SHMGET(2)

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SHMGET(2)

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shmget - ��

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        #include <sys/types.h>
        #include <sys/ipc.h>
        #include <sys/shm.h>
        
        int shmget (key, size, shmflg)
        key_t key;
        int size, shmflg;

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�� shmget �� , �� key.

�� size �� [��. intro(2)] �� key � �� :

�� key �� IPC_PRIVATE.
�� key �� (shmflg & IPC_CREAT) ��.

�� , �� , �� :

�� shm_perm.cuid, shm_perm.uid, shm_perm.cgid � shm_perm.gid �� , ��, �� .
�� 9 �� shm_perm.mode �� 9 �� shmflg; �� shm_segsz �� size;
�� shm_lpid, shm_nattch, shm_atime � shm_dtime �� 0.
�� shm_ctime �� .

�� shmget �� , �� :

[EINVAL]: �� size �� , �� .
[EACCES]: �� key �� , �� [��. intro(2)], �� 9 �� shmflg.
[EINVAL]: �� key �� , �� size � �� size �� .
[ENOENT]: �� key �� (shmflg & IPC_CREAT) ��.
[ENOSPC]: �� -�� .
[ENOMEM]: �� -�� .
[EEXIST]: �� key �� ((shmflg & IPC_CREAT) & (shmflg & IPC_EXCL)) ��.

��. ��
intro(2), shmctl(2), shmop(2).

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�� - �� . � �� -1, � �� errno �� .