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Last change
on this file since 20 was 4, checked in by Mattia Monga, 14 years ago |
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Importazione sorgenti libro
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File size:
1.5 KB
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| [4] | 1 | /* The kernel call that is implemented in this file:
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| 2 | * m_type: SYS_GETKSIG
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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 with pending signals
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| 6 | * m2_l1: SIG_MAP # bit map with pending signals
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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_GETKSIG
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| 14 |
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| 15 | /*===========================================================================*
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| 16 | * do_getksig *
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| 17 | *===========================================================================*/
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| 18 | PUBLIC int do_getksig(m_ptr)
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| 19 | message *m_ptr; /* pointer to request message */
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| 20 | {
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| 21 | /* PM is ready to accept signals and repeatedly does a kernel call to get
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| 22 | * one. Find a process with pending signals. If no signals are available,
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| 23 | * return NONE in the process number field.
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| 24 | * It is not sufficient to ready the process when PM is informed, because
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| 25 | * PM can block waiting for FS to do a core dump.
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| 26 | */
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| 27 | register struct proc *rp;
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| 28 |
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| 29 | /* Find the next process with pending signals. */
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| 30 | for (rp = BEG_USER_ADDR; rp < END_PROC_ADDR; rp++) {
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| 31 | if (rp->p_rts_flags & SIGNALED) {
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| 32 | m_ptr->SIG_PROC = rp->p_nr; /* store signaled process */
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| 33 | m_ptr->SIG_MAP = rp->p_pending; /* pending signals map */
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| 34 | sigemptyset(&rp->p_pending); /* ball is in PM's court */
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| 35 | rp->p_rts_flags &= ~SIGNALED; /* blocked by SIG_PENDING */
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| 36 | return(OK);
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| 37 | }
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| 38 | }
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| 39 |
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| 40 | /* No process with pending signals was found. */
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| 41 | m_ptr->SIG_PROC = NONE;
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| 42 | return(OK);
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| 43 | }
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| 44 | #endif /* USE_GETKSIG */
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| 45 |
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