More work on the appimage
authorArt Cancro <ajc@citadel.org>
Sat, 23 Jan 2021 23:50:10 +0000 (23:50 +0000)
committerArt Cancro <ajc@citadel.org>
Sat, 23 Jan 2021 23:50:10 +0000 (23:50 +0000)
appimage/ctdlvisor.c

index a3f52f5..a7ae776 100644 (file)
 #include <string.h>
 #include <limits.h>
 
+void main_loop(void);
+
 char *data_directory = "/usr/local/citadel";
 char *http_port = "80";
 char *https_port = "443";
+pid_t citserver_pid;
+pid_t webcit_pid;
+pid_t webcits_pid;
+
+
+void signal_handler(int signal) {
+       fprintf(stderr, "ctdlvisor: caught signal %d", signal);
+
+       int status;
+       pid_t who_exited;
+       char *what_exited = NULL;
+
+       do {
+               fprintf(stderr, "ctdlvisor: waiting for any child process to exit...\n");
+               who_exited = waitpid(-1, &status, 0);
+               if (who_exited == citserver_pid) {
+                       what_exited = "Citadel Server";
+               }
+               else if (who_exited == webcit_pid) {
+                       what_exited = "WebCit HTTP";
+               }
+               else if (who_exited == webcits_pid) {
+                       what_exited = "WebCit HTTPS";
+               }
+               else {
+                       what_exited = "unknown";
+               }
+               fprintf(stderr, "ctdlvisor: pid=%d (%s) exited, status=%d, exitcode=%d\n", who_exited, what_exited, status, WEXITSTATUS(status));
+       } while (who_exited >= 0);
+
+       printf("ctdlvisor: exiting from signal catcher.\n");
+       exit(0);
+}
+
+
 
 pid_t start_citadel() {
        char bin[1024];
@@ -35,8 +72,8 @@ pid_t start_citadel() {
        pid_t pid = fork();
        if (pid == 0) {
                fprintf(stderr, "ctdlvisor: executing %s\n", bin);
+               close(0); close(1); close(2);
                execlp(bin, "citserver", "-x9", "-h", data_directory, NULL);
-               perror("execlp");
                exit(errno);
        }
        else {
@@ -53,8 +90,8 @@ pid_t start_webcit() {
        pid_t pid = fork();
        if (pid == 0) {
                fprintf(stderr, "ctdlvisor: executing %s\n", bin);
+               close(0); close(1); close(2);
                execlp(bin, "webcit", "-x9", wchome, "-p", http_port, "uds", data_directory, NULL);
-               perror("execlp");
                exit(errno);
        }
        else {
@@ -71,8 +108,8 @@ pid_t start_webcits() {
        pid_t pid = fork();
        if (pid == 0) {
                fprintf(stderr, "ctdlvisor: executing %s\n", bin);
+               close(0); close(1); close(2);
                execlp(bin, "webcit", "-x9", wchome, "-s", "-p", https_port, "uds", data_directory, NULL);
-               perror("execlp");
                exit(errno);
        }
        else {
@@ -82,12 +119,6 @@ pid_t start_webcits() {
 
 
 int main(int argc, char **argv) {
-       pid_t citserver_pid;
-       pid_t webcit_pid;
-       pid_t webcits_pid;
-       int shutting_down = 0;
-       int status;
-       pid_t who_exited;
        int c;
 
        while ((c = getopt (argc, argv, "h:p:s:")) != -1)  switch(c) {
@@ -118,10 +149,25 @@ int main(int argc, char **argv) {
                exit(errno);
        }
 
+       signal(SIGTERM, signal_handler);
+       signal(SIGHUP, signal_handler);
+       signal(SIGINT, signal_handler);
+       signal(SIGQUIT, signal_handler);
+
        citserver_pid = start_citadel();
        webcit_pid = start_webcit();
        webcits_pid = start_webcits();
 
+       main_loop();
+}
+
+
+void main_loop(void) {
+       int status;
+       pid_t who_exited;
+       int shutting_down = 0;
+       int citserver_exit_code = 0;
+
        do {
                fprintf(stderr, "ctdlvisor: waiting for any child process to exit...\n");
                who_exited = waitpid(-1, &status, 0);
@@ -130,26 +176,33 @@ int main(int argc, char **argv) {
                // A *deliberate* exit of citserver will cause ctdlvisor to shut the whole AppImage down.
                // If it crashes, however, we will start it back up.
                if (who_exited == citserver_pid) {
-                       if (WEXITSTATUS(status) == 0) {
+                       citserver_exit_code = WEXITSTATUS(status);
+                       if (citserver_exit_code == 0) {
                                fprintf(stderr, "ctdlvisor: citserver exited normally - ending AppImage session\n");
                                shutting_down = 1;
                                kill(webcit_pid, SIGTERM);
                                kill(webcits_pid, SIGTERM);
                        }
+                       else if ((citserver_exit_code >= 101) && (citserver_exit_code <= 109)) {
+                               fprintf(stderr, "ctdlvisor: citserver exited intentionally - ending AppImage session\n");
+                               shutting_down = 1;
+                               kill(webcit_pid, SIGTERM);
+                               kill(webcits_pid, SIGTERM);
+                       }
                        else {
                                citserver_pid = start_citadel();
                        }
                }
 
                // WebCit processes are restarted if they exit for any reason.
-               if ((who_exited == webcit_pid) && (!shutting_down))             webcit_pid = start_webcit();
-               if ((who_exited == webcits_pid) && (!shutting_down))            webcits_pid = start_webcits();
+               if ((who_exited == webcit_pid) && (!shutting_down))     webcit_pid = start_webcit();
+               if ((who_exited == webcits_pid) && (!shutting_down))    webcits_pid = start_webcits();
 
                // If we somehow end up in an endless loop, at least slow it down.
                sleep(1);
 
-       } while ((who_exited >= 0) && (shutting_down == 0));
+       } while (who_exited >= 0);
 
-       printf("ctdlvisor: exiting.\n");
-       exit(0);
+       printf("ctdlvisor: exit code %d\n", citserver_exit_code);
+       exit(citserver_exit_code);
 }