Concatenates and aligns bytes in a message.
The pullupmsg utility concatenates and aligns the number of data bytes specified by the len parameter of the passed message into a single, contiguous message block. Proper alignment is hardware-dependent. The pullupmsg utility only concatenates across message blocks of similar type. It fails if the mp parameter points to a message of less than len bytes of similar type. If the len parameter contains a value of -1, the pullupmsg utility concatenates all blocks of the same type at the beginning of the message pointed to by the mp parameter.
As a result of the concatenation, the contents of the message pointed to by the mp parameter may be altered.
This utility is part of STREAMS Kernel Extensions.
| Item | Description |
|---|---|
| mp | Specifies the message that is to be aligned. |
| len | Specifies the number of bytes to align. |
On success, the pullupmsg utility returns a value of 1. On failure, it returns a value of 0.