1 files changed, 115 insertions, 0 deletions
diff --git a/openbsd-compat/bsd-poll.c b/openbsd-compat/bsd-poll.c
new file mode 100644
index 0000000..967f947
--- /dev/null
+++ b/openbsd-compat/bsd-poll.c
@@ -0,0 +1,115 @@
+/*
+ * 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_PPOLL) || !defined(HAVE_POLL) || defined(BROKEN_POLL)
+
+#include <sys/types.h>
+#include <sys/time.h>
+#ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "bsd-poll.h"
+
+#if !defined(HAVE_PPOLL) || defined(BROKEN_POLL)
+/*
+ * A minimal implementation of ppoll(2), built on top of pselect(2).
+ *
+ * Only supports POLLIN, POLLOUT and POLLPRI flags in pfd.events and
+ * revents. Notably POLLERR, POLLHUP and POLLNVAL are not supported.
+ *
+ * Supports pfd.fd = -1 meaning "unused" although it's not standard.
+ */
+
+int
+ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *tmoutp,
+    const sigset_t *sigmask)
+{
+	nfds_t i;
+	int ret, fd, maxfd = 0;
+	fd_set readfds, writefds, exceptfds;
+
+	for (i = 0; i < nfds; i++) {
+		fd = fds[i].fd;
+		if (fd != -1 && fd >= FD_SETSIZE) {
+			errno = EINVAL;
+			return -1;
+		}
+		maxfd = MAX(maxfd, fd);
+	}
+
+	/* populate event bit vectors for the events we're interested in */
+	FD_ZERO(&readfds);
+	FD_ZERO(&writefds);
+	FD_ZERO(&exceptfds);
+	for (i = 0; i < nfds; i++) {
+		fd = fds[i].fd;
+		if (fd == -1)
+			continue;
+		if (fds[i].events & POLLIN)
+			FD_SET(fd, &readfds);
+		if (fds[i].events & POLLOUT)
+			FD_SET(fd, &writefds);
+		if (fds[i].events & POLLPRI)
+			FD_SET(fd, &exceptfds);
+	}
+
+	ret = pselect(maxfd + 1, &readfds, &writefds, &exceptfds, tmoutp, sigmask);
+
+	/* 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 ((fds[i].events & POLLIN) && FD_ISSET(fd, &readfds))
+			fds[i].revents |= POLLIN;
+		if ((fds[i].events & POLLOUT) && FD_ISSET(fd, &writefds))
+			fds[i].revents |= POLLOUT;
+		if ((fds[i].events & POLLPRI) && FD_ISSET(fd, &exceptfds))
+			fds[i].revents |= POLLPRI;
+	}
+
+	return ret;
+}
+#endif /* !HAVE_PPOLL || BROKEN_POLL */
+
+#if !defined(HAVE_POLL) || defined(BROKEN_POLL)
+int
+poll(struct pollfd *fds, nfds_t nfds, int timeout)
+{
+	struct timespec ts, *tsp = NULL;
+
+	/* poll timeout is msec, ppoll is timespec (sec + nsec) */
+	if (timeout >= 0) {
+		ts.tv_sec = timeout / 1000;
+		ts.tv_nsec = (timeout % 1000) * 1000000;
+		tsp = &ts;
+	}
+
+	return ppoll(fds, nfds, tsp, NULL);
+}
+#endif /* !HAVE_POLL || BROKEN_POLL */
+
+#endif /* !HAVE_PPOLL || !HAVE_POLL || BROKEN_POLL */