From 5521d6b6233978f742452758d28031a53e43f97f Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 18 Jul 2019 09:26:31 +0530
Subject: [PATCH] Reset the sigprocmask and signal handlers when launching
 child processes. Fixes #1806

---
 kitty/child.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kitty/child.c b/kitty/child.c
index b4d494921..c0bede074 100644
--- a/kitty/child.c
+++ b/kitty/child.c
@@ -78,8 +78,14 @@ spawn(PyObject *self UNUSED, PyObject *args) {
 
     pid_t pid = fork();
     switch(pid) {
-        case 0:
+        case 0: {
             // child
+            sigset_t signals = {0};
+            struct sigaction act = {.sa_handler=SIG_DFL};
+#define SA(which) { if (sigaction(which, &act, NULL) != 0) exit_on_err("sigaction() in child process failed"); }
+            SA(SIGINT); SA(SIGTERM); SA(SIGCHLD);
+#undef SA
+            if (sigprocmask(SIG_SETMASK, &signals, NULL) != 0) exit_on_err("sigprocmask() in child process failed");
             // Use only signal-safe functions (man 7 signal-safety)
             if (chdir(cwd) != 0) { if (chdir("/") != 0) {} };  // ignore failure to chdir to /
             if (setsid() == -1) exit_on_err("setsid() in child process failed");
@@ -129,6 +135,7 @@ spawn(PyObject *self UNUSED, PyObject *args) {
             execlp("sh", "sh", "-c", "read w", NULL);
             exit(EXIT_FAILURE);
             break;
+        }
         case -1:
             PyErr_SetFromErrno(PyExc_OSError);
             break;