LibCore: Add System::sleep_ms

Author: https://github.com/stasoid
Commit: https://github.com/LadybirdBrowser/ladybird/commit/a291a7f7706
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2917
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibCore/System.cpp

@@ -1010,4 +1010,11 @@ bool is_socket(int fd)
     return !result.is_error() && S_ISSOCK(result.value().st_mode);
 }
 
+ErrorOr<void> sleep_ms(u32 milliseconds)
+{
+    if (usleep(1000 * milliseconds) != 0)
+        return Error::from_syscall("usleep"sv, -errno);
+    return {};
+}
+
 }

Libraries/LibCore/System.h

@@ -181,5 +181,6 @@ ErrorOr<void> set_resource_limits(int resource, rlim_t limit);
 
 int getpid();
 bool is_socket(int fd);
+ErrorOr<void> sleep_ms(u32 milliseconds);
 
 }

Libraries/LibCore/SystemWindows.cpp

@@ -225,4 +225,10 @@ bool is_socket(int handle)
     return GetFileType(to_handle(handle)) == FILE_TYPE_PIPE;
 }
 
+ErrorOr<void> sleep_ms(u32 milliseconds)
+{
+    Sleep(milliseconds);
+    return {};
+}
+
 }