Getting "execvp error: Bad address" while using 2D array of constant size

Question

When running the following code I get the error:

execvp error: Bad address

I am not sure why that is the case but I suspect that cmd[2] should be set to a NULL pointer. I couldn't figure out how to set a NULL pointer for a 2d array of constant size.

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

int main(void) {

    char cmd[10][10];
    strcpy(cmd[0], "ls");
    strcpy(cmd[1], "-1");

    int pid = fork();

    // child process
    if (pid == 0){

        execvp(cmd[0], (char *const *) cmd); 
        perror("execvp error"); 

    // parent process
    } else if (pid > 0){
        wait(NULL);

    // fork failure
    } else {
        perror("Child creation unsuccessful");

    }

    return 0;
}

Welcome to SO! See: stackoverflow.com/a/27542113/6243352

ggorlen
– ggorlen

2019-01-18 02:05:01 +00:00
Commented Jan 18, 2019 at 2:05 — ggorlen
– ggorlen, Commented Jan 18, 2019 at 2:05

user58697 · Accepted Answer · 2019-01-18 02:01:42Z

3

execvp takes an array of pointers. You give it a 2D array. They are quite different beasts. For starters, the array of pointers given to execvp must be NULL-terminated. With a 2D array it is not possible.

answered Jan 18, 2019 at 2:01

user58697

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