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authorDenys Vlasenko <vda.linux@googlemail.com>2009-09-09 01:34:30 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2009-09-09 01:34:30 +0200
commit39142c932fccc38c3323a1d1ae9eb743d1bef01c (patch)
tree31241ce468a0e56fb28e53851dccb71a14072ca4 /libc/sysdeps
parentdaad89426b6fc2b2a3835d48d676e90860d2cd41 (diff)
sparc/sigaction.c: note possible bugs by comments. style fixes
no code is actually changed Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libc/sysdeps')
-rw-r--r--libc/sysdeps/linux/sparc/sigaction.c106
1 files changed, 57 insertions, 49 deletions
diff --git a/libc/sysdeps/linux/sparc/sigaction.c b/libc/sysdeps/linux/sparc/sigaction.c
index 67db1c8f9..950fa2645 100644
--- a/libc/sysdeps/linux/sparc/sigaction.c
+++ b/libc/sysdeps/linux/sparc/sigaction.c
@@ -31,48 +31,52 @@
_syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
-static void __rt_sigreturn_stub (void);
-static void __sigreturn_stub (void);
+static void __rt_sigreturn_stub(void);
+static void __sigreturn_stub(void);
-int
-__libc_sigaction (int sig, __const struct sigaction *act, struct sigaction *oact)
+int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
- int ret;
- struct old_kernel_sigaction kact, koact;
- unsigned long stub = 0;
- int saved_errno = errno;
-
- if (act)
- {
- kact.k_sa_handler = act->sa_handler;
- memcpy (&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
- if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO)!= 0)
- stub = (unsigned long) &__rt_sigreturn_stub;
- else
- stub = (unsigned long) &__sigreturn_stub;
- stub -= 8;
- kact.sa_restorer = NULL;
- }
- /* XXX The size argument hopefully will have to be changed to the real size of the user-level sigset_t. */
- ret = rt_sigaction(sig,
- (int)(act ? &kact : NULL),
- (int)(oact ? &koact : NULL),
- stub,
- _NSIG / 8);
+ int ret;
+ struct old_kernel_sigaction kact, koact;
+ unsigned long stub = 0;
+ int saved_errno = errno;
- if (ret >= 0 || errno != ENOSYS)
- {
- if (oact && ret >= 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 ret;
- }
- __set_errno (saved_errno);
- return -1;
+ if (act) {
+ kact.k_sa_handler = act->sa_handler;
+ // BUG?! kact.sa_mask is a long, but sigset_t is a vector
+ // of longs and it may be bigger (in glibc, it _is_ bigger).
+ // Should we do this instead?
+ // kact.sa_mask = act->sa_mask.__val[0];
+ memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
+ kact.sa_flags = act->sa_flags;
+ if (kact.sa_flags & SA_SIGINFO)
+ stub = (unsigned long) &__rt_sigreturn_stub;
+ else
+ stub = (unsigned long) &__sigreturn_stub;
+ stub -= 8;
+ kact.sa_restorer = NULL;
+ }
+ /* NB: kernel (as of 2.6.25) will return EINVAL
+ * if _NSIG / 8 does not match kernel's sizeof(sigset_t) */
+ ret = rt_sigaction(sig,
+ (int)(act ? &kact : NULL),
+ (int)(oact ? &koact : NULL),
+ stub,
+ _NSIG / 8);
+
+ // BUG?! if ret == -1, we return -1 but do not set errno?!
+ if (ret >= 0 || errno != ENOSYS) {
+ if (oact && ret >= 0) {
+ oact->sa_handler = koact.k_sa_handler;
+ // maybe oact->sa_mask.__val[0] = koact.sa_mask; ?
+ memcpy(&oact->sa_mask, &koact.sa_mask, sizeof(sigset_t));
+ oact->sa_flags = koact.sa_flags;
+ oact->sa_restorer = koact.sa_restorer;
+ }
+ return ret;
+ }
+ __set_errno(saved_errno);
+ return -1;
}
#ifndef LIBC_SIGACTION
@@ -81,18 +85,22 @@ libc_hidden_weak(sigaction)
#endif
static void
-__rt_sigreturn_stub (void)
+__rt_sigreturn_stub(void)
{
- __asm__ ("mov %0, %%g1\n\t"
- "ta 0x10\n\t"
- : /* no outputs */
- : "i" (__NR_rt_sigreturn));
+ __asm__(
+ "mov %0, %%g1\n\t"
+ "ta 0x10\n\t"
+ : /* no outputs */
+ : "i" (__NR_rt_sigreturn)
+ );
}
static void
-__sigreturn_stub (void)
+__sigreturn_stub(void)
{
- __asm__ ("mov %0, %%g1\n\t"
- "ta 0x10\n\t"
- : /* no outputs */
- : "i" (__NR_sigreturn));
+ __asm__(
+ "mov %0, %%g1\n\t"
+ "ta 0x10\n\t"
+ : /* no outputs */
+ : "i" (__NR_sigreturn)
+ );
}