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authorEric Andersen <andersen@codepoet.org>2004-07-17 09:36:08 +0000
committerEric Andersen <andersen@codepoet.org>2004-07-17 09:36:08 +0000
commite9064df4b3097357c89a7eb43ee0a5acc012c011 (patch)
tree630b0fc6e047a2c636ecd7f3354d21637305cdae /libc/sysdeps/linux/arm
parent22f542111603b47b8a70f8c8189dbf0d5bd8f1b2 (diff)
Update sigaction for arm
Diffstat (limited to 'libc/sysdeps/linux/arm')
-rw-r--r--libc/sysdeps/linux/arm/sigaction.c64
1 files changed, 42 insertions, 22 deletions
diff --git a/libc/sysdeps/linux/arm/sigaction.c b/libc/sysdeps/linux/arm/sigaction.c
index 549d8a0c6..5fbb7fbf1 100644
--- a/libc/sysdeps/linux/arm/sigaction.c
+++ b/libc/sysdeps/linux/arm/sigaction.c
@@ -1,20 +1,20 @@
-/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,1999,2000,2002,2003 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.
+ 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
- Library General Public License for more details.
+ Lesser 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.
+ 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.
Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
*/
@@ -25,11 +25,29 @@
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>
+extern int __syscall_sigaction (int, const struct old_kernel_sigaction *__unbounded,
+ struct old_kernel_sigaction *__unbounded);
+extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *__unbounded,
+ struct kernel_sigaction *__unbounded, size_t);
+
#define SA_RESTORER 0x04000000
extern void __default_sa_restorer(void);
extern void __default_rt_sa_restorer(void);
-#if defined __NR_rt_sigaction
+/* When RT signals are in use we need to use a different return stub. */
+#ifdef __NR_rt_sigreturn
+#define choose_restorer(flags) \
+ (flags & SA_SIGINFO) ? __default_rt_sa_restorer \
+ : __default_sa_restorer
+#else
+#define choose_restorer(flags) \
+ __default_sa_restorer
+#endif
+
+
+
+#ifdef __NR_rt_sigaction
+
/* 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. */
@@ -40,18 +58,21 @@ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oa
if (act) {
kact.k_sa_handler = act->sa_handler;
- memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask));
+ memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
kact.sa_flags = act->sa_flags;
# ifdef HAVE_SA_RESTORER
+ /* If the user specified SA_ONSTACK this means she is trying to
+ use the old-style stack switching. Unfortunately this
+ requires the sa_restorer field so we cannot install our own
+ handler. (In fact the user is likely to be out of luck anyway
+ since the kernel currently only supports stack switching via
+ the X/Open sigaltstack interface, but we allow for the
+ possibility that this might change in the future.) */
if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
kact.sa_restorer = act->sa_restorer;
} else {
- if (kact.sa_flags & SA_SIGINFO) {
- kact.sa_restorer = __default_rt_sa_restorer;
- } else {
- kact.sa_restorer = __default_sa_restorer;
- kact.sa_flags |= SA_RESTORER;
- }
+ kact.sa_restorer = choose_restorer (kact.sa_flags);
+ kact.sa_flags |= SA_RESTORER;
}
# endif
}
@@ -60,10 +81,9 @@ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oa
real size of the user-level sigset_t. */
result = __syscall_rt_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
-
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
- memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (oact->sa_mask));
+ memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
oact->sa_flags = koact.sa_flags;
# ifdef HAVE_SA_RESTORER
oact->sa_restorer = koact.sa_restorer;
@@ -75,6 +95,8 @@ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oa
#else
+
+
/* 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 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
@@ -91,14 +113,13 @@ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oa
if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK)) {
kact.sa_restorer = act->sa_restorer;
} else {
- kact.sa_restorer = __default_sa_restorer;
+ kact.sa_restorer = choose_restorer (kact.sa_flags);
kact.sa_flags |= SA_RESTORER;
}
# endif
}
result = __syscall_sigaction(sig, act ? __ptrvalue (&kact) : NULL,
oact ? __ptrvalue (&koact) : NULL);
-
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
oact->sa_mask.__val[0] = koact.sa_mask;
@@ -111,6 +132,5 @@ int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oa
}
#endif
-
weak_alias(__libc_sigaction, sigaction)