "C" int
sigprocmask (int sig, const sigset_t *set, sigset_t *oldset)
{
sig_dispatch_pending (0);
/* check that sig is in right range */
if (sig < 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = sigprocmask signal %d out of range", sig);
return -1;
}
if (oldset)
*oldset = myself->getsigmask ();
if (set)
{
sigset_t newmask = myself->getsigmask ();
switch (sig)
{
case SIG_BLOCK:
/* add set to current mask */
newmask |= *set;
break;
case SIG_UNBLOCK:
/* remove set from current mask */
newmask &= ~*set;
break;
case SIG_SETMASK:
/* just set it */
newmask = *set;
break;
default:
set_errno (EINVAL);
return -1;
}
(void) set_process_mask (newmask);
}
return 0;
}
static int
kill_worker (pid_t pid, int sig)
{
sig_dispatch_pending (0);
int res = 0;
pinfo dest (pid);
BOOL sendSIGCONT;
if (!dest)
{
set_errno (ESRCH);
return -1;
}
dest->setthread2signal (NULL);
if ((sendSIGCONT = (sig < 0)))
sig = -sig;
#if 0
if (dest == myself && !sendSIGCONT)
dest = myself_nowait_nonmain;
#endif
if (sig == 0)
{
res = proc_exists (dest) ? 0 : -1;
if (res < 0)
set_errno (ESRCH);
}
else if ((res = sig_send (dest, sig)))
{
sigproc_printf ("%d = sig_send, %E ", res);
res = -1;
}
else if (sendSIGCONT)
(void) sig_send (dest, SIGCONT);
syscall_printf ("%d = kill_worker (%d, %d)", res, pid, sig);
return res;
}
int
raise (int sig)
{
return kill (myself->pid, sig);
}
int
kill (pid_t pid, int sig)
{
sigframe thisframe (mainthread);
syscall_printf ("kill (%d, %d)", pid, sig);
/* check that sig is in right range */
if (sig < 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("signal %d out of range", sig);
return -1;
}
/* Silently ignore stop signals from a member of orphaned process group.
FIXME: Why??? */
if (ISSTATE (myself, PID_ORPHANED) &&
(sig == SIGTSTP || sig == SIGTTIN || sig == SIGTTOU))
sig = 0;
return (pid > 0) ? kill_worker (pid, sig) : kill_pgrp (-pid, sig);
}
int
kill_pgrp (pid_t pid, int sig)
{
int res = 0;
int found = 0;
int killself = 0;
sigframe thisframe (mainthread);
sigproc_printf ("pid %d, signal %d", pid, sig);
winpids pids;
for (unsigned i = 0; i < pids.npids; i++)
{
_pinfo *p = pids[i];
if (!proc_exists (p))
continue;
/* Is it a process we want to kill? */
if ((pid == 0 && (p->pgid != myself->pgid || p->ctty != myself->ctty)) ||
(pid > 1 && p->pgid != pid) ||
(sig < 0 && NOTSTATE (p, PID_STOPPED)))
continue;
sigproc_printf ("killing pid %d, pgrp %d, p->ctty %d, myself->ctty %d",
p->pid, p->pgid, p->ctty, myself->ctty);
if (p == myself)
killself++;
else if (kill_worker (p->pid, sig))
res = -1;
found++;
}
if (killself && kill_worker (myself->pid, sig))
res = -1;
if (!found)
{
set_errno (ESRCH);
res = -1;
}
syscall_printf ("%d = kill (%d, %d)", res, pid, sig);
return res;
}
extern "C" int
killpg (pid_t pgrp, int sig)
{
return kill (-pgrp, sig);
}
extern "C" void
abort (void)
{
sig_dispatch_pending (0);
sigframe thisframe (mainthread);
/* Flush all streams as per SUSv2.
From my reading of this document, this isn't strictly correct.
The streams are supposed to be flushed prior to exit. However,
if there is I/O in any signal handler that will not necessarily
be flushed.
However this is the way FreeBSD does it, and it is much easier to
do things this way, so... */
if (_reent_clib ()->__cleanup)
_reent_clib ()->__cleanup (_reent_clib ());
/* Ensure that SIGABRT can be caught regardless of blockage. */
sigset_t sig_mask;
sigfillset (&sig_mask);
sigdelset (&sig_mask, SIGABRT);
set_process_mask (sig_mask);
raise (SIGABRT);
(void) thisframe.call_signal_handler (); /* Call any signal handler */
do_exit (1); /* signal handler didn't exit. Goodbye. */
}
extern "C" int
sigaction (int sig, const struct sigaction *newact, struct sigaction *oldact)
{
sig_dispatch_pending (0);
sigproc_printf ("signal %d, newact %p, oldact %p", sig, newact, oldact);
/* check that sig is in right range */
if (sig < 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = sigaction signal %d out of range", sig);
return -1;
}
struct sigaction oa = myself->getsig (sig);
if (newact)
{
if (sig == SIGKILL || sig == SIGSTOP)
{
set_errno (EINVAL);
return -1;
}
myself->getsig (sig) = *newact;
if (newact->sa_handler == SIG_IGN)
sig_clear (sig);
if (newact->sa_handler == SIG_DFL && sig == SIGCHLD)
sig_clear (sig);
set_sigcatchers (oa.sa_handler, newact->sa_handler);
}
if (oldact)
*oldact = oa;
return 0;
}
extern "C" int
sigaddset (sigset_t *set, const int sig)
{
/* check that sig is in right range */
if (sig <= 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = sigaddset signal %d out of range", sig);
return -1;
}
*set |= SIGTOMASK (sig);
return 0;
}
extern "C" int
sigdelset (sigset_t *set, const int sig)
{
/* check that sig is in right range */
if (sig <= 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = sigdelset signal %d out of range", sig);
return -1;
}
*set &= ~SIGTOMASK (sig);
return 0;
}
extern "C" int
sigismember (const sigset_t *set, int sig)
{
/* check that sig is in right range */
if (sig <= 0 || sig >= NSIG)
{
set_errno (EINVAL);
syscall_printf ("SIG_ERR = sigdelset signal %d out of range", sig);
return -1;
}
if (*set & SIGTOMASK (sig))
return 1;
else
return 0;
}
extern "C" int
sigemptyset (sigset_t *set)
{
*set = (sigset_t) 0;
return 0;
}
extern "C" int
sigfillset (sigset_t *set)
{
*set = ~((sigset_t) 0);
return 0;
}
extern "C" int
sigpending (sigset_t *set)
{
unsigned bit;
*set = 0;
for (int sig = 1; sig < NSIG; sig++)
if (*myself->getsigtodo (sig) && myself->getsigmask () & (bit = SIGTOMASK (sig)))
*set |= bit;
return 0;
}
extern "C" int
sigsuspend (const sigset_t *set)
{
return handle_sigsuspend (*set);
}
extern "C" int
sigpause (int signal_mask)
{
return handle_sigsuspend ((sigset_t) signal_mask);
}
extern "C" int
pause (void)
{
return handle_sigsuspend (myself->getsigmask ());
}
extern "C" int
siginterrupt (int sig, int flag)
{
struct sigaction act;
(void)sigaction(sig, NULL, &act);
if (flag)
act.sa_flags &= ~SA_RESTART;
else
act.sa_flags |= SA_RESTART;
return sigaction(sig, &act, NULL);
}