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

    NAME

    mq_setattr - set message queue attributes (REALTIME)
     
    

    SYNOPSIS

    #include <mqueue.h>

    int mq_setattr(mqd_t mqdes, const struct mq_attr *restrict mqstat,
           struct mq_attr *restrict
    omqstat);
     

    DESCRIPTION

    The mq_setattr() function shall set attributes associated with the open message queue description referenced by the message queue descriptor specified by mqdes.

    The message queue attributes corresponding to the following members defined in the mq_attr structure shall be set to the specified values upon successful completion of mq_setattr():

    mq_flags
    The value of this member is the bitwise-logical OR of zero or more of O_NONBLOCK and any implementation-defined flags.

    The values of the mq_maxmsg, mq_msgsize, and mq_curmsgs members of the mq_attr structure shall be ignored by mq_setattr().

    If omqstat is non-NULL, the mq_setattr() function shall store, in the location referenced by omqstat, the previous message queue attributes and the current queue status. These values shall be the same as would be returned by a call to mq_getattr() at that point.  

    RETURN VALUE

    Upon successful completion, the function shall return a value of zero and the attributes of the message queue shall have been changed as specified.

    Otherwise, the message queue attributes shall be unchanged, and the function shall return a value of -1 and set errno to indicate the error.  

    ERRORS

    The mq_setattr() function shall fail if:

    EBADF
    The mqdes argument is not a valid message queue descriptor.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    mq_open() , mq_send() , mq_timedsend() , msgctl() , msgget() , msgrcv() , msgsnd() , the Base Definitions volume of IEEE Std 1003.1-2001, <mqueue.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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