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char temp_file_namefilename[L_tmpnam];

if (tmpnam(temp_file_namefilename)) {
  /* temp_file_name may refer to an existing file */
  t_file = fopen(temp_file_namefilename,"wb+");
  if (!t_file) {
     /* Handle Error */
  }
}

char temp_namefilename[] = "/tmp/temp-XXXXXX";

if (mktemp(temp_namefilename) == NULL) {
  /* Handle Error */
}

/* A TOCTOU race condition exists here */

if ((fd = open(temp_namefilename, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, 0600)) == -1) {
  /* Handle Error */
}

char template[] = "/tmp/fileXXXXXXtemp-XXXXXX";
if ((fd = mkstemp(template)) == -1) {
   /* handleHandle error conditionError */
}

char sfn[15] = "/tmp/ed.temp-XXXXXX";
FILE *sfp;
int fd = -1;

if ((fd = mkstemp(sfn)) == -1) {
 || (sfp/* = fdopen(fd, "Handle Error */
}
 
if (sfp = fdopen(fd, "w+")) == NULL) {
  if (fd != -1) {
    unlink(sfn);
    close(fd);

} else }{
  /* handle error condition */
}

unlink(sfn); /* unlink immediately to allow name to be recycled*/
  /* use temporary file */
  fclose(sfp); /* note thisalso closes fd */
}