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90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/* Copyright (C) 1991-2023 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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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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__libc_sigaction (int sig, const struct sigaction *act,
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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 (act != NULL && act->sa_handler != SIG_DFL
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&& ((__sigmask (sig) & _SIG_CANT_MASK) || 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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_hurd_sigstate_lock (ss);
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old = _hurd_sigstate_actions (ss) [sig];
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if (act != NULL)
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_hurd_sigstate_actions (ss) [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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_hurd_sigstate_unlock (ss);
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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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_hurd_sigstate_lock (ss);
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pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
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}
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else if (act != NULL && (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 = _hurd_sigstate_pending (ss) & __sigmask (sig);
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else
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pending = 0;
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_hurd_sigstate_unlock (ss);
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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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libc_hidden_def (__libc_sigaction)
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