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authorDenis Vlasenko <vda.linux@googlemail.com>2008-12-15 09:29:33 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-12-15 09:29:33 +0000
commit885f507317b6c8576ba2e298c2249d27ea6f8404 (patch)
tree6d9a70d14c2f21d85538a023c7e2e863245c49e6 /libc/sysdeps/linux/common
parent1cfb1a324798f6ed03e49813d8dfe6b28dfb9c4f (diff)
sigaction overhaul as described in docs/sigaction.txt
Run tested on i386.
Diffstat (limited to 'libc/sysdeps/linux/common')
-rw-r--r--libc/sysdeps/linux/common/bits/kernel_sigaction.h67
-rw-r--r--libc/sysdeps/linux/common/bits/sigaction.h42
-rw-r--r--libc/sysdeps/linux/common/bits/sigset.h6
3 files changed, 33 insertions, 82 deletions
diff --git a/libc/sysdeps/linux/common/bits/kernel_sigaction.h b/libc/sysdeps/linux/common/bits/kernel_sigaction.h
index a39aa324b..f74e0a28a 100644
--- a/libc/sysdeps/linux/common/bits/kernel_sigaction.h
+++ b/libc/sysdeps/linux/common/bits/kernel_sigaction.h
@@ -4,72 +4,33 @@
/* This file provides whatever this particular arch's kernel thinks
* the sigaction struct should look like... */
-#undef NO_OLD_SIGACTION
-#if defined(__mips__)
-/* We have libc/sysdeps/linux/mips/bits/kernel_sigaction.h,
- * so this should never be used. Lets see whether it is true. */
-struct BUG_is_here { char BUG_is_here[-1]; };
+#if defined(__ia64__)
#undef HAVE_SA_RESTORER
-/* This is the sigaction structure from the Linux 2.1.24 kernel. */
-#include <sgidefs.h>
-struct old_kernel_sigaction {
- __sighandler_t k_sa_handler;
- unsigned int sa_flags;
- unsigned long sa_mask;
-};
-#define _KERNEL_NSIG 128
-#define _KERNEL_NSIG_BPW 32
-#define _KERNEL_NSIG_WORDS (_KERNEL_NSIG / _KERNEL_NSIG_BPW)
-typedef struct {
- unsigned long sig[_KERNEL_NSIG_WORDS];
-} kernel_sigset_t;
-/* This is the sigaction structure from the Linux 2.1.68 kernel. */
-struct kernel_sigaction {
- unsigned int sa_flags;
- __sighandler_t k_sa_handler;
- kernel_sigset_t sa_mask;
- void (*sa_restorer)(void);
- int s_resv[1]; /* reserved */
-};
-
-#elif defined(__ia64__)
-
-#define NO_OLD_SIGACTION
-#undef HAVE_SA_RESTORER
-struct kernel_sigaction {
- __sighandler_t k_sa_handler;
- unsigned long sa_flags;
- sigset_t sa_mask;
-};
#else
#define HAVE_SA_RESTORER
/* This is the sigaction structure from the Linux 2.1.20 kernel. */
struct old_kernel_sigaction {
- __sighandler_t k_sa_handler;
- unsigned long sa_mask;
- unsigned long sa_flags;
- void (*sa_restorer) (void);
-};
-/* This is the sigaction structure from the Linux 2.1.68 kernel. */
-struct kernel_sigaction {
- __sighandler_t k_sa_handler;
- unsigned long sa_flags;
- void (*sa_restorer) (void);
- sigset_t sa_mask;
+ __sighandler_t k_sa_handler;
+ unsigned long sa_mask;
+ unsigned long sa_flags;
+ void (*sa_restorer)(void);
};
+/* In uclibc, userspace struct sigaction is identical to
+ * "new" struct kernel_sigaction (one from the Linux 2.1.68 kernel).
+ * See sigaction.h
+ */
-#endif
-
-#ifndef NO_OLD_SIGACTION
-extern int __syscall_sigaction (int, const struct old_kernel_sigaction *,
+extern int __syscall_sigaction(int, const struct old_kernel_sigaction *,
struct old_kernel_sigaction *) attribute_hidden;
+
#endif
-extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
- struct kernel_sigaction *, size_t) attribute_hidden;
+
+extern int __syscall_rt_sigaction(int, const struct sigaction *,
+ struct sigaction *, size_t) attribute_hidden;
#endif /* _BITS_SIGACTION_STRUCT_H */
diff --git a/libc/sysdeps/linux/common/bits/sigaction.h b/libc/sysdeps/linux/common/bits/sigaction.h
index 48cc5312f..7489aa878 100644
--- a/libc/sysdeps/linux/common/bits/sigaction.h
+++ b/libc/sysdeps/linux/common/bits/sigaction.h
@@ -21,34 +21,26 @@
# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
#endif
-/* Structure describing the action to be taken when a signal arrives. */
-struct sigaction
- {
- /* Signal handler. */
+/* Structure describing the action to be taken when a signal arrives.
+ * In uclibc, it is identical to "new" struct kernel_sigaction
+ * (one from the Linux 2.1.68 kernel).
+ * This minimizes amount of translation in sigaction().
+ */
+struct sigaction {
#ifdef __USE_POSIX199309
- union
- {
- /* Used if SA_SIGINFO is not set. */
- __sighandler_t sa_handler;
- /* Used if SA_SIGINFO is set. */
- void (*sa_sigaction) (int, siginfo_t *, void *);
- }
- __sigaction_handler;
-# define sa_handler __sigaction_handler.sa_handler
-# define sa_sigaction __sigaction_handler.sa_sigaction
+ union {
+ __sighandler_t sa_handler;
+ void (*sa_sigaction)(int, siginfo_t *, void *);
+ } __sigaction_handler;
+# define sa_handler __sigaction_handler.sa_handler
+# define sa_sigaction __sigaction_handler.sa_sigaction
#else
- __sighandler_t sa_handler;
+ __sighandler_t sa_handler;
#endif
-
- /* Additional set of signals to be blocked. */
- __sigset_t sa_mask;
-
- /* Special flags. */
- int sa_flags;
-
- /* Restore handler. */
- void (*sa_restorer) (void);
- };
+ unsigned long sa_flags;
+ void (*sa_restorer)(void);
+ sigset_t sa_mask;
+};
/* Bits in `sa_flags'. */
#define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
diff --git a/libc/sysdeps/linux/common/bits/sigset.h b/libc/sysdeps/linux/common/bits/sigset.h
index 7ec87eb1d..2f67a4ebf 100644
--- a/libc/sysdeps/linux/common/bits/sigset.h
+++ b/libc/sysdeps/linux/common/bits/sigset.h
@@ -29,10 +29,8 @@ typedef int __sig_atomic_t;
* where they might have (or had in the past) 32 signals only,
* I hope it's irrelevant now.
* Signal 0 does not exist, so we have signals 1..64, not 0..63.
- * Note that struct sigaction has embedded sigset_t,
- * and this necessitates translation in sigaction()
- * to convert it to struct kernel_sigaction.
- * See libc/.../sigaction.c, libc/.../kernel_sigaction.h
+ * In uclibc, kernel and userspace sigset_t is always the same.
+ * BTW, struct sigaction is also the same on kernel and userspace side.
*/
#if defined(__mips__)
# define _SIGSET_NWORDS (128 / (8 * sizeof (unsigned long)))