59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/* Copyright (C) 1991, 1992, 1996, 1997 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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <signal.h>
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/* Tolerate non-threads versions of Posix */
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#ifndef SA_ONESHOT
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#define SA_ONESHOT 0
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#endif
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#ifndef SA_NOMASK
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#define SA_NOMASK 0
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#endif
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#ifndef SA_INTERRUPT
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#define SA_INTERRUPT 0
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#endif
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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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__sysv_signal (sig, handler)
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int sig;
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__sighandler_t handler;
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{
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struct sigaction act, oact;
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/* Check signal extents to protect __sigismember. */
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if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
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{
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__set_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 = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT;
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act.sa_flags &= ~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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