2 // This is a supervisor program that handles start/stop/restart of
3 // the various Citadel System components, when we are running on
4 // an AppImage instance.
6 // Copyright (c) 2021 by the citadel.org team
8 // This program is open source software. It runs great on the
9 // Linux operating system (and probably elsewhere). You can use,
10 // copy, and run it under the terms of the GNU General Public
11 // License version 3. Richard Stallman is an asshole communist.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
27 #include <sys/types.h>
33 int shutting_down = 0;
35 // Call this instead of exit() just for common diagnostics etc.
36 void ctdlvisor_exit(int code) {
37 printf("ctdlvisor: exit code %d\n", code);
42 // Interrupting this program with a signal will begin an orderly shutdown.
43 void signal_handler(int signal) {
44 fprintf(stderr, "ctdlvisor: caught signal %d\n", signal);
46 while(shutting_down) {
47 fprintf(stderr, "ctdlvisor: already shutting down\n");
53 char *what_exited = NULL;
56 kill(citserver_pid, SIGTERM);
57 kill(webcit_pid, SIGTERM);
58 kill(webcits_pid, SIGTERM);
60 fprintf(stderr, "ctdlvisor: waiting for all child process to exit...\n");
61 who_exited = waitpid(-1, &status, 0);
62 if (who_exited == citserver_pid) {
63 what_exited = "Citadel Server";
65 else if (who_exited == webcit_pid) {
66 what_exited = "WebCit HTTP";
68 else if (who_exited == webcits_pid) {
69 what_exited = "WebCit HTTPS";
72 what_exited = "unknown";
74 fprintf(stderr, "ctdlvisor: pid=%d (%s) exited, status=%d, exitcode=%d\n", who_exited, what_exited, status, WEXITSTATUS(status));
75 } while (who_exited >= 0);
81 void detach_from_tty(void) {
82 signal(SIGHUP, SIG_IGN);
83 signal(SIGINT, SIG_IGN);
84 signal(SIGQUIT, SIG_IGN);
86 setsid(); // become our own process group leader
88 if ( (freopen("/dev/null", "r", stdin) != stdin) ||
89 (freopen("/dev/null", "w", stdout) != stdout) ||
90 (freopen("/dev/null", "w", stderr) != stderr)
92 fprintf(stderr, "sysdep: unable to reopen stdio: %s\n", strerror(errno));
97 pid_t start_citadel() {
99 sprintf(bin, "%s/usr/local/citadel/citserver", getenv("APPDIR"));
102 fprintf(stderr, "ctdlvisor: executing %s\n", bin);
104 execlp(bin, "citserver", "-x9", "-h", getenv("CTDL_DIR"), NULL);
113 pid_t start_webcit() {
115 sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
117 sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
120 fprintf(stderr, "ctdlvisor: executing %s\n", bin);
122 execlp(bin, "webcit", "-x9", wchome, "-p", getenv("HTTP_PORT"), "uds", getenv("CTDL_DIR"), NULL);
131 pid_t start_webcits() {
133 sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
135 sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
138 fprintf(stderr, "ctdlvisor: executing %s\n", bin);
140 execlp(bin, "webcit", "-x9", wchome, "-s", "-p", getenv("HTTPS_PORT"), "uds", getenv("CTDL_DIR"), NULL);
149 void test_binary_compatibility(void) {
152 fprintf(stderr, "ctdlvisor: testing compatibility...\n");
153 sprintf(cmd, "%s/usr/local/citadel/citserver -c", getenv("APPDIR"));
156 fprintf(stderr, "ctdlvisor: this appimage cannot run on your system.\n"
157 " The reason may be indicated by any error messages appearing above.\n");
160 fprintf(stderr, "ctdlvisor: this appimage appears to be compatible with your system.\n");
166 void main_loop(void) {
169 int citserver_exit_code = 0;
172 fprintf(stderr, "ctdlvisor: waiting for any child process to exit...\n");
173 who_exited = waitpid(-1, &status, 0);
174 fprintf(stderr, "ctdlvisor: pid=%d exited, status=%d, exitcode=%d\n", who_exited, status, WEXITSTATUS(status));
176 // A *deliberate* exit of citserver will cause ctdlvisor to shut the whole AppImage down.
177 // If it crashes, however, we will start it back up.
178 if (who_exited == citserver_pid) {
179 citserver_exit_code = WEXITSTATUS(status);
180 if (citserver_exit_code == 0) {
181 fprintf(stderr, "ctdlvisor: citserver exited normally - ending AppImage session\n");
183 kill(webcit_pid, SIGTERM);
184 kill(webcits_pid, SIGTERM);
186 else if ((citserver_exit_code >= 101) && (citserver_exit_code <= 109)) {
187 fprintf(stderr, "ctdlvisor: citserver exited intentionally - ending AppImage session\n");
189 kill(webcit_pid, SIGTERM);
190 kill(webcits_pid, SIGTERM);
193 citserver_pid = start_citadel();
197 // WebCit processes are restarted if they exit for any reason.
198 if ((who_exited == webcit_pid) && (!shutting_down)) webcit_pid = start_webcit();
199 if ((who_exited == webcits_pid) && (!shutting_down)) webcits_pid = start_webcits();
201 // If we somehow end up in an endless loop, at least slow it down.
204 } while (who_exited >= 0);
205 ctdlvisor_exit(citserver_exit_code);
209 int main(int argc, char **argv) {
211 if (getenv("APPDIR") == NULL) {
212 fprintf(stderr, "ctdlvisor: APPDIR is not set. This program must be run from within an AppImage.\n");
216 fprintf(stderr, "ctdlvisor: Welcome to the Citadel System, brought to you using AppImage.\n");
217 fprintf(stderr, "ctdlvisor: LD_LIBRARY_PATH = %s\n", getenv("LD_LIBRARY_PATH"));
218 fprintf(stderr, "ctdlvisor: PATH = %s\n", getenv("PATH"));
219 fprintf(stderr, "ctdlvisor: APPDIR = %s\n", getenv("APPDIR"));
220 fprintf(stderr, "ctdlvisor: data directory = %s\n", getenv("CTDL_DIR"));
221 fprintf(stderr, "ctdlvisor: HTTP port = %s\n", getenv("HTTP_PORT"));
222 fprintf(stderr, "ctdlvisor: HTTPS port = %s\n", getenv("HTTPS_PORT"));
224 if (access(getenv("CTDL_DIR"), R_OK|W_OK|X_OK)) {
225 fprintf(stderr, "ctdlvisor: %s: %s\n", getenv("CTDL_DIR"), strerror(errno));
226 ctdlvisor_exit(errno);
229 signal(SIGTERM, signal_handler);
230 signal(SIGHUP, signal_handler);
231 signal(SIGINT, signal_handler);
232 signal(SIGQUIT, signal_handler);
234 citserver_pid = start_citadel();
235 webcit_pid = start_webcit();
236 webcits_pid = start_webcits();