Performs a write operation on an open file with arguments passed.
#include <sys/types.h>
#include <sys/errno.h>
int fp_write
(fp, buf, nbytes, ext, segflag, countp)
struct file * fp;
char * buf;
int nbytes,
int ext;
int segflag;
int * countp;
| fp | Points to a file structure returned by the fp_open or fp_opendev kernel service. |
| buf | Points to the buffer where data to be written to a file is located. |
| nbytes | Indicates the number of bytes to be written to the file. |
| ext | Specifies an extension argument required by some device drivers. Its content, form, and use are determined by the individual driver. |
| segflag | Indicates in which part of memory the buffer specified by the buf parameter is located: |
| countp | Points to the location where count of bytes actually written to the file is to be returned. |
The fp_write kernel service is an internal interface to the function provided by the write subroutine.
The fp_write kernel service can be called from the process environment only.
| 0 | Indicates a successful operation. |
| ERRNO | Returns an error number from the /usr/include/sys/errno.h file on failure. |
The write subroutine.
Logical File System Kernel Services in AIX 5L Version 5.2 Kernel Extensions and Device Support Programming Concepts.