diplodocus.org Git - nmh/blob - sbr/ext_hook.c

   1 /*
   2  *
   3  *      Run a program that hooks into some other system.  The first argument is
   4  *      name of the hook to use, the second is the full path name of a mail message.
   5  *      The third argument is also the full path name of a mail message, or a NULL
   6  *      pointer if it isn't needed.  Look in the context for an error message if
   7  *      something goes wrong; there is a built-in message in case one isn't specified.
   8  *      Only produce the error message once.
   9  */
  10
  11 #include <h/mh.h>
  12
  13 int
  14 ext_hook(char *hook_name, char *message_file_name_1, char *message_file_name_2)
  15 {
  16     char        *hook;                  /* hook program from context */
  17     pid_t       pid;                    /* ID of child process */
  18     int         status;                 /* exit or other child process status */
  19     char        *vec[4];                /* argument vector for child process */
  20
  21     static  int did_message = 0;        /* set if we've already output a message */
  22
  23     if ((hook = context_find(hook_name)) == (char *)0)
  24         return (OK);
  25
  26     switch (pid = vfork()) {
  27     case -1:
  28         status = NOTOK;
  29         advise(NULL, "external database may be out-of-date.");
  30         break;
  31
  32     case 0:
  33         vec[0] = r1bindex(hook, '/');
  34         vec[1] = message_file_name_1;
  35         vec[2] = message_file_name_2;
  36         vec[3] = (char *)0;
  37         execvp(hook, vec);
  38         _exit(-1);
  39         /* NOTREACHED */
  40
  41     default:
  42         status = pidwait(pid, -1);
  43         break;
  44     }
  45
  46     if (status != OK) {
  47         if (did_message == 0) {
  48             if ((hook = context_find("msg-hook")) != (char *)0)
  49                 advise(NULL, hook);
  50             else
  51                 advise(NULL, "external hook (%s) did not work properly.", hook);
  52
  53             did_message = 1;
  54         }
  55
  56         return (NOTOK);
  57     }
  58
  59     else
  60         return (OK);
  61 }