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.

arch/arm/syscall_arch.h

@@ -3,8 +3,6 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
-#define __SYSCALL_SSLEN 8
-
 #ifndef __clang__
 
 #define __asm_syscall(...) do { \

arch/i386/syscall_arch.h

@@ -3,8 +3,6 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))
 
-#define __SYSCALL_SSLEN 8
-
 static inline long __syscall0(long n)
 {
 	unsigned long __ret;

arch/microblaze/syscall_arch.h

@@ -3,8 +3,6 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
-#define __SYSCALL_SSLEN 8
-
 #ifndef __clang__
 
 static __inline long __syscall0(long n)

arch/mips/syscall_arch.h

@@ -3,8 +3,6 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
-#define __SYSCALL_SSLEN 16
-
 #ifndef __clang__
 
 #define __asm_syscall(...) do { \

arch/powerpc/syscall_arch.h

@@ -3,8 +3,6 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
-#define __SYSCALL_SSLEN 8
-
 long (__syscall)(long, ...);
 
 static inline long __syscall0(long n)

arch/x86_64/syscall_arch.h

@@ -1,8 +1,6 @@
 #define __SYSCALL_LL_E(x) (x)
 #define __SYSCALL_LL_O(x) (x)
 
-#define __SYSCALL_SSLEN 8
-
 static __inline long __syscall0(long n)
 {
 	unsigned long ret;

src/internal/pthread_impl.h

@@ -41,7 +41,7 @@ struct pthread {
 	int killlock[2];
 	int exitlock[2];
 	int startlock[2];
-	unsigned long sigmask[__SYSCALL_SSLEN/sizeof(long)];
+	unsigned long sigmask[_NSIG/8/sizeof(long)];
 };
 
 struct __timer {
@@ -89,10 +89,10 @@ struct __timer {
 
 #define SIGALL_SET ((sigset_t *)(const unsigned long long [2]){ -1,-1 })
 #define SIGPT_SET \
-	((sigset_t *)(const unsigned long [__SYSCALL_SSLEN/sizeof(long)]){ \
+	((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
 	[sizeof(long)==4] = 3UL<<(32*(sizeof(long)>4)) })
 #define SIGTIMER_SET \
-	((sigset_t *)(const unsigned long [__SYSCALL_SSLEN/sizeof(long)]){ \
+	((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
 	 0x80000000 })
 
 pthread_t __pthread_self_init(void);

src/linux/epoll.c

@@ -1,4 +1,5 @@
 #include <sys/epoll.h>
+#include <signal.h>
 #include "syscall.h"
 
 int epoll_create(int size)
@@ -18,7 +19,7 @@ int epoll_ctl(int fd, int op, int fd2, struct epoll_event *ev)
 
 int epoll_pwait(int fd, struct epoll_event *ev, int cnt, int to, const sigset_t *sigs)
 {
-	return syscall(SYS_epoll_pwait, fd, ev, cnt, to, sigs, __SYSCALL_SSLEN);
+	return syscall(SYS_epoll_pwait, fd, ev, cnt, to, sigs, _NSIG/8);
 }
 
 int epoll_wait(int fd, struct epoll_event *ev, int cnt, int to)

src/linux/ppoll.c

@@ -1,9 +1,10 @@
 #define _GNU_SOURCE
 #include <poll.h>
+#include <signal.h>
 #include "syscall.h"
 
 int ppoll(struct pollfd *fds, nfds_t n, const struct timespec *to, const sigset_t *mask)
 {
 	return syscall_cp(SYS_ppoll, fds, n,
-		to ? (struct timespec []){*to} : 0, mask, __SYSCALL_SSLEN);
+		to ? (struct timespec []){*to} : 0, mask, _NSIG/8);
 }

src/linux/signalfd.c

@@ -1,7 +1,8 @@
 #include <sys/signalfd.h>
+#include <signal.h>
 #include "syscall.h"
 
 int signalfd(int fd, const sigset_t *sigs, int flags)
 {
-	return syscall(SYS_signalfd, fd, sigs, __SYSCALL_SSLEN);
+	return syscall(SYS_signalfd, fd, sigs, _NSIG/8);
 }

src/select/pselect.c

@@ -1,10 +1,11 @@
 #include <sys/select.h>
+#include <signal.h>
 #include "syscall.h"
 #include "libc.h"
 
 int pselect(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, const struct timespec *restrict ts, const sigset_t *restrict mask)
 {
-	long data[2] = { (long)mask, __SYSCALL_SSLEN };
+	long data[2] = { (long)mask, _NSIG/8 };
 	struct timespec ts_tmp;
 	if (ts) ts_tmp = *ts;
 	return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, ts ? &ts_tmp : 0, data);

src/signal/raise.c

@@ -8,10 +8,10 @@ int raise(int sig)
 {
 	int pid, tid, ret;
 	sigset_t set;
-	__syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGALL_SET, &set, __SYSCALL_SSLEN);
+	__syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGALL_SET, &set, _NSIG/8);
 	tid = syscall(SYS_gettid);
 	pid = syscall(SYS_getpid);
 	ret = syscall(SYS_tgkill, pid, tid, sig);
-	__syscall(SYS_rt_sigprocmask, SIG_SETMASK, &set, 0, __SYSCALL_SSLEN);
+	__syscall(SYS_rt_sigprocmask, SIG_SETMASK, &set, 0, _NSIG/8);
 	return ret;
 }

src/signal/siglongjmp.c

@@ -6,6 +6,6 @@
 _Noreturn void siglongjmp(sigjmp_buf buf, int ret)
 {
 	if (buf->__fl) __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
-		buf->__ss, 0, __SYSCALL_SSLEN);
+		buf->__ss, 0, _NSIG/8);
 	longjmp(buf->__jb, ret);
 }

src/signal/sigpending.c

@@ -3,5 +3,5 @@
 
 int sigpending(sigset_t *set)
 {
-	return syscall(SYS_rt_sigpending, set, __SYSCALL_SSLEN);
+	return syscall(SYS_rt_sigpending, set, _NSIG/8);
 }

src/signal/sigsuspend.c

@@ -4,5 +4,5 @@
 
 int sigsuspend(const sigset_t *mask)
 {
-	return syscall_cp(SYS_rt_sigsuspend, mask, __SYSCALL_SSLEN);
+	return syscall_cp(SYS_rt_sigsuspend, mask, _NSIG/8);
 }

src/signal/sigtimedwait.c

@@ -7,7 +7,7 @@ int sigtimedwait(const sigset_t *restrict mask, siginfo_t *restrict si, const st
 {
 	int ret;
 	do ret = syscall_cp(SYS_rt_sigtimedwait, mask,
-		si, timeout, __SYSCALL_SSLEN);
+		si, timeout, _NSIG/8);
 	while (ret<0 && errno==EINTR);
 	return ret;
 }

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) {

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;

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;

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();
 }

src/time/timer_create.c

@@ -53,7 +53,7 @@ static void install_handler()
 	};
 	__libc_sigaction(SIGTIMER, &sa, 0);
 	__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
-		SIGTIMER_SET, 0, __SYSCALL_SSLEN);
+		SIGTIMER_SET, 0, _NSIG/8);
 }
 
 static void *start(void *arg)