redirect: Start skeleton for new liblsi-redirect

We're left in the awkward position that there are some games that **still**
misbehave on Linux, and generally do Dumb Things. So to get around the fact
that some vendors basically stopped caring about us, we'll create a special
`LD_PRELOAD` library that is responsible for redirecting syscalls to basically
monkeypatch broken behaviour completely.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

meson.build

@@ -58,6 +58,11 @@ if with_libintercept == true
     cdata.set('HAVE_LIBINTERCEPT', '1')
 endif
 
+with_libredirect = get_option('with-libredirect')
+if with_libredirect == true
+    cdata.set('HAVE_LIBREDIRECT', '1')
+endif
+
 with_frontend = get_option('with-frontend')
 
 if get_option('with-new-libcxx-abi') == true

meson_options.txt

@@ -5,4 +5,5 @@ option('with-frontend', type: 'boolean', description: 'Build the LSI Settings UI
 option('with-preload-libs', type: 'string', description: 'Colon separated list of libraries required to launch Steam games',
         value: '/usr/\$LIB/libxcb.so.1:/usr/\$LIB/libX11.so.6:/usr/\$LIB/libstdc++.so.6')
 option('with-libintercept', type: 'boolean', description: 'Enable libintercept library for controlling Steam linking', value: true)
+option('with-libredirect', type: 'boolean', description: 'Enable libredirect library for fine-tuning Steam games', value: true)
 option('with-new-libcxx-abi', type: 'boolean', description: 'Enable when using the new libstdc++ ABI', value: false)

src/meson.build

@@ -19,4 +19,5 @@ nica_includes = [
 subdir('lsi')
 subdir('frontend')
 subdir('intercept')
+subdir('redirect')
 subdir('shim')

src/redirect/main.c

@@ -0,0 +1,38 @@
+/*
+ * This file is part of linux-steam-integration.
+ *
+ * Copyright © 2017 Ikey Doherty <ikey@solus-project.com>
+ *
+ * linux-steam-integration is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+
+__attribute__((constructor)) static void lsi_redirect_init(void)
+{
+        fprintf(stderr, "Loading lsi_redirect\n");
+}
+
+__attribute__((destructor)) static void lsi_redirect_unload(void)
+{
+        fprintf(stderr, "Unloading lsi_redirect\n");
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 expandtab:
+ * :indentSize=8:tabSize=8:noTabs=true:
+ */

src/redirect/meson.build

@@ -0,0 +1,15 @@
+# Only build libintercept if told to!
+
+if with_libredirect == true
+
+    redirect_sources = [
+        'main.c',
+    ]
+
+    main_redirect = shared_library(
+        'lsi-redirect',
+        sources: redirect_sources,
+        c_args: ['-fvisibility=hidden'],
+        install: true,
+    )
+endif