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restore rev 1.23 to give clear SIGALRM handling example, 68 years

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are too long to affect real code
This commit is contained in:
Andrey A. Chernov 1998-09-08 09:44:46 +00:00
parent ac38e6e338
commit 7f41a65ede
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=38938
1 changed files with 16 additions and 28 deletions
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44
lib/libc/gen/sleep.c
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@ -44,38 +44,26 @@ 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;
{
while (seconds != 0) {
struct timespec time_to_sleep;
struct timespec time_remaining;
struct timespec time_to_sleep;
struct timespec time_remaining;
time_to_sleep.tv_sec = (seconds > INT_MAX) ? INT_MAX : seconds;
time_to_sleep.tv_nsec = 0;
/*
* 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));
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);
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 */
}