diff options
Diffstat (limited to 'libc/sysdeps/linux/common/pselect.c')
| -rw-r--r-- | libc/sysdeps/linux/common/pselect.c | 108 |
1 files changed, 40 insertions, 68 deletions
diff --git a/libc/sysdeps/linux/common/pselect.c b/libc/sysdeps/linux/common/pselect.c index 7e93537dd..2b590f524 100644 --- a/libc/sysdeps/linux/common/pselect.c +++ b/libc/sysdeps/linux/common/pselect.c @@ -17,78 +17,50 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include <errno.h> -#include <signal.h> -#include <stddef.h> /* For NULL. */ -#include <sys/time.h> -#include <sys/select.h> -#ifdef __UCLIBC_HAS_THREADS_NATIVE__ -#include <sysdep-cancel.h> -#endif +#include <features.h> -libc_hidden_proto(sigprocmask) -libc_hidden_proto(select) +#ifdef __USE_XOPEN2K +#include <sys/syscall.h> +#include <sys/select.h> +#include <sys/time.h> +#include <signal.h> +#include <cancel.h> -/* Check the first NFDS descriptors each in READFDS (if not NULL) for read - readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS - (if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out - after waiting the interval specified therein. Additionally set the sigmask - SIGMASK for this call. Returns the number of ready descriptors, or -1 for - errors. */ -#ifdef __UCLIBC_HAS_THREADS_NATIVE__ -static int -__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, -#else -int -pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, -#endif - const struct timespec *timeout, const sigset_t *sigmask) +static int __NC(pselect)(int nfds, fd_set *readfds, fd_set *writefds, + fd_set *exceptfds, const struct timespec *timeout, + const sigset_t *sigmask) { - struct timeval tval; - int retval; - sigset_t savemask; - - /* Change nanosecond number to microseconds. This might mean losing - precision and therefore the `pselect` should be available. But - for now it is hardly found. */ - if (timeout != NULL) - TIMESPEC_TO_TIMEVAL (&tval, timeout); - - /* The setting and restoring of the signal mask and the select call - should be an atomic operation. This can't be done without kernel - help. */ - if (sigmask != NULL) - sigprocmask (SIG_SETMASK, sigmask, &savemask); - - /* Note the pselect() is a cancellation point. But since we call - select() which itself is a cancellation point we do not have - to do anything here. */ - retval = select (nfds, readfds, writefds, exceptfds, - timeout != NULL ? &tval : NULL); - - if (sigmask != NULL) - sigprocmask (SIG_SETMASK, &savemask, NULL); - - return retval; + struct timeval tval; + int retval; + sigset_t savemask; + + /* Change nanosecond number to microseconds. This might mean losing + precision and therefore the `pselect` should be available. But + for now it is hardly found. */ + if (timeout != NULL) + TIMESPEC_TO_TIMEVAL (&tval, timeout); + + /* The setting and restoring of the signal mask and the select call + should be an atomic operation. This can't be done without kernel + help. */ + if (sigmask != NULL) + sigprocmask (SIG_SETMASK, sigmask, &savemask); + + /* The comment below does not apply on uClibc, since we use __select_nocancel */ + /* Note the pselect() is a cancellation point. But since we call + select() which itself is a cancellation point we do not have + to do anything here. */ + retval = __NC(select)(nfds, readfds, writefds, exceptfds, + timeout != NULL ? &tval : NULL); + + if (sigmask != NULL) + sigprocmask (SIG_SETMASK, &savemask, NULL); + + return retval; } +CANCELLABLE_SYSCALL(int, pselect, (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, + const struct timespec *timeout, const sigset_t *sigmask), + (nfds, readfds, writefds, exceptfds, timeout, sigmask)) -#ifdef __UCLIBC_HAS_THREADS_NATIVE__ -int -pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, - const struct timespec *timeout, const sigset_t *sigmask) -{ - if (SINGLE_THREAD_P) - return __pselect (nfds, readfds, writefds, exceptfds, - timeout, sigmask); - - int oldtype = LIBC_CANCEL_ASYNC (); - - int result = __pselect (nfds, readfds, writefds, exceptfds, - timeout, sigmask); - - LIBC_CANCEL_RESET (oldtype); - - return result; -} #endif |