int main(int argc, char **argv)
{
int c, flags;
sem_t *sem;
unsigned int value;
flags = O_RDWR | O_CREAT;
value = 1;
while ((c = Getopt(argc, argv, "ei:")) != -1)
{
switch (c)
{
case 'e':
flags |= O_EXCL;
break;
case 'i':
value = atoi(optarg);
break;
}
}
if (optind != argc - 1)
err_quit("Usage: create [-e] [-i arg] <name>");
sem = Sem_open(argv[optind], flags, FILE_MODE, value);
Sem_close(sem);
exit(0);
}
int main(void) {
sem_t * sem;
sem = sem_open("/tmp/test0", O_CREAT | O_RDWR, FILE_MODE, 1);
if (sem == SEM_FAILED) {
printf("sem_open failed (%s)\n", strerror(errno));
return 1;
}
Sem_unlink("/tmp/test0");
Sem_close(sem);
return 0;
}
int main(int argc, char **argv)
{
int fd;
struct shmstruct *ptr;
if (argc != 3)
err_quit("Usage: server <shmname> <semname>");
shm_unlink((const char *)Px_ipc_name(argv[1]));
//create shm, set its size, map it, close descriptor
fd = Shm_open(Px_ipc_name(argv[1]), O_RDWR | O_CREAT | O_EXCL, FILE_MODE);
Ftruncate(fd, sizeof(struct shmstruct));
ptr = Mmap(NULL, sizeof(struct shmstruct), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
Close(fd);
sem_unlink((const char *)Px_ipc_name(argv[2]));
mutex = Sem_open(Px_ipc_name(argv[2]), O_CREAT | O_EXCL, FILE_MODE, 1);
Sem_close(mutex);
exit(0);
}