diff options
Diffstat (limited to 'sysdeps/unix/bsd/poll.c')
| -rw-r--r-- | sysdeps/unix/bsd/poll.c | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/sysdeps/unix/bsd/poll.c b/sysdeps/unix/bsd/poll.c deleted file mode 100644 index b6d306ce1d..0000000000 --- a/sysdeps/unix/bsd/poll.c +++ /dev/null @@ -1,197 +0,0 @@ -/* Copyright (C) 1994-2013 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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, see - <http://www.gnu.org/licenses/>. */ - -#include <alloca.h> -#include <sys/poll.h> -#include <sys/types.h> -#include <errno.h> -#include <string.h> -#include <sys/time.h> -#include <sys/param.h> -#include <unistd.h> - -/* Poll the file descriptors described by the NFDS structures starting at - FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for - an event to occur; if TIMEOUT is -1, block until an event occurs. - Returns the number of file descriptors with events, zero if timed out, - or -1 for errors. */ - -int -__poll (fds, nfds, timeout) - struct pollfd *fds; - nfds_t nfds; - int timeout; -{ - static int max_fd_size; - struct timeval tv; - fd_set *rset, *wset, *xset; - struct pollfd *f; - int ready; - int maxfd = 0; - int bytes; - - if (!max_fd_size) - max_fd_size = __getdtablesize (); - - bytes = howmany (max_fd_size, __NFDBITS); - rset = alloca (bytes); - wset = alloca (bytes); - xset = alloca (bytes); - - /* We can't call FD_ZERO, since FD_ZERO only works with sets - of exactly __FD_SETSIZE size. */ - __bzero (rset, bytes); - __bzero (wset, bytes); - __bzero (xset, bytes); - - for (f = fds; f < &fds[nfds]; ++f) - { - f->revents = 0; - if (f->fd >= 0) - { - if (f->fd >= max_fd_size) - { - /* The user provides a file descriptor number which is higher - than the maximum we got from the `getdtablesize' call. - Maybe this is ok so enlarge the arrays. */ - fd_set *nrset, *nwset, *nxset; - int nbytes; - - max_fd_size = roundup (f->fd, __NFDBITS); - nbytes = howmany (max_fd_size, __NFDBITS); - - nrset = alloca (nbytes); - nwset = alloca (nbytes); - nxset = alloca (nbytes); - - __bzero ((char *) nrset + bytes, nbytes - bytes); - __bzero ((char *) nwset + bytes, nbytes - bytes); - __bzero ((char *) nxset + bytes, nbytes - bytes); - - rset = memcpy (nrset, rset, bytes); - wset = memcpy (nwset, wset, bytes); - xset = memcpy (nxset, xset, bytes); - - bytes = nbytes; - } - - if (f->events & POLLIN) - FD_SET (f->fd, rset); - if (f->events & POLLOUT) - FD_SET (f->fd, wset); - if (f->events & POLLPRI) - FD_SET (f->fd, xset); - if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI))) - maxfd = f->fd; - } - } - - tv.tv_sec = timeout / 1000; - tv.tv_usec = (timeout % 1000) * 1000; - - while (1) - { - ready = __select (maxfd + 1, rset, wset, xset, - timeout == -1 ? NULL : &tv); - - /* It might be that one or more of the file descriptors is invalid. - We now try to find and mark them and then try again. */ - if (ready == -1 && errno == EBADF) - { - fd_set *sngl_rset = alloca (bytes); - fd_set *sngl_wset = alloca (bytes); - fd_set *sngl_xset = alloca (bytes); - struct timeval sngl_tv; - - /* Clear the original set. */ - __bzero (rset, bytes); - __bzero (wset, bytes); - __bzero (xset, bytes); - - /* This means we don't wait for input. */ - sngl_tv.tv_sec = 0; - sngl_tv.tv_usec = 0; - - maxfd = -1; - - /* Reset the return value. */ - ready = 0; - - for (f = fds; f < &fds[nfds]; ++f) - if (f->fd != -1 && (f->events & (POLLIN|POLLOUT|POLLPRI)) - && (f->revents & POLLNVAL) == 0) - { - int n; - - __bzero (sngl_rset, bytes); - __bzero (sngl_wset, bytes); - __bzero (sngl_xset, bytes); - - if (f->events & POLLIN) - FD_SET (f->fd, sngl_rset); - if (f->events & POLLOUT) - FD_SET (f->fd, sngl_wset); - if (f->events & POLLPRI) - FD_SET (f->fd, sngl_xset); - - n = __select (f->fd + 1, sngl_rset, sngl_wset, sngl_xset, - &sngl_tv); - if (n != -1) - { - /* This descriptor is ok. */ - if (f->events & POLLIN) - FD_SET (f->fd, rset); - if (f->events & POLLOUT) - FD_SET (f->fd, wset); - if (f->events & POLLPRI) - FD_SET (f->fd, xset); - if (f->fd > maxfd) - maxfd = f->fd; - if (n > 0) - /* Count it as being available. */ - ++ready; - } - else if (errno == EBADF) - f->revents |= POLLNVAL; - } - /* Try again. */ - continue; - } - - break; - } - - if (ready > 0) - for (f = fds; f < &fds[nfds]; ++f) - { - if (f->fd >= 0) - { - if (FD_ISSET (f->fd, rset)) - f->revents |= POLLIN; - if (FD_ISSET (f->fd, wset)) - f->revents |= POLLOUT; - if (FD_ISSET (f->fd, xset)) - f->revents |= POLLPRI; - } - } - - return ready; -} -#ifndef __poll -libc_hidden_def (__poll) -weak_alias (__poll, poll) -#endif |