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

if ((fd = mkstemp(sfn)) == -1) {
  /* Handle Error */
}

unlink(sfn); /* unlink immediately to allow name to be recycled */

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

unlink(sfn); /* unlink immediately to allow name to be recycled*/
/* use temporary file */

fclose(sfp); /* also closes fd */