sleep: code shrink

Use less stack by using same "sigset_t set" object for new and saved
signal set, remove redundant clearing of set, and do not save/restore
errno around sigprocmask(SIG_SETMASK) - it never changes it.

While at it, improve comments and make code style consistent
across sleep.c file.

    text           data     bss     dec     hex filename
-    242              0       0     242      f2 libc/unistd/sleep.o
+    197              0       0     197      c5 libc/unistd/sleep.o

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/libc/unistd/usleep.c b/libc/unistd/usleep.c
index 61ddb900a..8d01703ec 100644
--- a/libc/unistd/usleep.c
+++ b/libc/unistd/usleep.c
@@ -14,19 +14,19 @@
 
 int usleep (__useconds_t usec)
 {
-    const struct timespec ts = {
-	.tv_sec = (long int) (usec / 1000000),
-	.tv_nsec = (long int) (usec % 1000000) * 1000ul
-    };
-    return(nanosleep(&ts, NULL));
+	const struct timespec ts = {
+		.tv_sec = (long int) (usec / 1000000),
+		.tv_nsec = (long int) (usec % 1000000) * 1000ul
+	};
+	return nanosleep(&ts, NULL);
 }
 #else /* __UCLIBC_HAS_REALTIME__ */
 int usleep (__useconds_t usec)
 {
 	struct timeval tv;
 
-	tv.tv_sec = 0;
-	tv.tv_usec = usec;
+	tv.tv_sec = (long int) (usec / 1000000);
+	tv.tv_usec = (long int) (usec % 1000000);
 	return select(0, NULL, NULL, NULL, &tv);
 }
 #endif /* __UCLIBC_HAS_REALTIME__ */