diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/unistd/sleep.c | 47 | ||||
| -rw-r--r-- | libc/unistd/usleep.c | 14 |
2 files changed, 28 insertions, 33 deletions
diff --git a/libc/unistd/sleep.c b/libc/unistd/sleep.c index b0031f022..d844d5b11 100644 --- a/libc/unistd/sleep.c +++ b/libc/unistd/sleep.c @@ -49,50 +49,45 @@ unsigned int sleep (unsigned int sec) unsigned int sleep (unsigned int seconds) { struct timespec ts = { .tv_sec = (long int) seconds, .tv_nsec = 0 }; - sigset_t set, oset; + sigset_t set; unsigned int result; /* This is not necessary but some buggy programs depend on this. */ - if (seconds == 0) - { + if (seconds == 0) { # ifdef CANCELLATION_P - CANCELLATION_P (THREAD_SELF); + CANCELLATION_P (THREAD_SELF); # endif - return 0; - } + return 0; + } /* Linux will wake up the system call, nanosleep, when SIGCHLD arrives even if SIGCHLD is ignored. We have to deal with it in libc. We block SIGCHLD first. */ __sigemptyset (&set); __sigaddset (&set, SIGCHLD); - sigprocmask (SIG_BLOCK, &set, &oset); /* can't fail */ + sigprocmask (SIG_BLOCK, &set, &set); /* never fails */ - /* If SIGCHLD is already blocked, we don't have to do anything. */ - if (!__sigismember (&oset, SIGCHLD)) - { - int saved_errno; + /* If SIGCHLD was already blocked, no need to check SIG_IGN. Else... */ + if (!__sigismember (&set, SIGCHLD)) { struct sigaction oact; - __sigemptyset (&set); - __sigaddset (&set, SIGCHLD); - + /* Is SIGCHLD set to SIG_IGN? */ sigaction (SIGCHLD, NULL, &oact); /* never fails */ + if (oact.sa_handler == SIG_IGN) { + //int saved_errno; - if (oact.sa_handler == SIG_IGN) - { - /* We should leave SIGCHLD blocked. */ + /* Yes, run nanosleep with SIGCHLD blocked. */ result = nanosleep (&ts, &ts); - saved_errno = errno; - /* Restore the original signal mask. */ - sigprocmask (SIG_SETMASK, &oset, NULL); - __set_errno (saved_errno); - } - else - { - /* We should unblock SIGCHLD. Restore the original signal mask. */ - sigprocmask (SIG_SETMASK, &oset, NULL); + /* Unblock SIGCHLD by restoring signal mask. */ + /* this sigprocmask call never fails, thus never updates errno, + and therefore we don't need to save/restore it. */ + //saved_errno = errno; + sigprocmask (SIG_SETMASK, &set, NULL); + //__set_errno (saved_errno); + } else { + /* No workaround needed, unblock SIGCHLD by restoring signal mask. */ + sigprocmask (SIG_SETMASK, &set, NULL); result = nanosleep (&ts, &ts); } } diff --git a/libc/unistd/usleep.c b/libc/unistd/usleep.c index 61ddb900a..8d01703ec 100644 --- a/libc/unistd/usleep.c +++ b/libc/unistd/usleep.c @@ -14,19 +14,19 @@ int usleep (__useconds_t usec) { - const struct timespec ts = { - .tv_sec = (long int) (usec / 1000000), - .tv_nsec = (long int) (usec % 1000000) * 1000ul - }; - return(nanosleep(&ts, NULL)); + const struct timespec ts = { + .tv_sec = (long int) (usec / 1000000), + .tv_nsec = (long int) (usec % 1000000) * 1000ul + }; + return nanosleep(&ts, NULL); } #else /* __UCLIBC_HAS_REALTIME__ */ int usleep (__useconds_t usec) { struct timeval tv; - tv.tv_sec = 0; - tv.tv_usec = usec; + tv.tv_sec = (long int) (usec / 1000000); + tv.tv_usec = (long int) (usec % 1000000); return select(0, NULL, NULL, NULL, &tv); } #endif /* __UCLIBC_HAS_REALTIME__ */ |