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RedHat 9 (Linux i386) - man page for hasmntopt (redhat section 3)

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)


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