os: replace select with poll

Select has limitations on the fd values it could accept and silently
breaks when it is reached.

1 files changed, 5 insertions, 10 deletions

diff --git a/libavformat/udp.c b/libavformat/udp.c
index 8080c98045..aa17c979f3 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -31,8 +31,8 @@
 #include "internal.h"
 #include "network.h"
 #include "os_support.h"
-#if HAVE_SYS_SELECT_H
-#include <sys/select.h>
+#if HAVE_POLL_H
+#include <poll.h>
 #endif
 #include <sys/time.h>
 
@@ -432,25 +432,20 @@ static int udp_open(URLContext *h, const char *uri, int flags)
 static int udp_read(URLContext *h, uint8_t *buf, int size)
 {
     UDPContext *s = h->priv_data;
+    struct pollfd p = {s->udp_fd, POLLIN, 0};
     int len;
-    fd_set rfds;
     int ret;
-    struct timeval tv;
 
     for(;;) {
         if (url_interrupt_cb())
             return AVERROR(EINTR);
-        FD_ZERO(&rfds);
-        FD_SET(s->udp_fd, &rfds);
-        tv.tv_sec = 0;
-        tv.tv_usec = 100 * 1000;
-        ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
+        ret = poll(&p, 1, 100);
         if (ret < 0) {
             if (ff_neterrno() == FF_NETERROR(EINTR))
                 continue;
             return AVERROR(EIO);
         }
-        if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
+        if (!(ret == 1 && p.revents & POLLIN))
             continue;
         len = recv(s->udp_fd, buf, size, 0);
         if (len < 0) {