1  /* getsid -- Return session ID of a process.  Hurd version.
       2     Copyright (C) 1995-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       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 <sys/types.h>
      20  #include <unistd.h>
      21  #include <errno.h>
      22  #include <hurd.h>
      23  
      24  pid_t
      25  getsid (pid_t pid)
      26  {
      27    error_t err;
      28    pid_t sid;
      29  
      30    if (pid == 0)
      31      pid = _hurd_pid;
      32  
      33    err = __USEPORT (PROC, __proc_getsid (port, pid, &sid));
      34    if (err)
      35      return (pid_t) __hurd_fail (err);
      36    return sid;
      37  }
      38  libc_hidden_def (getsid)