root/sapi/fpm/fpm/fpm_trace_pread.c

DEFINITIONS

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

   1 
   2         /* $Id: fpm_trace_pread.c,v 1.7 2008/08/26 15:09:15 anight Exp $ */
   3         /* (c) 2007,2008 Andrei Nigmatulin */
   4 
   5 #define _GNU_SOURCE
   6 #define _FILE_OFFSET_BITS 64
   7 
   8 #include "fpm_config.h"
   9 
  10 #include <unistd.h>
  11 
  12 #include <fcntl.h>
  13 #include <stdio.h>
  14 #if HAVE_INTTYPES_H
  15 # include <inttypes.h>
  16 #else
  17 # include <stdint.h>
  18 #endif
  19 
  20 #include "fpm_trace.h"
  21 #include "fpm_process_ctl.h"
  22 #include "zlog.h"
  23 
  24 static int mem_file = -1;
  25 
  26 int fpm_trace_signal(pid_t pid) /* {{{ */
  27 {
  28         if (0 > fpm_pctl_kill(pid, FPM_PCTL_STOP)) {
  29                 zlog(ZLOG_SYSERROR, "failed to send SIGSTOP to %d", pid);
  30                 return -1;
  31         }
  32         return 0;
  33 }
  34 /* }}} */
  35 
  36 int fpm_trace_ready(pid_t pid) /* {{{ */
  37 {
  38         char buf[128];
  39 
  40         sprintf(buf, "/proc/%d/" PROC_MEM_FILE, (int) pid);
  41         mem_file = open(buf, O_RDONLY);
  42         if (0 > mem_file) {
  43                 zlog(ZLOG_SYSERROR, "failed to open %s", buf);
  44                 return -1;
  45         }
  46         return 0;
  47 }
  48 /* }}} */
  49 
  50 int fpm_trace_close(pid_t pid) /* {{{ */
  51 {
  52         close(mem_file);
  53         mem_file = -1;
  54         return 0;
  55 }
  56 /* }}} */
  57 
  58 int fpm_trace_get_long(long addr, long *data) /* {{{ */
  59 {
  60         if (sizeof(*data) != pread(mem_file, (void *) data, sizeof(*data), (uintptr_t) addr)) {
  61                 zlog(ZLOG_SYSERROR, "pread() failed");
  62                 return -1;
  63         }
  64         return 0;
  65 }
  66 /* }}} */
  67