1 /* $FreeBSD$ */ 2 3 #include <sys/types.h> 4 #include <sys/select.h> 5 #include <sys/wait.h> 6 #include <err.h> 7 #include <fcntl.h> 8 #include <mqueue.h> 9 #include <signal.h> 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include <unistd.h> 13 14 #define MQNAME "/mytstqueue3" 15 #define LOOPS 1000 16 #define PRIO 10 17 18 static void 19 sighandler(int sig __unused) 20 { 21 write(1, "timeout\n", 8); 22 _exit(1); 23 } 24 25 int 26 main(void) 27 { 28 fd_set set; 29 struct mq_attr attr; 30 int status; 31 mqd_t mq; 32 pid_t pid; 33 34 mq_unlink(MQNAME); 35 36 attr.mq_maxmsg = 5; 37 attr.mq_msgsize = 128; 38 mq = mq_open(MQNAME, O_CREAT | O_RDWR | O_EXCL, 0666, &attr); 39 if (mq == (mqd_t)-1) 40 err(1, "mq_open()"); 41 status = mq_getattr(mq, &attr); 42 if (status) 43 err(1, "mq_getattr()"); 44 45 pid = fork(); 46 if (pid == 0) { /* child */ 47 char *buf; 48 int j, i; 49 unsigned int prio; 50 51 mq_close(mq); 52 53 signal(SIGALRM, sighandler); 54 55 mq = mq_open(MQNAME, O_RDWR); 56 if (mq == (mqd_t)-1) 57 err(1, "child process: mq_open"); 58 buf = malloc(attr.mq_msgsize); 59 for (j = 0; j < LOOPS; ++j) { 60 FD_ZERO(&set); 61 FD_SET(__mq_oshandle(mq), &set); 62 alarm(3); 63 status = select(__mq_oshandle(mq)+1, &set, NULL, NULL, NULL); 64 if (status != 1) 65 err(1, "child process: select()"); 66 status = mq_receive(mq, buf, attr.mq_msgsize, &prio); 67 if (status == -1) 68 err(2, "child process: mq_receive"); 69 for (i = 0; i < attr.mq_msgsize; ++i) 70 if (buf[i] != i) 71 err(3, "message data corrupted"); 72 if (prio != PRIO) 73 err(4, "priority is incorrect: %d", prio); 74 } 75 alarm(0); 76 free(buf); 77 mq_close(mq); 78 return (0); 79 } else if (pid == -1) { 80 err(1, "fork()"); 81 } else { 82 char *buf; 83 int i, j; 84 85 signal(SIGALRM, sighandler); 86 buf = malloc(attr.mq_msgsize); 87 for (j = 0; j < LOOPS; ++j) { 88 for (i = 0; i < attr.mq_msgsize; ++i) { 89 buf[i] = i; 90 } 91 alarm(3); 92 FD_ZERO(&set); 93 FD_SET(__mq_oshandle(mq), &set); 94 status = select(__mq_oshandle(mq)+1, NULL, &set, NULL, NULL); 95 if (status != 1) 96 err(1, "select()"); 97 status = mq_send(mq, buf, attr.mq_msgsize, PRIO); 98 if (status) { 99 kill(pid, SIGKILL); 100 err(2, "mq_send()"); 101 } 102 } 103 alarm(3); 104 wait(&status); 105 alarm(0); 106 } 107 status = mq_close(mq); 108 if (status) 109 err(1, "mq_close"); 110 mq_unlink(MQNAME); 111 return (0); 112 } 113