+//
+// This is a supervisor program that handles start/stop/restart of
+// the various Citadel System components, when we are running on
+// an AppImage instance.
+//
+// Copyright (c) 2021 by the citadel.org team
+//
+// This program is open source software. It runs great on the
+// Linux operating system (and probably elsewhere). You can use,
+// copy, and run it under the terms of the GNU General Public
+// License version 3. Richard Stallman is an asshole communist.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+
+pid_t start_citadel() {
+ char bin[1024];
+ sprintf(bin, "%s/usr/local/citadel/citserver", getenv("APPDIR"));
+ pid_t pid = fork();
+ if (pid == 0) {
+ printf("Executing %s\n", bin);
+ execlp(bin, "citserver", "-x9", "-h/usr/local/citadel", NULL);
+ perror("execlp");
+ exit(errno);
+ }
+ else {
+ return(pid);
+ }
+}
+
+
+pid_t start_webcit() {
+ char bin[1024];
+ sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
+ pid_t pid = fork();
+ if (pid == 0) {
+ printf("Executing %s\n", bin);
+ execlp(bin, "webcit", "-x9", "-p80", "uds", "/usr/local/citadel", NULL);
+ perror("execlp");
+ exit(errno);
+ }
+ else {
+ return(pid);
+ }
+}
+
+
+pid_t start_webcits() {
+ char bin[1024];
+ sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
+ pid_t pid = fork();
+ if (pid == 0) {
+ printf("Executing %s\n", bin);
+ execlp(bin, "webcit", "-x9", "-s", "-p443", "uds", "/usr/local/citadel", NULL);
+ perror("execlp");
+ exit(errno);
+ }
+ else {
+ return(pid);
+ }
+}
+
+
+main() {
+ int status;
+ pid_t who_exited;
+
+ pid_t citserver_pid = start_citadel();
+ pid_t webcit_pid = start_webcit();
+ pid_t webcits_pid = start_webcits();
+
+ do {
+ printf("LD_LIBRARY_PATH = %s\n", getenv("LD_LIBRARY_PATH"));
+ printf("PATH = %s\n", getenv("PATH"));
+ printf("APPDIR = %s\n", getenv("APPDIR"));
+
+ printf("waiting...\n");
+ who_exited = waitpid(-1, &status, 0);
+ printf("pid=%d exited, status=%d\n", who_exited, status);
+
+ if (who_exited == citserver_pid) {
+ if (WEXITSTATUS(status) == 0) {
+ printf("ctdlvisor: citserver exited normally - ending AppImage session\n");
+ exit(0);
+ }
+ citserver_pid = start_citadel();
+ }
+
+ if (who_exited == webcit_pid) webcit_pid = start_webcit();
+ if (who_exited == webcits_pid) webcits_pid = start_webcits();
+
+ sleep(1); // slow down any accidental loops
+
+ } while (who_exited >= 0);
+
+ printf("ctdlvisor: exiting.\n");
+ exit(0);
+}