From 5c9598fb0f3f020478de95dc3c693e95282afba9 Mon Sep 17 00:00:00 2001
From: Stéphane Raimbault <stephane.raimbault@gmail.com>
Date: Thu, 10 Oct 2013 19:38:44 +0200
Subject: [PATCH] Use accept4 in TCP PI if available

---
 src/modbus-tcp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/modbus-tcp.c b/src/modbus-tcp.c
index dcdb208..b2c34fe 100644
--- a/src/modbus-tcp.c
+++ b/src/modbus-tcp.c
@@ -664,7 +664,12 @@ int modbus_tcp_pi_accept(modbus_t *ctx, int *s)
     }
 
     addrlen = sizeof(addr);
-    ctx->s = accept(*s, (void *)&addr, &addrlen);
+#ifdef HAVE_ACCEPT4
+    /* Inherit socket flags and use accept4 call */
+    ctx->s = accept4(*s, (struct sockaddr *)&addr, &addrlen, SOCK_CLOEXEC);
+#else
+    ctx->s = accept(*s, (struct sockaddr *)&addr, &addrlen);
+#endif
     if (ctx->s == -1) {
         close(*s);
         *s = -1;
--
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