external/ibm-public/postfix/dist/src/util/set_eugid.h

   1 /*      $NetBSD$        */
   2
   3 #ifndef _SET_EUGID_H_INCLUDED_
   4 #define _SET_EUGID_H_INCLUDED_
   5
   6 /*++
   7 /* NAME
   8 /*      set_eugid 3h
   9 /* SUMMARY
  10 /*      set effective user and group attributes
  11 /* SYNOPSIS
  12 /*      #include <set_eugid.h>
  13 /* DESCRIPTION
  14 /* .nf
  15
  16  /* External interface. */
  17
  18 extern void set_eugid(uid_t, gid_t);
  19
  20  /*
  21   * The following macros open and close a block that runs at a different
  22   * privilege level. To make mistakes with stray curly braces less likely, we
  23   * shape the macros below as the head and tail of a do-while loop.
  24   */
  25 #define SAVE_AND_SET_EUGID(uid, gid) do { \
  26         uid_t __set_eugid_uid = geteuid(); \
  27         gid_t __set_eugid_gid = getegid(); \
  28         set_eugid((uid), (gid));
  29
  30 #define RESTORE_SAVED_EUGID() \
  31         set_eugid(__set_eugid_uid, __set_eugid_gid); \
  32     } while (0)
  33
  34 /* LICENSE
  35 /* .ad
  36 /* .fi
  37 /*      The Secure Mailer license must be distributed with this software.
  38 /* AUTHOR(S)
  39 /*      Wietse Venema
  40 /*      IBM T.J. Watson Research
  41 /*      P.O. Box 704
  42 /*      Yorktown Heights, NY 10598, USA
  43 /*--*/
  44
  45 #endif