posix: add package

core/prof/spall/spall_unix.odin

@@ -5,22 +5,7 @@ package spall
 // Only for types.
 import "core:os"
 
-when ODIN_OS == .Darwin {
-	foreign import libc "system:System.framework"
-} else {
-	foreign import libc "system:c"
-}
-
-timespec :: struct {
-	tv_sec:  i64, // seconds
-	tv_nsec: i64, // nanoseconds
-}
-
-foreign libc {
-	__error :: proc() -> ^i32 ---
-	@(link_name="write")         _unix_write         :: proc(handle: os.Handle, buffer: rawptr, count: uint) -> int ---
-	@(link_name="clock_gettime") _unix_clock_gettime :: proc(clock_id: u64, timespec: ^timespec) -> i32 ---
-}
+import "core:sys/posix"
 
 MAX_RW :: 0x7fffffff
 
@@ -32,7 +17,7 @@ _write :: proc "contextless" (fd: os.Handle, data: []byte) -> (n: int, err: os.E
 
 	for n < len(data) {
 		chunk := data[:min(len(data), MAX_RW)]
-		written := _unix_write(fd, raw_data(chunk), len(chunk))
+		written := posix.write(posix.FD(fd), raw_data(chunk), len(chunk))
 		if written < 0 {
 			return n, os.get_last_error()
 		}
@@ -42,11 +27,17 @@ _write :: proc "contextless" (fd: os.Handle, data: []byte) -> (n: int, err: os.E
 	return n, nil
 }
 
-CLOCK_MONOTONIC_RAW :: 4 // NOTE(tetra): "RAW" means: Not adjusted by NTP.
+// NOTE(tetra): "RAW" means: Not adjusted by NTP.
+when ODIN_OS == .Darwin {
+	CLOCK :: posix.Clock(4) // CLOCK_MONOTONIC_RAW
+} else {
+	// It looks like the BSDs don't have a CLOCK_MONOTONIC_RAW equivalent.
+	CLOCK :: posix.Clock.MONOTONIC
+}
 
 @(no_instrumentation)
 _tick_now :: proc "contextless" () -> (ns: i64) {
-	t: timespec
-	_unix_clock_gettime(CLOCK_MONOTONIC_RAW, &t)
-	return t.tv_sec*1e9 + t.tv_nsec
+	t: posix.timespec
+	posix.clock_gettime(CLOCK, &t)
+	return i64(t.tv_sec)*1e9 + i64(t.tv_nsec)
 }