c - UDP -- Socket - bind error - Address already in use? -


i see address in use on bind() while system starting up.

when reload system plenty of times, see once in while 1 out of 100, see following error:

bind failed.error: address in use.

on every reboot of system - closing socket using close(gtx.i4txsockid).

here code, not sure on how can debug this.

i have added netstat -ap find out problem it.

on success, see: 

 netstat: /proc/net/tcp6: no such file or directory udp        0      0 0.0.0.0:syslog          0.0.0.0:*                           1562/syslog-ng udp        0      0 0.0.0.0:49155           0.0.0.0:*                           1817/app.exe

on failure, see:

 netstat: /proc/net/tcp6: no such file or directory udp        0      0 0.0.0.0:45825           0.0.0.0:*                           1816/app.exe udp        0      0 0.0.0.0:syslog          0.0.0.0:*                           1562/syslog-ng udp        0      0 localhost:49155         0.0.0.0:*                           1816/app.exe

i have added following line:

if (setsockopt(gtx.i4txsockid, sol_socket, so_reuseaddr, &(int){ 1 }, sizeof(int)) < 0) {     perror("failed in so_reuseaddr");     return; }

this not making difference.

i using embedded linux - version - 3.8.8

struct sockaddr_in  localaddr;  gtx.i4txsockid = socket (af_inet, sock_dgram, ipproto_udp);  if (gtx.i4txsockid < 0) {     printf("error in opening socket");     return ; }  if (setsockopt(gtx.i4txsockid, sol_socket, so_reuseaddr, &(int){ 1 }, sizeof(int)) < 0) {     perror("failed in so_reuseaddr");     return; }  localaddr.sin_family = af_inet; localaddr.sin_addr.s_addr = inaddr_any; localaddr.sin_port = htons(49155);  /* bind socket */ if (bind (gtx.i4txsockid, (struct sockaddr *) &localaddr, sizeof (struct sockaddr_in)) < 0) {     /* failure in binding udp socket */     perror("bind failed.error");     return; }

i got know can reserve port in rcs file - 

sysctl -w net.ipv4.ip_local_reserved_ports=49155

-

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