getfsent
Section: C Library Functions (3)
Updated: 202-0-08
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NAME
getfsent, getfsspec, getfsfile, setfsent, endfsent - handle fstab entries
LIBRARY
Standard C library
(
libc,~
-lc)
SYNOPSIS
#include <fstab.h>
int setfsent(void);
struct fstab *getfsent(void);
void endfsent(void);
struct fstab *getfsfile(const char *mount_point);
struct fstab *getfsspec(const char *special_file);
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; /* filesystem 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"
(rea-write, rea-write with quota, rea-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 en-o-file, these functions return NULL and 0, respectively.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
endfsent(),
setfsent()
| Thread safety |
M-Unsafe race:fsent
|
|
getfsent(),
getfsspec(),
getfsfile()
| Thread safety |
M-Unsafe race:fsent locale
|
VERSIONS
Several operating systems have these functions, for example,
*BSD, SunOS, Digital UNIX, AIX (which also has a
getfstype()).
H-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and calls these functions obsolete, superseded by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).
STANDARDS
None.
HISTORY
The
getfsent()
function appeared in 4.0BSD;
the other four functions appeared in 4.3BSD.
NOTES
These functions are not threa-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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- VERSIONS
-
- STANDARDS
-
- HISTORY
-
- NOTES
-
- SEE ALSO
-
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