c - 无法成功使用 "execve()"

Question

该程序的目的是派生一个新的子进程并执行一个也有命令行参数的进程。如果我输入 /bin/ls --help，我得到错误:

shadyabhi@shadyabhi-desktop:~/lab/200801076_lab3$ ./a.out
Enter the name of the executable(with full path)/bin/ls --help
Starting the executable as a new child process...
Binary file to be executed: /bin/ls
/bin/ls: unrecognized option '--help
'
Try `/bin/ls --help' for more information.
Status returned by Child process: 2
shadyabhi@shadyabhi-desktop:~/lab/200801076_lab3$

execve() 的正确参数是什么？

#include<stdio.h>
#include<string.h>      //strcpy() used
#include<malloc.h>      //malloc() used
#include<unistd.h>      //fork() used
#include<stdlib.h>      //exit() function used
#include<sys/wait.h>    //waitpid() used

int main(int argc, char **argv)
{
    char command[256];
    char **args=NULL;
    char *arg;
    int count=0;
    char *binary;
    pid_t pid;
    printf("Enter the name of the executable(with full path)");
    fgets(command,256,stdin);
    binary=strtok(command," ");
    args=malloc(sizeof(char*)*10);
    args[0]=malloc(strlen(binary)+1);
    strcpy(args[0],binary);
    while ((arg=strtok(NULL," "))!=NULL)
    {
        if ( count%10 == 0) args=realloc(args,sizeof(char*)*10);
        count++;
        args[count]=malloc(strlen(arg));
        strcpy(args[count],arg);
    }
    args[++count]=NULL;
    if ((pid = fork()) == -1)
    {
        perror("Error forking...\n");
        exit(1);
    }
    if (pid == 0)
    {
        printf("Starting the executable as a new child process...\n");
        printf("Binary file to be executed: %s\n",binary);
        execve(args[0],args,NULL);
    }
    else
    {
        int status;
        waitpid(-1, &status, 0);
        printf("Status returned by Child process: %d\n",WEXITSTATUS(status));
    }
    return 0;
}

Answer 1

args 数组中的第一个条目应该再次是程序名称。您的代码以 --help 作为进程名称调用 /bin/ls。