warning: assignment makes integer from pointer without a cast

Here is the code I wrote to detect whether a LAN cable is pluged or unpluged. After compilation, it gives me the warning:

Code:

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warning: assignment makes integer from pointer without a cast

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Here is my code:

Code:

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

#define yes 1
#define no 0
typedef int boolean;

int main()
{
  FILE *fp;
  char *pch;
  char line[130];                        /* line of easa!from unix command*/
  int m;
  boolean b;
 
  fp = popen("nm-tool | grep Link", "r");                /* Issue the command.                */

                                        /* Read a line                        */
  while ( fgets( line, sizeof line, fp))
  {
    printf("%s", line);
  }
  pclose(fp);

  pch = strtok (line,"        ");
  for (m=0; m<2; m++)
  {
    pch = strtok (NULL, "        ");
  }
    printf ("%s\n",pch);
  b = pch;
  printf("%d\n",b);                /* more to add on */

  return 0;
}

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I have googled some solutions online, like include the stdlib.h header and etc but all didn't work. Does anyone has any idea on it?

Thanks in advance.

Change:

Code:

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b = pch;

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to:

Code:

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b = pch != NULL;

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