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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 
       #include 

       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 */
       #define _GNU_SOURCE    /* or _SVID_SOURCE or _BSD_SOURCE */
       #include 

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

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
       getmntent().

       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 
       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  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 */
	      };

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 HPUX 10, but it returns an int. The proto-
       type shown above is glibc-only.	LSB deprecates the functions  endhos-
       tent(), sethostent() and setmntent().

NOTES
       SysV also has a getmntent() function but the calling sequence differs,
       and the returned structure is different.	 Under	SysV  /etc/mnttab  is
       used.  BSD 4.4 and Digital Unix have a routine getmntinfo(), a wrapper
       around the system call getfsstat().

SEE ALSO
       fopen(3), fstab(5)



				  2003-11-15			 GETMNTENT(3)