static void sig_usr1(int signo)
{
ssize_t n;
Mq_notify(mqd, &sigev);
n = Mq_receive(mqd, buff, attr.mq_msgsize, NULL);
printf("SIGUSR1 received, read %ld bytes\n", (long)n);
return;
}
/* $$.bp$$ */
int
main(int argc, char **argv)
{
int nfds;
char c;
fd_set rset;
mqd_t mqd;
void *buff;
ssize_t n;
struct mq_attr attr;
struct sigevent sigev;
if (argc != 2)
err_quit("usage: mqnotifysig5 <name>");
/* 4open queue, get attributes, allocate read buffer */
mqd = Mq_open(argv[1], O_RDONLY | O_NONBLOCK);
Mq_getattr(mqd, &attr);
buff = Malloc(attr.mq_msgsize);
Pipe(pipefd);
/* 4establish signal handler, enable notification */
Signal(SIGUSR1, sig_usr1);
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
FD_ZERO(&rset);
for ( ; ; ) {
FD_SET(pipefd[0], &rset);
nfds = Select(pipefd[0] + 1, &rset, NULL, NULL, NULL);
if (FD_ISSET(pipefd[0], &rset)) {
Read(pipefd[0], &c, 1);
Mq_notify(mqd, &sigev); /* reregister first */
while ( (n = mq_receive(mqd, buff, attr.mq_msgsize, NULL)) >= 0) {
printf("read %ld bytes\n", (long) n);
}
if (errno != EAGAIN)
err_sys("mq_receive error");
}
}
exit(0);
}
int main(int argc, char **argv)
{
mqd_t mqd;
void *buff;
ssize_t n;
sigset_t zeromask, newmask, oldmask;
struct mq_attr attr;
struct sigevent sigev;
if (argc != 2)
err_quit("Usage: nfs3 <name>");
mqd = Mq_open(argv[1], O_RDONLY | O_NONBLOCK);
Mq_getattr(mqd, &attr);
buff = (void *)Malloc(attr.mq_msgsize);
Sigemptyset(&zeromask);
Sigemptyset(&newmask);
Sigemptyset(&oldmask);
Sigaddset(&newmask, SIGUSR1);
Signal(SIGUSR1, sig_usr1);
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
for ( ; ; )
{
Sigprocmask(SIG_BLOCK, &newmask, &oldmask);
while (mqflag == 0)
sigsuspend(&zeromask);
mqflag = 0;
Mq_notify(mqd, &sigev);
while ((n = mq_receive(mqd, buff, attr.mq_msgsize, NULL)) >= 0)
{
printf("read %ld bytes\n", (long)n);
}
if (errno != EAGAIN)
err_sys("mq_receive error");
Sigprocmask(SIG_UNBLOCK, &newmask, NULL);
}
exit(0);
}
int
main(int argc, char **argv)
{
mqd_t mqd;
void *buff;
ssize_t n;
sigset_t zeromask, newmask, oldmask;
struct mq_attr attr;
struct sigevent sigev;
if (argc != 2)
err_quit("usage: mqnotifysig2 <name>");
/* 4open queue, get attributes, allocate read buffer */
mqd = Mq_open(argv[1], O_RDONLY);
Mq_getattr(mqd, &attr);
buff = Malloc(attr.mq_msgsize);
Sigemptyset(&zeromask); /* no signals blocked */
Sigemptyset(&newmask);
Sigemptyset(&oldmask);
Sigaddset(&newmask, SIGUSR1);
/* 4establish signal handler, enable notification */
Signal(SIGUSR1, sig_usr1);
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
for ( ; ; ) {
Sigprocmask(SIG_BLOCK, &newmask, &oldmask); /* block SIGUSR1 */
while (mqflag == 0)
sigsuspend(&zeromask);
mqflag = 0; /* reset flag */
Mq_notify(mqd, &sigev); /* reregister first */
n = Mq_receive(mqd, buff, attr.mq_msgsize, NULL);
printf("read %ld bytes\n", (long) n);
Sigprocmask(SIG_UNBLOCK, &newmask, NULL); /* unblock SIGUSR1 */
}
exit(0);
}
int
main(int argc, char **argv)
{
int signo;
mqd_t mqd;
void *buff;
ssize_t n;
sigset_t newmask;
struct mq_attr attr;
struct sigevent sigev;
if (argc != 2)
err_quit("usage: mqnotifysig4 <name>");
/* 4open queue, get attributes, allocate read buffer */
mqd = Mq_open(argv[1], O_RDONLY | O_NONBLOCK);
Mq_getattr(mqd, &attr);
buff = Malloc(attr.mq_msgsize);
Sigemptyset(&newmask);
Sigaddset(&newmask, SIGUSR1);
Sigprocmask(SIG_BLOCK, &newmask, NULL); /* block SIGUSR1 */
/* 4establish signal handler, enable notification */
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
for ( ; ; ) {
Sigwait(&newmask, &signo);
if (signo == SIGUSR1) {
Mq_notify(mqd, &sigev); /* reregister first */
while ( (n = mq_receive(mqd, buff, attr.mq_msgsize, NULL)) >= 0) {
printf("read %ld bytes\n", (long) n);
}
if (errno != EAGAIN)
err_sys("mq_receive error");
}
}
exit(0);
}
int main(int argc, char **argv)
{
if (argc != 2)
err_quit("Usage nft <name>");
mqd = Mq_open(argv[1], O_RDONLY | O_NONBLOCK);
Mq_getattr(mqd, &attr);
sigev.sigev_notify = SIGEV_THREAD;
sigev.sigev_value.sival_ptr = NULL;
sigev.sigev_notify_function = notify_thread;
sigev.sigev_notify_attributes = NULL;
Mq_notify(mqd, &sigev);
for ( ; ; )
pause();
exit(0);
}
static void notify_thread(union sigval arg)
{
ssize_t n;
void *buff;
printf("notify_thread started\n");
buff = (void *)Malloc(attr.mq_msgsize);
Mq_notify(mqd, &sigev);
while ((n = mq_receive(mqd, buff, attr.mq_msgsize, NULL)) >= 0)
printf("read %ld bytes\n", (long)n);
if (errno != EAGAIN)
err_sys("mq_receive error");
free(buff);
pthread_exit(NULL);
}
int main(int argc, char **argv)
{
if (argc != 2)
err_quit("Usage: nts1 <name>");
mqd = Mq_open(argv[1], O_RDONLY);
Mq_getattr(mqd, &attr);
buff = (void *)Malloc(attr.mq_msgsize);
Signal(SIGUSR1, sig_usr1);
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
for ( ; ; )
pause();
exit(0);
}
