From 3b00c7be0e8834402ed93eb42b3a93302076c5ff Mon Sep 17 00:00:00 2001
From: Mikhail Osipov <mike.osipov@gmail.com>
Date: Fri, 18 Oct 2019 17:43:38 +0300
Subject: skel

---
 daemon.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 daemon.c

(limited to 'daemon.c')

diff --git a/daemon.c b/daemon.c
new file mode 100644
index 0000000..305755d
--- /dev/null
+++ b/daemon.c
@@ -0,0 +1,74 @@
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <err.h>
+
+#include "tunnel.h"
+#include "macro.h"
+
+static void sighandler(int signo __unused)
+{
+	unlink(TUNNEL_SOCK_PATH);
+	exit(EXIT_FAILURE);
+}
+
+static void tunnel_daemon_loop(int sock)
+{
+	for (;;) {
+		int fd = accept(sock, NULL, NULL);
+		if (fd < 0) {
+			warn("accept");
+			continue;
+		}
+
+		FILE *fp = fdopen(fd, "w");
+		if (fp) {
+			fprintf(fp, "hello from %d", getpid());
+			fclose(fp);
+		}
+	}
+}
+
+int tunnel_daemon(int sock)
+{
+	switch (fork()) {
+	case -1:
+		warn("fork");
+		return -1;
+	case 0:
+		break;
+	default:
+		return 0;
+	}
+
+	if (setsid() < 0)
+		err(EXIT_FAILURE, "setsid");
+
+	chdir("/");
+
+	struct sigaction sa = {
+		.sa_handler = sighandler
+	};
+
+	sigaction(SIGTERM, &sa, NULL);
+	sigaction(SIGINT, &sa, NULL);
+
+#if 0
+	int fd = open("/dev/null", O_RDWR);
+	if (fd < 0)
+		err(EXIT_FAILURE, "open /dev/null");
+
+	dup2(fd, STDIN_FILENO);
+	dup2(fd, STDOUT_FILENO);
+	dup2(fd, STDERR_FILENO);
+
+	if (fd > 2)
+		close(fd);
+#endif
+
+	tunnel_daemon_loop(sock);
+
+	return 0;
+}
-- 
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