hasmntopt man page on ElementaryOS

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

NAME
       getmntent,  setmntent,  addmntent,  endmntent, hasmntopt, getmntent_r -
       get filesystem 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	 filesystem  description  file
       /etc/fstab and the mounted filesystem description file /etc/mtab.

       The setmntent() function opens the filesystem description file filename
       and returns a file pointer which can be used by getmntent().  The argu‐
       ment  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  filesystem
       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 filesystem 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 filesystem */
	       char *mnt_dir;	   /* filesystem 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	   filesystem description file
       /etc/mtab	   mounted filesystem description file

CONFORMING TO
       The  nonreentrant  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 3.54 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/.

				  2009-09-15			  GETMNTENT(3)
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