我无法调试远程调试会话的子进程。我找到了一个类似的问题，如何在GDB中调试fork-exec过程的入口点？
我正在按照相同的步骤进行操作，尽管是针对远程目标。对于远程目标，是否支持follow-fork-mode child？
以下是我的示例代码。
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <sys/types.h>
4 #include <unistd.h>
5
6 int spawn (void)
7 {
8 pid_t child_pid;
9 /* Duplicate this process. */
10 child_pid = fork ();
11 if (child_pid != 0)
12 /* This is the parent process. */
13 return child_pid;
14 else {
15 /* Now execute PROGRAM, searching for it in the path. */
16 while(1)
17 {
18 static int i = 0;
19 if(i==0) /* break here for child */
20 {
21 printf("I am child\n");
22 }
23 else if(i==3)
24 {
25 return 1;
26 }
27 else
28 {
29 i = 0/0;
30 }
31 i++;
32 }
33 }
34 return 0;
35 }
36 int main ()
37 {
38 /* Spawn a child process running the .ls. command. Ignore the
39 returned child process ID. */
40 printf("Hello World..!!\n");
41 spawn ();
42 printf ("Bbye World..!!\n");
43 return 0;
44 }
使用gdb运行它，我可以在子进程中设置断点..一切正常!!
sh-3.2# gdb fork
(gdb) set follow-fork-mode child
(gdb) set detach-on-fork off
(gdb) b 19
Breakpoint 1 at 0x80483d0: file fork-exec.c, line 19.
(gdb) c
The program is not being run.
(gdb) start
Breakpoint 2 at 0x8048437: file fork-exec.c, line 40.
Starting program: fork
main () at fork-exec.c:40
40 printf("Hello World..!!\n");
(gdb) c
Continuing.
Hello World..!!
[Switching to process 10649]
Breakpoint 1, spawn () at fork-exec.c:19
19 if(i==0) /* break here for child */
(gdb)
然而，如果我尝试通过gdbserver捕获子进程，则断点会丢失。
sh-3.2# gdbserver :1234 fork &
[5] 10686
sh-3.2# Process fork created; pid = 10689
Listening on port 1234
以目标远程方式运行
sh-3.2# gdb fork
(gdb) target remote localhost:1234
Remote debugging using localhost:1234
Remote debugging from host 127.0.0.1
[New Thread 10689]
0x00bd2810 in _start () from /lib/ld-linux.so.2
(gdb) break 19
Breakpoint 1 at 0x80483d0: file fork-exec.c, line 19.
(gdb) c
Continuing.
Hello World..!!
Bbye World..!!
Child exited with retcode = 0
Program exited normally.
Child exited with status 0
GDBserver exiting
在嵌入式世界中，调试子进程的步骤是什么？我知道可以进行进程附加，但我想从子进程的一开始就进行调试。