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GETFSENT
Section: Linux Programmer's Manual (3)
Updated: 2002-02-28
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NAME
getfsent, getfsspec, getfsfile, setfsent, endfsent - handle fstab entries
SYNOPSIS
#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);
DESCRIPTION
These functions read from the file
/etc/fstab.
The struct fstab is defined by:
struct fstab {
char *fs_spec; /* block device name */
char *fs_file; /* mount point */
char *fs_vfstype; /* file-sysem type */
char *fs_mntops; /* mount options */
const char *fs_type; /* rw/rq/ro/sw/xx option */
int fs_freq; /* dump frequency, in days */
int fs_passno; /* pass number on parallel dump */
};
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.
RETURN VALUE
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.
CONFORMING TO
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and calls these functions obsolete, superseded by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).
NOTES
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.
SEE ALSO
getmntent(3),
fstab(5)
COLOPHON
This page is part of release 3.42 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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