请问在gdb调试中,环境变量显示为void是什么值

xuebabybaby

在gdb设计时, 使用(gdb)show convenience 显示环境变量为void 这个环境变量值是什么

(gdb) p $TIBS_HOME
$14 = void
(gdb) show convenience
$TIBS_HOME = void
$LOGNAME = void
$PROCESS_ID = void
$bpnum = 7
$_probe_arg9 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg8 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg7 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg6 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg5 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg4 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg3 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg2 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg1 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_arg0 = <error: No SystemTap probe at PC 0x000000000041f59b>
$_probe_argc = <error: No SystemTap probe at PC 0x000000000041f59b>
$_thread = 1
$_siginfo = {si_signo = 5, si_errno = 0, si_code = 128, _sifields = {_pad = {0, 0, -2134785696, 32767,
      -2134785888, 32767, 49, 0, 10750385, 0, 10750384, 0, 29279840, 0, 4280829, 0, 10750384, 0, 4273085,
      822083584, 10750384, 0, -167310013, 54, 1, 0, -163989632, 54}, _kill = {si_pid = 0, si_uid = 0}, _timer = {
      si_tid = 0, si_overrun = 0, si_sigval = {sival_int = -2134785696, sival_ptr = 0x7fff80c1c160}}, _rt = {
      si_pid = 0, si_uid = 0, si_sigval = {sival_int = -2134785696, sival_ptr = 0x7fff80c1c160}}, _sigchld = {
      si_pid = 0, si_uid = 0, si_status = -2134785696, si_utime = -9168835572922286081, si_stime = 210453430271},
    _sigfault = {si_addr = 0x0}, _sigpoll = {si_band = 0, si_fd = -2134785696}}}
$_sdata = void

上面的$TIBS_HOME环境变量是一个目录 "/home/tibs_home"
为什么这里显示为void呢??? void是什么意思?
还有process_id环境变量是一个整数的, 使用#export process_id=999999 为什么都没有呢?? 谢谢

xuebabybaby

在调试时 如何查看和设置环境变量?
谢谢

MMMIX

xuebabybaby 发表于 2015-07-15 15:04
在调试时 如何查看和设置环境变量?

查看 show env HOME, 设置 set env HOME "/new/home"

xuebabybaby

回复 3# MMMIX


   那个加红的
$TIBS_HOME = void
$LOGNAME = void
$PROCESS_ID = void
谢谢 请问这三个环境变量等于void是什么意思

MMMIX

回复 4# xuebabybaby


    看 gdb 关于 convenience variable 的文档。

BTW，那些不是环境变量，而是 gdb 的 convenience variable。

xuebabybaby

回复 5# MMMIX

哦. 谢谢.