getfsent, getfsspec, getfsfile, setfsent, endfsent — handle fstab entries
#include <fstab.h>
void
endfsent( |
void); |
struct fstab *getfsent( |
void); |
struct fstab *getfsfile( |
const char * | mount_point); |
struct fstab *getfsspec( |
const char * | special_file); |
int
setfsent( |
void); |
These functions read from the file /etc/fstab. The struct fstab is defined by:
struct fstab { char * fs_spec;char * fs_file;char * fs_vfstype;char * fs_mntops;const char * fs_type;int fs_freq;int fs_passno;};
Here the field fs_type contains (on a *BSD
system) one of the five strings "rw", "rq", "ro", "sw", "xx"
(read-write, read-write with quota, read-only, swap,
ignore).
The function setfsent()
opens the file when required and positions it at the first
line.
The function getfsent()
parses the next line from the file. (After opening it when
required.)
The function endfsent()
closes the file when required.
The function getfsspec()
searches the file from the start and returns the first entry
found for which the fs_spec field matches the
special_file
argument.
The function getfsfile()
searches the file from the start and returns the first entry
found for which the fs_file field matches the
mount_point
argument.
Upon success, the functions getfsent(), getfsfile(), and getfsspec() return a pointer to a
struct fstab, while
setfsent() returns 1. Upon
failure or end-of-file, these functions return NULL and 0,
respectively.
These functions are not in POSIX.1-2001. Several operating
systems have them, e.g., *BSD, SunOS, Digital Unix, AIX
(which also has a getfstype()).
HP-UX has functions of the same names, that however use a
struct checklist
instead of a struct
fstab, and calls these functions obsolete,
superseded by getmntent(3).
These functions are not thread-safe.
Since Linux allows mounting a block special device in
several places, and since several devices can have the same
mount point, where the last device with a given mount point
is the interesting one, while getfsfile() and getfsspec() only return the first
occurrence, these two functions are not suitable for use
under Linux.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright (C) 2002 Andries Brouwer (aebcwi.nl) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. Inspired by a page written by Walter Harms. |