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-rw-r--r--sysdeps/mach/hurd/kill.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/kill.c b/sysdeps/mach/hurd/kill.c
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+++ b/sysdeps/mach/hurd/kill.c
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+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, 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 signal SIG to process number PID. If PID is zero,
+ send SIG to all processes in the current process's process group.
+ If PID is < -1, send SIG to all processes in process group - PID. */
+int
+__kill (pid_t pid, int sig)
+{
+ 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. */
+ {
+ /* SIGKILL is not delivered as a normal signal.
+ Sending SIGKILL to a process means to terminate its task. */
+ if (sig == SIGKILL)
+ /* Fetch the process's task port and terminate the task. We
+ loop in case the process execs and changes its task port.
+ If the old task port dies after we fetch it but before we
+ send the RPC, we get MACH_SEND_INVALID_DEST; if it dies
+ after we send the RPC request but before it is serviced, we
+ get MIG_SERVER_DIED. */
+ do
+ {
+ task_t refport;
+ err = __proc_pid2task (proc, pid, &refport);
+ if (!err)
+ {
+ err = __task_terminate (refport);
+ __mach_port_deallocate (__mach_task_self (), refport);
+ }
+ } while (err == MACH_SEND_INVALID_DEST ||
+ err == MIG_SERVER_DIED);
+ else
+ err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
+ __proc_pid2task (proc, pid, &refport) ?
+ __proc_getsidport (proc, &refport) : 0, 1,
+ /* If no msgport, we cannot send a signal. */
+ msgport == MACH_PORT_NULL ? EPERM :
+ __msg_sig_post (msgport, sig, 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). */
+ pid_t pidbuf[10], *pids = pidbuf;
+ mach_msg_type_number_t i, npids = sizeof (pidbuf) / sizeof (pidbuf[0]);
+
+ err = __proc_getpgrppids (proc, - pid, &pids, &npids);
+ if (!err)
+ {
+ for (i = 0; i < npids; ++i)
+ {
+ kill_pid (pids[i]);
+ if (err == ESRCH)
+ /* The process died already. Ignore it. */
+ err = 0;
+ }
+ if (pids != pidbuf)
+ __vm_deallocate (__mach_task_self (),
+ (vm_address_t) pids, npids * sizeof (pids[0]));
+ }
+ }
+ else
+ 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 : __hurd_fail (err ?: ESRCH);
+}
+
+weak_alias (__kill, kill)