3 files changed, 19 insertions, 15 deletions

diff --git a/dev/main.c b/dev/main.c
index cf7dbaa..33ebc2d 100644
--- a/dev/main.c
+++ b/dev/main.c
@@ -128,7 +128,7 @@ int main(int argc, char *argv[])
                         afc_open_file(afc, "/com.apple.itunes.lock_sync", AFC_FOPEN_RW, &lockfile);
                         if (lockfile) {
                                 printf("locking file\n");
-                                afc_lock_file(afc, lockfile, 2 | 4);
+                                afc_lock_file(afc, lockfile, AFC_LOCK_EX);
 
                                 perform_notification(phone, client, NP_SYNC_DID_START);
                         }
@@ -227,7 +227,7 @@ int main(int argc, char *argv[])
                         //perform_notification(phone, control, NP_SYNC_DID_FINISH);
 
                         printf("XXX unlocking file\n");
-                        afc_lock_file(afc, lockfile, 8 | 4);
+                        afc_lock_file(afc, lockfile, AFC_LOCK_UN);
 
                         printf("XXX closing file\n");
                         afc_close_file(afc, lockfile);
diff --git a/include/libiphone/afc.h b/include/libiphone/afc.h
index 2a0bbad..b64510b 100644
--- a/include/libiphone/afc.h
+++ b/include/libiphone/afc.h
@@ -21,6 +21,12 @@ typedef enum {
         AFC_SYMLINK = 2
 } afc_link_type_t;
 
+typedef enum {
+        AFC_LOCK_SH = 1 | 4, // shared lock
+        AFC_LOCK_EX = 2 | 4, // exclusive lock
+        AFC_LOCK_UN = 8 | 4  // unlock
+} afc_lock_op_t;
+
 struct afc_client_int;
 typedef struct afc_client_int *afc_client_t;
 
@@ -36,7 +42,7 @@ iphone_error_t afc_get_dir_list ( afc_client_t client, const char *dir, char ***
 iphone_error_t afc_get_file_info ( afc_client_t client, const char *filename, char ***infolist );
 iphone_error_t afc_open_file ( afc_client_t client, const char *filename, afc_file_mode_t file_mode, uint64_t *handle );
 iphone_error_t afc_close_file ( afc_client_t client, uint64_t handle);
-iphone_error_t afc_lock_file ( afc_client_t client, uint64_t handle, int operation);
+iphone_error_t afc_lock_file ( afc_client_t client, uint64_t handle, afc_lock_op_t operation);
 iphone_error_t afc_read_file ( afc_client_t client, uint64_t handle, char *data, int length, uint32_t *bytes);
 iphone_error_t afc_write_file ( afc_client_t client, uint64_t handle, const char *data, int length, uint32_t *bytes);
 iphone_error_t afc_seek_file ( afc_client_t client, uint64_t handle, int64_t offset, int whence);
diff --git a/src/AFC.c b/src/AFC.c
index e666c45..cd120fc 100644
--- a/src/AFC.c
+++ b/src/AFC.c
@@ -174,6 +174,9 @@ static int afcerror_to_errno(int afcerror)
                 case 10: // occurs if you try to open a file without permission
                         res = EPERM;
                         break;
+                case 19: // occurs if you try to lock an already locked file
+                        res = EWOULDBLOCK;
+                        break;
                 default: // we'll assume it's an errno value, but report it
                         log_debug_msg("WARNING: unknown AFC error %d, perhaps it's '%s'?\n", afcerror, strerror(afcerror));
                         res = afcerror;
@@ -986,21 +989,16 @@ iphone_error_t afc_close_file(afc_client_t client, uint64_t handle)
 
 /** Locks or unlocks a file on the phone. 
  *
- * makes use of flock, see
+ * makes use of flock on the device, see
  * http://developer.apple.com/documentation/Darwin/Reference/ManPages/man2/flock.2.html
  *
- * operation (same as in sys/file.h on linux):
- *
- * LOCK_SH   1    // shared lock
- * LOCK_EX   2   // exclusive lock
- * LOCK_NB   4   // don't block when locking
- * LOCK_UN   8   // unlock
- *
- * @param client The client to close the file with.
+ * @param client The client to lock the file with.
  * @param handle File handle of a previously opened file.
- * @operation the lock or unlock operation to perform.
+ * @param operation the lock or unlock operation to perform, this is one of
+ *        AFC_LOCK_SH (shared lock), AFC_LOCK_EX (exclusive lock),
+ *        or AFC_LOCK_UN (unlock).
  */
-iphone_error_t afc_lock_file(afc_client_t client, uint64_t handle, int operation)
+iphone_error_t afc_lock_file(afc_client_t client, uint64_t handle, afc_lock_op_t operation)
 {
         if (!client || (handle == 0))
                 return IPHONE_E_INVALID_ARG;
@@ -1024,7 +1022,7 @@ iphone_error_t afc_lock_file(afc_client_t client, uint64_t handle, int operation
 
         if (bytes <= 0) {
                 afc_unlock(client);
-                log_debug_msg("fuck\n");
+                log_debug_msg("Could not send lock command\n");
                 return IPHONE_E_UNKNOWN_ERROR;
         }
         // Receive the response