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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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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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/* Ignore zombies. */
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if (!err && refport != MACH_PORT_NULL)
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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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{
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error_t taskerr;
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error_t kill_port (mach_port_t msgport, mach_port_t refport)
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{
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if (msgport != MACH_PORT_NULL)
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/* Send a signal message to his message port. */
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return __msg_sig_post (msgport, sig, 0, refport);
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/* The process has no message port. Perhaps try direct
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frobnication of the task. */
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if (taskerr)
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/* If we could not get the task port, we can do nothing. */
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return taskerr;
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if (refport == MACH_PORT_NULL)
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/* proc_pid2task returned success with a null task port.
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That means the process is a zombie. Signals
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to zombies should return success and do nothing. */
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return 0;
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/* For user convenience in the case of a task that has
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not registered any message port with the proc server,
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translate a few signals to direct task operations. */
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switch (sig)
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{
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/* The only signals that really make sense for an
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unregistered task are kill, suspend, and continue. */
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case SIGSTOP:
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case SIGTSTP:
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return __task_suspend (refport);
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case SIGCONT:
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return __task_resume (refport);
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case SIGTERM:
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case SIGQUIT:
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case SIGINT:
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return __task_terminate (refport);
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default:
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/* We have full permission to send signals, but there is
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no meaningful way to express this signal. */
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return EPERM;
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}
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}
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err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
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(taskerr = __proc_pid2task (proc, pid,
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&refport)) ?
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__proc_getsidport (proc, &refport) : 0, 1,
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kill_port (msgport, refport));
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}
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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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