This program, based on one from the Apache 2 configure script, still causes
-current to lock up solid despite the recent bug fixes to the tcptw code.
Explicitly closing connected_s before returning from main() seems to avoid
the problem.
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
int main(void) {
int listen_s, connected_s, client_s;
int listen_port, rc;
struct sockaddr_in sa;
socklen_t sa_len;
socklen_t option_len;
int option;
listen_s = socket(AF_INET, SOCK_STREAM, 0);
if (listen_s < 0) {
perror("socket");
exit(1);
}
memset(&sa, 0, sizeof sa);
sa.sin_family = AF_INET;
/* leave port 0 to get ephemeral */
rc = bind(listen_s, (struct sockaddr *)&sa, sizeof sa);
if (rc < 0) {
perror("bind for ephemeral port");
exit(1);
}
/* find ephemeral port */
sa_len = sizeof(sa);
rc = getsockname(listen_s, (struct sockaddr *)&sa, &sa_len);
if (rc < 0) {
perror("getsockname");
exit(1);
}
listen_port = sa.sin_port;
rc = listen(listen_s, 5);
if (rc < 0) {
perror("listen");
exit(1);
}
client_s = socket(AF_INET, SOCK_STREAM, 0);
if (client_s < 0) {
perror("socket");
exit(1);
}
memset(&sa, 0, sizeof sa);
sa.sin_family = AF_INET;
sa.sin_port = listen_port;
/* leave sin_addr all zeros to use loopback */
rc = connect(client_s, (struct sockaddr *)&sa, sizeof sa);
if (rc < 0) {
perror("connect");
exit(1);
}
sa_len = sizeof sa;
connected_s = accept(listen_s, (struct sockaddr *)&sa, &sa_len);
if (connected_s < 0) {
perror("accept");
exit(1);
}
return 0;
}
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