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 for valid mount options.
The mntent structure is defined in as follows:
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.
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