/*===========================================================================*
* process_ksig *
*===========================================================================*/
int process_ksig(endpoint_t proc_nr_e, int signo)
{
register struct mproc *rmp;
int proc_nr;
pid_t proc_id, id;
if(pm_isokendpt(proc_nr_e, &proc_nr) != OK || proc_nr < 0) {
printf("PM: process_ksig: %d?? not ok\n", proc_nr_e);
return EDEADEPT; /* process is gone. */
}
rmp = &mproc[proc_nr];
if ((rmp->mp_flags & (IN_USE | EXITING)) != IN_USE) {
#if 0
printf("PM: process_ksig: %d?? exiting / not in use\n", proc_nr_e);
#endif
return EDEADEPT; /* process is gone. */
}
proc_id = rmp->mp_pid;
mp = &mproc[0]; /* pretend signals are from PM */
mp->mp_procgrp = rmp->mp_procgrp; /* get process group right */
/* For SIGVTALRM and SIGPROF, see if we need to restart a
* virtual timer. For SIGINT, SIGWINCH and SIGQUIT, use proc_id 0
* to indicate a broadcast to the recipient's process group. For
* SIGKILL, use proc_id -1 to indicate a systemwide broadcast.
*/
switch (signo) {
case SIGINT:
case SIGQUIT:
case SIGWINCH:
id = 0; break; /* broadcast to process group */
case SIGVTALRM:
case SIGPROF:
check_vtimer(proc_nr, signo);
/* fall-through */
default:
id = proc_id;
break;
}
check_sig(id, signo, TRUE /* ksig */);
/* If SIGSNDELAY is set, an earlier sys_stop() failed because the process was
* still sending, and the kernel hereby tells us that the process is now done
* with that. We can now try to resume what we planned to do in the first
* place: set up a signal handler. However, the process's message may have
* been a call to PM, in which case the process may have changed any of its
* signal settings. The process may also have forked, exited etcetera.
*/
if (signo == SIGSNDELAY && (rmp->mp_flags & DELAY_CALL)) {
rmp->mp_flags &= ~DELAY_CALL;
/*
* If the VFS_CALL flag is still set we have a process which is stopped
* and we only need to wait for a reply from VFS. We are going to check
* the pending signal then
*/
if (rmp->mp_flags & VFS_CALL)
return OK;
if (rmp->mp_flags & PM_SIG_PENDING)
panic("process_ksig: bad process state");
/* Process as many normal signals as possible. */
check_pending(rmp);
if (rmp->mp_flags & DELAY_CALL)
panic("process_ksig: multiple delay calls?");
}
/* See if the process is still alive */
if ((mproc[proc_nr].mp_flags & (IN_USE | EXITING)) == IN_USE) {
return OK; /* signal has been delivered */
}
else {
return EDEADEPT; /* process is gone */
}
}
/*===========================================================================*
* process_ksig *
*===========================================================================*/
int process_ksig(endpoint_t proc_nr_e, int signo)
{
register struct mproc *rmp;
int proc_nr;
pid_t proc_id, id;
if(pm_isokendpt(proc_nr_e, &proc_nr) != OK) {
printf("PM: process_ksig: %d?? not ok\n", proc_nr_e);
return EDEADEPT; /* process is gone. */
}
rmp = &mproc[proc_nr];
if ((rmp->mp_flags & (IN_USE | EXITING)) != IN_USE) {
#if 0
printf("PM: process_ksig: %d?? exiting / not in use\n", proc_nr_e);
#endif
return EDEADEPT; /* process is gone. */
}
proc_id = rmp->mp_pid;
mp = &mproc[0]; /* pretend signals are from PM */
mp->mp_procgrp = rmp->mp_procgrp; /* get process group right */
/* For SIGVTALRM and SIGPROF, see if we need to restart a
* virtual timer. For SIGINT, SIGINFO, SIGWINCH and SIGQUIT, use proc_id 0
* to indicate a broadcast to the recipient's process group. For
* SIGKILL, use proc_id -1 to indicate a systemwide broadcast.
*/
switch (signo) {
case SIGINT:
case SIGQUIT:
case SIGWINCH:
case SIGINFO:
id = 0; break; /* broadcast to process group */
case SIGVTALRM:
case SIGPROF:
check_vtimer(proc_nr, signo);
/* fall-through */
default:
id = proc_id;
break;
}
check_sig(id, signo, TRUE /* ksig */);
/* If SIGSNDELAY is set, an earlier sys_stop() failed because the process was
* still sending, and the kernel hereby tells us that the process is now done
* with that. We can now try to resume what we planned to do in the first
* place: set up a signal handler. However, the process's message may have
* been a call to PM, in which case the process may have changed any of its
* signal settings. The process may also have forked, exited etcetera.
*/
if (signo == SIGSNDELAY && (rmp->mp_flags & DELAY_CALL)) {
/* When getting SIGSNDELAY, the process is stopped at least until the
* receipt of the SIGSNDELAY signal is acknowledged to the kernel. The
* process is not stopped on PROC_STOP in the kernel. However, now that
* there is no longer a delay call, stop_proc() is guaranteed to
* succeed immediately.
*/
rmp->mp_flags &= ~DELAY_CALL;
assert(!(rmp->mp_flags & PROC_STOPPED));
/* If the delay call was to PM, it may have resulted in a VFS call. In
* that case, we must wait with further signal processing until VFS has
* replied. Stop the process.
*/
if (rmp->mp_flags & VFS_CALL) {
stop_proc(rmp, FALSE /*may_delay*/);
return OK;
}
/* Process as many normal signals as possible. */
check_pending(rmp);
assert(!(rmp->mp_flags & DELAY_CALL));
}
/* See if the process is still alive */
if ((mproc[proc_nr].mp_flags & (IN_USE | EXITING)) == IN_USE) {
return OK; /* signal has been delivered */
}
else {
return EDEADEPT; /* process is gone */
}
}
