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

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