Switch to a version of select that is closer to bsd's version.

freebsd-userspace/lib/libc_r/uthread/uthread_select.c

@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#include <unistd.h>
+#include <errno.h>
+#include <poll.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/fcntl.h>
+#include <pthread.h>
+#include "pthread_private.h"
+
+__weak_reference(__select, select);
+
+#ifdef __rtems__
+#include <freebsd/sys/timespec.h>
+#define realloc  _bsd_realloc
+#endif
+
+
+int 
+_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds,
+    struct timeval * timeout)
+{
+	struct pthread	*curthread = _get_curthread();
+	struct timespec ts;
+	int             i, ret = 0, f_wait = 1;
+	int		pfd_index, got_events = 0, fd_count = 0;
+	struct pthread_poll_data data;
+
+#ifndef __rtems__     /* XXX - NOT SURE WHAT TO DEFINE _thread_dtablesize TO. */
+	if (numfds > _thread_dtablesize) {
+		numfds = _thread_dtablesize;
+	}
+#endif
+	/* Count the number of file descriptors to be polled: */
+	if (readfds || writefds || exceptfds) {
+		for (i = 0; i < numfds; i++) {
+			if ((readfds && FD_ISSET(i, readfds)) ||
+			    (exceptfds && FD_ISSET(i, exceptfds)) ||
+			    (writefds && FD_ISSET(i, writefds))) {
+				fd_count++;
+			}
+		}
+	}
+
+	/*
+	 * Allocate memory for poll data if it hasn't already been
+	 * allocated or if previously allocated memory is insufficient.
+	 */
+	if ((curthread->poll_data.fds == NULL) ||
+	    (curthread->poll_data.nfds < fd_count)) {
+		data.fds = (struct pollfd *) realloc(curthread->poll_data.fds,
+		    sizeof(struct pollfd) * MAX(128, fd_count));
+		if (data.fds == NULL) {
+			errno = ENOMEM;
+			ret = -1;
+		}
+		else {
+			/*
+			 * Note that the threads poll data always
+			 * indicates what is allocated, not what is
+			 * currently being polled.
+			 */
+			curthread->poll_data.fds = data.fds;
+			curthread->poll_data.nfds = MAX(128, fd_count);
+		}
+	}
+	/* Check if a timeout was specified: */
+	if (timeout) {
+		if (timeout->tv_sec < 0 ||
+			timeout->tv_usec < 0 || timeout->tv_usec >= 1000000) {
+			errno = EINVAL;
+			return (-1);
+		}
+
+		/* Convert the timeval to a timespec: */
+		TIMEVAL_TO_TIMESPEC(timeout, &ts);
+
+		/* Set the wake up time: */
+		_thread_kern_set_timeout(&ts);
+		if (ts.tv_sec == 0 && ts.tv_nsec == 0)
+			f_wait = 0;
+	} else {
+		/* Wait for ever: */
+		_thread_kern_set_timeout(NULL);
+	}
+
+	if (ret == 0) {
+		/* Setup the wait data. */
+		data.fds = curthread->poll_data.fds;
+		data.nfds = fd_count;
+
+		/*
+		 * Setup the array of pollfds.  Optimize this by
+		  running the loop in reverse and stopping when
+		 * the number of selected file descriptors is reached.
+		 */
+		for (i = numfds - 1, pfd_index = fd_count - 1;
+		    (i >= 0) && (pfd_index >= 0); i--) {
+			data.fds[pfd_index].events = 0;
+			if (readfds && FD_ISSET(i, readfds)) {
+				data.fds[pfd_index].events = POLLRDNORM;
+			}
+			if (exceptfds && FD_ISSET(i, exceptfds)) {
+				data.fds[pfd_index].events |= POLLRDBAND;
+			}
+			if (writefds && FD_ISSET(i, writefds)) {
+				data.fds[pfd_index].events |= POLLWRNORM;
+			}
+			if (data.fds[pfd_index].events != 0) {
+				/*
+				 * Set the file descriptor to be polled and
+				 * clear revents in case of a timeout which
+				 * leaves fds unchanged:
+				 */
+				data.fds[pfd_index].fd = i;
+				data.fds[pfd_index].revents = 0;
+				pfd_index--;
+			}
+		}
+		if (((ret = __sys_poll(data.fds, data.nfds, 0)) == 0) &&
+		   (f_wait != 0)) {
+			curthread->data.poll_data = &data;
+			curthread->interrupted = 0;
+			_thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__);
+			if (curthread->interrupted) {
+				errno = EINTR;
+				data.nfds = 0;
+				ret = -1;
+			} else
+				ret = data.nfds;
+		}
+	}
+
+	if (ret >= 0) {
+		numfds = 0;
+		for (i = 0; i < fd_count; i++) {
+			/*
+			 * Check the results of the poll and clear
+			 * this file descriptor from the fdset if
+			 * the requested event wasn't ready.
+			 */
+
+			/*
+			 * First check for invalid descriptor.
+			 * If found, set errno and return -1.
+			 */
+			if (data.fds[i].revents & POLLNVAL) {
+				errno = EBADF;
+				return -1;
+			}
+
+			got_events = 0;
+			if (readfds != NULL) {
+				if (FD_ISSET(data.fds[i].fd, readfds)) {
+					if ((data.fds[i].revents & (POLLIN
+					    | POLLRDNORM | POLLERR
+					    | POLLHUP | POLLNVAL)) != 0)
+						got_events++;
+					else
+						FD_CLR(data.fds[i].fd, readfds);
+				}
+			}
+			if (writefds != NULL) {
+				if (FD_ISSET(data.fds[i].fd, writefds)) {
+					if ((data.fds[i].revents & (POLLOUT
+					    | POLLWRNORM | POLLWRBAND | POLLERR
+					    | POLLHUP | POLLNVAL)) != 0)
+						got_events++;
+					else
+						FD_CLR(data.fds[i].fd,
+						    writefds);
+				}
+			}
+			if (exceptfds != NULL) {
+				if (FD_ISSET(data.fds[i].fd, exceptfds)) {
+					if (data.fds[i].revents & (POLLRDBAND |
+					    POLLPRI))
+						got_events++;
+					else
+						FD_CLR(data.fds[i].fd,
+						    exceptfds);
+				}
+			}
+			if (got_events != 0)
+				numfds+=got_events;
+		}
+		ret = numfds;
+	}
+
+	return (ret);
+}
+
+int 
+__select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+	struct timeval *timeout)
+{
+	int ret;
+
+#ifndef __rtems__
+	_thread_enter_cancellation_point();
+#endif
+	ret = _select(numfds, readfds, writefds, exceptfds, timeout);
+#ifndef __rtems__
+	_thread_leave_cancellation_point();
+#endif
+
+	return ret;
+}