42ab148155
New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* The system call that is implemented in this file:
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* SYS_SIGCTL # signal handling functionality
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*
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* The parameters and types for this system call are:
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* SIG_REQUEST # request to perform (long)
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* SIG_PROC # process to signal/ pending (int)
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* SIG_CTXT_PTR # pointer to sigcontext structure (pointer)
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* SIG_FLAGS # flags for S_SIGRETURN call (int)
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* SIG_MAP # bit map with pending signals (long)
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* SIG_NUMBER # signal number to send to process (int)
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*
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* Supported request types are in the parameter SIG_REQUEST:
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* S_GETSIG # get a pending kernel signal
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* S_ENDSIG # signal has been processed
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* S_SENDSIG # deliver a POSIX-style signal
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* S_SIGRETURN # return from a POSIX-style signal
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* S_KILL # send a signal to a 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_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 system 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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*/
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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;
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m_ptr->SIG_MAP = rp->p_pending;
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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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