MSGCTL(2) MSGCTL(2)

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MSGCTL(2) MSGCTL(2)

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msgctl - ��

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        #include <sys/types.h>
        #include <sys/ipc.h>
        #include <sys/msg.h>

        int msgctl (msqid, cmd, buf)
        int msqid, cmd;
        struct msqid_ds *buf;

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�� msgctl �� . �� cmd, �� :

IPC_STAT

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

IPC_SET

�� , �� msqid, �� , �� , �� buf:

   msg_perm.uid
   msg_perm.gid
   msg_perm.mode /* ������ ������� 9 ��� */
   msg_qbytes

�� , �� , �� msg_perm.cuid �� msg_perm.uid � �� , �� msqid. �� msg_qbytes.

IPC_RMID

�� , �� msqid, �� . �� , �� , �� , �� msg_perm.cuid �� msg_perm.uid � �� , �� msqid.

�� msgctl �� , �� :

[EINVAL]: �� msgid �� .
[EINVAL]: �� cmd, �� .
[EACCES]: �� cmd �� IPC_STAT � ��
[��. intro(2)].
[EPERM]: �� cmd �� IPC_RMID �� IPC_SET � �� , �� msg_perm.cuid �� msg_perm.uid � �� , �� msqid.
[EPERM]: �� cmd �� IPC_SET � �� msg_qbytes, � �� .
[EFAULT]: �� buf �� .

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intro(2), msgget(2), msgop(2).