libmount: add special MNT_ERR_ codes

... to detect some situations where standard -errno is too generic.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/libmount/src/libmount.h.in b/libmount/src/libmount.h.in
index 6b347f98f..c88722a9d 100644
--- a/libmount/src/libmount.h.in
+++ b/libmount/src/libmount.h.in
@@ -115,6 +115,18 @@ enum {
 	MNT_ACT_UMOUNT
 };
 
+/*
+ * Errors -- by default libmount returns -errno for generic errors (ENOMEM,
+ * EINVAL, ...) and for mount(2) errors, but for some specific operations it
+ * returns private error codes. Note that maximum system errno value should be
+ * 4095 on UNIXes.
+ *
+ * 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 */
+
 /* init.c */
 extern void mnt_init_debug(int mask);