external/ibm-public/postfix/dist/src/util/username.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      username 3
   6 /* SUMMARY
   7 /*      lookup name of real user
   8 /* SYNOPSIS
   9 /*      #include <username.h>
  10 /*
  11 /*      const char *username()
  12 /* DESCRIPTION
  13 /*      username() jumps whatever system-specific hoops it takes to
  14 /*      get the name of the user who started the process. The result
  15 /*      is volatile. Make a copy if it is to be used for an appreciable
  16 /*      amount of time.
  17 /* LICENSE
  18 /* .ad
  19 /* .fi
  20 /*      The Secure Mailer license must be distributed with this software.
  21 /* AUTHOR(S)
  22 /*      Wietse Venema
  23 /*      IBM T.J. Watson Research
  24 /*      P.O. Box 704
  25 /*      Yorktown Heights, NY 10598, USA
  26 /*--*/
  27
  28 /* System library. */
  29
  30 #include <sys_defs.h>
  31 #include <unistd.h>
  32 #include <pwd.h>
  33
  34 /* Utility library. */
  35
  36 #include "username.h"
  37
  38 /* username - get name of user */
  39
  40 const char *username(void)
  41 {
  42     uid_t   uid;
  43     struct passwd *pwd;
  44
  45     uid = getuid();
  46     if ((pwd = getpwuid(uid)) == 0)
  47         return (0);
  48     return (pwd->pw_name);
  49 }