1 files changed, 12 insertions, 5 deletions
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 53bc3ad6593e..3479f54d7957 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -28,13 +28,20 @@
 #include "errno.h"
 #include "types.h"
 
-/* Syscall return helper, set errno as -ret when ret < 0 */
+
+/* Syscall return helper for library routines, set errno as -ret when ret is in
+ * range of [-MAX_ERRNO, -1]
+ *
+ * Note, No official reference states the errno range here aligns with musl
+ * (src/internal/syscall_ret.c) and glibc (sysdeps/unix/sysv/linux/sysdep.h)
+ */
+
 static __inline__ __attribute__((unused, always_inline))
-long __sysret(long ret)
+long __sysret(unsigned long ret)
 {
-	if (ret < 0) {
-		SET_ERRNO(-ret);
-		ret = -1;
+	if (ret >= (unsigned long)-MAX_ERRNO) {
+		SET_ERRNO(-(long)ret);
+		return -1;
 	}
 	return ret;
 }