1 /* Copyright (C) 1997 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
21 /* The difference here is that the sigaction structure used in the
22 kernel is not the same as we use in the libc. Therefore we must
24 #include <kernel_sigaction.h>
26 extern int __syscall_sigaction (int, const struct kernel_sigaction *,
27 struct kernel_sigaction *);
28 extern int __syscall_rt_signal (int, const struct sigaction *,
29 struct sigaction *, size_t);
31 /* The variable is shared between all wrappers around signal handling
32 functions which have RT equivalents. It is defined in sigsuspend.c. */
33 extern int __libc_have_rt_sigs;
36 /* If ACT is not NULL, change the action for SIG to *ACT.
37 If OACT is not NULL, put the old action for SIG in *OACT. */
39 __sigaction (sig, act, oact)
41 const struct sigaction *act;
42 struct sigaction *oact;
44 struct old_kernel_sigaction k_sigact, k_osigact;
47 /* First try the RT signals. */
48 if (__libc_have_rt_sigs)
50 /* XXX The size argument hopefully will have to be changed to the
51 real size of the user-level sigset_t. */
52 int result = __syscall_rt_sigaction (sig, act, oact,
53 _NSIG / (8 * sizeof (long int)));
55 if (result >= 0 || errno != ENOSYS)
58 __libc_have_rt_sigs = 0;
63 k_sigact.k_sa_handler = act->sa_handler;
64 k_sigact.sa_mask = act->sa_mask.__val[0];
65 k_sigact.sa_flags = act->sa_flags;
66 #ifdef HAVE_SA_RESTORER
67 k_sigact.sa_restorer = act->sa_restorer;
70 error = __syscall_sigaction (sig, act ? &k_sigact : 0,
71 oact ? &k_osigact : 0);
72 if (oact && error >= 0)
74 oact->sa_handler = k_osigact.k_sa_handler;
75 oact->sa_mask.__val[0] = k_osigact.sa_mask;
76 oact->sa_flags = k_osigact.sa_flags;
77 #ifdef HAVE_SA_RESTORER
78 oact->sa_restorer = k_osigact.sa_restorer;
84 weak_alias (__sigaction, sigaction)