svn commit: r251433 - head/bin/sleep
Jilles Tjoelker
jilles at FreeBSD.org
Wed Jun 5 20:15:19 UTC 2013
Author: jilles
Date: Wed Jun 5 20:15:18 2013
New Revision: 251433
URL: http://svnweb.freebsd.org/changeset/base/251433
Log:
sleep: Explain in a comment why the [EINTR] check is there.
Suggested by: eadler
Modified:
head/bin/sleep/sleep.c
Modified: head/bin/sleep/sleep.c
==============================================================================
--- head/bin/sleep/sleep.c Wed Jun 5 19:54:28 2013 (r251432)
+++ head/bin/sleep/sleep.c Wed Jun 5 20:15:18 2013 (r251433)
@@ -82,6 +82,12 @@ main(int argc, char *argv[])
time_to_sleep.tv_nsec = 1e9 * (d - time_to_sleep.tv_sec);
signal(SIGINFO, report_request);
+
+ /*
+ * Note: [EINTR] is supposed to happen only when a signal was handled
+ * but the kernel also returns it when a ptrace-based debugger
+ * attaches. This is a bug but it is hard to fix.
+ */
while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
if (report_requested) {
/* Reporting does not bother with nanoseconds. */
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