75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Copyright (C) 1992 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 <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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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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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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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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errno = save;
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}
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else
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{
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if (act->sa_flags != 0 || act->sa_mask != 0)
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{
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errno = ENOSYS;
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return -1;
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}
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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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oact->sa_mask = 0;
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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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