76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_RUNCTL
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m1_i1: RC_ENDPT process number to control
|
|
* m1_i2: RC_ACTION stop or resume the process
|
|
* m1_i3: RC_FLAGS request flags
|
|
*/
|
|
|
|
#include "kernel/system.h"
|
|
#include <assert.h>
|
|
|
|
#if USE_RUNCTL
|
|
|
|
/*===========================================================================*
|
|
* do_runctl *
|
|
*===========================================================================*/
|
|
int do_runctl(struct proc * caller, message * m_ptr)
|
|
{
|
|
/* Control a process's RTS_PROC_STOP flag. Used for process management.
|
|
* If the process is queued sending a message or stopped for system call
|
|
* tracing, and the RC_DELAY request flag is given, set MF_SIG_DELAY instead
|
|
* of RTS_PROC_STOP, and send a SIGSNDELAY signal later when the process is done
|
|
* sending (ending the delay). Used by PM for safe signal delivery.
|
|
*/
|
|
int proc_nr, action, flags;
|
|
register struct proc *rp;
|
|
|
|
/* Extract the message parameters and do sanity checking. */
|
|
if (!isokendpt(m_ptr->RC_ENDPT, &proc_nr)) return(EINVAL);
|
|
if (iskerneln(proc_nr)) return(EPERM);
|
|
rp = proc_addr(proc_nr);
|
|
|
|
action = m_ptr->RC_ACTION;
|
|
flags = m_ptr->RC_FLAGS;
|
|
|
|
/* Is the target sending or syscall-traced? Then set MF_SIG_DELAY instead.
|
|
* Do this only when the RC_DELAY flag is set in the request flags field.
|
|
* The process will not become runnable before PM has called SYS_ENDKSIG.
|
|
* Note that asynchronous messages are not covered: a process using SENDA
|
|
* should not also install signal handlers *and* expect POSIX compliance.
|
|
*/
|
|
|
|
if (action == RC_STOP && (flags & RC_DELAY)) {
|
|
if (RTS_ISSET(rp, RTS_SENDING) || (rp->p_misc_flags & MF_SC_DEFER))
|
|
rp->p_misc_flags |= MF_SIG_DELAY;
|
|
|
|
if (rp->p_misc_flags & MF_SIG_DELAY)
|
|
return (EBUSY);
|
|
}
|
|
|
|
/* Either set or clear the stop flag. */
|
|
switch (action) {
|
|
case RC_STOP:
|
|
#if CONFIG_SMP
|
|
/* check if we must stop a process on a different CPU */
|
|
if (rp->p_cpu != cpuid) {
|
|
smp_schedule_stop_proc(rp);
|
|
break;
|
|
}
|
|
#endif
|
|
RTS_SET(rp, RTS_PROC_STOP);
|
|
break;
|
|
case RC_RESUME:
|
|
assert(RTS_ISSET(rp, RTS_PROC_STOP));
|
|
RTS_UNSET(rp, RTS_PROC_STOP);
|
|
break;
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
|
|
return(OK);
|
|
}
|
|
|
|
#endif /* USE_RUNCTL */
|
|
|