输入C程序test. c

#include <stdio.h>

int main(void)
{
    while(1)
    {
        printf("Hello World!\n");
        sleep(1);
    }
    return 0;
}

使用gcc gcc -g -o test test.c编译
运行程序，看看它给出的输出

./test 
Hello World!
Hello World!
Hello World!
^C

使用子进程运行程序以捕获输出

import subprocess
import shlex

cmd = "./test"
def run_command(command):
    cmds = shlex.split(cmd)
    print(cmds)
    proc = subprocess.Popen(cmds, stdout=subprocess.PIPE)
    try:
        outs, errs = proc.communicate(timeout=15)
    except subprocess.TimeoutExpired:
        proc.kill()
        outs, errs = proc.communicate()
    print(outs)
    
run_command(cmd)

输出为空

python3 test.py 
['./test']
b''

将cmd = "./test"替换为cmd = "gdb -x load ./test"，其中load是带有run命令的文件
输出只是gdb信息，而不是应用程序输出

python3 test.py 
['gdb', '-x', 'load', './test']
b'GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1\nCopyright (C) 2022 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\nType "show copying" and "show warranty" for details.\nThis GDB was configured as "x86_64-linux-gnu".\nType "show configuration" for configuration details.\nFor bug reporting instructions, please see:\n<https://www.gnu.org/software/gdb/bugs/>.\nFind the GDB manual and other documentation resources online at:\n    <http://www.gnu.org/software/gdb/documentation/>.\n\nFor help, type "help".\nType "apropos word" to search for commands related to "word"...\nReading symbols from ./test...\n[Thread debugging using libthread_db enabled]\nUsing host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".\n'