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_self.c b/src/thread/pthread_self.c
index 23dbaa5e..c50a2fb5 100644
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -9,7 +9,7 @@ weak_alias(dummy, __pthread_tsd_main);
 static int init_main_thread()
 {
 	__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
-		SIGPT_SET, 0, __SYSCALL_SSLEN);
+		SIGPT_SET, 0, _NSIG/8);
 	if (__set_thread_area(TP_ADJ(main_thread)) < 0) return -1;
 	main_thread->canceldisable = libc.canceldisable;
 	main_thread->tsd = (void **)__pthread_tsd_main;