1GETFSENT(3)                Linux Programmer's Manual               GETFSENT(3)
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NAME

6       getfsent,  getfsspec,  getfsfile,  setfsent,  endfsent  -  handle fstab
7       entries
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SYNOPSIS

10       #include <fstab.h>
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12       void endfsent(void);
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14       struct fstab *getfsent(void);
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16       struct fstab *getfsfile(const char *mount_point);
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18       struct fstab *getfsspec(const char *special_file);
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20       int setfsent(void);
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DESCRIPTION

23       These functions read from the file /etc/fstab.   The  struct  fstab  is
24       defined by:
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26           struct fstab {
27               char       *fs_spec;       /* block device name */
28               char       *fs_file;       /* mount point */
29               char       *fs_vfstype;    /* file-system type */
30               char       *fs_mntops;     /* mount options */
31               const char *fs_type;       /* rw/rq/ro/sw/xx option */
32               int         fs_freq;       /* dump frequency, in days */
33               int         fs_passno;     /* pass number on parallel dump */
34           };
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36       Here  the  field  fs_type  contains  (on a *BSD system) one of the five
37       strings "rw", "rq",  "ro",  "sw",  "xx"  (read-write,  read-write  with
38       quota, read-only, swap, ignore).
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40       The  function  setfsent() opens the file when required and positions it
41       at the first line.
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43       The function getfsent() parses the next line  from  the  file.   (After
44       opening it when required.)
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46       The function endfsent() closes the file when required.
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48       The  function  getfsspec() searches the file from the start and returns
49       the first entry found for which the  fs_spec  field  matches  the  spe‐
50       cial_file argument.
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52       The  function  getfsfile() searches the file from the start and returns
53       the  first  entry  found  for  which  the  fs_file  field  matches  the
54       mount_point argument.
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RETURN VALUE

57       Upon  success,  the  functions getfsent(), getfsfile(), and getfsspec()
58       return a pointer to a struct fstab, while setfsent() returns  1.   Upon
59       failure  or  end-of-file,  these  functions  return NULL and 0, respec‐
60       tively.
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ATTRIBUTES

63       For  an  explanation  of  the  terms  used   in   this   section,   see
64       attributes(7).
65
66       ┌─────────────┬───────────────┬─────────────────────────────┐
67Interface    Attribute     Value                       
68       ├─────────────┼───────────────┼─────────────────────────────┤
69endfsent(),  │ Thread safety │ MT-Unsafe race:fsent        │
70setfsent()   │               │                             │
71       ├─────────────┼───────────────┼─────────────────────────────┤
72getfsent(),  │ Thread safety │ MT-Unsafe race:fsent locale │
73getfsspec(), │               │                             │
74getfsfile()  │               │                             │
75       └─────────────┴───────────────┴─────────────────────────────┘

CONFORMING TO

77       These  functions  are  not  in POSIX.1.  Several operating systems have
78       them, for example, *BSD, SunOS, Digital UNIX, AIX  (which  also  has  a
79       getfstype()).   HP-UX has functions of the same names, that however use
80       a struct checklist instead of a struct fstab, and calls these functions
81       obsolete, superseded by getmntent(3).
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NOTES

84       These functions are not thread-safe.
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86       Since  Linux  allows mounting a block special device in several places,
87       and since several devices can have the same mount point, where the last
88       device  with  a  given mount point is the interesting one, while getfs‐
89       file() and getfsspec() only return  the  first  occurrence,  these  two
90       functions are not suitable for use under Linux.
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SEE ALSO

93       getmntent(3), fstab(5)
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COLOPHON

96       This  page  is  part of release 4.15 of the Linux man-pages project.  A
97       description of the project, information about reporting bugs,  and  the
98       latest     version     of     this    page,    can    be    found    at
99       https://www.kernel.org/doc/man-pages/.
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103GNU                               2017-09-15                       GETFSENT(3)
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