os: add os.uname()

vlib/os/os.v

@@ -1358,3 +1358,12 @@ pub fn create(path string) ?File {
 		opened: true
 	}
 }
+
+pub struct Uname {
+pub mut:
+	sysname  string
+	nodename string
+	release  string
+	version  string
+	machine  string
+}

vlib/os/os_nix.c.v

@@ -5,6 +5,7 @@ import strings
 #include <dirent.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/utsname.h>
 
 pub const (
 	path_separator = '/'
@@ -17,8 +18,32 @@ const (
 	stderr_value = 2
 )
 
+struct C.utsname {
+mut:
+	sysname  charptr
+	nodename charptr
+	release  charptr
+	version  charptr
+	machine  charptr
+}
+
+fn C.uname(name voidptr) int
 fn C.symlink(charptr, charptr) int
 
+pub fn uname() Uname {
+	mut u := Uname{}
+	d := &C.utsname( malloc(int(sizeof(C.utsname))) )
+	if C.uname(d) == 0 {
+		u.sysname = cstring_to_vstring(d.sysname)
+		u.nodename = cstring_to_vstring(d.nodename)
+		u.release = cstring_to_vstring(d.release)
+		u.version = cstring_to_vstring(d.version)
+		u.machine = cstring_to_vstring(d.machine)
+	}
+	free(d)
+	return u
+}
+
 fn init_os_args(argc int, argv &&byte) []string {
 	mut args := []string{}
 	//mut args := []string(make(0, argc, sizeof(string)))

vlib/os/os_test.v

@@ -343,3 +343,12 @@ fn test_basedir() {
 	}
 	assert os.base_dir('filename') == 'filename'
 }
+
+fn test_uname() {
+	u := os.uname()
+	assert u.sysname.len > 0
+	assert u.nodename.len > 0
+	assert u.release.len > 0
+	assert u.version.len > 0
+	assert u.machine.len > 0
+}

vlib/os/os_windows.c.v

@@ -317,7 +317,7 @@ pub:
 	// status_ constants
 	code u32
 	flags u32
-	
+
 	record &ExceptionRecord
 	address voidptr
 	param_count u32
@@ -353,3 +353,15 @@ pub fn add_vectored_exception_handler(first bool, handler VectoredExceptionHandl
 pub fn debugger_present() bool {
 	return C.IsDebuggerPresent()
 }
+
+pub fn uname() Uname {
+	// TODO: implement `os.uname()` for windows
+	unknown := 'unknown'
+	return Uname{
+		sysname: unknown
+		nodename: unknown
+		release: unknown
+		version: unknown
+		machine: unknown
+	}
+}