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msgids (2)
  • >> msgids (2) ( Solaris man: Системные вызовы )
  •  

    NAME

    msgids - discover all message queue identifiers
     
    

    SYNOPSIS

    #include <sys/msg.h>
    
    int msgids(int *buf, uint_t nids, uint_t  *pnids);
    

     

    DESCRIPTION

    The msgids() function copies all active message queue identifiers from the system into the user-defined buffer specified by buf, provided that the number of such identifiers is not greater than the number of integers the buffer can contain, as specified by nids. If the size of the buffer is insufficient to contain all of the active message queue identifiers in the system, none are copied.

    Whether or not the size of the buffer is sufficient to contain all of them, the number of active message queue identifiers in the system is copied into the unsigned integer pointed to by pnids.

    If nids is 0 or less than the number of active message queue identifiers in the system, buf is ignored.  

    RETURN VALUES

    Upon successful completion, msgids() returns 0. Otherwise, -1 is returned and errno is set to indicate the error.  

    ERRORS

    The msgids() function will fail if:

    EFAULT

    The buf or pnids argument points to an illegal address.

     

    USAGE

    The msgids() function returns a snapshot of all the active message queue identifiers in the system. More may be added and some may be removed before they can be used by the caller.  

    EXAMPLES

    Example 1 msgids() example

    This is sample C code indicating how to use the msgids() function (see msgsnap(2)):

    void
    examine_queues()
    {
        int *ids = NULL;
        uint_t nids = 0;
        uint_t n;
        int i;
    
        for (;;) {
             if (msgids(ids, nids, &n) != 0) {
                  perror("msgids");
                  exit(1);
             }
             if (n <= nids)     /* we got them all */
                  break;
             /* we need a bigger buffer */
             ids = realloc(ids, (nids = n) * sizeof (int));
        }   
    
        for (i = 0; i < n; i++)
             process_msgid(ids[i]);
    
        free(ids);
    }
    

     

    ATTRIBUTES

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

    ATTRIBUTE TYPEATTRIBUTE VALUE

    MT-LevelAsync-Signal-Safe

     

    SEE ALSO

    ipcrm(1), ipcs(1), Intro(2), msgctl(2), msgget(2), msgsnap(2), msgrcv(2), msgsnd(2), attributes(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    EXAMPLES
    ATTRIBUTES
    SEE ALSO


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