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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 1

fp_open Kernel Service

Purpose

Opens special and regular files or directories.

Syntax 

#include <sys/types.h>
#include <sys/errno.h>
int fp_open (path, oflags, cmode, ext, segflag, fpp)
char *path;
unsigned oflags;
unsigned cmode;
int ext;
unsigned segflag;
struct file **fpp;

Parameters

path Points to the file name of the file to be opened.
oflags Specifies open mode flags as described in the open subroutine.
cmode Specifies the mode (permissions) value to be given to the file if the file is to be created.
ext Specifies an extension argument required by some device drivers. Individual drivers determine its content, form, and use.
segflag Specifies the flag indicating where the pointer specified by the path parameter is located:
SYS_ADSPACE The pointer specified by the path parameter is stored in kernel memory.
USER_ADSPACE The pointer specified by the path parameter is stored in application memory.
fpp Points to the location where the file structure pointer is to be returned by the fp_open service.

Description

The fp_open kernel service provides a common service used by:

Execution Environment

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

Return Values

0 Indicates a successful operation.

Also, the fpp parameter points to an open file structure that is valid for use with the other Logical File System services. If an error occurs, one of the values from the /usr/include/sys/errno.h file is returned. The discussion of the open subroutine contains possible errno values.

Implementation Specifics

The fp_open kernel service is part of Base Operating System (BOS) Runtime.

Related Information

The open subroutine.

Logical File System Kernel Services in AIX Version 4.3 Kernel Extensions and Device Support Programming Concepts.

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