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-rw-r--r--libcrystfel/src/utils.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/libcrystfel/src/utils.h b/libcrystfel/src/utils.h
index b5f07f26..39ee8848 100644
--- a/libcrystfel/src/utils.h
+++ b/libcrystfel/src/utils.h
@@ -206,7 +206,10 @@ enum log_msg_type {
extern void STATUS(const char *format, ...);
extern void ERROR(const char *format, ...);
-extern void set_log_message_func(void (*new_log_msg_func)(enum log_msg_type type, const char *));
+typedef void (*LogMsgFunc)(enum log_msg_type type, const char *msg, void *vp);
+
+extern void set_log_message_func(LogMsgFunc new_log_msg_func,
+ void *vp);
/* ------------------------------ File handling ----------------------------- */