usr/src/cmd/mail/cksaved.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25 #pragma ident   "%Z%%M% %I%     %E% SMI"
  26
  27 /*
  28  *  NAME
  29  *      cksaved - check for an orphaned save file
  30  *
  31  *  SYNOPSIS
  32  *      void cksaved(char *user)
  33  *
  34  *  DESCRIPTION
  35  *      cksaved() looks to see if there is a saved-mail file sitting
  36  *      around which should be reinstated. These files should be sitting
  37  *      around only in the case of a crash during rewriting a mail message.
  38  *
  39  *      The strategy is simple: if the file exists it is appended to
  40  *      the end of $MAIL.  It is better that a user potentially sees the
  41  *      mail twice than to lose it.
  42  *
  43  *      If $MAIL doesn't exist, then a simple rename() will suffice.
  44  */
  45
  46 #include "mail.h"
  47 void
  48 cksaved(user)
  49 char    *user;
  50 {
  51         struct stat stbuf;
  52         char command[512];
  53         char save[MAXFILENAME], mail[MAXFILENAME];
  54
  55         cat(mail, maildir, user);
  56         cat(save, mailsave, user);
  57
  58         /*
  59          *      If no save file, or size is 0, return.
  60          */
  61         if ((stat(save, &stbuf) != 0) || (stbuf.st_size == 0))
  62                 return;
  63
  64         /*
  65          *      Ok, we have a savefile. If no mailfile exists,
  66          *      then we want to restore to the mailfile,
  67          *      else we append to the mailfile.
  68          */
  69         lock(user);
  70         if (stat(mail, &stbuf) != 0) {
  71                 /*
  72                  *      Restore from the save file by linking
  73                  *      it to $MAIL then unlinking save file
  74                  */
  75                 chmod(save, MFMODE);
  76 #ifdef SVR3
  77                 if (link(save, mail) != 0) {
  78                         unlock();
  79                         perror("Restore failed to link to mailfile");
  80                         return;
  81                 }
  82
  83                 if (unlink(save) != 0) {
  84                         unlock();
  85                         perror("Cannot unlink saved file");
  86                         return;
  87                 }
  88 #else
  89                 if (rename(save, mail) != 0) {
  90                         unlock();
  91                         perror("Cannot rename saved file");
  92                         return;
  93                 }
  94 #endif
  95
  96                 (void) snprintf(command, sizeof (command),
  97                     "echo \"Your mailfile was just restored by the mail "
  98                     "program.\nPermissions of your mailfile are set "
  99                     "to 0660.\"| mail %s", user);
 100         }
 101
 102         else {
 103                 FILE *Istream, *Ostream;
 104                 if ((Ostream = fopen(mail, "a")) == NULL) {
 105                         (void) fprintf(stderr,
 106                             "%s: Cannot open file '%s' for output\n",
 107                         program, mail);
 108                         unlock();
 109                         return;
 110                 }
 111                 if ((Istream = fopen(save, "r")) == NULL) {
 112                         (void) fprintf(stderr, "%s: Cannot open saved "
 113                             "file '%s' for reading\n", program, save);
 114                         fclose(Ostream);
 115                         unlock();
 116                         return;
 117                 }
 118                 copystream(Istream, Ostream);
 119                 fclose(Istream);
 120                 fclose(Ostream);
 121
 122                 if (unlink(save) != 0) {
 123                         perror("Unlink of save file failed");
 124                         return;
 125                 }
 126
 127                 (void) snprintf(command, sizeof (command),
 128                     "echo \"Your mail save file has just been appended "
 129                     "to your mail box by the mail program.\" | mail %s", user);
 130         }
 131
 132         /*
 133          *      Try to send mail to the user whose file
 134          *      is being restored.
 135          */
 136         unlock();
 137         systm(command);
 138 }