/* POSIX.1 `sigaction' call for Linux/i386.
-Copyright (C) 1991, 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+ Copyright (C) 1991, 1995, 1996, 1997 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 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.
+ 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. */
+ 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>
+/* 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_signal (int, const struct sigaction *,
+ struct sigaction *, size_t);
+
+/* The variable is shared between all wrappers around signal handling
+ functions which have RT equivalents. It is defined in sigsuspend.c. */
+extern int __libc_have_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 sigaction newact;
+ struct old_kernel_sigaction k_newact, k_oldact;
int result;
- if (new)
+ /* First try the RT signals. */
+ if (__libc_have_rt_sigs)
{
- newact = *new;
- new = &newact;
- new->sa_restorer = ((new->sa_flags & SA_NOMASK)
+ struct sigaction nact;
+
+ nact.sa_handler = act->sa_handler;
+ memcpy (&nact.sa_mask, &act->sa_mask, sizeof (sigset_t));
+ nact.sa_flags = act->sa_flags;
+
+ nact.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 = __syscall_rt_sigaction (sig, &nact, oact,
+ _NSIG / (8 * sizeof (long int)));
+
+ if (result >= 0 || errno != ENOSYS)
+ return result;
+
+ __libc_have_rt_sigs = 0;
+ }
+
+ 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 %1, %%ebx\n"
+ "movl %2, %%ebx\n"
"int $0x80\n"
"popl %%ebx"
: "=a" (result)
- : "0" (SYS_ify (sigaction)), "g" (sig), "c" (new), "d" (old));
+ : "0" (SYS_ify (sigaction)), "r" (sig),
+ "c" (act ? &k_newact : 0), "d" (oact ? &k_oldact : 0));
if (result < 0)
{
- errno = -result;
+ __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"
+ " pushl %%ebx\n"
" call 0f\n"
- "0: popl %ebx\n"
- " addl $_GLOBAL_OFFSET_TABLE_+[.-0b],%ebx\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"
+ " 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");
+ " 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");
+ asm (" addl $4, %%esp\n"
+ " popl %%eax\n"
+ " popl %%ecx\n"
+ " popl %%edx\n"
+ " popf\n"
+ " ret"
+ : : );
+
+ /* NOTREACHED */
+ return -1;
}
weak_alias (__sigaction, sigaction)
projects / platform / upstream / linaro-glibc.git / blobdiff