Technical Reference: Kernel and Subsystems, Volume 1

fp_access Kernel Service

Purpose

Checks for access permission to an open file.

Syntax

#include <sys/types.h>
#include <sys/errno.h>
int fp_access ( fp, perm)
struct file *fp;
int perm;

Parameters

fp	Points to a file structure returned by the fp_open or fp_opendev kernel service.
perm	Indicates which read, write, and execute permissions are to be checked. The /usr/include/sys/mode.h file contains pertinent values (IREAD, IWRITE, IEXEC).

Description

The fp_access kernel service is used to see if either the read, write, or exec bit is set anywhere in a file's permissions mode. Set perm to one of the following constants from mode.h:

IREAD
IWRITE
IEXEC

Execution Environment

The fp_access kernel service can be called from the process environment only.

Return Values

0	Indicates that the calling process has the requested permission.
EACCES	Indicates all other conditions.

Related Information

The access subroutine.

Logical File System Kernel Services in AIX 5L Version 5.2 Kernel Extensions and Device Support Programming Concepts.