>>797
普通に動くが。
　cl -DADDR=0 -DPORT=12345 a.c -Feserver.exe wsock32.lib
　cl -DADDR=0x7f000001 -DPORT=12345 a.c -Feclient.exe wsock32.lib
　cl a.c -Fechild.exe wsock32.lib
#include <winsock.h>
int main(int ac, char **av) {
　SOCKET s, c; char buf[128]; struct sockaddr_in sin;
　PROCESS_INFORMATION pi; STARTUPINFO si = {sizeof si};
　WSADATA data; WSAStartup(MAKEWORD(1, 1), &data);
#ifdef PORT
　s = socket(PF_INET, SOCK_STREAM, 0);
　sin.sin_family = AF_INET; sin.sin_port = PORT;
　sin.sin_addr.s_addr = htonl(ADDR);
#if !ADDR
　bind(s, (struct sockaddr *)&sin, sizeof sin);
　listen(s, 1);
　c = accept(s, NULL, NULL);
　recv(c, buf, 4, 0); printf("server: %.4s\n", buf);
　sprintf(buf, "child %d", c);
　CreateProcess(NULL, buf, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi);
　WaitForSingleObject(pi.hProcess, INFINITE);
#else /* ADDR */
　connect(s, (struct sockaddr *)&sin, sizeof sin);
　send(s, "0123456789", 10, 0);
#endif /* ADDR */
#else /* !PORT */
　recv((SOCKET)atoi(av[1]), buf, 6, 0); printf("child: %.6s\n", buf);
#endif /* !PORT */
　closesocket(s); return 0;
}