From f7940c9cdf872d7504aca9637e9fd14328b2b726 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 19 Apr 2022 11:26:10 +0800
Subject: [PATCH] exit-status: introduce EXIT_EXCEPTION mapping to 255

---
 src/basic/exit-status.c | 9 ++++++---
 src/basic/exit-status.h | 1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/basic/exit-status.c b/src/basic/exit-status.c
index 0a7a53b..8b67d44 100644
--- a/src/basic/exit-status.c
+++ b/src/basic/exit-status.c
@@ -19,9 +19,9 @@ const char* exit_status_to_string(int status, ExitStatusLevel level) {
          *  79…199 │ (Currently unmapped)
          * 200…241 │ systemd's private error codes (might be extended to 254 in future development)
          * 242…254 │ (Currently unmapped, but see above)
-         *   255   │ (We should probably stay away from that one, it's frequently used by applications to indicate an
-         *         │ exit reason that cannot really be expressed in a single exit status value — such as a propagated
-         *         │ signal or such)
+	 *   255   │ EXIT_EXCEPTION (We use this to propagate exit-by-signal events. It's frequently used by others apps (like bash)
+	 *         │ to indicate exit reason that cannot really be expressed in a single exit status value — such as a propagated
+	 *         │ signal or such, and we follow that logic here.)
          */
 
         switch (status) {  /* We always cover the ISO C ones */
@@ -158,6 +158,9 @@ const char* exit_status_to_string(int status, ExitStatusLevel level) {
 
                 case EXIT_NUMA_POLICY:
                         return "NUMA_POLICY";
+
+		case EXIT_EXCEPTION:
+			return "EXCEPTION";
                 }
         }
 
diff --git a/src/basic/exit-status.h b/src/basic/exit-status.h
index dc284aa..e923247 100644
--- a/src/basic/exit-status.h
+++ b/src/basic/exit-status.h
@@ -70,6 +70,7 @@ enum {
         EXIT_LOGS_DIRECTORY, /* 240 */
         EXIT_CONFIGURATION_DIRECTORY,
         EXIT_NUMA_POLICY,
+	EXIT_EXCEPTION = 255,  /* Whenever we want to propagate an abnormal/signal exit, in line with bash */
 };
 
 typedef enum ExitStatusLevel {
-- 
2.27.0