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

   1
   2 /*
   3  * context_save.c -- write out the updated context file
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 /*
  11  * This function used to support setuid/setgid programs by writing
  12  * the file as the user.  But that code, m_chkids(), was removed
  13  * because there no longer are setuid/setgid programs in nmh.
  14  */
  15
  16 #include <h/mh.h>
  17 #include <h/signals.h>
  18
  19 void
  20 context_save (void)
  21 {
  22     register struct node *np;
  23     FILE *out;
  24     sigset_t set, oset;
  25     int failed_to_lock = 0;
  26
  27     /* No context in use -- silently ignore any changes! */
  28     if (!ctxpath)
  29        return;
  30
  31     if (!(ctxflags & CTXMOD))
  32         return;
  33     ctxflags &= ~CTXMOD;
  34
  35     /* block a few signals */
  36     sigemptyset (&set);
  37     sigaddset (&set, SIGHUP);
  38     sigaddset (&set, SIGINT);
  39     sigaddset (&set, SIGQUIT);
  40     sigaddset (&set, SIGTERM);
  41     sigprocmask (SIG_BLOCK, &set, &oset);
  42
  43     if (!(out = lkfopendata (ctxpath, "w", &failed_to_lock))) {
  44         if (failed_to_lock) {
  45             adios (ctxpath, "failed to lock");
  46         } else {
  47             adios (ctxpath, "unable to write");
  48         }
  49     }
  50     for (np = m_defs; np; np = np->n_next)
  51         if (np->n_context)
  52             fprintf (out, "%s: %s\n", np->n_name, np->n_field);
  53     lkfclosedata (out, ctxpath);
  54
  55     sigprocmask (SIG_SETMASK, &oset, &set); /* reset the signal mask */
  56 }