From ec8e547be135cc638db3615c9335fb3d04caf17f Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Mon, 26 Oct 2020 05:27:10 +0000
Subject: [PATCH] main: don't renice as non-root on non-Linux

On BSD systems only the super-user may lower priority values.

meson.build:40:0: ERROR: Dependency "libcap" not found, tried pkgconfig and cmake

src/main.cpp:7:10: fatal error: 'sys/capability.h' file not found
 #include <sys/capability.h>
          ^~~~~~~~~~~~~~~~~~
src/main.cpp:244:2: error: unknown type name 'cap_t'
        cap_t caps = cap_get_proc();
        ^
src/main.cpp:244:15: error: use of undeclared identifier 'cap_get_proc'
        cap_t caps = cap_get_proc();
                     ^
src/main.cpp:247:3: error: unknown type name 'cap_flag_value_t'
                cap_flag_value_t nicecapvalue = CAP_CLEAR;
                ^
src/main.cpp:247:35: error: use of undeclared identifier 'CAP_CLEAR'
                cap_flag_value_t nicecapvalue = CAP_CLEAR;
                                                ^
src/main.cpp:248:23: error: use of undeclared identifier 'CAP_SYS_NICE'
                cap_get_flag( caps, CAP_SYS_NICE, CAP_EFFECTIVE, &nicecapvalue );
                                    ^
src/main.cpp:248:37: error: use of undeclared identifier 'CAP_EFFECTIVE'
                cap_get_flag( caps, CAP_SYS_NICE, CAP_EFFECTIVE, &nicecapvalue );
                                                  ^
src/main.cpp:250:24: error: use of undeclared identifier 'CAP_SET'
                if ( nicecapvalue == CAP_SET )
                                     ^
---
 meson.build  | 2 +-
 src/main.cpp | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index e7251ec043..957d9f0e55 100644
--- a/meson.build
+++ b/meson.build
@@ -37,7 +37,7 @@ wayland_server = dependency('wayland-server')
 wayland_protos = dependency('wayland-protocols', version: '>=1.17')
 xkbcommon = dependency('xkbcommon')
 thread_dep = dependency('threads')
-cap_dep = dependency('libcap')
+cap_dep = dependency('libcap', required: false)
 sdl_dep = dependency('SDL2')
 pipewire_dep = dependency('libpipewire-0.3', required: get_option('pipewire'))
 
diff --git a/src/main.cpp b/src/main.cpp
index 08d9e15846..7298f7b30d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,7 +4,9 @@
 #include <mutex>
 #include <vector>
 #include <cstring>
+#if defined(__linux__)
 #include <sys/capability.h>
+#endif
 #include <sys/stat.h>
 
 #include <getopt.h>
@@ -241,6 +243,7 @@ int main(int argc, char **argv)
 		}
 	}
 
+#if defined(__linux__)
 	cap_t caps = cap_get_proc();
 	if ( caps != nullptr )
 	{
@@ -271,6 +274,7 @@ int main(int argc, char **argv)
 	{
 		fprintf( stderr, "No CAP_SYS_NICE, falling back to regular-priority compute and threads.\nPerformance will be affected.\n" );
 	}
+#endif
 
 	if ( gpuvis_trace_init() != -1 )
 	{