usr/src/lib/libmail/common/delempty.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  *  NAME
  34  *      delempty - delete an empty mail box
  35  *
  36  *  SYNOPSIS
  37  *      int delempty(mode_t mode, char *mailname)
  38  *
  39  *  DESCRIPTION
  40  *      Delete an empty mail box if it's allowed. Check
  41  *      the value of xgetenv("DEL_EMPTY_MFILE") for
  42  *      "yes" [always], "no" [never] or the default [based
  43  *      on the mode].
  44  */
  45
  46 #include "libmail.h"
  47 #include <sys/types.h>
  48 #include <unistd.h>
  49
  50 int
  51 delempty(mode_t mode, char *mailname)
  52 {
  53         char *del_empty = Xgetenv("DEL_EMPTY_MFILE");
  54         size_t del_len;
  55         int do_del = 0;
  56
  57         del_len = strlen(del_empty);
  58         /* "yes" means always remove the mailfile */
  59         if (casncmp(del_empty, "yes", (ssize_t)del_len))
  60                 do_del = 1;
  61         /* "no" means never remove the mailfile */
  62         else if (!casncmp(del_empty, "no", (ssize_t)del_len)) {
  63                 /* check for mode 0660 */
  64                 if ((mode & 07777) == MFMODE)
  65                         do_del = 1;
  66         }
  67
  68         if (do_del)
  69                 (void) unlink(mailname);
  70         return (do_del);
  71 }