The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* The kernel call that is implemented in this file:
    2  *   m_type:    SYS_SIGSEND
    3  *
    4  * The parameters for this kernel call are:
    5  *     m2_i1:   SIG_PROC        # process to call signal handler
    6  *     m2_p1:   SIG_CTXT_PTR    # pointer to sigcontext structure
    7  *     m2_i3:   SIG_FLAGS       # flags for S_SIGRETURN call    
    8  *
    9  */
   10 
   11 #include "../system.h"
   12 #include <signal.h>
   13 #include <string.h>
   14 #include <sys/sigcontext.h>
   15 
   16 #if USE_SIGSEND
   17 
   18 /*===========================================================================*
   19  *                            do_sigsend                                     *
   20  *===========================================================================*/
   21 PUBLIC int do_sigsend(m_ptr)
   22 message *m_ptr;                 /* pointer to request message */
   23 {
   24 /* Handle sys_sigsend, POSIX-style signal handling. */
   25 
   26   struct sigmsg smsg;
   27   register struct proc *rp;
   28   phys_bytes src_phys, dst_phys;
   29   struct sigcontext sc, *scp;
   30   struct sigframe fr, *frp;
   31 
   32   if (! isokprocn(m_ptr->SIG_PROC)) return(EINVAL);
   33   if (iskerneln(m_ptr->SIG_PROC)) return(EPERM);
   34   rp = proc_addr(m_ptr->SIG_PROC);
   35 
   36   /* Get the sigmsg structure into our address space.  */
   37   src_phys = umap_local(proc_addr(PM_PROC_NR), D, (vir_bytes) 
   38       m_ptr->SIG_CTXT_PTR, (vir_bytes) sizeof(struct sigmsg));
   39   if (src_phys == 0) return(EFAULT);
   40   phys_copy(src_phys,vir2phys(&smsg),(phys_bytes) sizeof(struct sigmsg));
   41 
   42   /* Compute the user stack pointer where sigcontext will be stored. */
   43   scp = (struct sigcontext *) smsg.sm_stkptr - 1;
   44 
   45   /* Copy the registers to the sigcontext structure. */
   46   memcpy(&sc.sc_regs, (char *) &rp->p_reg, sizeof(struct sigregs));
   47 
   48   /* Finish the sigcontext initialization. */
   49   sc.sc_flags = SC_SIGCONTEXT;
   50   sc.sc_mask = smsg.sm_mask;
   51 
   52   /* Copy the sigcontext structure to the user's stack. */
   53   dst_phys = umap_local(rp, D, (vir_bytes) scp,
   54       (vir_bytes) sizeof(struct sigcontext));
   55   if (dst_phys == 0) return(EFAULT);
   56   phys_copy(vir2phys(&sc), dst_phys, (phys_bytes) sizeof(struct sigcontext));
   57 
   58   /* Initialize the sigframe structure. */
   59   frp = (struct sigframe *) scp - 1;
   60   fr.sf_scpcopy = scp;
   61   fr.sf_retadr2= (void (*)()) rp->p_reg.pc;
   62   fr.sf_fp = rp->p_reg.fp;
   63   rp->p_reg.fp = (reg_t) &frp->sf_fp;
   64   fr.sf_scp = scp;
   65   fr.sf_code = 0;       /* XXX - should be used for type of FP exception */
   66   fr.sf_signo = smsg.sm_signo;
   67   fr.sf_retadr = (void (*)()) smsg.sm_sigreturn;
   68 
   69   /* Copy the sigframe structure to the user's stack. */
   70   dst_phys = umap_local(rp, D, (vir_bytes) frp, 
   71       (vir_bytes) sizeof(struct sigframe));
   72   if (dst_phys == 0) return(EFAULT);
   73   phys_copy(vir2phys(&fr), dst_phys, (phys_bytes) sizeof(struct sigframe));
   74 
   75   /* Reset user registers to execute the signal handler. */
   76   rp->p_reg.sp = (reg_t) frp;
   77   rp->p_reg.pc = (reg_t) smsg.sm_sighandler;
   78 
   79   return(OK);
   80 }
   81 
   82 #endif /* USE_SIGSEND */
   83 

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