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snprintf+writev -> dprintf

Much simpler.

Dropping writev makes the output from summary() non-atomic, so
output lines triggered by SIGINFO can intermingle with output
lines triggered by SIGINT or atexit(3).

This behavior is difficult to trigger, even deliberately.

The buffer in dprintf is large enough so that lines produced by
summary() are not garbled if this occurs, though, so this is unlikely
to break any scripts.

Discussed at length with deraadt@, who helpfully noted that
"not all problems have perfect solutions."

ok millert@

/*	$OpenBSD: misc.c,v 1.23 2018/04/07 18:52:39 cheloha Exp $	*/
/*	$NetBSD: misc.c,v 1.4 1995/03/21 09:04:10 cgd Exp $	*/

/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego and Lance
 * Visser of Convex Computer Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/time.h>

#include <errno.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>

#include "dd.h"
#include "extern.h"

void
summary(void)
{
	struct timespec elapsed, now;
	double nanosecs;

	if (ddflags & C_NOINFO)
		return;

	clock_gettime(CLOCK_MONOTONIC, &now);
	timespecsub(&now, &st.start, &elapsed);
	nanosecs = ((double)elapsed.tv_sec * 1000000000) + elapsed.tv_nsec;
	if (nanosecs == 0)
		nanosecs = 1;

	/* Be async safe: use dprintf(3). */
	dprintf(STDERR_FILENO, "%zu+%zu records in\n%zu+%zu records out\n",
	    st.in_full, st.in_part, st.out_full, st.out_part);

	if (st.swab) {
		dprintf(STDERR_FILENO, "%zu odd length swab %s\n",
		    st.swab, (st.swab == 1) ? "block" : "blocks");
	}
	if (st.trunc) {
		dprintf(STDERR_FILENO, "%zu truncated %s\n",
		    st.trunc, (st.trunc == 1) ? "block" : "blocks");
	}
	if (!(ddflags & C_NOXFER)) {
		dprintf(STDERR_FILENO,
		    "%lld bytes transferred in %lld.%03ld secs "
		    "(%0.0f bytes/sec)\n", (long long)st.bytes,
		    (long long)elapsed.tv_sec, elapsed.tv_nsec / 1000000,
		    ((double)st.bytes * 1000000000) / nanosecs);
	}
}

void
summaryx(int notused)
{
	int save_errno = errno;

	summary();
	errno = save_errno;
}

void
terminate(int signo)
{
	summary();
	_exit(128 + signo);
}