1: /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <errno.h>
   20: #include <sys/types.h>
   21: #include <signal.h>
   22: #include <hurd.h>
   23: #include <hurd/port.h>
   24: #include <hurd/signal.h>
   25: #include <hurd/msg.h>
   26: 
   27: /* Send a `sig_post' RPC to process number PID.  If PID is zero,
   28:    send the message to all processes in the current process's process group.
   29:    If PID is < -1, send SIG to all processes in process group - PID.
   30:    SIG and REFPORT are passed along in the request message.  */
   31: error_t
   32: _hurd_sig_post (pid_t pid, int sig, mach_port_t arg_refport)
   33: {
   34:   int delivered = 0;            /* Set when we deliver any signal.  */
   35:   error_t err;
   36:   mach_port_t proc;
   37:   struct hurd_userlink ulink;
   38: 
   39:   inline void kill_pid (pid_t pid) /* Kill one PID.  */
   40:     {
   41:       err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
   42:                               (refport = arg_refport, 0), 0,
   43:                               /* If no message port we cannot send signals.  */
   44:                               msgport == MACH_PORT_NULL ? EPERM :
   45:                               __msg_sig_post (msgport, sig, 0, refport));
   46:       if (! err)
   47:         delivered = 1;
   48:     }
   49: 
   50:   proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);
   51: 
   52:   if (pid <= 0)
   53:     {
   54:       /* Send SIG to each process in pgrp (- PID).  */
   55:       mach_msg_type_number_t npids = 10, i;
   56:       pid_t pidsbuf[10], *pids = pidsbuf;
   57: 
   58:       err = __proc_getpgrppids (proc, - pid, &pids, &npids);
   59:       if (!err)
   60:         {
   61:           int self = 0;
   62:           for (i = 0; i < npids; ++i)
   63:             if (pids[i] == _hurd_pid)
   64:               /* We must do ourselves last so we are not suspended
   65:                  and fail to suspend the other processes in the pgrp.  */
   66:               self = 1;
   67:             else
   68:               {
   69:                 kill_pid (pids[i]);
   70:                 if (err == ESRCH)
   71:                   /* The process died already.  Ignore it.  */
   72:                   err = 0;
   73:               }
   74:           if (pids != pidsbuf)
   75:             __vm_deallocate (__mach_task_self (),
   76:                              (vm_address_t) pids, npids * sizeof (pids[0]));
   77: 
   78:           if (self)
   79:             kill_pid (_hurd_pid);
   80:         }
   81:     }
   82:   else
   83:     kill_pid (pid);
   84: 
   85:   _hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc);
   86: 
   87:   /* If we delivered no signals, but ERR is clear, this must mean that
   88:      every kill_pid call failed with ESRCH, meaning all the processes in
   89:      the pgrp died between proc_getpgrppids and kill_pid; in that case we
   90:      fail with ESRCH.  */
   91:   return delivered ? 0 : err ?: ESRCH;
   92: }
   93: weak_alias (_hurd_sig_post, hurd_sig_post)