From 6a35a902c5ac2bbed756f599504a460555cca984 Mon Sep 17 00:00:00 2001
From: Vladimir Dubrovin <3proxy@3proxy.ru>
Date: Fri, 23 Oct 2026 16:56:09 +0300
Subject: [PATCH] SIGPIPE ignored before any service starts, and in standalone
 services

3proxy ignored SIGPIPE only after readconfig(), which starts the
services: a client gone while written to in the meantime killed the
process (as auto's case saw on macOS). Standalone services never ignored
it. Sends pass no MSG_NOSIGNAL, so this is the only guard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/3proxy.c    | 6 +++++-
 src/proxymain.c | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/3proxy.c b/src/3proxy.c
index d3f3af2..91415ef 100644
--- a/src/3proxy.c
+++ b/src/3proxy.c
@@ -511,6 +511,11 @@ int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int
 	return 1;
   }
 
+#ifndef _WIN32
+  /* before readconfig() starts the services: a client gone while it is
+     written to is an error, not the end */
+  signal(SIGPIPE, SIG_IGN);
+#endif
   _3proxy_mutex_init(&config_mutex);
   _3proxy_mutex_init(&bandlim_mutex);
   _3proxy_mutex_init(&connlim_mutex);
@@ -561,7 +566,6 @@ int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int
 	 signal(SIGCONT, mysigpause);
 	 signal(SIGTERM, mysigterm);
 	 signal(SIGUSR1, mysigusr1);
-	 signal(SIGPIPE, SIG_IGN);
 	 cyclestep();
 
 #endif
diff --git a/src/proxymain.c b/src/proxymain.c
index 03c65ed..d6922a5 100644
--- a/src/proxymain.c
+++ b/src/proxymain.c
@@ -418,6 +418,9 @@ int MODULEMAINFUNC (int argc, char** argv){
  WSADATA wd;
  WSAStartup(MAKEWORD( 1, 1 ), &wd);
 
+#else
+ /* a client gone while it is written to is an error, not the end */
+ signal(SIGPIPE, SIG_IGN);
 #endif
 
 #endif