feat: add SIGINT signal handler

Author: iboukhss

.clang-format

@@ -9,7 +9,7 @@ SpaceAfterCStyleCast: true
 IndentAccessModifiers: false
 AccessModifierOffset: -4
 
-AllowShortCaseLabelsOnASingleLine: true
+#AllowShortCaseLabelsOnASingleLine: true
 AllowShortFunctionsOnASingleLine: InlineOnly
 BreakConstructorInitializers: BeforeColon
 PackConstructorInitializers: Never

HttpResponse.cpp

@@ -8,9 +8,15 @@ std::string HttpResponse::to_string() const
     std::string reason;
 
     switch (status) {
-    case 200: reason = "OK"; break;
-    case 404: reason = "Not Found"; break;
-    default: reason = "Unknown"; break;
+    case 200:
+        reason = "OK";
+        break;
+    case 404:
+        reason = "Not Found";
+        break;
+    default:
+        reason = "Unknown";
+        break;
     }
 
     out << "HTTP/1.1 " << status << " " << reason << "\r\n";

Server.cpp

@@ -66,8 +66,19 @@ Server::~Server()
 
 void Server::run()
 {
-    while (true) {
+    while (!g_sigint_received) {
         int n_events = epoll_wait(epoll_fd_, events_, WEBSERV_MAX_EVENTS, -1);
+        if (n_events == -1) {
+            switch (errno) {
+            case EINTR:
+                // epoll_wait was interrupted by a signal, just move on as if
+                // nothing happened.
+                n_events = 0;
+                break;
+            default:
+                throw SyscallError("epoll_wait", errno);
+            }
+        }
 
         for (int i = 0; i < n_events; ++i) {
             Client* conn = (Client*) events_[i].data.ptr;

Server.hpp

@@ -7,8 +7,12 @@
 #include <sys/epoll.h>
 #include <sys/socket.h>
 
+#include <csignal>
+
 #define WEBSERV_MAX_EVENTS 64
 
+extern volatile sig_atomic_t g_sigint_received;
+
 class Server {
 public:
     Server(in_addr_t ip, in_port_t port, int backlog);

main.cpp

@@ -1,15 +1,27 @@
-
-
 #include "Server.hpp"
 #include "SyscallError.hpp"
 
 #include <iostream>
 
+volatile sig_atomic_t g_sigint_received = 0;
+
+extern "C" void handle_sigint(int sig)
+{
+    (void) sig;
+    g_sigint_received = 1;
+}
+
 int main(void)
 {
     // later params retrieved from config file
     Server server(INADDR_ANY, 8080, 1000);
 
+    struct sigaction sa;
+    sa.sa_handler = handle_sigint;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sigaction(SIGINT, &sa, NULL);
+
     try {
         server.run();
     }