47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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/* The system call implemented in this file:
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* m_type: SYS_GETSIG
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*
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* The parameters for this system call are:
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* m2_i1: SIG_PROC (return proc nr or NONE here)
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* m2_l1: SIG_MAP (return signal map here)
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*/
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#include "../kernel.h"
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#include "../system.h"
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#include <signal.h>
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/*===========================================================================*
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* do_getsig *
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*===========================================================================*/
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PUBLIC int do_getsig(m_ptr)
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message *m_ptr; /* pointer to the request message */
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{
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/* MM is ready to accept signals and repeatedly does a system call to get one
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* Find a process with pending signals. If no more signals are available,
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* return NONE in the process number field.
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*/
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register struct proc *rp;
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/* Only the MM is allowed to request pending signals. */
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if (m_ptr->m_source != MM_PROC_NR)
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return(EPERM);
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/* Find the next process with pending signals. */
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for (rp = BEG_SERV_ADDR; rp < END_PROC_ADDR; rp++) {
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if (rp->p_flags & PENDING) {
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m_ptr->SIG_PROC = proc_number(rp);
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m_ptr->SIG_MAP = rp->p_pending;
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sigemptyset(&rp->p_pending); /* the ball is now in MM's court */
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rp->p_flags &= ~PENDING; /* remains inhibited 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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