【gdb】为fork调用设置catchpoint-526互联

为fork调用设置catchpoint

1.例子：

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(void)
{
  pid_t pid;

  pid = fork();
  if (pid < 0)
  {
    exit(1);
  }
  else if (pid > 0)
  {
    exit(0);
  }
  printf("hello world\n");
  return 0;
}

使用gdb调试程序时，可以用“catch fork”命令为fork调用设置catchpoint，以上面程序为例：

[root@node01 demo]# gcc demo.c -g
[root@node01 demo]# gdb a.out -q
Reading symbols from /root/demo/a.out...done.
(gdb) catch fork
Catchpoint 1 (fork)
(gdb) r
Starting program: /root/demo/a.out 

Catchpoint 1 (forked process 3242844), 0x00007ffff7ad2b12 in __libc_fork ()
    at ../nptl/sysdeps/unix/sysv/linux/fork.c:136
136	  pid = ARCH_FORK ();
(gdb) bt
#0  0x00007ffff7ad2b12 in __libc_fork () at ../nptl/sysdeps/unix/sysv/linux/fork.c:136
#1  0x00000000004005ca in main () at demo.c:10
(gdb)

参考资料

1. gdb手册

2. 为fork调用设置catchpoint