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#include <fcntl.h> /* For O_* constants */
#include <sys/stat.h> /* For mode constants */
#include <sys/types.h>
#include <sys/wait.h>
#include <mqueue.h>
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv) {
int pid;
char *fname;
if (argc != 2) {
fprintf(stderr, "wrong number of arguments: %d\n", argc);
return 1;
} else if (argv[1][0] != '/') {
fprintf(stderr, "name must starts with '/': %c\n", argv[1][0]);
return 1;
}
fname = argv[1];
mqd_t t = mq_open(fname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR, NULL);
;
if (t == -1) {
perror("mq_open");
return 1;
}
pid = fork();
if (pid == 0)
pause();
else if (pid > 0) {
printf("%d %d %d\n", getpid(), pid, t);
fflush(stdout);
wait(NULL);
mq_unlink(fname);
} else {
perror("fork");
return 1;
}
return 0;
}
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