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-rw-r--r--openbsd-compat/bsd-poll.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/openbsd-compat/bsd-poll.c b/openbsd-compat/bsd-poll.c
new file mode 100644
index 0000000..c8e6222
--- /dev/null
+++ b/openbsd-compat/bsd-poll.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2004, 2005, 2007 Darren Tucker (dtucker at zip com au).
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "includes.h"
+#if !defined(HAVE_POLL)
+
+#include <sys/types.h>
+#include <sys/time.h>
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "bsd-poll.h"
+
+/*
+ * A minimal implementation of poll(2), built on top of select(2).
+ *
+ * Only supports POLLIN and POLLOUT flags in pfd.events, and POLLIN, POLLOUT
+ * and POLLERR flags in revents.
+ *
+ * Supports pfd.fd = -1 meaning "unused" although it's not standard.
+ */
+
+int
+poll(struct pollfd *fds, nfds_t nfds, int timeout)
+{
+ nfds_t i;
+ int saved_errno, ret, fd, maxfd = 0;
+ fd_set *readfds = NULL, *writefds = NULL, *exceptfds = NULL;
+ size_t nmemb;
+ struct timeval tv, *tvp = NULL;
+
+ for (i = 0; i < nfds; i++) {
+ fd = fds[i].fd;
+ if (fd >= FD_SETSIZE) {
+ errno = EINVAL;
+ return -1;
+ }
+ maxfd = MAX(maxfd, fd);
+ }
+
+ nmemb = howmany(maxfd + 1 , NFDBITS);
+ if ((readfds = calloc(nmemb, sizeof(fd_mask))) == NULL ||
+ (writefds = calloc(nmemb, sizeof(fd_mask))) == NULL ||
+ (exceptfds = calloc(nmemb, sizeof(fd_mask))) == NULL) {
+ saved_errno = ENOMEM;
+ ret = -1;
+ goto out;
+ }
+
+ /* populate event bit vectors for the events we're interested in */
+ for (i = 0; i < nfds; i++) {
+ fd = fds[i].fd;
+ if (fd == -1)
+ continue;
+ if (fds[i].events & POLLIN) {
+ FD_SET(fd, readfds);
+ FD_SET(fd, exceptfds);
+ }
+ if (fds[i].events & POLLOUT) {
+ FD_SET(fd, writefds);
+ FD_SET(fd, exceptfds);
+ }
+ }
+
+ /* poll timeout is msec, select is timeval (sec + usec) */
+ if (timeout >= 0) {
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000) * 1000;
+ tvp = &tv;
+ }
+
+ ret = select(maxfd + 1, readfds, writefds, exceptfds, tvp);
+ saved_errno = errno;
+
+ /* scan through select results and set poll() flags */
+ for (i = 0; i < nfds; i++) {
+ fd = fds[i].fd;
+ fds[i].revents = 0;
+ if (fd == -1)
+ continue;
+ if (FD_ISSET(fd, readfds)) {
+ fds[i].revents |= POLLIN;
+ }
+ if (FD_ISSET(fd, writefds)) {
+ fds[i].revents |= POLLOUT;
+ }
+ if (FD_ISSET(fd, exceptfds)) {
+ fds[i].revents |= POLLERR;
+ }
+ }
+
+out:
+ free(readfds);
+ free(writefds);
+ free(exceptfds);
+ if (ret == -1)
+ errno = saved_errno;
+ return ret;
+}
+#endif