bwrite Kernel Service
Purpose
Writes the specified buffer data.
Syntax
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/buf.h>int bwrite ( bp)
struct buf *bp;
struct buf *bp;
Parameter
| Item | Description |
|---|---|
| bp | Specifies the address
of the buffer structure for the buffer
to be written. On a platform that supports storage keys, the passed in bp parameter must be in the KKEY_PUBLIC or KKEY_BLOCK_DEV protection domain. |
Description
The bwrite kernel service writes the specified buffer data. If this is a synchronous request, the bwrite service waits for the I/O to complete.
"Block I/O Buffer Cache Kernel Services: Overview" in Kernel Extensions and Device Support Programming Concepts describes how the three buffer-cache write routines work.
Execution Environment
The bwrite kernel service can be called from the process environment only.
Return Values
| Item | Description |
|---|---|
| 0 | Indicates a successful operation. |
| ERRNO | Returns an error number from the /usr/include/sys/errno.h file on error. |