GDB Debug Fork Child

GDB Debug Fork Child

reference : https://sourceware.org/gdb/onlinedocs/gdb/Forks.html

使用方式

最近剛好遇到要如何下Breakpoint在Fork產生的child的程式裡，我也找到GDB所提供的參數
只要特定好以下的參數，在下Breakpoint

(gdb) set follow-fork-mode child
(gdb) b main.c:40  # 這個只是例子，請將breakpoint下在child會跑的地方
(gdb) c

參數說明

set follow-fork-mode mode

Set the debugger response to a program call of fork or vfork.
A call to fork or vfork creates a new process. The mode argument can be:
parent
The original process is debugged after a fork. The child process runs unimpeded. This is the default.
child
The new process is debugged after a fork. The parent process runs unimpeded.