do_getksig.c

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    1 /* The kernel call that is implemented in this file:
    2  *   m_type:    SYS_GETKSIG
    3  *
    4  * The parameters for this kernel call are:
    5  *     m2_i1:   SIG_PROC        # process with pending signals
    6  *     m2_l1:   SIG_MAP         # bit map with pending signals
    7  */
    8 
    9 #include "../system.h"
   10 #include <signal.h>
   11 #include <sys/sigcontext.h>
   12 
   13 #if USE_GETKSIG
   14 
   15 /*===========================================================================*
   16  *                            do_getksig                                     *
   17  *===========================================================================*/
   18 PUBLIC int do_getksig(m_ptr)
   19 message *m_ptr;                 /* pointer to request message */
   20 {
   21 /* PM is ready to accept signals and repeatedly does a kernel call to get 
   22  * one. Find a process with pending signals. If no signals are available, 
   23  * return NONE in the process number field.
   24  * It is not sufficient to ready the process when PM is informed, because 
   25  * PM can block waiting for FS to do a core dump.
   26  */
   27   register struct proc *rp;
   28 
   29   /* Find the next process with pending signals. */
   30   for (rp = BEG_USER_ADDR; rp < END_PROC_ADDR; rp++) {
   31       if (rp->p_rts_flags & SIGNALED) {
   32           m_ptr->SIG_PROC = rp->p_nr;           /* store signaled process */
   33           m_ptr->SIG_MAP = rp->p_pending;       /* pending signals map */
   34           sigemptyset(&rp->p_pending);          /* ball is in PM's court */
   35           rp->p_rts_flags &= ~SIGNALED;         /* blocked by SIG_PENDING */
   36           return(OK);
   37       }
   38   }
   39 
   40   /* No process with pending signals was found. */
   41   m_ptr->SIG_PROC = NONE; 
   42   return(OK);
   43 }
   44 #endif /* USE_GETKSIG */
   45

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FreeBSD/Linux Kernel Cross Reference sys/kernel/system/do_getksig.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/system/do_getksig.c