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authorDenis Vlasenko <vda.linux@googlemail.com>2008-12-01 18:00:04 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-12-01 18:00:04 +0000
commit83eb4d5219f920fde59c9edd9204664f0c2f9f36 (patch)
treefd5a550be29c0c45d303cb10ea78b528dbe7978f /libc/sysdeps/linux/i386/sigaction.c
parent0e4d4dd89170d47a662f1cd0de1b4f3a5dbc1f2d (diff)
fix sigset_t size for mips (it's the only arch with 128 signals).
fix _NSIG for it. better document what's going on in sigaction(). seems to not induce any actual code changes (sans mips).
Diffstat (limited to 'libc/sysdeps/linux/i386/sigaction.c')
-rw-r--r--libc/sysdeps/linux/i386/sigaction.c62
1 files changed, 34 insertions, 28 deletions
diff --git a/libc/sysdeps/linux/i386/sigaction.c b/libc/sysdeps/linux/i386/sigaction.c
index 32c8f64bc..e323d0938 100644
--- a/libc/sysdeps/linux/i386/sigaction.c
+++ b/libc/sysdeps/linux/i386/sigaction.c
@@ -39,38 +39,44 @@ extern void restore (void) __asm__ ("__restore") attribute_hidden;
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)
{
- int result;
- struct kernel_sigaction kact, koact;
+ int result;
+ struct kernel_sigaction kact, koact;
+ enum {
+ SIGSET_MIN_SIZE = sizeof(kact.sa_mask) < sizeof(act->sa_mask)
+ ? sizeof(kact.sa_mask) : sizeof(act->sa_mask)
+ };
#ifdef SIGCANCEL
- if (sig == SIGCANCEL) {
- __set_errno (EINVAL);
- return -1;
- }
+ if (sig == SIGCANCEL) {
+ __set_errno (EINVAL);
+ return -1;
+ }
#endif
- if (act) {
- kact.k_sa_handler = act->sa_handler;
- memcpy (&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask));
- kact.sa_flags = act->sa_flags;
-
- kact.sa_flags = act->sa_flags | SA_RESTORER;
- kact.sa_restorer = ((act->sa_flags & SA_SIGINFO)
- ? &restore_rt : &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, 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));
- oact->sa_flags = koact.sa_flags;
- oact->sa_restorer = koact.sa_restorer;
- }
- return result;
+ if (act) {
+ kact.k_sa_handler = act->sa_handler;
+ memcpy (&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE);
+ kact.sa_flags = act->sa_flags;
+
+ kact.sa_flags = act->sa_flags | SA_RESTORER;
+ kact.sa_restorer = ((act->sa_flags & SA_SIGINFO)
+ ? &restore_rt : &restore);
+ }
+
+ /* NB: kernel (as of 2.6.25) will return EINVAL
+ * if sizeof(kact.sa_mask) does not match kernel's sizeof(sigset_t) */
+ result = __syscall_rt_sigaction(sig,
+ act ? __ptrvalue (&kact) : NULL,
+ oact ? __ptrvalue (&koact) : NULL,
+ sizeof(kact.sa_mask));
+
+ if (oact && result >= 0) {
+ oact->sa_handler = koact.k_sa_handler;
+ memcpy (&oact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE);
+ oact->sa_flags = koact.sa_flags;
+ oact->sa_restorer = koact.sa_restorer;
+ }
+ return result;
}