1 /* POSIX.1 `sigaction' call for Linux/i386.
2 Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
25 /* The difference here is that the sigaction structure used in the
26 kernel is not the same as we use in the libc. Therefore we must
28 #include <kernel_sigaction.h>
31 extern int __syscall_rt_signal (int, const struct sigaction *,
32 struct sigaction *, size_t);
34 /* The variable is shared between all wrappers around signal handling
35 functions which have RT equivalents. It is defined in sigsuspend.c. */
36 extern int __libc_have_rt_sigs;
39 /* If ACT is not NULL, change the action for SIG to *ACT.
40 If OACT is not NULL, put the old action for SIG in *OACT. */
42 __sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
44 struct old_kernel_sigaction k_newact, k_oldact;
47 /* First try the RT signals. */
48 if (__libc_have_rt_sigs)
50 struct sigaction nact;
52 nact.sa_handler = act->sa_handler;
53 memcpy (&nact.sa_mask, &act->sa_mask, sizeof (sigset_t));
54 nact.sa_flags = act->sa_flags;
56 nact.sa_restorer = ((act->sa_flags & SA_NOMASK)
57 ? &&restore_nomask : &&restore);
59 /* XXX The size argument hopefully will have to be changed to the
60 real size of the user-level sigset_t. */
61 result = __syscall_rt_sigaction (sig, &nact, oact,
62 _NSIG / (8 * sizeof (long int)));
64 if (result >= 0 || errno != ENOSYS)
67 __libc_have_rt_sigs = 0;
72 k_newact.k_sa_handler = act->sa_handler;
73 k_newact.sa_mask = act->sa_mask.__val[0];
74 k_newact.sa_flags = act->sa_flags;
76 k_newact.sa_restorer = ((act->sa_flags & SA_NOMASK)
77 ? &&restore_nomask : &&restore);
80 asm volatile ("pushl %%ebx\n"
85 : "0" (SYS_ify (sigaction)), "r" (sig),
86 "c" (act ? &k_newact : 0), "d" (oact ? &k_oldact : 0));
90 __set_errno (-result);
96 oact->sa_handler = k_oldact.k_sa_handler;
97 oact->sa_mask.__val[0] = k_oldact.sa_mask;
98 oact->sa_flags = k_oldact.sa_flags;
99 oact->sa_restorer = k_oldact.sa_restorer;
110 " addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %%ebx\n"
112 " call __sigsetmask@PLT\n"
117 " call __sigsetmask\n"
128 asm (" addl $4, %%esp\n"
140 weak_alias (__sigaction, sigaction)