45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* The kernel call that is implemented in this file:
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* m_type: SYS_GETKSIG
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*
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* The parameters for this kernel call are:
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* m2_i1: SIG_PROC # process with pending signals
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* m2_l1: SIG_MAP # bit map with pending signals
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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_GETKSIG
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/*===========================================================================*
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* do_getksig *
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*===========================================================================*/
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PUBLIC int do_getksig(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* PM is ready to accept signals and repeatedly does a kernel call to get
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* one. Find a process with pending signals. If no signals are available,
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* return NONE in the process number field.
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* It is not sufficient to ready the process when PM is informed, because
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* PM can block waiting for FS to do a core dump.
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*/
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register struct proc *rp;
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/* Find the next process with pending signals. */
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for (rp = BEG_USER_ADDR; rp < END_PROC_ADDR; rp++) {
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if (rp->p_rts_flags & SIGNALED) {
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m_ptr->SIG_PROC = rp->p_nr; /* store signaled process */
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m_ptr->SIG_MAP = rp->p_pending; /* pending signals map */
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sigemptyset(&rp->p_pending); /* ball is in PM's court */
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rp->p_rts_flags &= ~SIGNALED; /* blocked by SIG_PENDING */
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return(OK);
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}
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}
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/* No process with pending signals was found. */
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m_ptr->SIG_PROC = NONE;
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return(OK);
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}
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#endif /* USE_GETKSIG */
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