sapi/fpm: setting backlog default to -1 for DragonFlyBSD.

like most of BSD, when negative the syscall sets it internally to
SOMAXCONN.

close GH-13077

Author: devnexen

NEWS

@@ -26,6 +26,8 @@ DOM:
 FPM:
   . Implement GH-12385 (flush headers without body when calling flush()).
     (nielsdos)
+  . Added DragonFlyBSD system to the list which set FPM_BACKLOG_DEFAULT
+    to SOMAXCONN. (David Carlier)
 
 FTP:
   . Removed the deprecated inet_ntoa call support. (David Carlier)

sapi/fpm/fpm/fpm_sockets.h

@@ -15,9 +15,10 @@
 #include "fpm_worker_pool.h"
 
 /*
-  On Linux, FreeBSD, OpenBSD and macOS, backlog negative values are truncated to SOMAXCONN
+  On Linux, FreeBSD, OpenBSD, DragonFlyBSD and macOS, backlog negative values are truncated to SOMAXCONN
 */
-#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__linux__) || defined(__APPLE__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__linux__) || \
+    defined(__DragonFly__) || defined(__APPLE__)
 #define FPM_BACKLOG_DEFAULT -1
 #else
 #define FPM_BACKLOG_DEFAULT 511