linux - 如何在linux中创建一个进程

Question

我正在尝试在 Linux 中创建一个进程，但我一直收到错误消息。在我的 C++ 代码中，我只想打开 firefox.exe。这是我的代码:

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

using namespace std;

//main function used to run program
int main()
{
    //declaration of a process id variable
    pid_t pid;

    //fork a child process is assigned 
    //to the process id
    pid=fork();

    //code to show that the fork failed
    //if the process id is less than 0
    if(pid<0)
    {
        fprintf(stderr, "Fork Failed");// error occurred
        exit(-1); //exit
    }

    //code that runs if the process id equals 0
    //(a successful for was assigned
    else if(pid==0)
    {
        //this statement creates a specified child process
        execlp("usr/bin","firefox",NULL);//child process
    }

    //code that exits only once a child 
    //process has been completed
    else
    {
        wait(NULL);//parent will wait for the child process to complete
        cout << pid << endl;

        printf("Child Complete");
        exit(0);
    }
}

wait() 函数出错。我忽略了这一点并进行了尝试，但没有任何反应。

Answer 1

你必须写:

execlp("/usr/bin/firefox","firefox",NULL);

您还需要在 execlp 之后放置一个 _exit，以防它失败。