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.

4 files changed, 9 insertions, 9 deletions

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index d11dcfaf..059c20e7 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -40,7 +40,7 @@ _Noreturn void pthread_exit(void *result)
 		if (self->detached == 2)
 			__syscall(SYS_set_tid_address, 0);
 		__syscall(SYS_rt_sigprocmask, SIG_BLOCK,
-			SIGALL_SET, 0, __SYSCALL_SSLEN);
+			SIGALL_SET, 0, _NSIG/8);
 		__unmapself(self->map_base, self->map_size);
 	}
 
@@ -69,11 +69,11 @@ static int start(void *p)
 			pthread_exit(0);
 		}
 		__syscall(SYS_rt_sigprocmask, SIG_SETMASK,
-			self->sigmask, 0, __SYSCALL_SSLEN);
+			self->sigmask, 0, _NSIG/8);
 	}
 	if (self->unblock_cancel)
 		__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
-			SIGPT_SET, 0, __SYSCALL_SSLEN);
+			SIGPT_SET, 0, _NSIG/8);
 	pthread_exit(self->start(self->start_arg));
 	return 0;
 }
@@ -171,7 +171,7 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp
 	if (attr._a_sched) {
 		do_sched = new->startlock[0] = 1;
 		__syscall(SYS_rt_sigprocmask, SIG_BLOCK,
-			SIGALL_SET, self->sigmask, __SYSCALL_SSLEN);
+			SIGALL_SET, self->sigmask, _NSIG/8);
 	}
 	new->unblock_cancel = self->cancel;
 	new->canary = self->canary;
@@ -183,7 +183,7 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp
 
 	if (do_sched) {
 		__syscall(SYS_rt_sigprocmask, SIG_SETMASK,
-			new->sigmask, 0, __SYSCALL_SSLEN);
+			new->sigmask, 0, _NSIG/8);
 	}
 
 	if (ret < 0) {
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;
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;
diff --git a/src/thread/synccall.c b/src/thread/synccall.c
index dc59863f..8c825ace 100644
--- a/src/thread/synccall.c
+++ b/src/thread/synccall.c
@@ -62,7 +62,7 @@ void __synccall(void (*func)(void *), void *ctx)
 	__inhibit_ptc();
 
 	__syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGALL_SET,
-		&oldmask, __SYSCALL_SSLEN);
+		&oldmask, _NSIG/8);
 
 	sem_init(&chaindone, 0, 0);
 	sem_init(&chainlock, 0, 1);
@@ -95,7 +95,7 @@ void __synccall(void (*func)(void *), void *ctx)
 	__libc_sigaction(SIGSYNCCALL, &sa, 0);
 
 	__syscall(SYS_rt_sigprocmask, SIG_SETMASK,
-		&oldmask, 0, __SYSCALL_SSLEN);
+		&oldmask, 0, _NSIG/8);
 
 	__release_ptc();
 }