[ Bottom of Page | Previous Page | Next Page | Contents | Index | Library Home | Legal | Search ]

Technical Reference: Communications, Volume 2

getpmsg System Call

Purpose

Gets the next priority message off a stream.

Syntax

#include <stropts.h>


int getpmsg (fd, ctlptr, dataptr, bandp, flags)
int fd;
struct strbuf * ctlptr;
struct strbuf * dataptr;
int * bandp;
int * flags;

Description

The getpmsg system call is identical to the getmsg system call, except that the message priority can be specified.

This system call is part of the STREAMS Kernel Extensions.

Parameters

fd Specifies a file descriptor referencing an open stream.
ctlptr Holds the control part of the message.
dataptr Holds the data part of the message.
bandp Specifies the priority band of the message. If the value of the bandp parameter is set to 0, then the priority band is not limited.
flags Indicates the type of message priority to be retrieved. Acceptable values are:
MSG_ANY
Process the next message of any type.
MSG_BAND
Process the next message only if it is of the specified priority band.
MSG_HIPRI
Process the next message only if it is a priority message.

If the value of the flags parameter is MSG_ANY or MSG_HIPRI, then the bandp parameter must be set to 0.

Related Information

The poll subroutine, read subroutine, write subroutine.

The getmsg system call, putmsg system call, putpmsg system call.

List of Streams Programming References and STREAMS Overview in AIX 5L Version 5.2 Communications Programming Concepts.

[ Top of Page | Previous Page | Next Page | Contents | Index | Library Home | Legal | Search ]