dcm/startdcm.c

   1 /*
   2  *      $Source$
   3  *      $Author$
   4  *      $Header$
   5  *
   6  *      Copyright (C) 1987, 1988 by the Massachusetts Institute of Technology
   7  *      For copying and distribution information, please see the file
   8  *      <mit-copyright.h>.
   9  *
  10  *      This program starts the DCM in a "clean" environment.
  11  *      and then waits for it to exit.
  12  */
  13
  14 #ifndef lint
  15 static char *rcsid_mr_starter_c = "$Header$";
  16 #endif lint
  17
  18 #include <mit-copyright.h>
  19 #include <stdio.h>
  20 #include <strings.h>
  21 #include <sys/types.h>
  22 #include <sys/file.h>
  23 #include <sys/wait.h>
  24 #include <sys/signal.h>
  25 #include <sys/ioctl.h>
  26 #include <fcntl.h>
  27 #include <sys/resource.h>
  28 #include <moira_site.h>
  29
  30 #define PROG    "dcm"
  31
  32 int rdpipe[2];
  33 extern int errno;
  34
  35 void cleanup()
  36 {
  37         int stat, serrno = errno;
  38         char buf[BUFSIZ];
  39
  40         buf[0]='\0';
  41
  42         while (waitpid(-1, &stat, WNOHANG) > 0) {
  43                 if (WIFEXITED(stat)) {
  44                         if (WEXITSTATUS(stat))
  45                                 sprintf(buf,
  46                                         "exited with code %d\n",
  47                                         WEXITSTATUS(stat));
  48                 }
  49                 if (WIFSIGNALED(stat)) {
  50                         sprintf(buf, "exited with signal %d%s\n",
  51                                 WTERMSIG(stat),
  52                                 (WCOREDUMP(stat)?"; Core dumped":0));
  53                 }
  54                 write(rdpipe[1], buf, strlen(buf));
  55                 close(rdpipe[1]);
  56         }
  57         errno = serrno;
  58 }
  59
  60 main(argc, argv)
  61 {
  62         char buf[BUFSIZ];
  63         FILE *log, *prog;
  64         int logf, inf, i, done, pid, tty;
  65         struct rlimit rl;
  66
  67         extern int errno;
  68         extern char *sys_errlist[];
  69
  70         struct sigaction action;
  71         int nfds;
  72
  73         getrlimit(RLIMIT_NOFILE, &rl);
  74         nfds = rl.rlim_cur;
  75
  76         action.sa_handler = cleanup;
  77         action.sa_flags = 0;
  78         sigemptyset(&action.sa_mask);
  79         sigaction(SIGCHLD, &action, NULL);
  80
  81         sprintf(buf, "%s/%s.log", SMS_DIR, PROG);
  82         logf = open(buf, O_CREAT|O_WRONLY|O_APPEND, 0640);
  83         if (logf<0) {
  84                 perror(buf);
  85                 exit(1);
  86         }
  87         inf = open("/dev/null", O_RDONLY , 0);
  88         if (inf < 0) {
  89                 perror("/dev/null");
  90                 exit(1);
  91         }
  92         pipe(rdpipe);
  93         if (fork()) {
  94                 exit(0);
  95         }
  96         chdir("/");
  97         close(0);
  98         close(1);
  99         close(2);
 100         dup2(inf, 0);
 101         dup2(inf, 1);
 102         dup2(inf, 2);
 103
 104         setpgrp();
 105         sprintf(buf, "%s/%s", BIN_DIR, PROG);
 106
 107         if ((pid = fork()) == 0) {
 108
 109                 dup2(inf, 0);
 110                 dup2(rdpipe[1], 1);
 111                 dup2(1,2);
 112                 for (i = 3; i <nfds; i++) close(i);
 113                 execl(buf, PROG, 0);
 114                 perror("cannot run dcm");
 115                 exit(1);
 116         }
 117         if (pid<0) {
 118                 perror("startdcm");
 119                 exit(1);
 120         }
 121
 122         log = fdopen(logf, "w");
 123         prog = fdopen(rdpipe[0], "r");
 124
 125
 126         do {
 127                 char *time_s;
 128                 extern char *ctime();
 129                 long foo;
 130
 131                 done = 0;
 132                 errno = 0;
 133                 if (fgets(buf, BUFSIZ, prog) == NULL) {
 134                         if (errno) {
 135                                 strcpy(buf, "Unable to read from program: ");
 136                                 strcat(buf, sys_errlist[errno]);
 137                                 strcat(buf, "\n");
 138                         } else break;
 139                 }
 140                 time(&foo);
 141                 time_s = ctime(&foo)+4;
 142                 time_s[strlen(time_s)-6]='\0';
 143                 fprintf(log, "%s <%d> %s", time_s, pid, buf);
 144                 fflush(log);
 145         } while (!done);
 146         exit(0);
 147 }
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