From 17970a06477839716d008091065de75f6755819f Mon Sep 17 00:00:00 2001
From: Zhanybek <texasich@users.noreply.github.com>
Date: Thu, 7 May 2026 23:30:28 +0000
Subject: [PATCH 1/2] fix: add u_char/u_short/u_int typedefs for GCC 15 / C23
 compatibility

Under GCC 15 the default C standard is -std=gnu23 (C23), which
removes u_char, u_short, and u_int from <sys/types.h>.  The
libpcap <pcap.h> header and nethogs own decpcap.h both use these
types, causing a cascade of "unknown type name" errors.

Add compatibility typedefs guarded by #ifndef before the pcap.h
include so they are visible both to libpcap and to decpcap.h.

Fixes #287.
---
 src/decpcap.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/decpcap.h b/src/decpcap.h
index 6d2c86f..460fd5d 100644
--- a/src/decpcap.h
+++ b/src/decpcap.h
@@ -22,6 +22,19 @@
 #ifndef __DECPCAP_H
 #define __DECPCAP_H
 
+/* Compatibility typedefs — u_char/u_short/u_int were removed
+   from <sys/types.h> in C23 (GCC 15 default -std=gnu23).
+   Must come before <pcap.h> because libpcap uses these types. */
+#ifndef u_char
+typedef unsigned char u_char;
+#endif
+#ifndef u_short
+typedef unsigned short u_short;
+#endif
+#ifndef u_int
+typedef unsigned int u_int;
+#endif
+
 #include <pcap.h>
 #include <stdbool.h>
 #include <stdio.h>

From 84ee12dd0923029df536dc2761cc6cbaf0e6ac20 Mon Sep 17 00:00:00 2001
From: Zhanybek <texasich@users.noreply.github.com>
Date: Mon, 11 May 2026 14:10:44 +0000
Subject: [PATCH 2/2] docs: add upstream libpcap C23 compat issue link to
 typedef comment

Per maintainer request (PR #306), reference the upstream libpcap
issue tracking C23 compatibility for u_char/u_short/u_int types.

Upstream: https://github.com/the-tcpdump-group/libpcap/issues/1679
---
 src/decpcap.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/decpcap.h b/src/decpcap.h
index 460fd5d..a65df02 100644
--- a/src/decpcap.h
+++ b/src/decpcap.h
@@ -24,7 +24,8 @@
 
 /* Compatibility typedefs — u_char/u_short/u_int were removed
    from <sys/types.h> in C23 (GCC 15 default -std=gnu23).
-   Must come before <pcap.h> because libpcap uses these types. */
+   Must come before <pcap.h> because libpcap uses these types.
+   Upstream libpcap C23 compat: https://github.com/the-tcpdump-group/libpcap/issues/1679 */
 #ifndef u_char
 typedef unsigned char u_char;
 #endif