#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>

int main(int argc, char *argv[])
{
  if (argc != 2)
  {
    printf("Usage: %s file_name\n", argv[0]);
    exit(1);
  }

  int openFlags = O_CREAT | O_TRUNC | O_WRONLY;
  printf("open flags = 0x%04x\n", openFlags, 0777);

  int fd = open(argv[1], openFlags);
  if (fd == -1)
    printf("open failed: errno = %d, msg = '%s'\n", errno, strerror(errno));
  else
  {
    printf("open succeeded\n");
    close(fd);
  }
  exit(0);
}