如何检查或确保设置后叉模式子项是否受支持？

问题描述

我是RaspBerry Pi上的远程调试代码，正在尝试做

set follow-fork-mode child

它报告与之合作

show follow-fork-mode

但实际上不起作用：观察到的fork的返回值为正PID。

如何知道是我的配置错误还是完全不支持child模式？

---

gdb会话记录

(gdb) file a.out
Reading symbols from a.out...done.
(gdb) b 159
Breakpoint 1 at 0x11384: file myfile.c,line 159.
(gdb) show follow-fork-mode
Debugger response to a program call of fork or vfork is "child".
(gdb) r
Starting program: MYPATH/a.out
Reading /lib/ld-linux-armhf.so.3 from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
Reading /lib/ld-linux-armhf.so.3 from remote target...
Reading /lib/ld-2.19.so from remote target...
Reading /lib/.debug/ld-2.19.so from remote target...
Reading /usr/lib/arm-linux-gnueabihf/libarmmem.so from remote target...
Reading /lib/arm-linux-gnueabihf/libc.so.6 from remote target...
Reading /lib/arm-linux-gnueabihf/libc-2.19.so from remote target...
Reading /lib/arm-linux-gnueabihf/.debug/libc-2.19.so from remote target...

Breakpoint 1,main (argc=1,argv=0x7efff7c4) at myfile.c:159
159         mppts_number = index;
(gdb) n
163         pid = fork();
(gdb) n
164         if (pid == -1)
(gdb) p pid
$1 = 10459
(gdb) disconnect
Ending remote debugging.

由于pid变量包含某些内容，这意味着我们仍在父级中。

解决方法

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