GETMNTENT(3)

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

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

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

int endmntent(filep)
FILE *filep;

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

struct mntent *getmntent(filep)
FILE *filep;

FILE *setmntent(filep, type)
char *filep;
char *type;

DESCRIPTION
These routines replace the getfsent routines for accessing the file system description file /etc/fstab. They are also used to access the mounted file system description file /etc/mtab.

Setmntent opens a file system description file and returns a file pointer which can then be used with getmntent, addmntent, or endmntent. The type argument is the same as in fopen(3). Getmntent reads the next line from filep and returns a pointer to an object with the following structure containing the broken-out fields of a line in the filesystem description file, <mntent.h>. The fields have meanings described in fstab(5). struct mntent {
    char    *mnt_fsname;    /* file system name */
    char    *mnt_dir;    /* file system path prefix */
    char    *mnt_type;    /* 4.2, nfs, swap, or xx */
    char    *mnt_opts;    /* ro, quota, etc. */
    int    mnt_freq;    /* dump frequency, in days */
    int    mnt_passno;    /* pass number on parallel fsck */
};

Addmntent adds the mntent structure mnt to the end of the open file filep. Note that filep has to be opened for writing if this is to work. Hasmntopt scans the mnt_opts field of the mntent structure mnt for a substring that matches opt. It returns the address of the substring if a match is found, 0 otherwise. Endmntent closes the file.

FILES
/etc/fstab
/etc/mtab

SEE ALSO
getfsent(3), fstab(5)

DIAGNOSTICS
Null pointer (0) returned on EOF or error.

BUGS
The returned mntent structure points to static information that is overwritten in each call.