libmount: clean up header file

 * don't teach people C by header files, so use warn_unused_result
   attribute only on places where we return allocated memory (to avoid
   leaks in applications).

 * merge multiple function attributes to the one list to make it
   usable with gtk-doc

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 132 insertions, 185 deletions

diff --git a/libmount/src/libmount.h.in b/libmount/src/libmount.h.in
index 9ba8e909a..ccd260d98 100644
--- a/libmount/src/libmount.h.in
+++ b/libmount/src/libmount.h.in
@@ -123,13 +123,48 @@ enum {
  *
  * See also mnt_context_get_syscall_errno() and mnt_context_get_helper_status().
  */
-#define MNT_ERR_NOFSTAB      5000	/* not found required entry in fstab */
-#define MNT_ERR_NOFSTYPE     5001	/* failed to detect filesystem type */
-#define MNT_ERR_NOSOURCE     5002	/* required mount source undefined */
-#define MNT_ERR_LOOPDEV	     5003	/* loopdev setup failed, errno set by libc */
-#define MNT_ERR_MOUNTOPT     5004	/* failed to parse/use userspace mount options */
-#define MNT_ERR_APPLYFLAGS   5005	/* failed to apply MS_PROPAGATION flags */
-#define MNT_ERR_AMBIFS       5006	/* libblkid detected more filesystems on the device */
+/**
+ * MNT_ERR_NOFSTAB:
+ *
+ * not found required entry in fstab
+ */
+#define MNT_ERR_NOFSTAB      5000
+/**
+ * MNT_ERR_NOFSTYPE:
+ *
+ * failed to detect filesystem type
+ */
+#define MNT_ERR_NOFSTYPE     5001
+/**
+ * MNT_ERR_NOSOURCE:
+ *
+ * required mount source undefined
+ */
+#define MNT_ERR_NOSOURCE     5002
+/**
+ * MNT_ERR_LOOPDEV:
+ *
+ * loopdev setup failed, errno set by libc
+ */
+#define MNT_ERR_LOOPDEV	     5003
+/**
+ * MNT_ERR_MOUNTOPT:
+ *
+ * failed to parse/use userspace mount options
+ */
+#define MNT_ERR_MOUNTOPT     5004
+/**
+ * MNT_ERR_APPLYFLAGS:
+ *
+ * failed to apply MS_PROPAGATION flags
+ */
+#define MNT_ERR_APPLYFLAGS   5005
+/**
+ * MNT_ERR_AMBIFS:
+ *
+ * libblkid detected more filesystems on the device
+ */
+#define MNT_ERR_AMBIFS       5006
 
 #ifndef __GNUC_PREREQ
 # if defined __GNUC__ && defined __GNUC_MINOR__
@@ -153,8 +188,7 @@ extern void mnt_init_debug(int mask);
 
 /* version.c */
 extern int mnt_parse_version_string(const char *ver_string)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_get_library_version(const char **ver_string);
 extern int mnt_get_library_features(const char ***features);
 
@@ -165,26 +199,20 @@ extern char *mnt_unmangle(const char *str)
 			__ul_attribute__((warn_unused_result));
 
 extern int mnt_fstype_is_netfs(const char *type)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fstype_is_pseudofs(const char *type)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_match_fstype(const char *type, const char *pattern)
 			__ul_attribute__((warn_unused_result));
 extern int mnt_match_options(const char *optstr, const char *pattern)
 			__ul_attribute__((warn_unused_result));
-extern const char *mnt_get_fstab_path(void)
-			__ul_attribute__((warn_unused_result));
-extern const char *mnt_get_swaps_path(void)
-			__ul_attribute__((warn_unused_result));
-extern const char *mnt_get_mtab_path(void)
-			__ul_attribute__((warn_unused_result));
+extern const char *mnt_get_fstab_path(void);
+extern const char *mnt_get_swaps_path(void);
+extern const char *mnt_get_mtab_path(void);
 extern int mnt_has_regular_mtab(const char **mtab, int *writable);
 extern char *mnt_get_mountpoint(const char *path)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 
 /* cache.c */
 extern struct libmnt_cache *mnt_new_cache(void)
@@ -200,8 +228,7 @@ extern int mnt_cache_device_has_tag(struct libmnt_cache *cache,
 			__ul_attribute__((nonnull));
 
 extern char *mnt_cache_find_tag_value(struct libmnt_cache *cache,
-				const char *devname, const char *token)
-			__ul_attribute__((warn_unused_result));
+				const char *devname, const char *token);
 
 extern char *mnt_get_fstype(const char *devname, int *ambi,
 			    struct libmnt_cache *cache)
@@ -263,21 +290,18 @@ extern void mnt_free_iter(struct libmnt_iter *itr);
 extern void mnt_reset_iter(struct libmnt_iter *itr, int direction)
 			__ul_attribute__((nonnull));
 extern int mnt_iter_get_direction(struct libmnt_iter *itr)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 /* optmap.c */
 enum {
 	MNT_LINUX_MAP = 1,
 	MNT_USERSPACE_MAP
 };
-extern const struct libmnt_optmap *mnt_get_builtin_optmap(int id)
-			__ul_attribute__((warn_unused_result));
+extern const struct libmnt_optmap *mnt_get_builtin_optmap(int id);
 
 /* lock.c */
 extern struct libmnt_lock *mnt_new_lock(const char *datafile, pid_t id)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern void mnt_free_lock(struct libmnt_lock *ml);
 
 extern void mnt_unlock_file(struct libmnt_lock *ml)
@@ -294,28 +318,23 @@ extern void mnt_reset_fs(struct libmnt_fs *fs)
 			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_copy_fs(struct libmnt_fs *dest,
 				     const struct libmnt_fs *src)
-			__ul_attribute__((nonnull(2)))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull(2), warn_unused_result));
 extern void *mnt_fs_get_userdata(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_userdata(struct libmnt_fs *fs, void *data);
 extern const char *mnt_fs_get_source(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_source(struct libmnt_fs *fs, const char *source);
-extern const char *mnt_fs_get_srcpath(struct libmnt_fs *fs)
-			__ul_attribute__((warn_unused_result));
+extern const char *mnt_fs_get_srcpath(struct libmnt_fs *fs);
+
 extern int mnt_fs_get_tag(struct libmnt_fs *fs, const char **name,
 			  const char **value)
 			__ul_attribute__((nonnull(1)));
 extern const char *mnt_fs_get_target(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_target(struct libmnt_fs *fs, const char *target);
 extern const char *mnt_fs_get_fstype(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_fstype(struct libmnt_fs *fs, const char *fstype);
 
 extern int mnt_fs_streq_srcpath(struct libmnt_fs *fs, const char *path)
@@ -324,14 +343,11 @@ extern int mnt_fs_streq_target(struct libmnt_fs *fs, const char *path)
 			__ul_attribute__((warn_unused_result));
 
 extern char *mnt_fs_strdup_options(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern const char *mnt_fs_get_options(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern const char *mnt_fs_get_optional_fields(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern int mnt_fs_get_propagation(struct libmnt_fs *fs, unsigned long *flags);
 
 extern int mnt_fs_set_options(struct libmnt_fs *fs, const char *optstr);
@@ -342,18 +358,14 @@ extern int mnt_fs_get_option(struct libmnt_fs *fs, const char *name,
 				char **value, size_t *valsz);
 
 extern const char *mnt_fs_get_fs_options(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern const char *mnt_fs_get_vfs_options(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern const char *mnt_fs_get_user_options(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern const char *mnt_fs_get_attributes(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_attributes(struct libmnt_fs *fs, const char *optstr);
 extern int mnt_fs_get_attribute(struct libmnt_fs *fs, const char *name,
 				char **value, size_t *valsz);
@@ -361,87 +373,65 @@ extern int mnt_fs_append_attributes(struct libmnt_fs *fs, const char *optstr);
 extern int mnt_fs_prepend_attributes(struct libmnt_fs *fs, const char *optstr);
 
 extern int mnt_fs_get_freq(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_freq(struct libmnt_fs *fs, int freq);
 extern int mnt_fs_get_passno(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_passno(struct libmnt_fs *fs, int passno);
 extern const char *mnt_fs_get_root(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_root(struct libmnt_fs *fs, const char *root);
 extern const char *mnt_fs_get_bindsrc(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_set_bindsrc(struct libmnt_fs *fs, const char *src);
 extern int mnt_fs_get_id(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_get_parent_id(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern dev_t mnt_fs_get_devno(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern pid_t mnt_fs_get_tid(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern const char *mnt_fs_get_swaptype(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern off_t mnt_fs_get_size(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern off_t mnt_fs_get_usedsize(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_get_priority(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_fs_match_target(struct libmnt_fs *fs, const char *target,
 			       struct libmnt_cache *cache)
-			__ul_attribute__((nonnull(1)))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull(1)));
 extern int mnt_fs_match_source(struct libmnt_fs *fs, const char *source,
 			       struct libmnt_cache *cache)
-			__ul_attribute__((nonnull(1)))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull(1)));
 extern int mnt_fs_match_fstype(struct libmnt_fs *fs, const char *types)
-			__ul_attribute__((nonnull(1)))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull(1)));
 extern int mnt_fs_match_options(struct libmnt_fs *fs, const char *options)
-			__ul_attribute__((nonnull(1)))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull(1)));
 extern int mnt_fs_print_debug(struct libmnt_fs *fs, FILE *file)
 			__ul_attribute__((nonnull));
 
 extern int mnt_fs_is_kernel(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_is_swaparea(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_is_netfs(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_fs_is_pseudofs(struct libmnt_fs *fs)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern void mnt_free_mntent(struct mntent *mnt);
 extern int mnt_fs_to_mntent(struct libmnt_fs *fs, struct mntent **mnt);
 
 /* tab-parse.c */
 extern struct libmnt_table *mnt_new_table_from_file(const char *filename)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern struct libmnt_table *mnt_new_table_from_dir(const char *dirname)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull, warn_unused_result));
 extern int mnt_table_parse_stream(struct libmnt_table *tb, FILE *f,
 				  const char *filename);
 extern int mnt_table_parse_file(struct libmnt_table *tb, const char *filename);
@@ -460,12 +450,10 @@ extern void mnt_free_table(struct libmnt_table *tb);
 
 extern int mnt_reset_table(struct libmnt_table *tb);
 extern int mnt_table_get_nents(struct libmnt_table *tb)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_table_set_cache(struct libmnt_table *tb, struct libmnt_cache *mpc);
 extern struct libmnt_cache *mnt_table_get_cache(struct libmnt_table *tb)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_table_add_fs(struct libmnt_table *tb, struct libmnt_fs *fs);
 extern int mnt_table_remove_fs(struct libmnt_table *tb, struct libmnt_fs *fs);
 extern int mnt_table_next_fs(struct libmnt_table *tb, struct libmnt_iter *itr,
@@ -478,29 +466,23 @@ extern int mnt_table_set_iter(struct libmnt_table *tb, struct libmnt_iter *itr,
 
 extern struct libmnt_fs *mnt_table_find_target(struct libmnt_table *tb,
 				const char *path, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_table_find_srcpath(struct libmnt_table *tb,
 				const char *path, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_table_find_tag(struct libmnt_table *tb, const char *tag,
 				const char *val, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_table_find_source(struct libmnt_table *tb,
 				const char *source, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_table_find_pair(struct libmnt_table *tb,
 				const char *source,
 				const char *target, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_table_find_devno(struct libmnt_table *tb,
 				dev_t devno, int direction)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_table_find_next_fs(struct libmnt_table *tb,
 			struct libmnt_iter *itr,
@@ -518,21 +500,17 @@ extern struct libmnt_update *mnt_new_update(void)
 extern void mnt_free_update(struct libmnt_update *upd);
 
 extern int mnt_update_is_ready(struct libmnt_update *upd)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_update_set_fs(struct libmnt_update *upd, unsigned long mountflags,
 	                      const char *target, struct libmnt_fs *fs);
 extern int mnt_update_table(struct libmnt_update *upd, struct libmnt_lock *lc);
 extern unsigned long mnt_update_get_mflags(struct libmnt_update *upd)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_update_force_rdonly(struct libmnt_update *upd, int rdonly);
 extern const char *mnt_update_get_filename(struct libmnt_update *upd)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_fs *mnt_update_get_fs(struct libmnt_update *upd)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 /* tab_diff.c */
 enum {
@@ -586,8 +564,7 @@ extern void mnt_free_context(struct libmnt_context *cxt);
 
 extern int mnt_reset_context(struct libmnt_context *cxt);
 extern int mnt_context_is_restricted(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_init_helper(struct libmnt_context *cxt,
 				   int action, int flags);
@@ -608,84 +585,63 @@ extern int mnt_context_enable_fork(struct libmnt_context *cxt, int enable);
 extern int mnt_context_disable_swapmatch(struct libmnt_context *cxt, int disable);
 
 extern int mnt_context_get_optsmode(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_lazy(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_rdonly_umount(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_sloppy(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_fake(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_nomtab(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_force(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_verbose(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_loopdel(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_nohelpers(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_nocanonicalize(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_swapmatch(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_is_fork(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_parent(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_is_child(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_wait_for_children(struct libmnt_context *cxt,
                                   int *nchildren, int *nerrs);
 
 extern int mnt_context_is_fs_mounted(struct libmnt_context *cxt,
                               struct libmnt_fs *fs, int *mounted)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_set_fs(struct libmnt_context *cxt, struct libmnt_fs *fs);
 extern struct libmnt_fs *mnt_context_get_fs(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_set_source(struct libmnt_context *cxt, const char *source);
 extern int mnt_context_set_target(struct libmnt_context *cxt, const char *target);
 extern int mnt_context_set_fstype(struct libmnt_context *cxt, const char *fstype);
 
 extern const char *mnt_context_get_source(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern const char *mnt_context_get_target(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern const char *mnt_context_get_fstype(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_set_options(struct libmnt_context *cxt, const char *optstr);
 extern int mnt_context_append_options(struct libmnt_context *cxt, const char *optstr);
 
 extern const char *mnt_context_get_options(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_set_fstype_pattern(struct libmnt_context *cxt, const char *pattern);
 extern int mnt_context_set_options_pattern(struct libmnt_context *cxt, const char *pattern);
@@ -700,8 +656,7 @@ extern int mnt_context_set_tables_errcb(struct libmnt_context *cxt,
 extern int mnt_context_set_fstab(struct libmnt_context *cxt,
 				 struct libmnt_table *tb);
 extern int mnt_context_get_fstab(struct libmnt_context *cxt,
-				 struct libmnt_table **tb)
-			__ul_attribute__((warn_unused_result));
+				 struct libmnt_table **tb);
 
 extern int mnt_context_get_mtab(struct libmnt_context *cxt,
 				struct libmnt_table **tb);
@@ -711,11 +666,9 @@ extern int mnt_context_get_table(struct libmnt_context *cxt,
 extern int mnt_context_set_cache(struct libmnt_context *cxt,
 				 struct libmnt_cache *cache);
 extern struct libmnt_cache *mnt_context_get_cache(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern struct libmnt_lock *mnt_context_get_lock(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_set_mflags(struct libmnt_context *cxt,
 				      unsigned long flags);
 extern int mnt_context_get_mflags(struct libmnt_context *cxt,
@@ -730,23 +683,18 @@ extern int mnt_context_apply_fstab(struct libmnt_context *cxt);
 
 extern int mnt_context_reset_status(struct libmnt_context *cxt);
 extern int mnt_context_get_status(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_helper_executed(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_get_helper_status(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_syscall_called(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_get_syscall_errno(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 
 extern int mnt_context_strerror(struct libmnt_context *cxt, char *buf,
 				size_t bufsiz);
@@ -779,8 +727,7 @@ extern int mnt_context_do_umount(struct libmnt_context *cxt);
 extern int mnt_context_finalize_umount(struct libmnt_context *cxt);
 
 extern int mnt_context_tab_applied(struct libmnt_context *cxt)
-			__ul_attribute__((nonnull))
-			__ul_attribute__((warn_unused_result));
+			__ul_attribute__((nonnull));
 extern int mnt_context_set_syscall_status(struct libmnt_context *cxt, int status);
 
 /*