/*
* UNIX socketpair() implementation. Why? Because Windows does not have it.
* Return 0 on success, -1 on error.
*/
static int
my_socketpair(struct conn *c, int sp[2])
{
struct sockaddr_in sa;
int sock, ret = -1;
socklen_t len = sizeof(sa);
(void) memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(0);
sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
elog(E_LOG, c, "mysocketpair: socket(): %d", ERRNO);
} else if (bind(sock, (struct sockaddr *) &sa, len) != 0) {
elog(E_LOG, c, "mysocketpair: bind(): %d", ERRNO);
(void) closesocket(sock);
} else if (listen(sock, 1) != 0) {
elog(E_LOG, c, "mysocketpair: listen(): %d", ERRNO);
(void) closesocket(sock);
} else if (getsockname(sock, (struct sockaddr *) &sa, &len) != 0) {
elog(E_LOG, c, "mysocketpair: getsockname(): %d", ERRNO);
(void) closesocket(sock);
} else if ((sp[0] = socket(AF_INET, SOCK_STREAM, 6)) == -1) {
elog(E_LOG, c, "mysocketpair: socket(): %d", ERRNO);
(void) closesocket(sock);
} else if (connect(sp[0], (struct sockaddr *) &sa, len) != 0) {
elog(E_LOG, c, "mysocketpair: connect(): %d", ERRNO);
(void) closesocket(sock);
(void) closesocket(sp[0]);
} else if ((sp[1] = accept(sock,(struct sockaddr *) &sa, &len)) == -1) {
elog(E_LOG, c, "mysocketpair: accept(): %d", ERRNO);
(void) closesocket(sock);
(void) closesocket(sp[0]);
} else {
/* Success */
ret = 0;
(void) closesocket(sock);
(void) set_non_blocking_mode(sp[0]);
(void) set_non_blocking_mode(sp[1]);
}
#ifndef _WIN32
(void) fcntl(sp[0], F_SETFD, FD_CLOEXEC);
(void) fcntl(sp[1], F_SETFD, FD_CLOEXEC);
#endif /* _WIN32*/
return (ret);
}
static void close_socket_gracefully(SOCKET sock) {
char buf[BUFSIZ];
int n;
// Send FIN to the client
(void) shutdown(sock, SHUT_WR);
set_non_blocking_mode(sock);
// Read and discard pending data. If we do not do that and close the
// socket, the data in the send buffer may be discarded. This
// behaviour is seen on Windows, when client keeps sending data
// when server decide to close the connection; then when client
// does recv() it gets no data back.
do {
n = pull(sock, buf, sizeof(buf));
} while (n > 0);
// Now we know that our FIN is ACK-ed, safe to close
(void) close(sock);
}