Add FreeBSD targets, get gb.h working with FreeBSD, fix odin_root_directory function for FreeBSD and a few other operating systems not yet added

3 files changed, 125 insertions, 2 deletions

diff --git a/src/build_settings.cpp b/src/build_settings.cpp
index d6ac55ac8..b9968019c 100644
--- a/src/build_settings.cpp
+++ b/src/build_settings.cpp
@@ -1,3 +1,8 @@
+#if defined(GB_SYSTEM_FREEBSD)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
 enum TargetOsKind {
 	TargetOs_Invalid,
 
@@ -6,6 +11,7 @@ enum TargetOsKind {
 	TargetOs_linux,
 	TargetOs_essence,
 	TargetOs_js,
+	TargetOs_freebsd,
 
 	TargetOs_COUNT,
 };
@@ -36,6 +42,7 @@ String target_os_names[TargetOs_COUNT] = {
 	str_lit("linux"),
 	str_lit("essence"),
 	str_lit("js"),
+	str_lit("freebsd"),
 };
 
 String target_arch_names[TargetArch_COUNT] = {
@@ -204,6 +211,23 @@ gb_global TargetMetrics target_darwin_amd64 = {
 	str_lit("e-m:o-i64:64-f80:128-n8:16:32:64-S128"),
 };
 
+gb_global TargetMetrics target_freebsd_386 = {
+	TargetOs_freebsd,
+	TargetArch_386,
+	4,
+	8,
+	str_lit("i386-unknown-freebsd"),
+};
+
+gb_global TargetMetrics target_freebsd_amd64 = {
+	TargetOs_freebsd,
+	TargetArch_386,
+	8,
+	16,
+	str_lit("x86_64-unknown-freebsd"),
+	str_lit("e-m:w-i64:64-f80:128-n8:16:32:64-S128"),
+};
+
 gb_global TargetMetrics target_essence_amd64 = {
 	TargetOs_essence,
 	TargetArch_amd64,
@@ -235,6 +259,8 @@ gb_global NamedTargetMetrics named_targets[] = {
 	{ str_lit("linux_amd64"),   &target_linux_amd64 },
 	{ str_lit("windows_386"),   &target_windows_386 },
 	{ str_lit("windows_amd64"), &target_windows_amd64 },
+	{ str_lit("freebsd_386"),   &target_freebsd_386 },
+	{ str_lit("freebsd_amd64"), &target_freebsd_amd64 },
 };
 
 NamedTargetMetrics *selected_target_metrics;
@@ -476,7 +502,21 @@ String odin_root_dir(void) {
 		// of this compiler, it should be _good enough_.
 		// That said, there's no solid 100% method on Linux to get the program's
 		// path without checking this link. Sorry.
+#if defined(GB_SYSTEM_FREEBSD)
+		int mib[4];
+		mib[0] = CTL_KERN;
+		mib[1] = KERN_PROC;
+		mib[2] = KERN_PROC_PATHNAME;
+		mib[3] = -1;
+		len = path_buf.count;
+		sysctl(mib, 4, &path_buf[0], (size_t *) &len, NULL, 0);
+#elif defined(GB_SYSTEM_NETBSD)
+		len = readlink("/proc/curproc/exe", &path_buf[0], path_buf.count);
+#elif defined(GB_SYSTEM_DRAGONFLYBSD)
+		len = readlink("/proc/curproc/file", &path_buf[0], path_buf.count);
+#else
 		len = readlink("/proc/self/exe", &path_buf[0], path_buf.count);
+#endif
 		if(len == 0) {
 			return make_string(nullptr, 0);
 		}
diff --git a/src/common.cpp b/src/common.cpp
index 3b726dacd..8d2802b1f 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -954,7 +954,7 @@ ReadDirectoryError read_directory(String path, Array<FileInfo> *fi) {
 
 	return ReadDirectory_None;
 }
-#elif defined(GB_SYSTEM_LINUX) || defined(GB_SYSTEM_OSX)
+#elif defined(GB_SYSTEM_LINUX) || defined(GB_SYSTEM_OSX) || defined(GB_SYSTEM_FREEBSD)
 
 #include <dirent.h>
 
diff --git a/src/gb/gb.h b/src/gb/gb.h
index afebcd0d8..848f27628 100644
--- a/src/gb/gb.h
+++ b/src/gb/gb.h
@@ -317,7 +317,7 @@ extern "C" {
 	#endif
 	#include <stdlib.h> // NOTE(bill): malloc on linux
 	#include <sys/mman.h>
-	#if !defined(GB_SYSTEM_OSX)
+	#if !defined(GB_SYSTEM_OSX) && !defined(__FreeBSD__)
 		#include <sys/sendfile.h>
 	#endif
 	#include <sys/stat.h>
@@ -342,6 +342,17 @@ extern "C" {
 	#include <mach/clock.h>
 #endif
 
+#if defined(GB_SYSTEM_FREEBSD)
+	#include <sys/sysctl.h>
+	#include <pthread_np.h>
+	#include <sys/cpuset.h>
+	#include <sys/types.h>
+	#include <sys/socket.h>
+	#include <sys/uio.h>
+	#define lseek64 lseek
+	#define sendfile(out, in, offset, count) sendfile(out, in, offset, count, NULL, NULL, 0)
+#endif
+
 #if defined(GB_SYSTEM_UNIX)
 	#include <semaphore.h>
 #endif
@@ -1046,6 +1057,13 @@ typedef struct gbAffinity {
 	isize thread_count;
 	isize threads_per_core;
 } gbAffinity;
+#elif defined(GB_SYSTEM_FREEBSD)
+typedef struct gbAffinity {
+	b32 is_accurate;
+	isize core_count;
+	isize thread_count;
+	isize threads_per_core;
+} gbAffinity;
 #else
 #error TODO(bill): Unknown system
 #endif
@@ -4805,6 +4823,8 @@ void gb_thread_set_name(gbThread *t, char const *name) {
 #elif defined(GB_SYSTEM_OSX)
 	// TODO(bill): Test if this works
 	pthread_setname_np(name);
+#elif defined(GB_SYSTEM_FREEBSD)
+	pthread_set_name_np(t->posix_handle, name);
 #else
 	// TODO(bill): Test if this works
 	pthread_setname_np(t->posix_handle, name);
@@ -5090,6 +5110,69 @@ isize gb_affinity_thread_count_for_core(gbAffinity *a, isize core) {
 	return a->threads_per_core;
 }
 
+#elif defined(GB_SYSTEM_FREEBSD)
+#include <stdio.h>
+
+void gb_affinity_init(gbAffinity *a) {
+	usize count = 0;
+	usize count_size = sizeof(count);
+
+	a->is_accurate      = false;
+	a->thread_count     = 1;
+	a->core_count       = 1;
+	a->threads_per_core = 1;
+
+	if (sysctlbyname("hw.logicalcpu", &count, &count_size, NULL, 0) == 0) {
+		if (count > 0) {
+			a->thread_count = count;
+			// Get # of physical cores
+			if (sysctlbyname("hw.physicalcpu", &count, &count_size, NULL, 0) == 0) {
+				if (count > 0) {
+					a->core_count = count;
+					a->threads_per_core = a->thread_count / count;
+					if (a->threads_per_core < 1)
+						a->threads_per_core = 1;
+					else
+						a->is_accurate = true;
+				}
+			}
+		}
+	}
+
+}
+
+void gb_affinity_destroy(gbAffinity *a) {
+	gb_unused(a);
+}
+
+b32 gb_affinity_set(gbAffinity *a, isize core, isize thread_index) {
+	isize index;
+	pthread_t thread;
+
+	int result;
+
+	GB_ASSERT(core < a->core_count);
+	GB_ASSERT(thread_index < a->threads_per_core);
+
+	index = core * a->threads_per_core + thread_index;
+	thread = pthread_self();
+	
+
+	cpuset_t mn;
+	CPU_ZERO(&mn);
+	CPU_SET(size_t(index), &mn);
+	//info.affinity_tag = cast(integer_t)index;
+	//result = thread_policy_set(thread, THREAD_AFFINITY_POLICY, cast(thread_policy_t)&info, THREAD_AFFINITY_POLICY_COUNT);
+
+	result = pthread_setaffinity_np(thread, sizeof(cpuset_t), &mn);
+	return result == 0;
+}
+
+isize gb_affinity_thread_count_for_core(gbAffinity *a, isize core) {
+	GB_ASSERT(core >= 0 && core < a->core_count);
+	return a->threads_per_core;
+}
+
 #elif defined(GB_SYSTEM_LINUX)
 // IMPORTANT TODO(bill): This gbAffinity stuff for linux needs be improved a lot!
 // NOTE(zangent): I have to read /proc/cpuinfo to get the number of threads per core.