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

NAME
       getmntent,  setmntent,  addmntent,  endmntent, hasmntopt, getmntent_r -
       get file system descriptor file entry

SYNOPSIS
       #include <stdio.h>
       #include <mntent.h>

       FILE *setmntent(const char *filename, const char *type);

       struct mntent *getmntent(FILE *fp);

       int addmntent(FILE *fp, const struct mntent *mnt);

       int endmntent(FILE *fp);

       char *hasmntopt(const struct mntent *mnt, const char *opt);

       /* GNU extension */
       #include <mntent.h>

       struct mntent *getmntent_r(FILE *fp, struct mntent *mntbuf,
				  char *buf, int buflen);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getmntent_r(): _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       These routines are used to access  the  file  system  description  file
       /etc/fstab and the mounted file system description file /etc/mtab.

       The  setmntent() function opens the file system description file fp and
       returns a file pointer which can be used by getmntent().	 The  argument
       type is the type of access required and can take the same values as the
       mode argument of fopen(3).

       The getmntent() function reads the  next	 line  from  the  file	system
       description file fp and returns a pointer to a structure containing the
       broken out fields from a line in the file.  The	pointer	 points	 to  a
       static area of memory which is overwritten by subsequent calls to getm‐
       ntent().

       The addmntent() function adds the mntent structure mnt to  the  end  of
       the open file fp.

       The endmntent() function closes the file system description file fp.

       The  hasmntopt()	 function  scans the mnt_opts field (see below) of the
       mntent structure mnt for a substring that matches opt.  See  <mntent.h>
       and mount(8) for valid mount options.

       The  reentrant  getmntent_r()  function	is similar to getmntent(), but
       stores the struct mount in the provided *mntbuf and stores the  strings
       pointed	to  by the entries in that struct in the provided array buf of
       size buflen.

       The mntent structure is defined in <mntent.h> as follows:

	   struct mntent {
	       char *mnt_fsname;   /* name of mounted file system */
	       char *mnt_dir;	   /* file system path prefix */
	       char *mnt_type;	   /* mount type (see mntent.h) */
	       char *mnt_opts;	   /* mount options (see mntent.h) */
	       int   mnt_freq;	   /* dump frequency in days */
	       int   mnt_passno;   /* pass number on parallel fsck */
	   };

       Since fields in the mtab and fstab files are separated  by  whitespace,
       octal  escapes  are used to represent the four characters space (\040),
       tab (\011), newline (\012) and backslash (\134)	in  those  files  when
       they  occur in one of the four strings in a mntent structure.  The rou‐
       tines addmntent() and getmntent() will convert from string  representa‐
       tion to escaped representation and back.

RETURN VALUE
       The  getmntent()	 and  getmntent_r()  functions return a pointer to the
       mntent structure or NULL on failure.

       The addmntent() function returns 0 on success and 1 on failure.

       The endmntent() function always returns 1.

       The hasmntopt() function returns the address  of	 the  substring	 if  a
       match is found and NULL otherwise.

FILES
       /etc/fstab	   file system description file
       /etc/mtab	   mounted file system description file

CONFORMING TO
       The  non-reentrant  functions  are  from SunOS 4.1.3.  A routine getmn‐
       tent_r() was introduced in HP-UX 10, but it returns an int.  The proto‐
       type shown above is glibc-only.

NOTES
       System  V also has a getmntent() function but the calling sequence dif‐
       fers,  and  the	returned  structure  is	 different.   Under  System  V
       /etc/mnttab  is	used.	4.4BSD	and  Digital Unix have a routine getm‐
       ntinfo(), a wrapper around the system call getfsstat().

SEE ALSO
       fopen(3), fstab(5), mount(8)

COLOPHON
       This page is part of release 3.22 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/.

				  2008-06-16			  GETMNTENT(3)
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