SHMCTL(2)

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SHMCTL(2)

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shmctl - ��

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        #include <sys/types.h>
        #include <sys/ipc.h>
        #include <sys/shm.h>
        
        int shmctl (shmid, cmd, buf)
        int shmid, cmd;
        struct shmid_ds *buf;

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�� shmctl �� . �� cmd, �� :

IPC_STAT

�� , �� shmid, � ��, �� buf. �� intro(2). {�� .}

IPC_SET

�� , �� shmid, �� , �� , �� buf:

   shm_perm.uid
   shm_perm.gid
   shm_perm.mode  /* ������ ������� 9 ��� */

�� , �� , �� , �� shm_perm.cuid �� shm_perm.uid � ��, �� shmid.

IPC_RMID

�� , �� shmid, �� . �� , �� , �� , �� shm_perm.cuid �� shm_perm.uid � �� , �� shmid.

SHM_LOCK

�� , �� shmid. �� , �� , �� .

SHM_UNLOCK

�� , �� shmid. �� , �� , �� .

�� shmctl �� , �� :

[EINVAL]: �� shmid �� .
[EINVAL]: �� cmd, �� .
[EACCES]: �� cmd �� IPC_STAT, �� [��. intro(2)].
[EPERM]: �� cmd �� IPC_RMID �� IPC_SET, � �� , �� shm_perm.cuid �� shm_perm.uid � �� , �� shmid.
[EPERM]: �� cmd �� SHM_LOCK �� SHM_UNLOCK, � �� .
[EFAULT]: �� buf �� .
[ENOMEM]: �� cmd �� SHM_LOCK � �� .

��. ��
shmget(2), shmop(2).

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�� 0; � �� -1, � �� errno �� .