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