* lib/xnanosleep.c (xnanosleep): When the duration is the positive
infinity, use pause instead of nanosleep.
---
lib/xnanosleep.c | 42 ++++++++++++++++++++++++++++--------------
1 file changed, 28 insertions(+), 14 deletions(-)
diff --git a/lib/xnanosleep.c b/lib/xnanosleep.c
index 5774f75f3..58a2f5254 100644
--- a/lib/xnanosleep.c
+++ b/lib/xnanosleep.c
@@ -25,7 +25,9 @@
#include <timespec.h>
#include <errno.h>
+#include <math.h>
#include <time.h>
+#include <unistd.h>
/* Sleep until the time (call it WAKE_UP_TIME) specified as
SECONDS seconds after the time this function is called.
@@ -37,21 +39,33 @@
int
xnanosleep (double seconds)
{
- struct timespec ts_sleep = dtotimespec (seconds);
-
- for (;;)
+ if (!isfinite(seconds) && seconds > 0)
+ {
+ for (;;)
+ {
+ pause();
+ if (errno != EINTR)
+ return -1;
+ }
+ }
+ else
{
- /* Linux-2.6.8.1's nanosleep returns -1, but doesn't set errno
- when resumed after being suspended. Earlier versions would
- set errno to EINTR. nanosleep from linux-2.6.10, as well as
- implementations by (all?) other vendors, doesn't return -1
- in that case; either it continues sleeping (if time remains)
- or it returns zero (if the wake-up time has passed). */
- errno = 0;
- if (nanosleep (&ts_sleep, NULL) == 0)
- break;
- if (errno != EINTR && errno != 0)
- return -1;
+ struct timespec ts_sleep = dtotimespec (seconds);
+
+ for (;;)
+ {
+ /* Linux-2.6.8.1's nanosleep returns -1, but doesn't set errno
+ when resumed after being suspended. Earlier versions would
+ set errno to EINTR. nanosleep from linux-2.6.10, as well as
+ implementations by (all?) other vendors, doesn't return -1
+ in that case; either it continues sleeping (if time remains)
+ or it returns zero (if the wake-up time has passed). */
+ errno = 0;
+ if (nanosleep (&ts_sleep, NULL) == 0)
+ break;
+ if (errno != EINTR && errno != 0)
+ return -1;
+ }
}
return 0;
--
2.25.0
