1 /* $FreeBSD$ */ 2 3 #include <err.h> 4 #include <errno.h> 5 #include <fcntl.h> 6 #include <mqueue.h> 7 #include <signal.h> 8 #include <stdio.h> 9 10 #define MQNAME "/mytstqueue1" 11 12 int 13 main(void) 14 { 15 struct mq_attr attr, attr2; 16 struct sigevent sigev; 17 mqd_t mq; 18 int status; 19 20 attr.mq_maxmsg = 2; 21 attr.mq_msgsize = 100; 22 mq = mq_open(MQNAME, O_CREAT | O_RDWR | O_EXCL, 0666, &attr); 23 if (mq == (mqd_t)-1) 24 err(1, "mq_open"); 25 status = mq_unlink(MQNAME); 26 if (status) 27 err(1, "mq_unlink"); 28 status = mq_getattr(mq, &attr2); 29 if (status) 30 err(1, "mq_getattr"); 31 if (attr.mq_maxmsg != attr2.mq_maxmsg) 32 err(1, "mq_maxmsg changed"); 33 if (attr.mq_msgsize != attr2.mq_msgsize) 34 err(1, "mq_msgsize changed"); 35 36 sigev.sigev_notify = SIGEV_SIGNAL; 37 sigev.sigev_signo = SIGRTMIN; 38 status = mq_notify(mq, &sigev); 39 if (status) 40 err(1, "mq_notify"); 41 status = mq_notify(mq, &sigev); 42 if (status == 0) 43 err(1, "mq_notify 2"); 44 else if (errno != EBUSY) 45 err(1, "mq_notify 3"); 46 status = mq_notify(mq, NULL); 47 if (status) 48 err(1, "mq_notify 4"); 49 status = mq_close(mq); 50 if (status) 51 err(1, "mq_close"); 52 return (0); 53 } 54