minix/kernel/system/do_kill.c

   1 /* The kernel call that is implemented in this file:
   2  *      m_type: SYS_KILL
   3  *
   4  * The parameters for this kernel call are:
   5  *      m_sigcalls.endpt        # process to signal/ pending
   6  *      m_sigcalls.sig          # signal number to send to process
   7  */
   8
   9 #include "kernel/system.h"
  10 #include <signal.h>
  11
  12 #if USE_KILL
  13
  14 /*===========================================================================*
  15  *                                do_kill                                    *
  16  *===========================================================================*/
  17 int do_kill(struct proc * caller, message * m_ptr)
  18 {
  19 /* Handle sys_kill(). Cause a signal to be sent to a process. Any request
  20  * is added to the map of pending signals and the signal manager
  21  * associated to the process is informed about the new signal. The signal
  22  * is then delivered using POSIX signal handlers for user processes, or
  23  * translated into an IPC message for system services.
  24  */
  25   proc_nr_t proc_nr, proc_nr_e;
  26   int sig_nr = m_ptr->m_sigcalls.sig;
  27
  28   proc_nr_e = (proc_nr_t)m_ptr->m_sigcalls.endpt;
  29
  30   if (!isokendpt(proc_nr_e, &proc_nr)) return(EINVAL);
  31   if (sig_nr >= _NSIG) return(EINVAL);
  32   if (iskerneln(proc_nr)) return(EPERM);
  33
  34   /* Set pending signal to be processed by the signal manager. */
  35   cause_sig(proc_nr, sig_nr);
  36
  37   return(OK);
  38 }
  39
  40 #endif /* USE_KILL */
  41