diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/unistd/Makefile | 4 | ||||
| -rw-r--r-- | libc/unistd/sleep.c | 112 | ||||
| -rw-r--r-- | libc/unistd/usleep.c | 13 |
3 files changed, 113 insertions, 16 deletions
diff --git a/libc/unistd/Makefile b/libc/unistd/Makefile index d481bb5ad..12f3f6f2e 100644 --- a/libc/unistd/Makefile +++ b/libc/unistd/Makefile @@ -26,8 +26,8 @@ include $(TOPDIR)Rules.mak DIRS:= CSRC=execl.c execlp.c execv.c execvep.c execvp.c execle.c getcwd.c getopt.c \ - sleep.c getpass.c sysconf_src.c getopt_vars.c getlogin.c fpathconf.c \ - confstr.c pathconf.c + sleep.c usleep.c getpass.c sysconf_src.c getopt_vars.c getlogin.c \ + fpathconf.c confstr.c pathconf.c ifeq ($(strip $(HAS_MMU)),true) CSRC+=daemon.c endif diff --git a/libc/unistd/sleep.c b/libc/unistd/sleep.c index b6c410fb5..f67d969e3 100644 --- a/libc/unistd/sleep.c +++ b/libc/unistd/sleep.c @@ -1,24 +1,108 @@ +/* Implementation of the POSIX sleep function using nanosleep. + Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. -#include <sys/time.h> -#include <sys/types.h> + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <time.h> +#include <signal.h> #include <unistd.h> -int usleep (__useconds_t usec) +#if 0 +/* This is a quick and dirty, but not 100% compliant with + * the stupid SysV SIGCHLD vs. SIG_IGN behaviour. It is + * fine unless you are messing with SIGCHLD... */ +unsigned int sleep (unsigned int sec) { - struct timeval tv; - - tv.tv_sec = usec / 1000000; - tv.tv_usec = usec % 1000000; - return(select(0, 0, 0, 0, &tv)); + struct timespec ts = { + tv_sec: (long int)(sec / 1000000), + tv_nsec: 0 + }; + nanosleep(&ts, &ts); + return(sec-ts.tv_sec); } -unsigned int sleep(unsigned int sec) +#else + +/* We are going to use the `nanosleep' syscall of the kernel. But the + kernel does not implement the sstupid SysV SIGCHLD vs. SIG_IGN + behaviour for this syscall. Therefore we have to emulate it here. */ +unsigned int sleep (unsigned int seconds) { - struct timeval tv; + struct timespec ts = { tv_sec: (long int) seconds, tv_nsec: 0 }; + sigset_t set, oset; + unsigned int result; + + /* This is not necessary but some buggy programs depend on this. */ + if (seconds == 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. */ + if (__sigemptyset (&set) < 0 + || __sigaddset (&set, SIGCHLD) < 0 + || sigprocmask (SIG_BLOCK, &set, &oset)) + return -1; + + /* If SIGCHLD is already blocked, we don't have to do anything. */ + if (!__sigismember (&oset, SIGCHLD)) + { + int saved_errno; + struct sigaction oact; + + if (__sigemptyset (&set) < 0 || __sigaddset (&set, SIGCHLD) < 0) + return -1; + + /* We get the signal handler for SIGCHLD. */ + if (sigaction (SIGCHLD, (struct sigaction *) NULL, &oact) < 0) + { + saved_errno = errno; + /* Restore the original signal mask. */ + (void) sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); + __set_errno (saved_errno); + return -1; + } + + if (oact.sa_handler == SIG_IGN) + { + /* We should leave SIGCHLD blocked. */ + result = nanosleep (&ts, &ts); + + saved_errno = errno; + /* Restore the original signal mask. */ + (void) sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); + __set_errno (saved_errno); + } + else + { + /* We should unblock SIGCHLD. Restore the original signal mask. */ + (void) sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL); + result = nanosleep (&ts, &ts); + } + } + else + result = nanosleep (&ts, &ts); + + if (result != 0) + /* Round remaining time. */ + result = (unsigned int) ts.tv_sec + (ts.tv_nsec >= 500000000L); - tv.tv_sec = sec; - tv.tv_usec = 0; - select(0, 0, 0, 0, &tv); - return tv.tv_sec; + return result; } +#endif diff --git a/libc/unistd/usleep.c b/libc/unistd/usleep.c new file mode 100644 index 000000000..25979681d --- /dev/null +++ b/libc/unistd/usleep.c @@ -0,0 +1,13 @@ +#include <time.h> +#include <sys/time.h> +#include <sys/types.h> +#include <unistd.h> + +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)); +} + |