Question

Calling system() to run an external .exe and checking error code upon errors:

#include <errno.h>       
#include <stdlib.h>

function()
{
    errno_t err;


      if( system(tailCmd) == -1) //if there is an error get errno
      {
          //Error calling tail.exe 
          _get_errno( &err );  

      }
}

First two compile errors:

error C2065: 'err' : undeclared identifier
error C2065: 'errno_t' : undeclared identifier

Not sure why as I am including the required and optional header files?
Any help is appreciated. Thank You.

Answer 1

A typical usage is like:

if (somecall() == -1) {
    int errsv = errno;
    printf("somecall() failed\n");
    if (errsv == ...) { ... }
}

which is taken from here.