getfsent(3) - Linux manual page (original) (raw)

getfsent(3) Library Functions Manual getfsent(3)

NAME top

   getfsent, getfsspec, getfsfile, setfsent, endfsent - handle fstab
   entries

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <fstab.h>**

   **int setfsent(void);**
   **struct fstab *getfsent(void);**
   **void endfsent(void);**

   **struct fstab *getfsfile(const char ***_mountpoint_**);**
   **struct fstab *getfsspec(const char ***_specialfile_**);**

DESCRIPTION top

   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 _fstype_ 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 _fsspec_ field matches
   the _specialfile_ argument.

   The function **getfsfile**() searches the file from the start and
   returns the first entry found for which the _fsfile_ field matches
   the _mountpoint_ argument.

RETURN VALUE top

   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.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────┬───────────────┬─────────────────────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────┼───────────────┼─────────────────────────────────┤
   │ **endfsent**(),  │ Thread safety │ MT-Unsafe race:fsent            │
   │ **setfsent**()   │               │                                 │
   ├──────────────┼───────────────┼─────────────────────────────────┤
   │ **getfsent**(),  │ Thread safety │ MT-Unsafe race:fsent locale     │
   │ **getfsspec**(), │               │                                 │
   │ **getfsfile**()  │               │                                 │
   └──────────────┴───────────────┴─────────────────────────────────┘

VERSIONS top

   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)](../man3/getmntent.3.html).

STANDARDS top

   None.

HISTORY top

   The **getfsent**() function appeared in 4.0BSD; the other four
   functions appeared in 4.3BSD.

NOTES top

   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 top

   [getmntent(3)](../man3/getmntent.3.html), [fstab(5)](../man5/fstab.5.html)

COLOPHON top

   This page is part of the _man-pages_ (Linux kernel and C library
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Linux man-pages 6.10 2024-07-23 getfsent(3)