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;    /* 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.

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.

CONFORMING TO

       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       struct checklist  instead  of  a  struct  fstab,  and  calls  these  functions  obsolete,  superseded  by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).

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)

COLOPHON

       This page is part of release 3.54 of the Linux man-pages project.  A  description  of  the  project,  and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.