linux-master/ipc/sem.c

843  * @semnum: semaphore that was modified.
848  * be called with semnum = -1, as well as with the number of each modified
854 static int wake_const_ops(struct sem_array *sma, int semnum,
861 	if (semnum == -1)
864 		pending_list = &sma->sems[semnum].pending_const;
936  * @semnum: semaphore that was modified.
941  * be called with semnum = -1, as well as with the number of each modified
949 static int update_queue(struct sem_array *sma, int semnum, struct wake_q_head *wake_q)
955 	if (semnum == -1)
958 		pending_list = &sma->sems[semnum].pending_alter;
971 		if (semnum != -1 && sma->sems[semnum].semval == 0)
1070  * check_qop: Test if a queued operation sleeps on the semaphore semnum
1072 static int check_qop(struct sem_array *sma, int semnum, struct sem_queue *q,
1088 	if (sop->sem_num != semnum)
1106 static int count_semcnt(struct sem_array *sma, ushort semnum,
1116 		l = &sma->sems[semnum].pending_const;
1118 		l = &sma->sems[semnum].pending_alter;
1129 		semcnt += check_qop(sma, semnum, q, count_zero);
1133 			semcnt += check_qop(sma, semnum, q, count_zero);
1343 static int semctl_setval(struct ipc_namespace *ns, int semid, int semnum,
1362 	if (semnum < 0 || semnum >= sma->sem_nsems) {
1387 	semnum = array_index_nospec(semnum, sma->sem_nsems);
1388 	curr = &sma->sems[semnum];
1392 		un->semadj[semnum] = 0;
1405 static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
1532 	if (semnum < 0 || semnum >= nsems)
1541 	semnum = array_index_nospec(semnum, nsems);
1542 	curr = &sma->sems[semnum];
1552 		err = count_semcnt(sma, semnum, 0);
1555 		err = count_semcnt(sma, semnum, 1);
1651 static long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg, int version)
1682 		return semctl_main(ns, semid, semnum, cmd, p);
1692 		return semctl_setval(ns, semid, semnum, val);
1705 SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
1707 	return ksys_semctl(semid, semnum, cmd, arg, IPC_64);
1711 long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg)
1715 	return ksys_semctl(semid, semnum, cmd, arg, version);
1718 SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
1720 	return ksys_old_semctl(semid, semnum, cmd, arg);
1774 static long compat_ksys_semctl(int semid, int semnum, int cmd, int arg, int version)
1805 		return semctl_main(ns, semid, semnum, cmd, p);
1807 		return semctl_setval(ns, semid, semnum, arg);
1819 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
1821 	return compat_ksys_semctl(semid, semnum, cmd, arg, IPC_64);
1825 long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg)
1829 	return compat_ksys_semctl(semid, semnum, cmd, arg, version);
1832 COMPAT_SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, int, arg)
1834 	return compat_ksys_old_semctl(semid, semnum, cmd, arg);