Reduce the size of the interposing table and amount of

cancellation-handling code in the libthr.  Translate some syscalls
into their more generic counterpart, and remove translated syscalls
from the table.

List of the affected syscalls:
creat, open -> openat
raise -> thr_kill
sleep, usleep -> nanosleep
pause -> sigsuspend
wait, wait3, waitpid -> wait4

Suggested and reviewed by:	jilles (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

1 files changed, 8 insertions, 15 deletions

diff --git a/lib/libc/gen/sleep.c b/lib/libc/gen/sleep.c
index f558e36..6bb4ecd 100644
--- a/lib/libc/gen/sleep.c
+++ b/lib/libc/gen/sleep.c
@@ -42,17 +42,8 @@ __FBSDID("$FreeBSD$");
 
 #include "libc_private.h"
 
-#pragma weak sleep
 unsigned int
-sleep(unsigned int seconds)
-{
-
-	return (((unsigned int (*)(unsigned int))
-	    __libc_interposing[INTERPOS_sleep])(seconds));
-}
-
-unsigned int
-__libc_sleep(unsigned int seconds)
+__sleep(unsigned int seconds)
 {
 	struct timespec time_to_sleep;
 	struct timespec time_remaining;
@@ -62,17 +53,19 @@ __libc_sleep(unsigned int seconds)
 	 * the maximum value for a time_t is >= INT_MAX.
 	 */
 	if (seconds > INT_MAX)
-		return (seconds - INT_MAX + __libc_sleep(INT_MAX));
+		return (seconds - INT_MAX + __sleep(INT_MAX));
 
 	time_to_sleep.tv_sec = seconds;
 	time_to_sleep.tv_nsec = 0;
-	if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
+	if (((int (*)(const struct timespec *, struct timespec *))
+	    __libc_interposing[INTERPOS_nanosleep])(
+	    &time_to_sleep, &time_remaining) != -1)
 		return (0);
 	if (errno != EINTR)
 		return (seconds);		/* best guess */
 	return (time_remaining.tv_sec +
-		(time_remaining.tv_nsec != 0)); /* round up */
+	    (time_remaining.tv_nsec != 0)); /* round up */
 }
 
-__weak_reference(__libc_sleep, __sleep);
-__weak_reference(__libc_sleep, _sleep);
+__weak_reference(__sleep, sleep);
+__weak_reference(__sleep, _sleep);