debloat: use __syscall instead of syscall where possible

don't waste time (and significant code size due to function call
overhead!) setting errno when the result of a syscall does not matter
or when it can't fail.

4 files changed, 5 insertions, 5 deletions

diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
index a0102674..b13318e5 100644
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -20,8 +20,8 @@ FILE *__fdopen(int fd, const char *mode)
 
 	/* Set append mode on fd if opened for append */
 	if (*mode == 'a') {
-		int flags = syscall(SYS_fcntl, fd, F_GETFL, 0);
-		syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
+		int flags = __syscall(SYS_fcntl, fd, F_GETFL);
+		__syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
 	}
 
 	f->fd = fd;
diff --git a/src/stdio/__lockfile.c b/src/stdio/__lockfile.c
index c0948255..4e0239e7 100644
--- a/src/stdio/__lockfile.c
+++ b/src/stdio/__lockfile.c
@@ -15,6 +15,6 @@ void __lockfile(FILE *f)
 	}
 	while (a_cas(&f->lock, 0, tid))
 		if (spins) spins--, a_spin();
-		else syscall(SYS_sched_yield);
+		else __syscall(SYS_sched_yield);
 	f->lockcount = 1;
 }
diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
index c2a350d1..469de6f0 100644
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -27,7 +27,7 @@ FILE *fopen(const char *filename, const char *mode)
 	f = __fdopen(fd, mode);
 	if (f) return f;
 
-	syscall(SYS_close, fd);
+	__syscall(SYS_close, fd);
 	return 0;
 }
 
diff --git a/src/stdio/tmpfile.c b/src/stdio/tmpfile.c
index 18c232f7..926d6601 100644
--- a/src/stdio/tmpfile.c
+++ b/src/stdio/tmpfile.c
@@ -17,7 +17,7 @@ FILE *tmpfile(void)
 		fd = syscall(SYS_open, s, O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600);
 		if (fd >= 0) {
 			f = __fdopen(fd, "w+");
-			syscall(SYS_unlink, s);
+			__syscall(SYS_unlink, s);
 			return f;
 		}
 	}