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msgctl (2)
  • >> msgctl (2) ( Solaris man: Системные вызовы )
  • msgctl (2) ( Русские man: Системные вызовы )
  • msgctl (2) ( Linux man: Системные вызовы )
  • msgctl (3) ( FreeBSD man: Библиотечные вызовы )
  • msgctl (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    msgctl - message control operations
     
    

    SYNOPSIS

    #include <sys/msg.h>
    
    int msgctl(int msqid, int cmd, struct msqid_ds *buf);
    

     

    DESCRIPTION

    The msgctl() function provides a variety of message control operations as specified by cmd. The following cmds are available:

    IPC_STAT

    Place the current value of each member of the data structure associated with msqid into the structure pointed to by buf. The contents of this structure are defined in Intro(2).

    IPC_SET

    Set the value of the following members of the data structure associated with msqid to the corresponding value found in the structure pointed to by buf:

    msg_perm.uid
    msg_perm.gid
    msg_perm.mode /* access permission bits only */
    msg_qbytes
    

    This command can be executed only by a process that has either the {PRIV_IPC_OWNER} privilege or an effective user ID equal to the value of msg_perm.cuid or msg_perm.uid in the data structure associated with msqid. Only a process with the {PRIV_SYS_IPC_CONFIG} privilege can raise the value of msg_qbytes.

    IPC_RMID

    Remove the message queue identifier specified by msqid from the system and destroy the message queue and data structure associated with it. This cmd can only be executed by a process that has an effective user ID either with appropriate privileges asserted in the effective set or equal to the value of msg_perm.cuid or msg_perm.uid in the data structure associated with msqid. The buf argument is ignored.

     

    RETURN VALUES

    Upon successful completion, msgctl() returns 0. Otherwise, it returns -1 and sets errno to indicate the error.  

    ERRORS

    The msgctl() function will fail if:

    EACCES

    The cmd argument is IPC_STAT and operation permission is denied to the calling process (see Intro(2)).

    EFAULT

    The buf argument points to an illegal address.

    EINVAL

    The msqid argument is not a valid message queue identifier; or the cmd argument is not a valid command or is IPC_SET and msg_perm.uid or msg_perm.gid is not valid.

    EOVERFLOW

    The cmd argument is IPC_STAT and uid or gid is too large to be stored in the structure pointed to by buf.

    EPERM

    The cmd argument is IPC_RMID or IPC_SET, the {PRIV_SYS_IPC_OWNER} privilege is not asserted in the effective set of the calling process, and is not equal to the value of msg_perm.cuid or msg_perm.uid in the data structure associated with msqid.

    The cmd argument is IPC_SET, an attempt is being made to increase to the value of msg_qbytes, and the {PRIV_SYS_IPC_CONFIG} privilege is not asserted in the effective set of the calling process.

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    Intro(2), msgget(2), msgrcv(2), msgsnd(2), attributes(5), privileges(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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