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 "context_save.h"
  16 #include "error.h"
  17 #include "h/signals.h"
  18 #include "lock_file.h"
  19
  20 void
  21 context_save (void)
  22 {
  23     struct node *np;
  24     FILE *out;
  25     sigset_t set, oset;
  26     int failed_to_lock = 0;
  27
  28     /* No context in use -- silently ignore any changes! */
  29     if (!ctxpath)
  30        return;
  31
  32     if (!(ctxflags & CTXMOD))
  33         return;
  34     ctxflags &= ~CTXMOD;
  35
  36     /* block a few signals */
  37     sigemptyset (&set);
  38     sigaddset (&set, SIGHUP);
  39     sigaddset (&set, SIGINT);
  40     sigaddset (&set, SIGQUIT);
  41     sigaddset (&set, SIGTERM);
  42     sigprocmask (SIG_BLOCK, &set, &oset);
  43
  44     if (!(out = lkfopendata (ctxpath, "w", &failed_to_lock))) {
  45         if (failed_to_lock)
  46             adios (ctxpath, "failed to lock");
  47         adios (ctxpath, "unable to write");
  48     }
  49     for (np = m_defs; np; np = np->n_next)
  50         if (np->n_context)
  51             fprintf (out, "%s: %s\n", np->n_name, np->n_field);
  52     lkfclosedata (out, ctxpath);
  53
  54     sigprocmask (SIG_SETMASK, &oset, &set); /* reset the signal mask */
  55 }