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


     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 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.


     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-


     For   an   explanation   of   the  terms  used  in  this  section,  see
     allbox; lb lb lbw24 l l l.  Interface Attribute Value T{ endfsent(),
     setfsent() T}   Thread safety  MT-Unsafe race:fsent T{ getfsent(),
     getfsfile() T}   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  getfs-
     file()  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 4.16 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

GNU 2017-09-15 GETFSENT(3)

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