I made a trivial change today to the Simple Socket Server example that comes with the altera software. I changed the SOCK_STREAM to SOCK_DGRAM. Now the listen() fails for some reason, but errno is 0?? Code and output are below.
if ((fd_listen = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Socket creation failed");
}
addr.sin_family = AF_INET;
addr.sin_port = htons(30);
addr.sin_addr.s_addr = INADDR_ANY;
if ((bind(fd_listen,(struct sockaddr *)&addr,sizeof(addr))) < 0)
{
alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Bind failed");
}
if ((listen(fd_listen,1)) < 0)
{
printf("errno = %d\n", errno);
alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Listen failed");
}
Created "Nios II Simple Socket Server" task (Prio: 10)
errno = 0
[Network]: See STDERR for expanded diagnosis translation.
[Network]: [SSS_task] Listen failed
[Network]: ERRNO: :
[Network]: See STDERR (FAULT_LEVEL is SYSTEM).
[Network]: FAULT_LEVEL is SYSTEM.
[Network]: FATAL Error, Restart required.
[Network]: Locking scheduler - endless loop.
No free buffers for rx
No free buffers for rx
