os: add file.Truncate

src/syscall/libc_wasip2.go

@@ -432,7 +432,6 @@ func chmod(pathname *byte, mode uint32) int32 {
 //
 //export mkdir
 func mkdir(pathname *byte, mode uint32) int32 {
-
 	path := goString(pathname)
 	dir, relPath := findPreopenForPath(path)
 	if dir.d == cm.ResourceNone {
@@ -773,7 +772,6 @@ var libcCWD wasiDir
 var wasiPreopens map[string]types.Descriptor
 
 func populatePreopens() {
-
 	var cwd string
 
 	// find CWD
@@ -1354,3 +1352,11 @@ func getcwd(buf *byte, size uint) *byte {
 	copy(s, cwd)
 	return buf
 }
+
+// int truncate(const char *path, off_t length);
+//
+//export truncate
+func truncate(path *byte, length int64) int32 {
+	libcErrno = ENOSYS
+	return -1
+}

src/syscall/syscall_libc.go

@@ -203,6 +203,15 @@ func Execve(pathname string, argv []string, envv []string) (err error) {
 	return
 }
 
+func Truncate(path string, length int64) (err error) {
+	data := cstring(path)
+	fail := int(libc_truncate(&data[0], length))
+	if fail < 0 {
+		err = getErrno()
+	}
+	return
+}
+
 func Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
 
 func Kill(pid int, sig Signal) (err error) {
@@ -451,3 +460,8 @@ func libc_fork() int32
 //
 //export execve
 func libc_execve(filename *byte, argv **byte, envp **byte) int
+
+// int truncate(const char *path, off_t length);
+//
+//export truncate
+func libc_truncate(path *byte, length int64) int32