| getsockopt(), setsockopt() | |
|---|---|
| get and set options on sockets | |
| #include 'sys/socket.h' #include 'sys/type.h' int getsockopt (int sockfd, int level, int optname, void *optval , socklen_t *optlen); int setsockopt ( int sockfd, int level, int optname, const void *optval , socklen_t optlen); |
getsockopt() and setsockopt() manipulate options for the socket referred to by the file descriptor sockfd. Options may exist at multiple protocol levels; they are always present at the uppermost socket level.
On success, 0 is returned, on error, -1 is returned, and errno is set approprately