Revert 175069

third_party/scrypt/lib/util/memlimit.c

Index: third_party/scrypt/lib/util/memlimit.c
===================================================================
--- third_party/scrypt/lib/util/memlimit.c	(revision 175254)
+++ third_party/scrypt/lib/util/memlimit.c	(working copy)
@@ -1,302 +0,0 @@
-/*-
- * Copyright 2009 Colin Percival
- * All rights reserved.
- *
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
- *
- * This file was originally written by Colin Percival as part of the Tarsnap
- * online backup system.
- */
-#include "scrypt_platform.h"
-
-#include <sys/types.h>
-#include <sys/resource.h>
-
-#ifdef HAVE_SYS_PARAM_H
-#include <sys/param.h>
-#endif
-#ifdef HAVE_SYSCTL_HW_USERMEM
-#include <sys/sysctl.h>
-#endif
-#ifdef HAVE_SYS_SYSINFO_H
-#include <sys/sysinfo.h>
-#endif
-
-#include <errno.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <unistd.h>
-
-#ifdef DEBUG
-#include <stdio.h>
-#endif
-
-#include "memlimit.h"
-
-#ifdef HAVE_SYSCTL_HW_USERMEM
-static int
-memlimit_sysctl_hw_usermem(size_t * memlimit)
-{
-	int mib[2];
-	uint8_t usermembuf[8];
-	size_t usermemlen = 8;
-	uint64_t usermem;
-
-	/* Ask the kernel how much RAM we have. */
-	mib[0] = CTL_HW;
-	mib[1] = HW_USERMEM;
-	if (sysctl(mib, 2, usermembuf, &usermemlen, NULL, 0))
-		return (1);
-
-	/*
-	 * Parse as either a uint64_t or a uint32_t based on the length of
-	 * output the kernel reports having copied out.  It appears that all
-	 * systems providing a sysctl interface for reading integers copy
-	 * them out as system-endian values, so we don't need to worry about
-	 * parsing them.
-	 */
-	if (usermemlen == sizeof(uint64_t))
-		usermem = *(uint64_t *)usermembuf;
-	else if (usermemlen == sizeof(uint32_t))
-		usermem = *(uint32_t *)usermembuf;
-	else
-		return (1);
-
-	/* Return the sysctl value, but clamp to SIZE_MAX if necessary. */
-#if UINT64_MAX > SIZE_MAX
-	if (usermem > SIZE_MAX)
-		*memlimit = SIZE_MAX;
-	else
-		*memlimit = usermem;
-#else
-	*memlimit = usermem;
-#endif
-
-	/* Success! */
-	return (0);
-}
-#endif
-
-/* If we don't HAVE_STRUCT_SYSINFO, we can't use sysinfo. */
-#ifndef HAVE_STRUCT_SYSINFO
-#undef HAVE_SYSINFO
-#endif
-
-/* If we don't HAVE_STRUCT_SYSINFO_TOTALRAM, we can't use sysinfo. */
-#ifndef HAVE_STRUCT_SYSINFO_TOTALRAM
-#undef HAVE_SYSINFO
-#endif
-
-#ifdef HAVE_SYSINFO
-static int
-memlimit_sysinfo(size_t * memlimit)
-{
-	struct sysinfo info;
-	uint64_t totalmem;
-
-	/* Get information from the kernel. */
-	if (sysinfo(&info))
-		return (1);
-	totalmem = info.totalram;
-
-	/* If we're on a modern kernel, adjust based on mem_unit. */
-#ifdef HAVE_STRUCT_SYSINFO_MEM_UNIT
-	totalmem = totalmem * info.mem_unit;
-#endif
-
-	/* Return the value, but clamp to SIZE_MAX if necessary. */
-#if UINT64_MAX > SIZE_MAX
-	if (totalmem > SIZE_MAX)
-		*memlimit = SIZE_MAX;
-	else
-		*memlimit = totalmem;
-#else
-	*memlimit = totalmem;
-#endif
-
-	/* Success! */
-	return (0);
-}
-#endif /* HAVE_SYSINFO */
-
-static int
-memlimit_rlimit(size_t * memlimit)
-{
-	struct rlimit rl;
-	uint64_t memrlimit;
-
-	/* Find the least of... */
-	memrlimit = (uint64_t)(-1);
-
-	/* ... RLIMIT_AS... */
-#ifdef RLIMIT_AS
-	if (getrlimit(RLIMIT_AS, &rl))
-		return (1);
-	if ((rl.rlim_cur != RLIM_INFINITY) &&
-	    ((uint64_t)rl.rlim_cur < memrlimit))
-		memrlimit = rl.rlim_cur;
-#endif
-
-	/* ... RLIMIT_DATA... */
-	if (getrlimit(RLIMIT_DATA, &rl))
-		return (1);
-	if ((rl.rlim_cur != RLIM_INFINITY) &&
-	    ((uint64_t)rl.rlim_cur < memrlimit))
-		memrlimit = rl.rlim_cur;
-
-	/* ... and RLIMIT_RSS. */
-#ifdef RLIMIT_RSS
-	if (getrlimit(RLIMIT_RSS, &rl))
-		return (1);
-	if ((rl.rlim_cur != RLIM_INFINITY) &&
-	    ((uint64_t)rl.rlim_cur < memrlimit))
-		memrlimit = rl.rlim_cur;
-#endif
-
-	/* Return the value, but clamp to SIZE_MAX if necessary. */
-#if UINT64_MAX > SIZE_MAX
-	if (memrlimit > SIZE_MAX)
-		*memlimit = SIZE_MAX;
-	else
-		*memlimit = memrlimit;
-#else
-	*memlimit = memrlimit;
-#endif
-
-	/* Success! */
-	return (0);
-}
-
-#ifdef _SC_PHYS_PAGES
-
-/* Some systems define _SC_PAGESIZE instead of _SC_PAGE_SIZE. */
-#ifndef _SC_PAGE_SIZE
-#define _SC_PAGE_SIZE _SC_PAGESIZE
-#endif
-
-static int
-memlimit_sysconf(size_t * memlimit)
-{
-	long pagesize;
-	long physpages;
-	uint64_t totalmem;
-
-	/* Set errno to 0 in order to distinguish "no limit" from "error". */
-	errno = 0;
-
-	/* Read the two limits. */
-	if (((pagesize = sysconf(_SC_PAGE_SIZE)) == -1) ||
-	    ((physpages = sysconf(_SC_PHYS_PAGES)) == -1)) {
-		/* Did an error occur? */
-		if (errno != 0)
-			return (1);
-
-		/* If not, there is no limit. */
-		totalmem = (uint64_t)(-1);
-	} else {
-		/* Compute the limit. */
-		totalmem = (uint64_t)(pagesize) * (uint64_t)(physpages);
-	}
-
-	/* Return the value, but clamp to SIZE_MAX if necessary. */
-#if UINT64_MAX > SIZE_MAX
-	if (totalmem > SIZE_MAX)
-		*memlimit = SIZE_MAX;
-	else
-		*memlimit = totalmem;
-#else
-	*memlimit = totalmem;
-#endif
-
-	/* Success! */
-	return (0);
-}
-#endif
-
-int
-memtouse(size_t maxmem, double maxmemfrac, size_t * memlimit)
-{
-	size_t sysctl_memlimit, sysinfo_memlimit, rlimit_memlimit;
-	size_t sysconf_memlimit;
-	size_t memlimit_min;
-	size_t memavail;
-
-	/* Get memory limits. */
-#ifdef HAVE_SYSCTL_HW_USERMEM
-	if (memlimit_sysctl_hw_usermem(&sysctl_memlimit))
-		return (1);
-#else
-	sysctl_memlimit = (size_t)(-1);
-#endif
-#ifdef HAVE_SYSINFO
-	if (memlimit_sysinfo(&sysinfo_memlimit))
-		return (1);
-#else
-	sysinfo_memlimit = (size_t)(-1);
-#endif
-	if (memlimit_rlimit(&rlimit_memlimit))
-		return (1);
-#ifdef _SC_PHYS_PAGES
-	if (memlimit_sysconf(&sysconf_memlimit))
-		return (1);
-#else
-	sysconf_memlimit = (size_t)(-1);
-#endif
-
-#ifdef DEBUG
-	fprintf(stderr, "Memory limits are %zu %zu %zu %zu\n",
-	    sysctl_memlimit, sysinfo_memlimit, rlimit_memlimit,
-	    sysconf_memlimit);
-#endif
-
-	/* Find the smallest of them. */
-	memlimit_min = (size_t)(-1);
-	if (memlimit_min > sysctl_memlimit)
-		memlimit_min = sysctl_memlimit;
-	if (memlimit_min > sysinfo_memlimit)
-		memlimit_min = sysinfo_memlimit;
-	if (memlimit_min > rlimit_memlimit)
-		memlimit_min = rlimit_memlimit;
-	if (memlimit_min > sysconf_memlimit)
-		memlimit_min = sysconf_memlimit;
-
-	/* Only use the specified fraction of the available memory. */
-	if ((maxmemfrac > 0.5) || (maxmemfrac == 0.0))
-		maxmemfrac = 0.5;
-	memavail = maxmemfrac * memlimit_min;
-
-	/* Don't use more than the specified maximum. */
-	if ((maxmem > 0) && (memavail > maxmem))
-		memavail = maxmem;
-
-	/* But always allow at least 1 MiB. */
-	if (memavail < 1048576)
-		memavail = 1048576;
-
-#ifdef DEBUG
-	fprintf(stderr, "Allowing up to %zu memory to be used\n", memavail);
-#endif
-
-	/* Return limit via the provided pointer. */
-	*memlimit = memavail;
-	return (0);
-}