1 /* Copyright (C) 1994,1995,1996,1997,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 static __sighandler_t user_handlers[NSIG];
25 extern int __context_syscall (int, struct sigcontext *);
26 extern int __sigaction_syscall (int,
27 const struct sigaction *, struct sigaction *);
30 trampoline (int sig, int code, struct sigcontext *context)
32 (*(void (*) (int, int, struct sigcontext *)) user_handlers[sig])
34 __context_syscall (1, context);
37 /* If ACT is not NULL, change the action for SIG to *ACT.
38 If OACT is not NULL, put the old action for SIG in *OACT. */
40 __sigaction (sig, act, oact)
42 const struct sigaction *act;
43 struct sigaction *oact;
45 struct sigaction myact;
46 __sighandler_t ohandler;
48 if (sig <= 0 || sig >= NSIG)
54 ohandler = user_handlers[sig];
58 user_handlers[sig] = act->sa_handler;
59 if (act->sa_handler != SIG_DFL && act->sa_handler != SIG_IGN)
63 act->sa_handler = (__sighandler_t) trampoline;
67 if (__sigaction_syscall (sig, act, oact) < 0)
69 /* The syscall got an error. Restore the old handler and return -1. */
70 user_handlers[sig] = ohandler;
74 if (oact != NULL && oact->sa_handler == (__sighandler_t) trampoline)
75 oact->sa_handler = ohandler;
79 libc_hidden_def (__sigaction)
80 weak_alias (__sigaction, sigaction)