OrionLibC

diff --git a/signal/tgkill.c b/signal/tgkill.c
new file mode 100644
index 0000000..760795b
--- /dev/null
+++ b/signal/tgkill.c
@@ -0,0 +1,16 @@
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <errno.h>
+
+/* Send a signal to a thread */
+int
+tgkill(pid_t tgid, pid_t tid, int sig)
+{
+	int ret;
+	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_TGKILL),
+	             "c" (3), "S" (&tgid));
+	if (ret >= 0)
+		return ret;
+	errno = -ret;
+	return -1;
+}