93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/* Copyright (C) 1991-2022 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, see
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<https://www.gnu.org/licenses/>. */
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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 a `sig_post' RPC to process number PID. If PID is zero,
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send the message 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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SIG and REFPORT are passed along in the request message. */
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error_t
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_hurd_sig_post (pid_t pid, int sig, mach_port_t arg_refport)
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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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err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
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(refport = arg_refport, 0), 0,
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/* If no message port we cannot send signals. */
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msgport == MACH_PORT_NULL ? EPERM
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: __msg_sig_post (msgport, sig, 0, 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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mach_msg_type_number_t npids = 10, i;
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pid_t pidsbuf[10], *pids = pidsbuf;
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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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int self = 0;
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for (i = 0; i < npids; ++i)
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if (pids[i] == _hurd_pid)
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/* We must do ourselves last so we are not suspended
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and fail to suspend the other processes in the pgrp. */
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self = 1;
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else
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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 != pidsbuf)
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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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if (self)
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kill_pid (_hurd_pid);
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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 : err ?: ESRCH;
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}
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weak_alias (_hurd_sig_post, hurd_sig_post)
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