glibc/sysdeps/unix/sysv/linux/i386/sigaction.c
Ulrich Drepper 655b26bb75 Update.
1998-10-29  Andreas Schwab  <schwab@issan.cs.uni-dortmund.de> 
 
	* manual/locale.texi (Formatting Numbers): Fix strfmon examples. 
 
1998-10-28  Andreas Schwab  <schwab@issan.cs.uni-dortmund.de> 
 
	* sysdeps/generic/bits/select.h (__FD_ZERO): Change '\0' to plain 
	0, __fd_mask is usually not a char. 
 
1998-10-30  Andreas Jaeger  <aj@arthur.rhein-neckar.de> 
 
	* sysdeps/unix/sysv/linux/sigpending.c (sigpending): Allow 
	compilation on systems without rt_* syscalls (e.g. on Linux 2.0). 
	* sysdeps/unix/sysv/linux/sigprocmask.c (__sigprocmask): Likewise. 
	* sysdeps/unix/sysv/linux/sigwaitinfo.c: Likewise. 
	* sysdeps/unix/sysv/linux/sigtimedwait.c: Likewise. 
	* sysdeps/unix/sysv/linux/sigsuspend.c (__sigsuspend): Likewise 
	* sysdeps/unix/sysv/linux/sigqueue.c: Likewise. 
	* sysdeps/unix/sysv/linux/aio_sigqueue.c: Likewise. 
 
	* sysdeps/unix/sysv/linux/i386/sigaction.c (__sigaction): Allow 
	compiling on systems without rt_sigaction syscall. 
	* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (__sigaction): 
	Likewise. 
 
1998-10-30  Andreas Jaeger  <aj@arthur.rhein-neckar.de> 
 
	* time/strptime.c (HERE_D_FMT): Fix typo.   
	Reported by Claus Heine <heine@math1.rwth-aachen.de>, PR libc/842. 
 
	* catgets/test1.msg: New file.
1998-10-31 11:42:52 +00:00

160 lines
4.2 KiB
C

/* POSIX.1 `sigaction' call for Linux/i386.
Copyright (C) 1991, 1995, 1996, 1997, 1998 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
#include <errno.h>
#include <stddef.h>
#include <signal.h>
#include <sysdep.h>
#include <sys/syscall.h>
/* The difference here is that the sigaction structure used in the
kernel is not the same as we use in the libc. Therefore we must
translate it here. */
#include <kernel_sigaction.h>
extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
struct kernel_sigaction *, size_t);
/* The variable is shared between all wrappers around signal handling
functions which have RT equivalents. */
int __libc_missing_rt_sigs;
/* 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 (int sig, const struct sigaction *act, struct sigaction *oact)
{
struct old_kernel_sigaction k_newact, k_oldact;
int result;
#ifdef __NR_rt_sigaction
/* First try the RT signals. */
if (!__libc_missing_rt_sigs)
{
struct kernel_sigaction kact, koact;
int saved_errno = errno;
if (act)
{
kact.k_sa_handler = act->sa_handler;
memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
kact.sa_flags = act->sa_flags;
kact.sa_restorer = ((act->sa_flags & SA_NOMASK)
? &&restore_nomask : &&restore);
}
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
result = INLINE_SYSCALL (rt_sigaction, 4, sig, act ? &kact : NULL,
oact ? &koact : NULL, _NSIG / 8);
if (result >= 0 || errno != ENOSYS)
{
if (oact && result >= 0)
{
oact->sa_handler = koact.k_sa_handler;
memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
oact->sa_flags = koact.sa_flags;
oact->sa_restorer = koact.sa_restorer;
}
return result;
}
__set_errno (saved_errno);
__libc_missing_rt_sigs = 1;
}
#endif
if (act)
{
k_newact.k_sa_handler = act->sa_handler;
k_newact.sa_mask = act->sa_mask.__val[0];
k_newact.sa_flags = act->sa_flags;
k_newact.sa_restorer = ((act->sa_flags & SA_NOMASK)
? &&restore_nomask : &&restore);
}
asm volatile ("pushl %%ebx\n"
"movl %2, %%ebx\n"
"int $0x80\n"
"popl %%ebx"
: "=a" (result)
: "0" (SYS_ify (sigaction)), "r" (sig),
"c" (act ? &k_newact : 0), "d" (oact ? &k_oldact : 0));
if (result < 0)
{
__set_errno (-result);
return -1;
}
if (oact)
{
oact->sa_handler = k_oldact.k_sa_handler;
oact->sa_mask.__val[0] = k_oldact.sa_mask;
oact->sa_flags = k_oldact.sa_flags;
oact->sa_restorer = k_oldact.sa_restorer;
}
return 0;
restore:
asm (
#ifdef PIC
" pushl %%ebx\n"
" call 0f\n"
"0: popl %%ebx\n"
" addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %%ebx\n"
" addl $8, %%esp\n"
" call __sigsetmask@PLT\n"
" addl $8, %%esp\n"
" popl %%ebx\n"
#else
" addl $4, %%esp\n"
" call __sigsetmask\n"
" addl $4, %%esp\n"
#endif
" popl %%eax\n"
" popl %%ecx\n"
" popl %%edx\n"
" popf\n"
" ret"
: : );
restore_nomask:
asm (" addl $4, %%esp\n"
" popl %%eax\n"
" popl %%ecx\n"
" popl %%edx\n"
" popf\n"
" ret"
: : );
/* NOTREACHED */
return -1;
}
weak_alias (__sigaction, sigaction)