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/* Copyright (C) 1991-2021 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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, see
<https://www.gnu.org/licenses/>. */
#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. */
error_t
_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;
else
{
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);
}
}
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 : err ?: ESRCH;
}
weak_alias (_hurd_sig_post, hurd_sig_post)
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