https://tldp.org/HOWTO/TCP-Keepalive-HOWTO/programming.html#examples
/* --- begin of keepalive test program --- */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(void);
int main()
{
int s;
int optval;
socklen_t optlen = sizeof(optval);
/* Create the socket */
if((s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("socket()");
exit(EXIT_FAILURE);
}
/* Check the status for the keepalive option */
if(getsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &optval, &optlen) < 0) {
perror("getsockopt()");
close(s);
exit(EXIT_FAILURE);
}
printf("SO_KEEPALIVE is %s\n", (optval ? "ON" : "OFF"));
/* Set the option active */
optval = 1;
optlen = sizeof(optval);
if(setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen) < 0) {
perror("setsockopt()");
close(s);
exit(EXIT_FAILURE);
}
printf("SO_KEEPALIVE set on socket\n");
/* Check the status again */
if(getsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &optval, &optlen) < 0) {
perror("getsockopt()");
close(s);
exit(EXIT_FAILURE);
}
printf("SO_KEEPALIVE is %s\n", (optval ? "ON" : "OFF"));
close(s);
exit(EXIT_SUCCESS);
}
/* --- end of keepalive test program --- */
'programming/C_C++'에 해당되는 글 279건
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