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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* Copyright (C) 1992,1994,1995,1996,1997,2002 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <errno.h>
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#include <stddef.h>
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#include <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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__sigaction (sig, act, oact)
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int sig;
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const struct sigaction *act;
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struct sigaction *oact;
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{
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sighandler_t handler;
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int save;
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if (sig <= 0 || sig >= NSIG)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (act == NULL)
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{
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if (oact == NULL)
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return 0;
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/* Race condition, but this is the only way to do it. */
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handler = signal (sig, SIG_IGN);
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if (handler == SIG_ERR)
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return -1;
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save = errno;
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(void) signal (sig, handler);
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__set_errno (save);
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}
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else
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{
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int i;
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if (act->sa_flags != 0)
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{
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unimplemented:
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__set_errno (ENOSYS);
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return -1;
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}
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for (i = 1; i < NSIG; ++i)
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if (__sigismember (&act->sa_mask, i))
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goto unimplemented;
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handler = signal (sig, act->sa_handler);
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if (handler == SIG_ERR)
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return -1;
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}
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if (oact != NULL)
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{
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oact->sa_handler = handler;
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__sigemptyset (&oact->sa_mask);
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oact->sa_flags = 0;
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}
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return 0;
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}
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libc_hidden_def (__sigaction)
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weak_alias (__sigaction, sigaction)
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