/* 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;
}
void
_hurd_raise_signal (struct hurd_sigstate *ss,
int signo, const struct hurd_signal_detail *detail)
{
if (ss == NULL)
{
ss = _hurd_self_sigstate ();
__spin_lock (&ss->lock);
}
/* Mark SIGNO as pending to be delivered. */
__sigaddset (&ss->pending, signo);
ss->pending_data[signo] = *detail;
__spin_unlock (&ss->lock);
/* Send a message to the signal thread so it will wake up and check for
pending signals. This is a generic "poll request" message (SIGNO==0)
rather than delivering this signal and its detail, because we have
already marked the signal as pending for the particular thread we
want. Generating the signal with an RPC might deliver it to some
other thread. */
__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
}
/* 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;
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);
/* Ignore zombies. */
if (!err && refport != MACH_PORT_NULL)
{
err = __task_terminate (refport);
__mach_port_deallocate (__mach_task_self (), refport);
}
} while (err == MACH_SEND_INVALID_DEST ||
err == MIG_SERVER_DIED);
else
{
error_t taskerr;
error_t kill_port (mach_port_t msgport, mach_port_t refport)
{
if (msgport != MACH_PORT_NULL)
/* Send a signal message to his message port. */
return __msg_sig_post (msgport, sig, 0, refport);
/* The process has no message port. Perhaps try direct
frobnication of the task. */
if (taskerr)
/* If we could not get the task port, we can do nothing. */
return taskerr;
if (refport == MACH_PORT_NULL)
/* proc_pid2task returned success with a null task port.
That means the process is a zombie. Signals
to zombies should return success and do nothing. */
return 0;
/* For user convenience in the case of a task that has
not registered any message port with the proc server,
translate a few signals to direct task operations. */
switch (sig)
{
/* The only signals that really make sense for an
unregistered task are kill, suspend, and continue. */
case SIGSTOP:
case SIGTSTP:
return __task_suspend (refport);
case SIGCONT:
return __task_resume (refport);
case SIGTERM:
case SIGQUIT:
case SIGINT:
return __task_terminate (refport);
default:
/* We have full permission to send signals, but there is
no meaningful way to express this signal. */
return EPERM;
}
}
err = HURD_MSGPORT_RPC (__proc_getmsgport (proc, pid, &msgport),
(taskerr = __proc_pid2task (proc, pid,
&refport)) ?
__proc_getsidport (proc, &refport) : 0, 1,
kill_port (msgport, 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);
}
