CODEWITHSUNDEEP
cpermissionsforkexec
Mike
Mike

Reputation: 63

execvp returns with perimission denied error in c

I want to write a program that uses exec in order to mutate a child and use it to do a curtain action. The child has to calculate a simple equation (-,+,*,/). When I try to access the file using execvp I get the following error:

execvp() failed!: Permission denied

Anyone has an idea what have I done wrong? Here is my code down below.

int main()
{
    signal(SIGCHLD, SIG_IGN);   //ignore child signal from now on
    pid_t status;
    char *a[2] = { "calculator", "2+1", NULL };

    status = fork();
    if (status != 0)
    {
        do_child(0, a);
    }


    return EXIT_SUCCESS;
}

/*
 *  id 0: calculator
 *  id 1: factorial
 *  id 2: pid
 */

 void do_child(int id, const char *args[])
 {
    switch (id) {
    case 0:
        if (execvp("../ex2cFactorial/ex2cCalculator.c", args) != 0)
        {
            perror("execvp() failed!");
            exit(EXIT_FAILURE);
        }
        break;
        //other cases (haven't been written yet)
    }
 }

Upvotes: 0

Views: 2145

Answers (1)

yLaguardia
yLaguardia

Reputation: 595

ex2cCalculator.c is a probably a source file, what you need there is the name of the executable (ex2cCalculator, a.out whatever)

There are also excess elements in the array initializer. It should be char *a[3] = { "calculator", "2+1", NULL };

Upvotes: 2

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