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107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <errno.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <hurd.h>
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#include <hurd/port.h>
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#include <hurd/signal.h>
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#include <hurd/msg.h>
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/* Send signal SIG to process number PID. If PID is zero,
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send SIG to all processes in the current process's process group.
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If PID is < -1, send SIG to all processes in process group - PID. */
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int
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__kill (pid_t pid, int sig)
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{
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int delivered = 0; /* Set when we deliver any signal. */
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error_t err;
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mach_port_t proc;
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struct hurd_userlink ulink;
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inline void kill_pid (pid_t pid) /* Kill one PID. */
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{
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/* SIGKILL is not delivered as a normal signal.
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Sending SIGKILL to a process means to terminate its task. */
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if (sig == SIGKILL)
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/* Fetch the process's task port and terminate the task. We
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loop in case the process execs and changes its task port.
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If the old task port dies after we fetch it but before we
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send the RPC, we get MACH_SEND_INVALID_DEST; if it dies
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after we send the RPC request but before it is serviced, we
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get MIG_SERVER_DIED. */
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do
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{
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task_t refport;
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err = __proc_pid2task (proc, pid, &refport);
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if (!err)
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{
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err = __task_terminate (refport);
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__mach_port_deallocate (__mach_task_self (), refport);
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}
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} while (err == MACH_SEND_INVALID_DEST ||
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err == MIG_SERVER_DIED);
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else
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err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
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__proc_pid2task (proc, pid, &refport) ?
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__proc_getsidport (proc, &refport) : 0, 1,
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/* If no msgport, we cannot send a signal. */
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msgport == MACH_PORT_NULL ? EPERM :
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__msg_sig_post (msgport, sig, refport));
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if (! err)
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delivered = 1;
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}
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proc = _hurd_port_get (&_hurd_ports[INIT_PORT_PROC], &ulink);
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if (pid <= 0)
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{
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/* Send SIG to each process in pgrp (- PID). */
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pid_t pidbuf[10], *pids = pidbuf;
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mach_msg_type_number_t i, npids = sizeof (pidbuf) / sizeof (pidbuf[0]);
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err = __proc_getpgrppids (proc, - pid, &pids, &npids);
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if (!err)
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{
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for (i = 0; i < npids; ++i)
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{
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kill_pid (pids[i]);
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if (err == ESRCH)
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/* The process died already. Ignore it. */
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err = 0;
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}
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if (pids != pidbuf)
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__vm_deallocate (__mach_task_self (),
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(vm_address_t) pids, npids * sizeof (pids[0]));
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}
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}
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else
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kill_pid (pid);
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_hurd_port_free (&_hurd_ports[INIT_PORT_PROC], &ulink, proc);
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/* If we delivered no signals, but ERR is clear, this must mean that
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every kill_pid call failed with ESRCH, meaning all the processes in
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the pgrp died between proc_getpgrppids and kill_pid; in that case we
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fail with ESRCH. */
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return delivered ? 0 : __hurd_fail (err ?: ESRCH);
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}
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weak_alias (__kill, kill)
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