From 83eb4d5219f920fde59c9edd9204664f0c2f9f36 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Mon, 1 Dec 2008 18:00:04 +0000 Subject: 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). --- libc/sysdeps/linux/i386/sigaction.c | 62 ++++++++++++++++++++----------------- 1 file changed, 34 insertions(+), 28 deletions(-) (limited to 'libc/sysdeps/linux/i386') 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; } -- cgit v1.2.3