Write more tests and improve kill() on Windows

examples/pause.c

@@ -0,0 +1,36 @@
+#if 0
+/*─────────────────────────────────────────────────────────────────╗
+│ To the extent possible under law, Justine Tunney has waived      │
+│ all copyright and related or neighboring rights to this file,    │
+│ as it is written in the following disclaimers:                   │
+│   • http://unlicense.org/                                        │
+│   • http://creativecommons.org/publicdomain/zero/1.0/            │
+╚─────────────────────────────────────────────────────────────────*/
+#endif
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/sigaction.h"
+#include "libc/fmt/itoa.h"
+#include "libc/str/str.h"
+
+volatile int g_sig;
+
+void OnSig(int sig) {
+  g_sig = sig;
+}
+
+int main(int argc, char *argv[]) {
+
+  // listen for all signals
+  for (int sig = 1; sig <= NSIG; ++sig) {
+    signal(sig, OnSig);
+  }
+
+  // wait for a signal
+  char ibuf[12];
+  FormatInt32(ibuf, getpid());
+  tinyprint(2, "waiting for signal to be sent to ", ibuf, "\n", NULL);
+  pause();
+
+  // report the signal
+  tinyprint(1, "got ", strsignal(g_sig), "\n", NULL);
+}