mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* Copyright (C) 1994, 1995 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stddef.h>
|
|
|
|
static __sighandler_t user_handlers[NSIG];
|
|
|
|
extern int __context_syscall (int, struct sigcontext *);
|
|
extern int __sigaction_syscall (int,
|
|
const struct sigaction *, struct sigaction *);
|
|
|
|
static void
|
|
trampoline (int sig, int code, struct sigcontext *context)
|
|
{
|
|
(*(void (*) (int, int, struct sigcontext *)) user_handlers[sig])
|
|
(sig, code, context);
|
|
__context_syscall (1, context);
|
|
}
|
|
|
|
/* If ACT is not NULL, change the action for SIG to *ACT.
|
|
If OACT is not NULL, put the old action for SIG in *OACT. */
|
|
int
|
|
DEFUN(__sigaction, (sig, act, oact),
|
|
int sig AND CONST struct sigaction *act AND struct sigaction *oact)
|
|
{
|
|
struct sigaction myact;
|
|
__sighandler_t ohandler;
|
|
|
|
if (sig <= 0 || sig >= NSIG)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
ohandler = user_handlers[sig];
|
|
|
|
if (act != NULL)
|
|
{
|
|
user_handlers[sig] = act->sa_handler;
|
|
if (act->sa_handler != SIG_DFL && act->sa_handler != SIG_IGN)
|
|
{
|
|
myact = *act;
|
|
act = &myact;
|
|
act->sa_handler = (__sighandler_t) trampoline;
|
|
}
|
|
}
|
|
|
|
if (__sigaction_syscall (sig, act, oact) < 0)
|
|
{
|
|
/* The syscall got an error. Restore the old handler and return -1. */
|
|
user_handlers[sig] = ohandler;
|
|
return -1;
|
|
}
|
|
|
|
if (oact != NULL && oact->sa_handler == (__sighandler_t) trampoline)
|
|
oact->sa_handler = ohandler;
|
|
|
|
return 0;
|
|
}
|
|
|
|
weak_alias (__sigaction, sigaction)
|