147b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <assert.h> 256ef5ef90f23e1875247b1ee2b74549845c3eb63Dmitry V. Levin#include <stddef.h> 347b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <string.h> 4da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin#include <signal.h> 547b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <unistd.h> 647b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <sys/wait.h> 747b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <sys/socket.h> 847b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin#include <sys/un.h> 947b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 10da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levinstatic void 11da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levinhandler(int sig) 12da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin{ 13da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(close(1) == 0); 14da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin _exit(0); 15da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin} 16da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin 17da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levinint 18da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levinmain(int ac, const char **av) 1947b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin{ 2047b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin struct sockaddr_un addr = { 2147b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin .sun_family = AF_UNIX, 2247b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin }; 23c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin socklen_t len; 2447b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 25c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin assert(ac == 2); 26c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin assert(strlen(av[1]) > 0); 27c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin 28c9e241882739c2b41fd33c85e2d387fe05a5f7ccDmitry V. Levin strncpy(addr.sun_path, av[1], sizeof(addr.sun_path)); 29c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1; 30c9e241882739c2b41fd33c85e2d387fe05a5f7ccDmitry V. Levin if (len > sizeof(addr)) 31c9e241882739c2b41fd33c85e2d387fe05a5f7ccDmitry V. Levin len = sizeof(addr); 32c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin 33c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin unlink(av[1]); 3447b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin close(0); 3547b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin close(1); 3647b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 3747b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0); 3847b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(bind(0, (struct sockaddr *) &addr, len) == 0); 3947b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(listen(0, 5) == 0); 4047b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 4147b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin memset(&addr, 0, sizeof addr); 4247b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(getsockname(0, (struct sockaddr *) &addr, &len) == 0); 43c9e241882739c2b41fd33c85e2d387fe05a5f7ccDmitry V. Levin if (len > sizeof(addr)) 44c9e241882739c2b41fd33c85e2d387fe05a5f7ccDmitry V. Levin len = sizeof(addr); 4547b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 4647b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin pid_t pid = fork(); 4747b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(pid >= 0); 4847b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 4947b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin if (pid) { 5047b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(accept(0, (struct sockaddr *) &addr, &len) == 1); 5147b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(close(0) == 0); 52da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(kill(pid, SIGUSR1) == 0); 5347b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin int status; 5447b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(waitpid(pid, &status, 0) == pid); 5547b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(status == 0); 5647b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(close(1) == 0); 5747b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin } else { 58da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin sigset_t set; 59da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin sigemptyset(&set); 60da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin sigaddset(&set, SIGUSR1); 61da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin 62da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0); 63da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(signal(SIGUSR1, handler) != SIG_ERR); 6447b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 1); 6547b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin assert(close(0) == 0); 6656ef5ef90f23e1875247b1ee2b74549845c3eb63Dmitry V. Levin assert(connect(1, (struct sockaddr *) &addr, len) == 0); 67da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(sigprocmask(SIG_UNBLOCK, &set, NULL) == 0); 68da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin assert(pause() == 99); 69da66e25779635e59b42a4477ef1e8b6b6917dac6Dmitry V. Levin return 1; 7047b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin } 7147b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin 72c9cc4cbc50acb47f5042cbba011c4d81114eabcaDmitry V. Levin unlink(av[1]); 7347b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin return 0; 7447b0dcca2b5ccb7e64a9de42d5d9d562e650bf17Dmitry V. Levin} 75