consistently use _NSIG/8 idiom for kernel sigset size in sigaction

this code in sigaction was the only place where sizeof was being
applied to the kernel sigaction's mask member to get the size argument
to pass to the kernel. everywhere else, _NSIG/8 is used for this
purpose.

diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c
index 79989500a9d6b77d53221244ea2c782eb8aa9e50..ac9a3ac2fa7e03acd49889b9fa1c22a36f72802a 100644 (file)
--- a/src/signal/sigaction.c
+++ b/src/signal/sigaction.c
@@ -53,9 +53,9 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact
                ksa.handler = sa->sa_handler;
                ksa.flags = sa->sa_flags | SA_RESTORER;
                ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
-               memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask);
+               memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
        }
-       int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, sizeof ksa.mask);
+       int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
        if (sig == SIGABRT && sa && sa->sa_handler != SIG_DFL) {
                UNLOCK(__abort_lock);
                __restore_sigs(&set);
@@ -63,7 +63,7 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact
        if (old && !r) {
                old->sa_handler = ksa_old.handler;
                old->sa_flags = ksa_old.flags;
-               memcpy(&old->sa_mask, &ksa_old.mask, sizeof ksa_old.mask);
+               memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
        }
        return __syscall_ret(r);
 }