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 quo-
       tas, 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  spe-
       cial_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       superseded by getmntent(3).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)