fix non-signal-safe exit, and refactor signal handlers

1 files changed, 37 insertions, 0 deletions

diff --git a/src/signal/sigint_handler.cc b/src/signal/sigint_handler.cc
new file mode 100644
index 0000000..706c041
--- /dev/null
+++ b/src/signal/sigint_handler.cc
@@ -0,0 +1,37 @@
+#include "signal_handler.h"
+
+#include <errno.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+namespace ov4
+{
+
+/* 
+ * sigint_handler - The kernel sends a SIGINT to the shell whenver the
+ *    user types ctrl-c at the keyboard.  Catch it and send it along
+ *    to the foreground job.  
+ */
+void sigint_handler([[maybe_unused]] int sig) 
+{
+    int errno_backup = errno;
+
+    sigset_t prev;
+    block_handler(&prev);
+
+    int pid = fgpid();
+    if (pid != 0)
+    {
+        kill(-pid, SIGINT);
+    } else {
+        tcflush(STDIN_FILENO, TCIFLUSH);
+        ioctl(STDIN_FILENO, TIOCSTI, "\n");
+    }
+
+    sigprocmask(SIG_SETMASK, &prev, nullptr);
+
+    errno = errno_backup;
+    return;
+}
+
+}
\ No newline at end of file