4.3BSD - /usr/src/new/mh/sbr/m_update.c

   1: /* m_update.c - update the profile */
   2: 
   3: #include "../h/mh.h"
   4: #include <stdio.h>
   5: #include <signal.h>
   6: 
   7: 
   8: void m_update () {
   9:     int     action;
  10:     int     (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
  11:     register struct node   *np;
  12:     FILE * out;
  13: 
  14:     if (!(ctxflags & CTXMOD))
  15:     return;
  16:     ctxflags &= ~CTXMOD;
  17: 
  18:     if ((action = m_chkids ()) > OK)
  19:     return;         /* child did it for us */
  20: 
  21:     hstat = signal (SIGHUP, SIG_IGN);
  22:     istat = signal (SIGINT, SIG_IGN);
  23:     qstat = signal (SIGQUIT, SIG_IGN);
  24:     tstat = signal (SIGTERM, SIG_IGN);
  25: 
  26:     if ((out = fopen (ctxpath, "w")) == NULL)
  27:     adios (ctxpath, "unable to write");
  28:     for (np = m_defs; np; np = np -> n_next)
  29:     if (np -> n_context)
  30:         fprintf (out, "%s: %s\n", np -> n_name, np -> n_field);
  31:     (void) fclose (out);
  32: 
  33:     (void) signal (SIGHUP, hstat);
  34:     (void) signal (SIGINT, istat);
  35:     (void) signal (SIGQUIT, qstat);
  36:     (void) signal (SIGTERM, tstat);
  37:     if (action == OK)
  38:     _exit (0);      /* we are child, time to die */
  39: }
  40: 
  41: /*  */
  42: 
  43: /* This hack brought to you so we can handle set[ug]id MH programs.  If we
  44:    return NOTOK, then no fork is made, we update .mh_profile normally, and
  45:    return to the caller normally.  If we return 0, then the child is
  46:    executing, .mh_profile is modified after we set our [ug]ids to the norm.
  47:    If we return > 0, then the parent is executed and .mh_profile has
  48:    already be modified.  We can just return to the caller immediately. */
  49: 
  50: 
  51: static int  m_chkids () {
  52:     int     i,
  53:             child_id;
  54: 
  55:     if (getuid () == geteuid ())
  56:     return (NOTOK);
  57: 
  58:     for (i = 0; (child_id = fork ()) == -1 && i < 5; i++)
  59:     sleep (5);
  60:     switch (child_id) {
  61:     case NOTOK:
  62:         break;
  63: 
  64:     case OK:
  65:         (void) setgid (getgid ());
  66:         (void) setuid (getuid ());
  67:         break;
  68: 
  69:     default:
  70:         (void) pidwait (child_id, NOTOK);
  71:         break;
  72:     }
  73: 
  74:     return child_id;
  75: }

Defined functions