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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
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/* Copyright (C) 1991, 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 <errno.h>
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#include <signal.h>
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sigset_t _sigintr; /* Set by siginterrupt. */
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/* Set the handler for the signal SIG to HANDLER,
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returning the old handler, or SIG_ERR on error. */
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__sighandler_t
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DEFUN(signal, (sig, handler), int sig AND __sighandler_t handler)
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{
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struct sigaction act, oact;
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if (handler == SIG_ERR)
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{
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errno = EINVAL;
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return SIG_ERR;
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}
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act.sa_handler = handler;
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if (__sigemptyset (&act.sa_mask) < 0)
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return SIG_ERR;
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act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;
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if (__sigaction (sig, &act, &oact) < 0)
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return SIG_ERR;
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return oact.sa_handler;
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}
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