On Wed, 26 Jan 2022, Brad Smith wrote:
On Wed, Jan 12, 2022 at 12:13:14AM -0500, Brad Smith wrote:
Fix setsockopt() usage on OpenBSD with IP_MULTICAST_TTL. The field
type should be an unsigned char on anything but Linux.
Based on feedback so far. Here is a much simpler approach to this issue..
Win32 needs DWORD unfortunately. I missed it earlier, sorry.
https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
Regards,
Marton
diff --git a/libavformat/udp.c b/libavformat/udp.c
index 83c042d079..da1b98890b 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -164,7 +164,9 @@ static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
{
#ifdef IP_MULTICAST_TTL
if (addr->sa_family == AF_INET) {
- if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL,
sizeof(mcastTTL)) < 0) {
+ unsigned char ttl = mcastTTL; /* ignore the outdated Linux
documentation */
+
+ if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl))
< 0) {
ff_log_net_error(logctx, AV_LOG_ERROR,
"setsockopt(IP_MULTICAST_TTL)");
return ff_neterrno();
}
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