Manpage of GETFSENT

GETFSENT

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index
 

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 fstabis 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_typecontains (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_specfield matches the special_fileargument.

The function getfsfile() searches the file from the start and returns the first entry found for which the fs_filefield matches the mount_pointargument.  

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.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
endfsent(),
setfsent()
Thread safetyMT-Unsafe race:fsent
getfsent(),
getfsspec(),
getfsfile()
Thread safetyMT-Unsafe race:fsent locale
 

CONFORMING TO

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of the same names, that however use a struct checklistinstead of a struct fstab, and calls these functions obsolete, superseded by getmntent(3).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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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Time: 22:27:48 GMT, June 20, 2016