appimage/ctdlvisor.c

   1 //
   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.
   5 //
   6 // Copyright (c) 2021 by the citadel.org team
   7 //
   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.
  12 //
  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.
  17
  18
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <sys/wait.h>
  23 #include <errno.h>
  24
  25
  26 pid_t start_citadel() {
  27         char bin[1024];
  28         sprintf(bin, "%s/usr/local/citadel/citserver", getenv("APPDIR"));
  29         pid_t pid = fork();
  30         if (pid == 0) {
  31                 printf("Executing %s\n", bin);
  32                 execlp(bin, "citserver", "-x9", "-h/usr/local/citadel", NULL);
  33                 perror("execlp");
  34                 exit(errno);
  35         }
  36         else {
  37                 return(pid);
  38         }
  39 }
  40
  41
  42 pid_t start_webcit() {
  43         char bin[1024];
  44         sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
  45         char wchome[1024];
  46         sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
  47         pid_t pid = fork();
  48         if (pid == 0) {
  49                 printf("Executing %s\n", bin);
  50                 execlp(bin, "webcit", "-x9", wchome, "-p80", "uds", "/usr/local/citadel", NULL);
  51                 perror("execlp");
  52                 exit(errno);
  53         }
  54         else {
  55                 return(pid);
  56         }
  57 }
  58
  59
  60 pid_t start_webcits() {
  61         char bin[1024];
  62         sprintf(bin, "%s/usr/local/webcit/webcit", getenv("APPDIR"));
  63         char wchome[1024];
  64         sprintf(wchome, "-h%s/usr/local/webcit", getenv("APPDIR"));
  65         pid_t pid = fork();
  66         if (pid == 0) {
  67                 printf("Executing %s\n", bin);
  68                 execlp(bin, "webcit", "-x9", wchome, "-s", "-p443", "uds", "/usr/local/citadel", NULL);
  69                 perror("execlp");
  70                 exit(errno);
  71         }
  72         else {
  73                 return(pid);
  74         }
  75 }
  76
  77
  78 main() {
  79         int status;
  80         pid_t who_exited;
  81
  82         pid_t citserver_pid = start_citadel();
  83         pid_t webcit_pid = start_webcit();
  84         pid_t webcits_pid = start_webcits();
  85
  86         do {
  87                 printf("LD_LIBRARY_PATH = %s\n", getenv("LD_LIBRARY_PATH"));
  88                 printf("PATH = %s\n", getenv("PATH"));
  89                 printf("APPDIR = %s\n", getenv("APPDIR"));
  90
  91                 printf("waiting...\n");
  92                 who_exited = waitpid(-1, &status, 0);
  93                 printf("pid=%d exited, status=%d\n", who_exited, status);
  94
  95                 if (who_exited == citserver_pid) {
  96                         if (WEXITSTATUS(status) == 0) {
  97                                 printf("ctdlvisor: citserver exited normally - ending AppImage session\n");
  98                                 exit(0);
  99                         }
 100                         citserver_pid = start_citadel();
 101                 }
 102
 103                 if (who_exited == webcit_pid)           webcit_pid = start_webcit();
 104                 if (who_exited == webcits_pid)          webcits_pid = start_webcits();
 105
 106                 sleep(1);                               // slow down any accidental loops
 107
 108         } while (who_exited >= 0);
 109
 110         printf("ctdlvisor: exiting.\n");
 111         exit(0);
 112 }