diff --git a/src/iperf_api.c b/src/iperf_api.c
index 6fbd79f84..10d360c75 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -4874,8 +4874,10 @@ iperf_catch_sigend(void (*handler)(int))
  * before cleaning up and exiting.
  */
 void
-iperf_got_sigend(struct iperf_test *test)
+iperf_got_sigend(struct iperf_test *test, int sig)
 {
+    int exit_normal;
+
     /*
      * If we're the client, or if we're a server and running a test,
      * then dump out the accumulated stats so far.
@@ -4897,7 +4899,25 @@ iperf_got_sigend(struct iperf_test *test)
 	(void) Nwrite(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp);
     }
     i_errno = (test->role == 'c') ? IECLIENTTERM : IESERVERTERM;
-    iperf_errexit(test, "interrupt - %s", iperf_strerror(i_errno));
+
+    exit_normal = 0;
+#ifdef SIGTERM
+    if (sig == SIGTERM)
+        exit_normal = 1;
+#endif
+#ifdef SIGINT
+    if (sig == SIGINT)
+        exit_normal = 1;
+#endif
+#ifdef SIGHUP
+    if (sig == SIGHUP)
+        exit_normal = 1;
+#endif
+    if (exit_normal) {
+        iperf_signormalexit(test, "interrupt - %s by signal %s(%d)", iperf_strerror(i_errno), strsignal(sig), sig);
+    } else {
+        iperf_errexit(test, "interrupt - %s by signal %s(%d)", iperf_strerror(i_errno), strsignal(sig), sig);
+    }
 }
 
 /* Try to write a PID file if requested, return -1 on an error. */
diff --git a/src/iperf_api.h b/src/iperf_api.h
index 471cc9032..55e1aa626 100644
--- a/src/iperf_api.h
+++ b/src/iperf_api.h
@@ -327,7 +327,7 @@ void iperf_check_throttle(struct iperf_stream *sp, struct iperf_time *nowP);
 int iperf_send_mt(struct iperf_stream *) /* __attribute__((hot)) */;
 int iperf_recv_mt(struct iperf_stream *);
 void iperf_catch_sigend(void (*handler)(int));
-void iperf_got_sigend(struct iperf_test *test) __attribute__ ((noreturn));
+void iperf_got_sigend(struct iperf_test *test, int sig) __attribute__ ((noreturn));
 void usage(void);
 void usage_long(FILE * f);
 void warning(const char *);
@@ -381,6 +381,8 @@ int iflush(struct iperf_test *test);
 /* Error routines. */
 void iperf_err(struct iperf_test *test, const char *format, ...) __attribute__ ((format(printf,2,3)));
 void iperf_errexit(struct iperf_test *test, const char *format, ...) __attribute__ ((format(printf,2,3),noreturn));
+void iperf_signormalexit(struct iperf_test *test, const char *format, ...) __attribute__ ((format(printf,2,3),noreturn));
+void iperf_exit(struct iperf_test *test, int exit_code, const char *format, va_list argp) __attribute__ ((noreturn));
 char *iperf_strerror(int);
 extern int i_errno;
 enum {
diff --git a/src/iperf_error.c b/src/iperf_error.c
index d0da8e8af..34bbb1290 100644
--- a/src/iperf_error.c
+++ b/src/iperf_error.c
@@ -85,11 +85,30 @@ iperf_err(struct iperf_test *test, const char *format, ...)
     va_end(argp);
 }
 
-/* Do a printf to stderr or log file as appropriate, then exit. */
+/* Do a printf to stderr or log file as appropriate, then exit(0). */
+void
+iperf_signormalexit(struct iperf_test *test, const char *format, ...)
+{
+    va_list argp;
+
+    va_start(argp, format);
+    iperf_exit(test, 0, format, argp);
+}
+
+/* Do a printf to stderr or log file as appropriate, then exit(1). */
 void
 iperf_errexit(struct iperf_test *test, const char *format, ...)
 {
     va_list argp;
+
+    va_start(argp, format);
+    iperf_exit(test, 1, format, argp);
+}
+
+/* Do a printf to stderr or log file as appropriate, then exit. */
+void
+iperf_exit(struct iperf_test *test, int exit_code, const char *format, va_list argp)
+{
     char str[1000];
     time_t now;
     struct tm *ltm = NULL;
@@ -103,7 +122,6 @@ iperf_errexit(struct iperf_test *test, const char *format, ...)
 	ct = iperf_timestrerr;
     }
 
-    va_start(argp, format);
     vsnprintf(str, sizeof(str), format, argp);
     if (test != NULL && test->json_output) {
         if (test->json_top != NULL) {
@@ -136,7 +154,7 @@ iperf_errexit(struct iperf_test *test, const char *format, ...)
     va_end(argp);
     if (test)
         iperf_delete_pidfile(test);
-    exit(1);
+    exit(exit_code);
 }
 
 int i_errno;
diff --git a/src/main.c b/src/main.c
index eb29f87ac..708fd4f4c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -131,10 +131,12 @@ main(int argc, char **argv)
 
 
 static jmp_buf sigend_jmp_buf;
+static int signed_sig;
 
 static void __attribute__ ((noreturn))
 sigend_handler(int sig)
 {
+    signed_sig = sig;
     longjmp(sigend_jmp_buf, 1);
 }
 
@@ -145,7 +147,7 @@ run(struct iperf_test *test)
     /* Termination signals. */
     iperf_catch_sigend(sigend_handler);
     if (setjmp(sigend_jmp_buf))
-	iperf_got_sigend(test);
+	iperf_got_sigend(test, signed_sig);
 
     /* Ignore SIGPIPE to simplify error handling */
     signal(SIGPIPE, SIG_IGN);