-/*
- * create_posix_shm is never called concurrently within a process.
- */
-static
-int create_posix_shm(void)
-{
- char tmp_name[NAME_MAX];
- int shmfd, ret;
-
- ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid());
- if (ret < 0) {
- PERROR("snprintf");
- return -1;
- }
- /*
- * Allocate shm, and immediately unlink its shm oject, keeping
- * only the file descriptor as a reference to the object.
- * We specifically do _not_ use the / at the beginning of the
- * pathname so that some OS implementations can keep it local to
- * the process (POSIX leaves this implementation-defined).
- */
- shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700);
- if (shmfd < 0) {
- PERROR("shm_open");
- goto error_shm_open;
- }
- ret = shm_unlink(tmp_name);
- if (ret < 0 && errno != ENOENT) {
- PERROR("shm_unlink");
- goto error_shm_release;
- }
- return shmfd;
-
-error_shm_release:
- ret = close(shmfd);
- if (ret) {
- PERROR("close");
- }
-error_shm_open:
- return -1;
-}
-