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-system 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,


   For  an  explanation  of  the  terms  used   in   this   section,   see

   Interface     Attribute      Value                       
   endfsent(),   Thread safety  MT-Unsafe race:fsent        
   getfsent(),   Thread safety  MT-Unsafe race:fsent locale 


   These  functions  are  not  in POSIX.1.  Several operating systems have
   them, 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   obsolete, superseded by getmntent(3).


   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)


   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at

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