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/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <sys/types.h>
#include <signal.h>
#include <hurd.h>
#include <hurd/port.h>
#include <hurd/signal.h>
#include <hurd/msg.h>

/* Send a `sig_post' RPC to process number PID.  If PID is zero,
   send the message to all processes in the current process's process group.
   If PID is < -1, send SIG to all processes in process group - PID.
   SIG and REFPORT are passed along in the request message.  */
_hurd_sig_post (pid_t pid, int sig, mach_port_t arg_refport)
  int delivered = 0;          /* Set when we deliver any signal.  */
  error_t err;
  mach_port_t proc;
  struct hurd_userlink ulink;

  inline void kill_pid (pid_t pid) /* Kill one PID.  */
      err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
                        (refport = arg_refport, 0), 0,
                        /* If no message port we cannot send signals.  */
                        msgport == MACH_PORT_NULL ? EPERM :
                        __msg_sig_post (msgport, sig, 0, refport));
      if (! err)
      delivered = 1;

  proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);

  if (pid <= 0)
      /* Send SIG to each process in pgrp (- PID).  */
      mach_msg_type_number_t npids = 10, i;
      pid_t pidsbuf[10], *pids = pidsbuf;

      err = __proc_getpgrppids (proc, - pid, &pids, &npids);
      if (!err)
        int self = 0;
        for (i = 0; i < npids; ++i)
          if (pids[i] == _hurd_pid)
            /* We must do ourselves last so we are not suspended
             and fail to suspend the other processes in the pgrp.  */
            self = 1;
            kill_pid (pids[i]);
            if (err == ESRCH)
              /* The process died already.  Ignore it.  */
              err = 0;
        if (pids != pidsbuf)
          __vm_deallocate (__mach_task_self (),
                       (vm_address_t) pids, npids * sizeof (pids[0]));

        if (self)
          kill_pid (_hurd_pid);
    kill_pid (pid);

  _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc);

  /* If we delivered no signals, but ERR is clear, this must mean that
     every kill_pid call failed with ESRCH, meaning all the processes in
     the pgrp died between proc_getpgrppids and kill_pid; in that case we
     fail with ESRCH.  */
  return delivered ? 0 : err ?: ESRCH;
weak_alias (_hurd_sig_post, hurd_sig_post)

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