mnt_context_find_umount_fs ()

int
mnt_context_find_umount_fs (struct libmnt_context *cxt,
                            const char *tgt,
                            struct libmnt_fs **pfs);

mnt_context_do_umount ()

int
mnt_context_do_umount (struct libmnt_context *cxt);

Umount filesystem by umount(2) or fork()+exec(/sbin/umount.type). Unnecessary for mnt_context_umount().

See also mnt_context_disable_helpers().

WARNING: non-zero return code does not mean that umount(2) syscall or umount.type helper wasn't successfully called.

Check mnt_context_get_status() after error!

mnt_context_finalize_umount ()

int
mnt_context_finalize_umount (struct libmnt_context *cxt);

Mtab update, etc. Unnecessary for mnt_context_umount(), but should be called after mnt_context_do_umount(). See also mnt_context_set_syscall_status().

mnt_context_next_umount ()

int
mnt_context_next_umount (struct libmnt_context *cxt,
                         struct libmnt_iter *itr,
                         struct libmnt_fs **fs,
                         int *mntrc,
                         int *ignored);

This function tries to umount the next filesystem from mountinfo file.

You can filter out filesystems by: mnt_context_set_options_pattern() to simulate umount -a -O pattern mnt_context_set_fstype_pattern() to simulate umount -a -t pattern

If the filesystem is not mounted or does not match the defined criteria, then the function mnt_context_next_umount() returns zero, but the ignored is non-zero. Note that the root filesystem is always ignored.

If umount(2) syscall or umount.type helper failed, then the mnt_context_next_umount() function returns zero, but the mntrc is non-zero. Use also mnt_context_get_status() to check if the filesystem was successfully umounted.

mnt_context_prepare_umount ()

int
mnt_context_prepare_umount (struct libmnt_context *cxt);

Prepare context for umounting, unnecessary for mnt_context_umount().

mnt_context_umount ()

int
mnt_context_umount (struct libmnt_context *cxt);

High-level, umounts filesystem by umount(2) or fork()+exec(/sbin/umount.type).

This is similar to:

mnt_context_prepare_umount(cxt); mnt_context_do_umount(cxt); mnt_context_finalize_umount(cxt);

See also mnt_context_disable_helpers().

WARNING: non-zero return code does not mean that umount(2) syscall or umount.type helper wasn't successfully called.

Check mnt_context_get_status() after error!