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

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

unlink(sfn); /* We unlink immediately to the allow name to be recycled */
/* The race condition here is inconsequential if the file was created with exclusive permissions (glibc >= 2.0.7) */
unlink(sfn);

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

/* use temporary file */

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