Question

Here i used below in code on linux.
using cp command in system function.

I know about system function it will return the 0 if command successfully executed.otherwise it will return error code.

If here i use proper source and destination path than i got output like this

Number == 0

If i give wrong source and destination path than i got

cp: cannot create regular file `/home/sam/test/test': No such file or directory
Number == 256

cp: cannot stat `/home/sam/main/test2/test': Not a directory
Number == 256

Here i want to know the error code of cp command what cp command return here.

My questions are here

1 System function return error code of cp command?
2 Can i get error code of cp command from source code of cp command?
3 i want to handle all types of error in this cp command.

code :

#include <stdlib.h>
#include <stdio.h>

void main()
{
    int a;
    a = system("cp /home/sam/main/test /home/sam");
    printf("Number == %d\n",a);
}

So any body please Explain me about this all

Answer 1

The correct way to user the return value of system is with the wait-specific macros.

if (WIFEXITED(a)) {
    int rc;
    rc = WEXITSTATUS(a);
    printf("Exit with status: %d\n", rc);
} else {
    /* Killed by a signal. */
}