remove __SYSCALL_SSLEN arch macro in favor of using public _NSIG

the issue at hand is that many syscalls require as an argument the
kernel-ABI size of sigset_t, intended to allow the kernel to switch to
a larger sigset_t in the future. previously, each arch was defining
this size in syscall_arch.h, which was redundant with the definition
of _NSIG in bits/signal.h. as it's used in some not-quite-portable
application code as well, _NSIG is much more likely to be recognized
and understood immediately by someone reading the code, and it's also
shorter and less cluttered.

note that _NSIG is actually 65/129, not 64/128, but the division takes
care of throwing away the off-by-one part.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c
index f6102ad4..b274bd0d 100644
--- a/src/thread/pthread_sigmask.c
+++ b/src/thread/pthread_sigmask.c
@@ -7,7 +7,7 @@ int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict ol
 {
 	int ret;
 	if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL;
-	ret = -__syscall(SYS_rt_sigprocmask, how, set, old, __SYSCALL_SSLEN);
+	ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8);
 	if (!ret && old) {
 		if (sizeof old->__bits[0] == 8) {
 			old->__bits[0] &= ~0x380000000ULL;