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GETFSENT(3)			    Linux Programmer's Manual			      GETFSENT(3)

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;	    /* 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 quotas, 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.

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

CONFORMING TO
       These  functions are not in POSIX. 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       obsolete, superseded by getmntent(3).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)

Linux 2.5				    2002-02-28				      GETFSENT(3)
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