redhat man page for getmntent

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

NAME
       getmntent, setmntent, addmntent, endmntent, hasmntopt - 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 *filep);

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

       int endmntent(FILE *filep);

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

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 filep 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 filep 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 filep.

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

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

       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 */
	      };

RETURN VALUE
       The getmntent() function returns 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
       SunOS 4.1.3.

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)

								    1993-06-27							      GETMNTENT(3)