root/sapi/fpm/fpm/fpm_trace_ptrace.c

DEFINITIONS

1. fpm_trace_signal
2. fpm_trace_ready
3. fpm_trace_close
4. fpm_trace_get_long

   1 
   2         /* $Id: fpm_trace_ptrace.c,v 1.7 2008/09/18 23:34:11 anight Exp $ */
   3         /* (c) 2007,2008 Andrei Nigmatulin */
   4 
   5 #include "fpm_config.h"
   6 
   7 #include <sys/wait.h>
   8 #include <sys/ptrace.h>
   9 #include <unistd.h>
  10 #include <errno.h>
  11 
  12 #if defined(PT_ATTACH) && !defined(PTRACE_ATTACH)
  13 #define PTRACE_ATTACH PT_ATTACH
  14 #endif
  15 
  16 #if defined(PT_DETACH) && !defined(PTRACE_DETACH)
  17 #define PTRACE_DETACH PT_DETACH
  18 #endif
  19 
  20 #if defined(PT_READ_D) && !defined(PTRACE_PEEKDATA)
  21 #define PTRACE_PEEKDATA PT_READ_D
  22 #endif
  23 
  24 #include "fpm_trace.h"
  25 #include "zlog.h"
  26 
  27 static pid_t traced_pid;
  28 
  29 int fpm_trace_signal(pid_t pid) /* {{{ */
  30 {
  31         if (0 > ptrace(PTRACE_ATTACH, pid, 0, 0)) {
  32                 zlog(ZLOG_SYSERROR, "failed to ptrace(ATTACH) child %d", pid);
  33                 return -1;
  34         }
  35         return 0;
  36 }
  37 /* }}} */
  38 
  39 int fpm_trace_ready(pid_t pid) /* {{{ */
  40 {
  41         traced_pid = pid;
  42         return 0;
  43 }
  44 /* }}} */
  45 
  46 int fpm_trace_close(pid_t pid) /* {{{ */
  47 {
  48         if (0 > ptrace(PTRACE_DETACH, pid, (void *) 1, 0)) {
  49                 zlog(ZLOG_SYSERROR, "failed to ptrace(DETACH) child %d", pid);
  50                 return -1;
  51         }
  52         traced_pid = 0;
  53         return 0;
  54 }
  55 /* }}} */
  56 
  57 int fpm_trace_get_long(long addr, long *data) /* {{{ */
  58 {
  59 #ifdef PT_IO
  60         struct ptrace_io_desc ptio = {
  61                 .piod_op = PIOD_READ_D,
  62                 .piod_offs = (void *) addr,
  63                 .piod_addr = (void *) data,
  64                 .piod_len = sizeof(long)
  65         };
  66 
  67         if (0 > ptrace(PT_IO, traced_pid, (void *) &ptio, 0)) {
  68                 zlog(ZLOG_SYSERROR, "failed to ptrace(PT_IO) pid %d", traced_pid);
  69                 return -1;
  70         }
  71 #else
  72         errno = 0;
  73         *data = ptrace(PTRACE_PEEKDATA, traced_pid, (void *) addr, 0);
  74         if (errno) {
  75                 zlog(ZLOG_SYSERROR, "failed to ptrace(PEEKDATA) pid %d", traced_pid);
  76                 return -1;
  77         }
  78 #endif
  79         return 0;
  80 }
  81 /* }}} */
  82