MEDIUM: errors: implement user messages buffer

The user messages buffer is used to store the stderr output after the
starting is over. Each thread has it own user messages buffer. Add some
functions to add a new message, retrieve and clear the content.

The user messages buffer primary goal is to be consulted by CLI
handlers. Each handlers using it must clear the buffer before starting
its operation.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/haproxy/errors.h b/include/haproxy/errors.h
index 629b7209a..aaf5cd866 100644
--- a/include/haproxy/errors.h
+++ b/include/haproxy/errors.h
@@ -60,6 +60,10 @@ enum {
 };
 
 
+void usermsgs_clr(void);
+int usermsgs_empty(void);
+const char *usermsgs_str(void);
+
 /************ Error reporting functions ***********/
 
 /*