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4d02a5b18a
* hurd/hurdsig.c (_hurd_internal_post_signal): For SIGNO==0 pending check, deliver a pending blocked signal if its action might be to ignore. * sysdeps/mach/hurd/sigaction.c: If new action is SIG_IGN or SIG_DFL and SIG is pending, wake up signal thread to check us. * hurd/hurdsig.c (_hurd_internal_post_signal): Don't mark a signal pending while blocked or stopped when the action is to ignore it. * hurd/hurdsig.c (_hurd_internal_post_signal: resume): Only set SS_SUSPENDED when the thread is really suspended. * elf/rtld.c (dl_main): Don't dereference _dl_rtld_map.l_next if null.
94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <signal.h>
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#include <hurd.h>
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#include <hurd/signal.h>
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/* If ACT is not NULL, change the action for SIG to *ACT.
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If OACT is not NULL, put the old action for SIG in *OACT. */
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int
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DEFUN(__sigaction, (sig, act, oact),
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int sig AND CONST struct sigaction *act AND struct sigaction *oact)
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{
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struct hurd_sigstate *ss;
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struct sigaction a, old;
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sigset_t pending;
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if (sig <= 0 || sig >= NSIG ||
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(act != NULL && act->sa_handler != SIG_DFL &&
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((__sigmask (sig) & _SIG_CANT_MASK) ||
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act->sa_handler == SIG_ERR)))
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{
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errno = EINVAL;
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return -1;
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}
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/* Copy so we fault before taking locks. */
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if (act != NULL)
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a = *act;
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ss = _hurd_self_sigstate ();
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__spin_lock (&ss->critical_section_lock);
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__spin_lock (&ss->lock);
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old = ss->actions[sig];
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if (act != NULL)
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ss->actions[sig] = a;
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if (act != NULL && sig == SIGCHLD &&
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(a.sa_flags & SA_NOCLDSTOP) != (old.sa_flags & SA_NOCLDSTOP))
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{
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__spin_unlock (&ss->lock);
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/* Inform the proc server whether or not it should send us SIGCHLD for
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stopped children. We do this in a critical section so that no
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SIGCHLD can arrive in the middle and be of indeterminate status. */
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__USEPORT (PROC,
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__proc_mod_stopchild (port, !(a.sa_flags & SA_NOCLDSTOP)));
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__spin_lock (&ss->lock);
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pending = ss->pending & ~ss->blocked;
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}
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else if (a.sa_handler == SIG_IGN || a.sa_handler == SIG_DFL)
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/* We are changing to an action that might be to ignore SIG signals.
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If SIG is blocked and pending and the new action is to ignore it, we
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must remove it from the pending set now; if the action is changed
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back and then SIG is unblocked, the signal pending now should not
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arrive. So wake up the signal thread to check the new state and do
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the right thing. */
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pending = ss->pending & __sigmask (sig);
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else
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pending = 0;
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__spin_unlock (&ss->lock);
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__spin_unlock (&ss->critical_section_lock);
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if (pending)
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__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
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if (oact != NULL)
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*oact = old;
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return 0;
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}
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weak_alias (__sigaction, sigaction)
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