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Reviewed by: Andrey A. Chernov <ache@nagual.pp.ru>, Doug Rabson <dfr@nlsystems.com>

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Rewrote sleep() to remove int/long typing assumptions between the argument
    to the function and the timespec structure.
This commit is contained in:
Matthew Dillon 1998-09-06 09:11:06 +00:00
parent fe6894b6dc
commit 49d6409ac7
1 changed files with 29 additions and 17 deletions
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46
lib/libc/gen/sleep.c
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@ -36,7 +36,7 @@
static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93";
#endif
static char rcsid[] =
"$Id: sleep.c,v 1.22 1997/10/17 09:35:50 ache Exp $";
"$Id: sleep.c,v 1.23 1998/09/05 08:01:26 jb Exp $";
#endif /* LIBC_SCCS and not lint */
#include <errno.h>
@ -44,26 +44,38 @@ static char rcsid[] =
#include <time.h>
#include <unistd.h>
/*
* sleep() - attempt to sleep the specified number of seconds, returning
* any remaining unslept time if interrupted or 0 if the entire
* sleep completes without being interrupted. Avoid seconds vs
* time_t typing problems by breaking down large times with a
* loop.
*/
unsigned int
sleep(seconds)
unsigned int seconds;
{
struct timespec time_to_sleep;
struct timespec time_remaining;
while (seconds != 0) {
struct timespec time_to_sleep;
struct timespec time_remaining;
/*
* Avoid overflow when `seconds' is huge. This assumes that
* the maximum value for a time_t is >= INT_MAX.
*/
if (seconds > INT_MAX)
return (seconds - INT_MAX + sleep(INT_MAX));
time_to_sleep.tv_sec = (seconds > INT_MAX) ? INT_MAX : seconds;
time_to_sleep.tv_nsec = 0;
time_to_sleep.tv_sec = seconds;
time_to_sleep.tv_nsec = 0;
if (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 */
if (nanosleep(&time_to_sleep, &time_remaining) == -1) {
/*
* time_remaining only valid if EINTR, else assume no
* time elapsed.
*/
if (errno == EINTR)
seconds -= time_to_sleep.tv_sec - time_remaining.tv_sec;
if (time_remaining.tv_nsec)
++seconds;
break;
}
seconds -= time_to_sleep.tv_sec;
}
return(seconds);
}