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

1 files changed, 32 insertions, 0 deletions

diff --git a/src/signal/sigtstp_handler.cc b/src/signal/sigtstp_handler.cc
new file mode 100644
index 0000000..7b32d31
--- /dev/null
+++ b/src/signal/sigtstp_handler.cc
@@ -0,0 +1,32 @@
+#include "signal_handler.h"
+
+#include <errno.h>
+
+namespace ov4
+{
+
+/*
+ * sigtstp_handler - The kernel sends a SIGTSTP to the shell whenever
+ *     the user types ctrl-z at the keyboard. Catch it and suspend the
+ *     foreground job by sending it a SIGTSTP.  
+ */
+void sigtstp_handler([[maybe_unused]] int sig) 
+{
+    int errno_backup = errno;
+
+    sigset_t prev;
+    block_handler(&prev);
+
+    int pid = fgpid();
+    if (pid != 0)
+    {
+        kill(-pid, SIGTSTP);
+    }
+
+    sigprocmask(SIG_SETMASK, &prev, nullptr);
+
+    errno = errno_backup;
+    return;
+}
+
+}
\ No newline at end of file