0946d128cd
- Moved generic_handler() from system.c to system/do_irqctl.c. - Set privileges of system processes somewhat stricter.
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* The system call that is implemented in this file:
|
|
* m_type: SYS_KILL
|
|
*
|
|
* The parameters for this system call are:
|
|
* m2_i1: SIG_PROC # process to signal/ pending
|
|
* m2_i2: SIG_NUMBER # signal number to send to process
|
|
*/
|
|
|
|
#include "../system.h"
|
|
#include <signal.h>
|
|
#include <sys/sigcontext.h>
|
|
|
|
#if USE_KILL
|
|
|
|
/*===========================================================================*
|
|
* do_kill *
|
|
*===========================================================================*/
|
|
PUBLIC int do_kill(m_ptr)
|
|
message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Handle sys_kill(). Cause a signal to be sent to a process. The PM is the
|
|
* central server where all signals are processed and handler policies can
|
|
* be registered. Any request, except for PM requests, is added to the map
|
|
* of pending signals and the PM is informed about the new signal.
|
|
* Since system servers cannot use normal POSIX signal handlers (because they
|
|
* are usually blocked on a RECEIVE), they can request the PM to transform
|
|
* signals into messages. This is done by the PM with a call to sys_kill().
|
|
*/
|
|
proc_nr_t proc_nr = m_ptr->SIG_PROC;
|
|
int sig_nr = m_ptr->SIG_NUMBER;
|
|
|
|
if (! isokprocn(proc_nr) || sig_nr > _NSIG) return(EINVAL);
|
|
if (iskerneln(proc_nr)) return(EPERM);
|
|
|
|
if (m_ptr->m_source == PM_PROC_NR) {
|
|
/* Directly send signal notification to a system process. */
|
|
if (! (priv(proc_addr(proc_nr))->s_flags & SYS_PROC)) return(EPERM);
|
|
send_sig(proc_nr, sig_nr);
|
|
} else {
|
|
/* Set pending signal to be processed by the PM. */
|
|
cause_sig(proc_nr, sig_nr);
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
#endif /* USE_KILL */
|
|
|