sleep: On SIGINT, call default SIGINT handler after printing remainin…

…g time

With this, hitting ctrl-c twice in `for i in $(seq 10) { sleep 1 }`
terminates the loop as expected (...well, I'd expect it to quit after
just one ctrl-c, but serenity's shell makes a single ctrl-c only
quit the current loop iteration).

Part of SerenityOS#3419.

Userland/sleep.cpp

@@ -30,8 +30,10 @@
 #include <string.h>
 #include <unistd.h>
 
+static bool g_interrupted;
 static void handle_sigint(int)
 {
+ g_interrupted = true;
 }
 
 int main(int argc, char** argv)
@@ -47,7 +49,7 @@ int main(int argc, char** argv)
  sa.sa_handler = handle_sigint;
  sigaction(SIGINT, &sa, nullptr);
 
- if (pledge("stdio", nullptr) < 0) {
+ if (pledge("stdio sigaction", nullptr) < 0) {
  perror("pledge");
  return 1;
  }
@@ -56,5 +58,11 @@ int main(int argc, char** argv)
  if (remaining) {
  printf("Sleep interrupted with %u seconds remaining.\n", remaining);
  }
+
+ if (g_interrupted) {
+ signal(SIGINT, SIG_DFL);
+ raise(SIGINT);
+ }
+
  return 0;
 }