1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" %%%LICENSE_START(VERBATIM)
4 .\" Permission is granted to make and distribute verbatim copies of this
5 .\" manual provided the copyright notice and this permission notice are
6 .\" preserved on all copies.
8 .\" Permission is granted to copy and distribute modified versions of this
9 .\" manual under the conditions for verbatim copying, provided that the
10 .\" entire resulting derived work is distributed under the terms of a
11 .\" permission notice identical to this one.
13 .\" Since the Linux kernel and libraries are constantly changing, this
14 .\" manual page may be incorrect or out-of-date. The author(s) assume no
15 .\" responsibility for errors or omissions, or for damages resulting from
16 .\" the use of the information contained herein. The author(s) may not
17 .\" have taken the same level of care in the production of this manual,
18 .\" which is licensed free of charge, as they might when working
21 .\" Formatted or processed versions of this manual, if unaccompanied by
22 .\" the source, must acknowledge the copyright and authors of this work.
25 .\" References consulted:
26 .\" Linux libc source code
27 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
29 .\" Modified Sat Jul 24 21:46:57 1993 by Rik Faith (faith@cs.unc.edu)
30 .\" Modified 961109, 031115, aeb
32 .TH GETMNTENT 3 2015-01-22 "" "Linux Programmer's Manual"
34 getmntent, setmntent, addmntent, endmntent, hasmntopt,
35 getmntent_r \- get filesystem descriptor file entry
39 .B #include <mntent.h>
41 .BI "FILE *setmntent(const char *" filename ", const char *" type );
43 .BI "struct mntent *getmntent(FILE *" stream );
45 .BI "int addmntent(FILE *" stream ", const struct mntent *" mnt );
47 .BI "int endmntent(FILE *" streamp );
49 .BI "char *hasmntopt(const struct mntent *" mnt ", const char *" opt );
52 .B #include <mntent.h>
54 .BI "struct mntent *getmntent_r(FILE *" streamp ", struct mntent *" mntbuf ,
55 .BI " char *" buf ", int " buflen );
59 Feature Test Macro Requirements for glibc (see
60 .BR feature_test_macros (7)):
64 _BSD_SOURCE || _SVID_SOURCE
66 These routines are used to access the filesystem description file
68 and the mounted filesystem description file
73 function opens the filesystem description file
75 and returns a file pointer which can be used by
80 required and can take the same values as the
87 function reads the next line of the filesystem
90 and returns a pointer to a structure
91 containing the broken out fields from a line in the file.
93 points to a static area of memory which is overwritten by subsequent
111 associated with the filesystem description file.
122 for a substring that matches
128 for valid mount options.
132 function is similar to
138 and stores the strings pointed to by the entries in that struct
139 in the provided array
146 structure is defined in
153 char *mnt_fsname; /* name of mounted filesystem */
154 char *mnt_dir; /* filesystem path prefix */
155 char *mnt_type; /* mount type (see mntent.h) */
156 char *mnt_opts; /* mount options (see mntent.h) */
157 int mnt_freq; /* dump frequency in days */
158 int mnt_passno; /* pass number on parallel fsck */
163 Since fields in the mtab and fstab files are separated by whitespace,
164 octal escapes are used to represent the four characters space (\e040),
165 tab (\e011), newline (\e012) and backslash (\e134) in those files
166 when they occur in one of the four strings in a
174 from string representation to escaped representation and back.
183 structure or NULL on failure.
187 function returns 0 on success and 1 on failure.
191 function always returns 1.
195 function returns the address of the substring if
196 a match is found and NULL otherwise.
199 /etc/fstab filesystem description file
200 /etc/mtab mounted filesystem description file
203 The nonreentrant functions are from SunOS 4.1.3.
206 was introduced in HP-UX 10, but it returns an int.
207 The prototype shown above is glibc-only.
211 function but the calling sequence
212 differs, and the returned structure is different.
216 4.4BSD and Digital UNIX have a routine
218 a wrapper around the system call
225 This page is part of release 3.79 of the Linux
228 A description of the project,
229 information about reporting bugs,
230 and the latest version of this page,
232 \%http://www.kernel.org/doc/man\-pages/.