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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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getfsent(3) Library Functions Manual getfsent(3)
getfsent, getfsspec, getfsfile, setfsent, endfsent - handle fstab
entries
Standard C library (libc, -lc)
#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);
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" (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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────┬───────────────┬────────────────────────────────┐
│ Interface │ Attribute │ Value │
├──────────────┼───────────────┼────────────────────────────────┤
│ endfsent(), │ Thread safety │ MT-Unsafe race:fsent │
│ setfsent() │ │ │
├──────────────┼───────────────┼────────────────────────────────┤
│ getfsent(), │ Thread safety │ MT-Unsafe race:fsent locale │
│ getfsspec(), │ │ │
│ getfsfile() │ │ │
└──────────────┴───────────────┴────────────────────────────────┘
Several operating systems have these functions, for example,
*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).
None.
The getfsent() function appeared in 4.0BSD; the other four
functions appeared in 4.3BSD.
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.
getmntent(3), fstab(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 getfsent(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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