我如何制作一个启动Python脚本的linux后台进程（在c中）

Question

我制作了一个Linux后台进程（在c ++中），该进程监视目录，并在该目录中出现某个文件时尝试启动Python脚本。我的问题是，调用execvp函数后，负责启动Python脚本的子进程立即退出，我不明白为什么。所有必需的文件均由root拥有。这是我的代码，如果有帮助。预先感谢您提供任何指导！我已在发生错误的代码中标记了该错误。我还包含了要调用的Python脚本]

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

using namespace std;

char* arguments[3];
FILE* fd;
const char* logFilePath = "/home/BluetoothProject/Logs/fileMonitorLogs.txt";
char* rfcommPath = (char*)"/home/BluetoothProject/RFCOMMOut.py";
void logToFile(const char*);
void doWork();

void logToFile(const char* str) 
    fd = fopen(logFilePath, "a");
    fprintf(fd, "%s\n", str);
    fclose(fd);


int main() 
    arguments[0] = (char*)"python";
    arguments[1] = rfcommPath;
    arguments[2] = NULL;
    pid_t pid = fork();
    if(pid < 0) 
        printf("Fork failed");
        exit(1);
     else if(pid > 0) 
        exit(EXIT_SUCCESS);
    
    umask(0);
    pid_t sid = setsid();
    if(sid < 0) 
        logToFile("setsid() didn't work.");
        exit(1);
    
    if ((chdir("/")) < 0) 
                logToFile("chdir() didn't work.");
                exit(EXIT_FAILURE);
        
        close(STDIN_FILENO);
        close(STDOUT_FILENO);
        close(STDERR_FILENO);
    doWork();


void doWork() 
    pid_t pid = fork();
    if(pid < 0) 
        logToFile("doWork() fork didn't work.");
     else if(pid > 0) 
        int status = 0;
        waitpid(pid, &status, 0);
        if(WEXITSTATUS(status) == 1) 
            logToFile("Child process exited with an error.");
        
     else 
        int error = execvp(arguments[0], arguments);   //Here is where the error is
        if(error == -1) 
            logToFile("execvp() failed.");
        
        exit(1);

Python脚本（又名RFCOMMOut.py）

import RPi.GPIO as gpio
import serial
led_state = 0
led_pin = 11
gpio.setmode(gpio.BOARD)
gpio.setwarnings(False)
gpio.setup(led_pin, gpio.OUT)
try:
    ser = serial.Serial(port = '/dev/rfcomm0',
            baudrate = 9600,
            parity = serial.PARITY_NONE,
            stopbits = serial.STOPBITS_ONE,
            bytesize = serial.EIGHTBITS)
except IOException as e:
    logFile = open("/home/BluetoothProject/Logs/fileMonitorLogs.txt", "a")
        logFile.write("(First error handler) There was an exception:\n")
        logFile.write(str(e))
    logFile.write("\n")
        logFile.close()

#gpio.output

def process_input(input):
    global led_state
        if input == "I have been sent.\n":
                if led_state == 1:
            led_state = 0
            gpio.output(led_pin, led_state)
        else:
            led_state = 1
            gpio.output(led_pin, led_state)

while True:
    try:
        transmission = ser.readline()
        process_input(transmission)
    except IOError as e:
        logFile = open("/home/BluetoothProject/Logs/fileMonitorLogs.txt", "a")
        logFile.write("(second error handler) There was an exception:\n")
        logFile.write(str(e))
        logFile.write("\n")
        logFile.close()
        break
led_state = 0
gpio.output(led_pin, led_state)
gpio.cleanup()
print("End of program\n")