commands/mdb/trace.c

   1 /*
   2  * trace.c for mdb
   3  */
   4
   5 #include "mdb.h"
   6 #include <stdio.h>
   7 #include <sys/ptrace.h>
   8 #include "proto.h"
   9
  10 /* mdbtrace()
  11  * Call ptrace and check for error if debugging running process
  12  * Otherwise read 'core' file
  13  */
  14 long mdbtrace(req, pid, addr, data)
  15 int req, pid;
  16 long addr, data;
  17 {
  18   long val;
  19   int i;
  20   int segment;
  21
  22 #ifdef  DEBUG
  23   if (debug) Printf("ptrace: req=%d pid=%d addr=%lx data=%lx\n",
  24                 req, pid, addr, data);
  25 #endif
  26
  27   if (corepid < 0)
  28   {
  29         errno = 0;
  30         /* Call normal ptrace and check for error */
  31         val = ptrace(req, pid, addr, data);
  32         if (errno != 0) {
  33                 do_error("mdb ptrace error ");
  34                 mdb_error("\n");
  35         }
  36 #ifdef  DEBUG
  37         if (debug) Printf("ptrace: val=>%lx\n", val);
  38 #endif
  39         return val;
  40   }
  41   else
  42         return read_core(req, addr, data);
  43 }
  44
  45 /* Used by disassembler */
  46 u32_t peek_dword(addr)
  47 off_t addr;
  48 {
  49     return mdbtrace(T_GETINS, curpid, addr, 0L);
  50 }
  51