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Kernel Functions for Driversadjmsg(9F)


NAME

 adjmsg - trim bytes from a message

SYNOPSIS

 
#include <sys/stream.h>
int adjmsg(mblk_t *mp, ssize_t len);

INTERFACE LEVEL

 

Architecture independent level 1 (DDI/DKI).

PARAMETERS

 
mp
Pointer to the message to be trimmed.
len
The number of bytes to be removed.

DESCRIPTION

 

The adjmsg() function removes bytes from a message. |len| (the absolute value of len) specifies the number of bytes to be removed. The adjmsg() function only trims bytes across message blocks of the same type.

The adjmsg() function finds the maximal leading sequence of message blocks of the same type as that of mp and starts removing bytes either from the head of that sequence or from the tail of that sequence. If len is greater than 0, adjmsg() removes bytes from the start of the first message block in that sequence. If len is less than 0, it removes bytes from the end of the last message block in that sequence.

The adjmsg() function fails if |len| is greater than the number of bytes in the maximal leading sequence it finds.

The adjmsg() function may remove any except the first zero-length message block created during adjusting. It may also remove any zero-length message blocks that occur within the scope of |len|.

RETURN VALUES

 

The adjmsg() function returns:

1
Successful completion.
0
An error occurred.

CONTEXT

 

The adjmsg() function can be called from user or interrupt context.

SEE ALSO

 

STREAMS Programming Guide


SunOS 5.9Go To TopLast Changed 20 Nov 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.