login/logout.c

   1 /* Copyright (C) 1996-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <utmp.h>
  22 #include <time.h>
  23 #include <sys/time.h>
  24 #include <shlib-compat.h>
  25
  26 int
  27 __logout (const char *line)
  28 {
  29   struct utmp tmp, utbuf;
  30   struct utmp *ut;
  31   int result = 0;
  32
  33   /* Tell that we want to use the UTMP file.  */
  34   if (__utmpname (_PATH_UTMP) == -1)
  35     return 0;
  36
  37   /* Open UTMP file.  */
  38   __setutent ();
  39
  40   /* Fill in search information.  */
  41   tmp.ut_type = USER_PROCESS;
  42   strncpy (tmp.ut_line, line, sizeof tmp.ut_line);
  43
  44   /* Read the record.  */
  45   if (__getutline_r (&tmp, &utbuf, &ut) >= 0)
  46     {
  47       /* Clear information about who & from where.  */
  48       memset (ut->ut_name, '\0', sizeof ut->ut_name);
  49       memset (ut->ut_host, '\0', sizeof ut->ut_host);
  50
  51       struct __timespec64 ts;
  52       __clock_gettime64 (CLOCK_REALTIME, &ts);
  53       TIMESPEC_TO_TIMEVAL (&ut->ut_tv, &ts);
  54       ut->ut_type = DEAD_PROCESS;
  55
  56       if (__pututline (ut) != NULL)
  57         result = 1;
  58     }
  59
  60   /* Close UTMP file.  */
  61   __endutent ();
  62
  63   return result;
  64 }
  65 versioned_symbol (libc, __logout, logout, GLIBC_2_34);
  66 libc_hidden_ver (__logout, logout)
  67
  68 #if OTHER_SHLIB_COMPAT (libutil, GLIBC_2_0, GLIBC_2_34)
  69 compat_symbol (libutil, __logout, logout, GLIBC_2_0);
  70 #endif