讓catchpoint只觸發一次

例子

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

int main(void) {
    pid_t pid;
    int i = 0;

    for (i = 0; i < 2; i++)
    {
	    pid = fork();
	    if (pid < 0)
	    {
	        exit(1);
	    }
	    else if (pid == 0)
	    {
	        exit(0);
	    }
    }
    printf("hello world\n");
    return 0;
}

技巧

使用gdb調試程序時,可以用“tcatch”命令設置catchpoint只觸發一次,以上面程序為例:

(gdb) tcatch fork
Catchpoint 1 (fork)
(gdb) r
Starting program: /home/nan/a

Temporary catchpoint 1 (forked process 27377), 0x00000034e42acdbd in fork () from /lib64/libc.so.6
(gdb) c
Continuing.
hello world
[Inferior 1 (process 27373) exited normally]
(gdb) q

可以看到當程序只在第一次調用fork時暫停。

參見gdb手冊.

貢獻者

nanxiao


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