if using readline , the CTRL-C should now handle it a bit more nicer. Especially the pm3 history file should be flushed with the upside you dont loose all your commands you issued and mistakingly pressed CTRL-C. for the linenoice and Win32, you still have this issue.

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Changed client now handles CTRL-C and saves history if using READLINE (@iceman1001)
 - Changed `hf mf *` - printing of keys if MFC EV1 added extra explaination (@iceman1001)
 - Changed `hf mf ginfo - now supports decoding of user supplied configuration block (@iceman1001)
 - Changed `data load` - now shows loaded number as comma printed. (@iceman1001)

client/src/pm3line.c

@@ -123,10 +123,20 @@ static bool WINAPI terminate_handler(DWORD t) {
 #  else
 static struct sigaction gs_old_sigint_action;
 static void sigint_handler(int signum) {
+
+    switch(signum) {
+        case SIGINT: {
             sigaction(SIGINT, &gs_old_sigint_action, NULL);
             pm3line_flush_history();
             kill(0, SIGINT);
+            break;
         }
+        default: {
+            break;
+        }
+    }
+}
+
 #endif
 
 void pm3line_install_signals(void) {
@@ -138,6 +148,7 @@ void pm3line_install_signals(void) {
     action.sa_handler = &sigint_handler;
     sigaction(SIGINT, &action, &gs_old_sigint_action);
 #  endif
+
 #if defined(HAVE_READLINE)
     rl_catch_signals = 1;
     rl_set_signals();
@@ -150,6 +161,8 @@ void pm3line_init(void) {
     using_history();
     rl_readline_name = "PM3";
     rl_attempted_completion_function = rl_command_completion;
+    rl_getc_function = getc;
+    pm3line_install_signals();
 
 #ifdef RL_STATE_READCMD
     rl_extend_line_buffer(1024);