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


       #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);


       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;    /* file-sysem 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,


       These functions are not in  POSIX.1-2001.   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       obsolete, superseded by getmntent(3).


       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)


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