?? mqnotifysig1.c
字號:
#include "unpipc.h"
mqd_t mqd;
void *buff;
struct mq_attr attr;
struct sigevent sigev;
static void sig_usr1(int);
int
main(int argc, char **argv)
{
if (argc != 2)
err_quit("usage: mqnotifysig1 <name>");
/* 4open queue, get attributes, allocate read buffer */
mqd = Mq_open(argv[1], O_RDONLY);
Mq_getattr(mqd, &attr);
buff = Malloc(attr.mq_msgsize);
/* 4establish signal handler, enable notification */
Signal(SIGUSR1, sig_usr1);
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGUSR1;
Mq_notify(mqd, &sigev);
for ( ; ; )
pause(); /* signal handler does everything */
exit(0);
}
static void
sig_usr1(int signo)
{
ssize_t n;
Mq_notify(mqd, &sigev); /* reregister first */
n = Mq_receive(mqd, buff, attr.mq_msgsize, NULL);
printf("SIGUSR1 received, read %ld bytes\n", (long) n);
return;
}
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