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Unify the interactive and non-interactive signal handlers

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The signal handlers for interactive and non-interactive SIGINT were distinct
and talked to the reader. This wasn't really justified and will complicate
having multiple threads. Unify these into a single signal handler.
This commit is contained in:
ridiculousfish 2019-05-26 00:32:11 -07:00
parent 5a4df9dd3a
commit d729d57d94
1 changed files with 6 additions and 17 deletions
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23
src/signal.cpp
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@ -251,14 +251,6 @@ static void handle_int(int sig, siginfo_t *info, void *context) {
topic_monitor_t::principal().post(topic_t::sighupint);
}
/// Non-interactive ^C handler.
static void handle_int_notinteractive(int sig, siginfo_t *info, void *context) {
if (reraise_if_forked_child(sig)) return;
parser_t::skip_all_blocks();
default_handler(sig, info, context);
topic_monitor_t::principal().post(topic_t::sighupint);
}
/// sigchld handler. Does notification and calls the handler in proc.c.
static void handle_chld(int sig, siginfo_t *info, void *context) {
if (reraise_if_forked_child(sig)) return;
@ -300,7 +292,6 @@ static void set_interactive_handlers() {
// Interactive mode. Ignore interactive signals. We are a shell, we know what is best for
// the user.
act.sa_handler = SIG_IGN;
sigaction(SIGINT, &act, NULL);
sigaction(SIGQUIT, &act, NULL);
sigaction(SIGTSTP, &act, NULL);
sigaction(SIGTTOU, &act, NULL);
@ -310,10 +301,6 @@ static void set_interactive_handlers() {
act.sa_flags = SA_SIGINFO;
sigaction(SIGTTIN, &act, NULL);
act.sa_sigaction = &handle_int;
act.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &act, NULL);
// SIGTERM restores the terminal controlling process before dying.
act.sa_sigaction = &handle_sigterm;
act.sa_flags = SA_SIGINFO;
@ -345,10 +332,6 @@ static void set_non_interactive_handlers() {
act.sa_handler = SIG_IGN;
sigaction(SIGQUIT, &act, 0);
act.sa_sigaction = &handle_int_notinteractive;
act.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &act, NULL);
}
/// Sets up appropriate signal handlers.
@ -359,9 +342,15 @@ void signal_set_handlers() {
// Ignore SIGPIPE. We'll detect failed writes and deal with them appropriately. We don't want
// this signal interrupting other syscalls or terminating us.
act.sa_sigaction = nullptr;
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, 0);
// Apply our SIGINT handler.
act.sa_sigaction = &handle_int;
act.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &act, NULL);
// Whether or not we're interactive we want SIGCHLD to not interrupt restartable syscalls.
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = &handle_chld;