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, 2 insertions, 1 deletions

diff --git a/src/linux/ppoll.c b/src/linux/ppoll.c
index f0268894..9e262477 100644
--- a/src/linux/ppoll.c
+++ b/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);
 }