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msgget (2)
  • msgget (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> msgget (2) ( Solaris man: Системные вызовы )
  • msgget (2) ( Русские man: Системные вызовы )
  • msgget (2) ( Linux man: Системные вызовы )
  • msgget (3) ( FreeBSD man: Библиотечные вызовы )
  • msgget (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    msgget - get message queue
     
    

    SYNOPSIS

    #include <sys/msg.h>
    
    int msgget(key_t key, int msgflg);
    

     

    DESCRIPTION

    The msgget() argument returns the message queue identifier associated with key.

    A message queue identifier and associated message queue and data structure (see Intro(2)) are created for key if one of the following are true:

    o key is IPC_PRIVATE.
    o key does not already have a message queue identifier associated with it, and (msgflg&IPC_CREAT) is true.

    On creation, the data structure associated with the new message queue identifier is initialized as follows:

    o msg_perm.cuid, msg_perm.uid, msg_perm.cgid, and msg_perm.gid are set to the effective user ID and effective group ID, respectively, of the calling process.
    o The low-order 9 bits of msg_perm.mode are set to the low-order 9 bits of msgflg.
    o msg_qnum, msg_lspid, msg_lrpid, msg_stime, and msg_rtime are set to 0.
    o msg_ctime is set to the current time.
    o msg_qbytes is set to the system limit. See NOTES.
     

    RETURN VALUES

    Upon successful completion, a non-negative integer representing a message queue identifier is returned. Otherwise, -1 is returned and errno is set to indicate the error.  

    ERRORS

    The msgget() function will fail if:

    EACCES

    A message queue identifier exists for key, but operation permission (see Intro(2)) as specified by the low-order 9 bits of msgflg would not be granted.

    EEXIST

    A message queue identifier exists for key but (msgflg&IPC_CREAT) and (msgflg&IPC_EXCL) are both true.

    ENOENT

    A message queue identifier does not exist for key and (msgflg&IPC_CREAT) is false.

    ENOSPC

    A message queue identifier is to be created but the system-imposed limit on the maximum number of allowed message queue identifiers system wide would be exceeded. See NOTES.

     

    ATTRIBUTES

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

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    rctladm(1M), Intro(2), msgctl(2), msgrcv(2), msgsnd(2), setrctl(2), ftok(3C), attributes(5), standards(5)  

    NOTES

    The system-defined limit used to initialize msg_qbytes is the minimum enforced value of the calling process's process.max-msg-qbytes resource control.

    The system-imposed limit on the number of message queue identifiers is maintained on a per-project basis using the project.max-msg-ids resource control. The zone.max-msg-ids resource control restricts the total amount of message queue identifiers that can be allocated by a zone.

    See rctladm(1M) and setrctl(2) for information about using resource controls.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO
    NOTES


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