setfsent

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, respec-
       tively.

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 check-
       list 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 getfs-
       file() 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)