libwpa_client control example

control.c

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

#define CTRL_INTERFACE_DIR "/var/run/wpa_supplicant/wlan0"  

int main(int argc, char *argv[]) {

  struct wpa_ctrl *ctrl_conn;

  char cmd[] = "SCAN_RESULTS";
  size_t cmd_len = sizeof(cmd);
  char reply[8192] = {0};
  size_t reply_len = sizeof(reply);

  ctrl_conn = wpa_ctrl_open(CTRL_INTERFACE_DIR);

  if(wpa_ctrl_request(ctrl_conn, cmd, cmd_len, reply, &reply_len, NULL) != 0) {
    fprintf(stderr, "Request failed\n");
    return -1;
  }

  fprintf(stdout, "scan results = \n%s\n", reply);

  return 0;
}