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This commit is contained in:
Jim Meyering
1999-12-27 14:17:39 +00:00
parent f71e656070
commit dc33452012
1 changed files with 20 additions and 25 deletions
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45
lib/nanosleep.c
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@@ -36,38 +36,29 @@ extern int errno;
#include <sys/time.h>
static int suspended;
int first_call = 1;
/* Handle SIGCONT. */
static void
sighandler (int sig)
{
#ifdef SA_INTERRUPT
struct sigaction sigact;
sigact.sa_handler = SIG_DFL;
sigemptyset (&sigact.sa_mask);
sigact.sa_flags = 0;
sigaction (sig, &sigact, NULL);
#else
signal (sig, SIG_DFL);
#endif
suspended = 1;
kill (getpid (), sig);
}
/* Sleep for USEC microseconds. */
/* FIXME: comment */
static void
my_usleep (const struct timespec *ts_delay)
{
struct timeval tv_delay;
tv_delay.tv_sec = ts_delay->tv_sec;
tv_delay.tv_usec = 1000 * ts_delay->tv_nsec;
tv_delay.tv_usec = ts_delay->tv_nsec / 1000;
select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
}
/* FIXME: comment */
int
nanosleep (const struct timespec *requested_delay,
struct timespec *remaining_delay)
@@ -78,19 +69,23 @@ nanosleep (const struct timespec *requested_delay,
suspended = 0;
/* set up sig handler -- but maybe only do this the first time? */
/* set up sig handler */
if (first_call)
{
#ifdef SA_INTERRUPT
newact.sa_handler = sighandler;
sigemptyset (&newact.sa_mask);
newact.sa_flags = 0;
newact.sa_handler = sighandler;
sigemptyset (&newact.sa_mask);
newact.sa_flags = 0;
sigaction (SIGCONT, NULL, &oldact);
if (oldact.sa_handler != SIG_IGN)
sigaction (SIGCONT, &newact, NULL);
sigaction (SIGCONT, NULL, &oldact);
if (oldact.sa_handler != SIG_IGN)
sigaction (SIGCONT, &newact, NULL);
#else
if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
signal (SIGCONT, sighandler);
if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
signal (SIGCONT, sighandler);
#endif
first_call = 0;
}
my_usleep (requested_delay);
@@ -99,11 +94,11 @@ nanosleep (const struct timespec *requested_delay,
/* Calculate time remaining. */
/* FIXME: the code in sleep doesn't use this, so there's no
rush to implement it. */
errno = EINTR;
}
/* FIXME: Restore sig handler? */
errno = EINTR;
return suspended;
}