| 1 | /* BSD-like signal function. |
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| 2 | Copyright (C) 1991, 1992, 1996, 1997, 2000 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, write to the Free |
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| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 18 | 02111-1307 USA. */ |
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| 19 | |
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| 20 | #include <errno.h> |
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| 21 | #include <signal.h> |
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| 22 | #include <machine/weakalias.h> |
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| 23 | |
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| 24 | sigset_t _sigintr; /* Set by siginterrupt. */ |
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| 25 | |
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| 26 | /* Set the handler for the signal SIG to HANDLER, |
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| 27 | returning the old handler, or SIG_ERR on error. */ |
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| 28 | __sighandler_t |
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| 29 | __bsd_signal (sig, handler) |
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| 30 | int sig; |
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| 31 | __sighandler_t handler; |
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| 32 | { |
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| 33 | struct sigaction act, oact; |
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| 34 | |
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| 35 | /* Check signal extents to protect __sigismember. */ |
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| 36 | if (handler == SIG_ERR || sig < 1 || sig >= NSIG) |
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| 37 | { |
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| 38 | errno = (EINVAL); |
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| 39 | return SIG_ERR; |
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| 40 | } |
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| 41 | |
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| 42 | act.sa_handler = handler; |
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| 43 | if (sigemptyset (&act.sa_mask) < 0 |
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| 44 | || sigaddset (&act.sa_mask, sig) < 0) |
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| 45 | return SIG_ERR; |
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| 46 | act.sa_flags = sigismember (&_sigintr, sig) ? 0 : SA_RESTART; |
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| 47 | if (sigaction (sig, &act, &oact) < 0) |
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| 48 | return SIG_ERR; |
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| 49 | |
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| 50 | return oact.sa_handler; |
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| 51 | } |
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| 52 | weak_alias (__bsd_signal, bsd_signal) |
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| 53 | weak_alias (__bsd_signal, signal) |
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| 54 | weak_alias (__bsd_signal, ssignal) |
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