1 #include <assert.h> 2 #include <stddef.h> 3 #include <string.h> 4 #include <signal.h> 5 #include <unistd.h> 6 #include <sys/wait.h> 7 #include <sys/socket.h> 8 #include <sys/un.h> 9 10 static void 11 handler(int sig) 12 { 13 assert(close(1) == 0); 14 _exit(0); 15 } 16 17 int 18 main(int ac, const char **av) 19 { 20 struct sockaddr_un addr = { 21 .sun_family = AF_UNIX, 22 }; 23 socklen_t len; 24 25 assert(ac == 2); 26 assert(strlen(av[1]) > 0); 27 28 strncpy(addr.sun_path, av[1], sizeof(addr.sun_path)); 29 len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1; 30 if (len > sizeof(addr)) 31 len = sizeof(addr); 32 33 unlink(av[1]); 34 close(0); 35 close(1); 36 37 assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0); 38 assert(bind(0, (struct sockaddr *) &addr, len) == 0); 39 assert(listen(0, 5) == 0); 40 41 memset(&addr, 0, sizeof addr); 42 assert(getsockname(0, (struct sockaddr *) &addr, &len) == 0); 43 if (len > sizeof(addr)) 44 len = sizeof(addr); 45 46 pid_t pid = fork(); 47 assert(pid >= 0); 48 49 if (pid) { 50 assert(accept(0, (struct sockaddr *) &addr, &len) == 1); 51 assert(close(0) == 0); 52 assert(kill(pid, SIGUSR1) == 0); 53 int status; 54 assert(waitpid(pid, &status, 0) == pid); 55 assert(status == 0); 56 assert(close(1) == 0); 57 } else { 58 sigset_t set; 59 sigemptyset(&set); 60 sigaddset(&set, SIGUSR1); 61 62 assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0); 63 assert(signal(SIGUSR1, handler) != SIG_ERR); 64 assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 1); 65 assert(close(0) == 0); 66 assert(connect(1, (struct sockaddr *) &addr, len) == 0); 67 assert(sigprocmask(SIG_UNBLOCK, &set, NULL) == 0); 68 assert(pause() == 99); 69 return 1; 70 } 71 72 unlink(av[1]); 73 return 0; 74 } 75
