ADJMSG(9F)ADJMSG(9F)NAMEadjmsg - trim bytes from a message
int adjmsg(mblk_t *mp, ssize_t len);
Architecture independent level 1 (DDI/DKI).
Pointer to the message to be trimmed.
The number of bytes to be removed.
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 mes‐
sage block created during adjusting. It may also remove any zero-length
message blocks that occur within the scope of |len|.
The adjmsg() function returns:
An error occurred.
The adjmsg() function can be called from user, interrupt, or kernel
STREAMS Programming Guide
Jan 16, 2006 ADJMSG(9F)