/* Copyright (C) 1996-1998,2001,2002,2003,2006 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free 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 libc_hidden_proto(sigprocmask) libc_hidden_proto(select) /* 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) { 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; } #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