| 1 | /* The kernel call that is implemented in this file:
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| 2 | * m_type: SYS_KILL
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| 3 | *
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| 4 | * The parameters for this kernel call are:
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| 5 | * m2_i1: SIG_PROC # process to signal/ pending
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| 6 | * m2_i2: SIG_NUMBER # signal number to send to process
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| 7 | */
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| 8 |
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| 9 | #include "../system.h"
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| 10 | #include <signal.h>
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| 11 | #include <sys/sigcontext.h>
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| 12 |
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| 13 | #if USE_KILL
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| 14 |
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| 15 | /*===========================================================================*
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| 16 | * do_kill *
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| 17 | *===========================================================================*/
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| 18 | PUBLIC int do_kill(m_ptr)
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| 19 | message *m_ptr; /* pointer to request message */
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| 20 | {
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| 21 | /* Handle sys_kill(). Cause a signal to be sent to a process. The PM is the
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| 22 | * central server where all signals are processed and handler policies can
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| 23 | * be registered. Any request, except for PM requests, is added to the map
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| 24 | * of pending signals and the PM is informed about the new signal.
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| 25 | * Since system servers cannot use normal POSIX signal handlers (because they
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| 26 | * are usually blocked on a RECEIVE), they can request the PM to transform
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| 27 | * signals into messages. This is done by the PM with a call to sys_kill().
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| 28 | */
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| 29 | proc_nr_t proc_nr = m_ptr->SIG_PROC;
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| 30 | int sig_nr = m_ptr->SIG_NUMBER;
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| 31 |
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| 32 | if (! isokprocn(proc_nr) || sig_nr > _NSIG) return(EINVAL);
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| 33 | if (iskerneln(proc_nr)) return(EPERM);
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| 34 |
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| 35 | if (m_ptr->m_source == PM_PROC_NR) {
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| 36 | /* Directly send signal notification to a system process. */
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| 37 | if (! (priv(proc_addr(proc_nr))->s_flags & SYS_PROC)) return(EPERM);
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| 38 | send_sig(proc_nr, sig_nr);
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| 39 | } else {
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| 40 | /* Set pending signal to be processed by the PM. */
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| 41 | cause_sig(proc_nr, sig_nr);
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| 42 | }
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| 43 | return(OK);
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| 44 | }
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| 45 |
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| 46 | #endif /* USE_KILL */
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| 47 |
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