mirror of git://sourceware.org/git/glibc.git
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* Copyright (C) 1992,1994,1995,1996,1997,2002 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <signal.h>
|
|
|
|
|
|
/* 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
|
|
__sigaction (sig, act, oact)
|
|
int sig;
|
|
const struct sigaction *act;
|
|
struct sigaction *oact;
|
|
{
|
|
sighandler_t handler;
|
|
int save;
|
|
|
|
if (sig <= 0 || sig >= NSIG)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
if (act == NULL)
|
|
{
|
|
if (oact == NULL)
|
|
return 0;
|
|
/* Race condition, but this is the only way to do it. */
|
|
handler = signal (sig, SIG_IGN);
|
|
if (handler == SIG_ERR)
|
|
return -1;
|
|
save = errno;
|
|
(void) signal (sig, handler);
|
|
__set_errno (save);
|
|
}
|
|
else
|
|
{
|
|
int i;
|
|
|
|
if (act->sa_flags != 0)
|
|
{
|
|
unimplemented:
|
|
__set_errno (ENOSYS);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 1; i < NSIG; ++i)
|
|
if (__sigismember (&act->sa_mask, i))
|
|
goto unimplemented;
|
|
|
|
handler = signal (sig, act->sa_handler);
|
|
if (handler == SIG_ERR)
|
|
return -1;
|
|
}
|
|
|
|
if (oact != NULL)
|
|
{
|
|
oact->sa_handler = handler;
|
|
__sigemptyset (&oact->sa_mask);
|
|
oact->sa_flags = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
libc_hidden_def (__sigaction)
|
|
weak_alias (__sigaction, sigaction)
|