From: Ben Harris <bjh21@bjh21.me.uk>
Date: Sun, 18 Nov 2018 11:46:50 +0000 (+0000)
Subject: Correct error handling for clock_nanosleep().
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=aaba2422dce96db32b8cf188a6d814abdf1a2a43;p=clunk.git

Correct error handling for clock_nanosleep().

It apparently returns its errors rather than setting errno.
---

diff --git a/clunk.c b/clunk.c
index aebd1db..32d7db7 100644
--- a/clunk.c
+++ b/clunk.c
@@ -1,4 +1,5 @@
 #include <err.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdbool.h>
@@ -89,7 +90,9 @@ pulse()
 		err(1, "sigprocmask(block)");
 	dummy_out(true);
 	record_tick();
-	clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
+	errno = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
+	if (errno != 0)
+		err(1, "clock_nanosleep");
 	dummy_out(false);
 	if (sigprocmask(SIG_SETMASK, &saved_mask, NULL) != 0)
 		err(1, "sigprocmask(restore)");
@@ -209,8 +212,9 @@ run()
 		/* Choose when next tick will be. */
 		ts.tv_nsec = 1000000000 - pulsewidth;
 		ts.tv_sec += tick - 1;
-		if (clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &ts, NULL)
-		    != 0)
+		errno =	clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME,
+					&ts, NULL);
+		if (errno != 0)
 			err(1, "clock_nanosleep");
 	}
 }