621 lines
14 KiB
C++
621 lines
14 KiB
C++
/* signal.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.
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Written by Steve Chamberlain of Cygnus Support, sac@cygnus.com
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Significant changes by Sergey Okhapkin <sos@prospect.com.ru>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <sys/cygwin.h>
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#include "pinfo.h"
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#include "sigproc.h"
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#include "cygtls.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "cygwait.h"
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#define _SA_NORESTART 0x8000
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static int __reg3 sigaction_worker (int, const struct sigaction *, struct sigaction *, bool);
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#define sigtrapped(func) ((func) != SIG_IGN && (func) != SIG_DFL)
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extern "C" _sig_func_ptr
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signal (int sig, _sig_func_ptr func)
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{
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sig_dispatch_pending ();
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_sig_func_ptr prev;
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/* check that sig is in right range */
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if (sig < 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP)
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{
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set_errno (EINVAL);
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syscall_printf ("SIG_ERR = signal (%d, %p)", sig, func);
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return (_sig_func_ptr) SIG_ERR;
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}
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prev = global_sigs[sig].sa_handler;
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struct sigaction& gs = global_sigs[sig];
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if (gs.sa_flags & _SA_NORESTART)
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gs.sa_flags &= ~SA_RESTART;
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else
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gs.sa_flags |= SA_RESTART;
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gs.sa_mask = SIGTOMASK (sig);
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gs.sa_handler = func;
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gs.sa_flags &= ~SA_SIGINFO;
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syscall_printf ("%p = signal (%d, %p)", prev, sig, func);
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return prev;
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}
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extern "C" int
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clock_nanosleep (clockid_t clk_id, int flags, const struct timespec *rqtp,
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struct timespec *rmtp)
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{
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const bool abstime = (flags & TIMER_ABSTIME) ? true : false;
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int res = 0;
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sig_dispatch_pending ();
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pthread_testcancel ();
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if (rqtp->tv_sec < 0 || rqtp->tv_nsec < 0 || rqtp->tv_nsec > 999999999L)
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return EINVAL;
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/* Explicitly disallowed by POSIX. Needs to be checked first to avoid
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being caught by the following test. */
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if (clk_id == CLOCK_THREAD_CPUTIME_ID)
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return EINVAL;
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/* support for CPU-time clocks is optional */
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if (CLOCKID_IS_PROCESS (clk_id) || CLOCKID_IS_THREAD (clk_id))
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return ENOTSUP;
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switch (clk_id)
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{
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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break;
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default:
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/* unknown or illegal clock ID */
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return EINVAL;
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}
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LARGE_INTEGER timeout;
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timeout.QuadPart = (LONGLONG) rqtp->tv_sec * NSPERSEC
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+ ((LONGLONG) rqtp->tv_nsec + 99LL) / 100LL;
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if (abstime)
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{
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struct timespec tp;
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clock_gettime (clk_id, &tp);
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/* Check for immediate timeout */
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if (tp.tv_sec > rqtp->tv_sec
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|| (tp.tv_sec == rqtp->tv_sec && tp.tv_nsec > rqtp->tv_nsec))
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return 0;
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if (clk_id == CLOCK_REALTIME)
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timeout.QuadPart += FACTOR;
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else
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{
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/* other clocks need to be handled with a relative timeout */
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timeout.QuadPart -= tp.tv_sec * NSPERSEC + tp.tv_nsec / 100LL;
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timeout.QuadPart *= -1LL;
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}
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}
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else /* !abstime */
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timeout.QuadPart *= -1LL;
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syscall_printf ("clock_nanosleep (%ld.%09ld)", rqtp->tv_sec, rqtp->tv_nsec);
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int rc = cygwait (NULL, &timeout, cw_sig_eintr | cw_cancel | cw_cancel_self);
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if (rc == WAIT_SIGNALED)
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res = EINTR;
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/* according to POSIX, rmtp is used only if !abstime */
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if (rmtp && !abstime)
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{
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rmtp->tv_sec = (time_t) (timeout.QuadPart / NSPERSEC);
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rmtp->tv_nsec = (long) ((timeout.QuadPart % NSPERSEC) * 100LL);
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}
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syscall_printf ("%d = clock_nanosleep(%lu, %d, %ld.%09ld, %ld.%09.ld)",
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res, clk_id, flags, rqtp->tv_sec, rqtp->tv_nsec,
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rmtp ? rmtp->tv_sec : 0, rmtp ? rmtp->tv_nsec : 0);
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return res;
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}
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extern "C" int
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nanosleep (const struct timespec *rqtp, struct timespec *rmtp)
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{
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int res = clock_nanosleep (CLOCK_REALTIME, 0, rqtp, rmtp);
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if (res != 0)
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{
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set_errno (res);
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return -1;
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}
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return 0;
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}
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extern "C" unsigned int
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sleep (unsigned int seconds)
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{
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struct timespec req, rem;
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req.tv_sec = seconds;
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req.tv_nsec = 0;
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if (clock_nanosleep (CLOCK_REALTIME, 0, &req, &rem))
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return rem.tv_sec + (rem.tv_nsec > 0);
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return 0;
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}
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extern "C" unsigned int
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usleep (useconds_t useconds)
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{
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struct timespec req;
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req.tv_sec = useconds / 1000000;
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req.tv_nsec = (useconds % 1000000) * 1000;
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int res = clock_nanosleep (CLOCK_REALTIME, 0, &req, NULL);
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if (res != 0)
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{
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set_errno (res);
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return -1;
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}
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return 0;
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}
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extern "C" int
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sigprocmask (int how, const sigset_t *set, sigset_t *oldset)
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{
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int res = handle_sigprocmask (how, set, oldset, _my_tls.sigmask);
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if (res)
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{
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set_errno (res);
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res = -1;
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}
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syscall_printf ("%R = sigprocmask (%d, %p, %p)", res, how, set, oldset);
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return res;
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}
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int __reg3
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handle_sigprocmask (int how, const sigset_t *set, sigset_t *oldset, sigset_t& opmask)
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{
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/* check that how is in right range */
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if (how != SIG_BLOCK && how != SIG_UNBLOCK && how != SIG_SETMASK)
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{
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syscall_printf ("Invalid how value %d", how);
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return EINVAL;
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}
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myfault efault;
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if (efault.faulted (EFAULT))
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return EFAULT;
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if (oldset)
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*oldset = opmask;
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if (set)
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{
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sigset_t newmask = opmask;
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switch (how)
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{
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case SIG_BLOCK:
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/* add set to current mask */
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newmask |= *set;
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break;
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case SIG_UNBLOCK:
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/* remove set from current mask */
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newmask &= ~*set;
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break;
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case SIG_SETMASK:
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/* just set it */
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newmask = *set;
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break;
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}
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set_signal_mask (opmask, newmask);
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}
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return 0;
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}
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int __reg2
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_pinfo::kill (siginfo_t& si)
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{
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int res;
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DWORD this_process_state;
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pid_t this_pid;
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sig_dispatch_pending ();
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if (exists ())
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{
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bool sendSIGCONT;
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this_process_state = process_state;
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if ((sendSIGCONT = (si.si_signo < 0)))
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si.si_signo = -si.si_signo;
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if (si.si_signo == 0)
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res = 0;
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else if ((res = sig_send (this, si)))
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{
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sigproc_printf ("%d = sig_send, %E ", res);
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res = -1;
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}
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else if (sendSIGCONT)
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{
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siginfo_t si2 = {0};
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si2.si_signo = SIGCONT;
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si2.si_code = SI_KERNEL;
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sig_send (this, si2);
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}
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this_pid = pid;
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}
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else if (si.si_signo == 0 && this && process_state == PID_EXITED)
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{
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this_process_state = process_state;
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this_pid = pid;
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res = 0;
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}
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else
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{
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set_errno (ESRCH);
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this_process_state = 0;
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this_pid = 0;
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res = -1;
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}
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syscall_printf ("%d = _pinfo::kill (%d), pid %d, process_state %y", res,
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si.si_signo, this_pid, this_process_state);
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return res;
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}
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int
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raise (int sig)
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{
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return kill (myself->pid, sig);
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}
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static int
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kill0 (pid_t pid, siginfo_t& si)
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{
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syscall_printf ("kill (%d, %d)", pid, si.si_signo);
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/* check that sig is in right range */
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if (si.si_signo < 0 || si.si_signo >= NSIG)
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{
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set_errno (EINVAL);
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syscall_printf ("signal %d out of range", si.si_signo);
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return -1;
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}
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return (pid > 0) ? pinfo (pid)->kill (si) : kill_pgrp (-pid, si);
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}
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int
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kill (pid_t pid, int sig)
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{
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siginfo_t si = {0};
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si.si_signo = sig;
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si.si_code = SI_USER;
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return kill0 (pid, si);
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}
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int
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kill_pgrp (pid_t pid, siginfo_t& si)
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{
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int res = 0;
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int found = 0;
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int killself = 0;
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sigproc_printf ("pid %d, signal %d", pid, si.si_signo);
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winpids pids ((DWORD) PID_MAP_RW);
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for (unsigned i = 0; i < pids.npids; i++)
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{
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_pinfo *p = pids[i];
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if (!p->exists ())
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continue;
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/* Is it a process we want to kill? */
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if ((pid == 0 && (p->pgid != myself->pgid || p->ctty != myself->ctty)) ||
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(pid > 1 && p->pgid != pid) ||
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(si.si_signo < 0 && NOTSTATE (p, PID_STOPPED)))
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continue;
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sigproc_printf ("killing pid %d, pgrp %d, p->%s, %s", p->pid, p->pgid,
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p->__ctty (), myctty ());
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if (p == myself)
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killself++;
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else if (p->kill (si))
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res = -1;
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found++;
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}
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if (killself && !exit_state && myself->kill (si))
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res = -1;
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if (!found)
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{
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set_errno (ESRCH);
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res = -1;
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}
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syscall_printf ("%R = kill(%d, %d)", res, pid, si.si_signo);
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return res;
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}
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extern "C" int
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killpg (pid_t pgrp, int sig)
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{
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return kill (-pgrp, sig);
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}
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extern "C" void
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abort (void)
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{
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_my_tls.incyg++;
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sig_dispatch_pending ();
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/* Ensure that SIGABRT can be caught regardless of blockage. */
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sigset_t sig_mask;
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sigfillset (&sig_mask);
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sigdelset (&sig_mask, SIGABRT);
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set_signal_mask (_my_tls.sigmask, sig_mask);
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raise (SIGABRT);
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_my_tls.call_signal_handler (); /* Call any signal handler */
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/* Flush all streams as per SUSv2. */
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if (_GLOBAL_REENT->__cleanup)
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_GLOBAL_REENT->__cleanup (_GLOBAL_REENT);
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do_exit (SIGABRT); /* signal handler didn't exit. Goodbye. */
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}
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static int __reg3
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sigaction_worker (int sig, const struct sigaction *newact,
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struct sigaction *oldact, bool isinternal)
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{
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int res = -1;
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myfault efault;
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if (!efault.faulted (EFAULT))
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{
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sig_dispatch_pending ();
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/* check that sig is in right range */
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if (sig < 0 || sig >= NSIG)
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set_errno (EINVAL);
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else
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{
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struct sigaction oa = global_sigs[sig];
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if (!newact)
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sigproc_printf ("signal %d, newact %p, oa %p", sig, newact, oa, oa.sa_handler);
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else
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{
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sigproc_printf ("signal %d, newact %p (handler %p), oa %p", sig, newact, newact->sa_handler, oa, oa.sa_handler);
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if (sig == SIGKILL || sig == SIGSTOP)
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{
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set_errno (EINVAL);
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goto out;
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}
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struct sigaction na = *newact;
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struct sigaction& gs = global_sigs[sig];
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if (!isinternal)
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na.sa_flags &= ~_SA_INTERNAL_MASK;
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gs = na;
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if (!(gs.sa_flags & SA_NODEFER))
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gs.sa_mask |= SIGTOMASK(sig);
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if (gs.sa_handler == SIG_IGN)
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sig_clear (sig);
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if (gs.sa_handler == SIG_DFL && sig == SIGCHLD)
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sig_clear (sig);
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if (sig == SIGCHLD)
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{
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myself->process_state &= ~PID_NOCLDSTOP;
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if (gs.sa_flags & SA_NOCLDSTOP)
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myself->process_state |= PID_NOCLDSTOP;
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}
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}
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if (oldact)
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{
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*oldact = oa;
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oa.sa_flags &= ~_SA_INTERNAL_MASK;
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}
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res = 0;
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}
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}
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out:
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return res;
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}
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extern "C" int
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sigaction (int sig, const struct sigaction *newact, struct sigaction *oldact)
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{
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int res = sigaction_worker (sig, newact, oldact, false);
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syscall_printf ("%R = sigaction(%d, %p, %p)", res, sig, newact, oldact);
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return res;
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}
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extern "C" int
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sigaddset (sigset_t *set, const int sig)
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{
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/* check that sig is in right range */
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if (sig <= 0 || sig >= NSIG)
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{
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set_errno (EINVAL);
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syscall_printf ("SIG_ERR = sigaddset signal %d out of range", sig);
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return -1;
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}
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*set |= SIGTOMASK (sig);
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return 0;
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}
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extern "C" int
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sigdelset (sigset_t *set, const int sig)
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{
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/* check that sig is in right range */
|
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if (sig <= 0 || sig >= NSIG)
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{
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set_errno (EINVAL);
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syscall_printf ("SIG_ERR = sigdelset signal %d out of range", sig);
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return -1;
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}
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|
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*set &= ~SIGTOMASK (sig);
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return 0;
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}
|
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|
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extern "C" int
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sigismember (const sigset_t *set, int sig)
|
|
{
|
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/* check that sig is in right range */
|
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if (sig <= 0 || sig >= NSIG)
|
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{
|
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set_errno (EINVAL);
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syscall_printf ("SIG_ERR = sigdelset signal %d out of range", sig);
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return -1;
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}
|
|
|
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if (*set & SIGTOMASK (sig))
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return 1;
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else
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return 0;
|
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}
|
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|
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extern "C" int
|
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sigemptyset (sigset_t *set)
|
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{
|
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*set = (sigset_t) 0;
|
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return 0;
|
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}
|
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|
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extern "C" int
|
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sigfillset (sigset_t *set)
|
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{
|
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*set = ~((sigset_t) 0);
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return 0;
|
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}
|
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|
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extern "C" int
|
|
sigsuspend (const sigset_t *set)
|
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{
|
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int res = handle_sigsuspend (*set);
|
|
syscall_printf ("%R = sigsuspend(%p)", res, set);
|
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return res;
|
|
}
|
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|
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extern "C" int
|
|
sigpause (int signal_mask)
|
|
{
|
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int res = handle_sigsuspend ((sigset_t) signal_mask);
|
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syscall_printf ("%R = sigpause(%y)", res, signal_mask);
|
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return res;
|
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}
|
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|
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extern "C" int
|
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pause (void)
|
|
{
|
|
int res = handle_sigsuspend (_my_tls.sigmask);
|
|
syscall_printf ("%R = pause()", res);
|
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return res;
|
|
}
|
|
|
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extern "C" int
|
|
siginterrupt (int sig, int flag)
|
|
{
|
|
struct sigaction act;
|
|
sigaction (sig, NULL, &act);
|
|
if (flag)
|
|
{
|
|
act.sa_flags &= ~SA_RESTART;
|
|
act.sa_flags |= _SA_NORESTART;
|
|
}
|
|
else
|
|
{
|
|
act.sa_flags &= ~_SA_NORESTART;
|
|
act.sa_flags |= SA_RESTART;
|
|
}
|
|
int res = sigaction_worker (sig, &act, NULL, true);
|
|
syscall_printf ("%R = siginterrupt(%d, %y)", sig, flag);
|
|
return res;
|
|
}
|
|
|
|
extern "C" int
|
|
sigwait (const sigset_t *set, int *sig_ptr)
|
|
{
|
|
int sig = sigwaitinfo (set, NULL);
|
|
if (sig > 0)
|
|
*sig_ptr = sig;
|
|
return sig > 0 ? 0 : -1;
|
|
}
|
|
|
|
extern "C" int
|
|
sigwaitinfo (const sigset_t *set, siginfo_t *info)
|
|
{
|
|
pthread_testcancel ();
|
|
|
|
myfault efault;
|
|
if (efault.faulted (EFAULT))
|
|
return -1;
|
|
|
|
set_signal_mask (_my_tls.sigwait_mask, *set);
|
|
sig_dispatch_pending (true);
|
|
|
|
int res;
|
|
switch (cygwait (NULL, cw_infinite, cw_sig_eintr | cw_cancel | cw_cancel_self))
|
|
{
|
|
case WAIT_SIGNALED:
|
|
if (!sigismember (set, _my_tls.infodata.si_signo))
|
|
{
|
|
set_errno (EINTR);
|
|
res = -1;
|
|
}
|
|
else
|
|
{
|
|
_my_tls.lock ();
|
|
if (info)
|
|
*info = _my_tls.infodata;
|
|
res = _my_tls.infodata.si_signo;
|
|
_my_tls.sig = 0;
|
|
if (_my_tls.retaddr () == (__stack_t) sigdelayed)
|
|
_my_tls.pop ();
|
|
_my_tls.unlock ();
|
|
}
|
|
break;
|
|
default:
|
|
__seterrno ();
|
|
res = -1;
|
|
}
|
|
|
|
sigproc_printf ("returning signal %d", res);
|
|
return res;
|
|
}
|
|
|
|
/* FIXME: SUSv3 says that this function should block until the signal has
|
|
actually been delivered. Currently, this will only happen when sending
|
|
signals to the current process. It will not happen when sending signals
|
|
to other processes. */
|
|
extern "C" int
|
|
sigqueue (pid_t pid, int sig, const union sigval value)
|
|
{
|
|
siginfo_t si = {0};
|
|
pinfo dest (pid);
|
|
if (!dest)
|
|
{
|
|
set_errno (ESRCH);
|
|
return -1;
|
|
}
|
|
si.si_signo = sig;
|
|
si.si_code = SI_QUEUE;
|
|
si.si_value = value;
|
|
return sig_send (dest, si);
|
|
}
|