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/*
* fincore - count pages of file contents in core
*
* Copyright (C) 2017 Red Hat, Inc. All rights reserved.
* Written by Masatake YAMATO <yamato@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include "c.h"
#include "nls.h"
#include "closestream.h"
/* For large files, mmap is called in iterative way.
Window is the unit of vma prepared in each mmap
calling.
Window size depends on page size.
e.g. 128MB on x86_64. ( = N_PAGES_IN_WINDOW * 4096 ). */
#define N_PAGES_IN_WINDOW (32 * 1024)
static void __attribute__((__noreturn__)) usage(FILE *out)
{
const char *p = program_invocation_short_name;
if (!*p)
p = "fincore";
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] file...\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("fincore(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void report_count (const char *name, off_t file_size, off_t count_incore)
{
printf ("%-10lu %-10lu %s\n", count_incore, file_size, name);
}
static void report_failure (const char *name)
{
printf ("%-10s %-10ld %s\n", "failed", -1L, name);
}
static int do_mincore (void *window, const size_t len,
const char *name, const int pagesize,
off_t *count_incore)
{
static unsigned char vec[N_PAGES_IN_WINDOW];
int n = (len / pagesize) + ((len % pagesize)? 1: 0);
if (mincore (window, len, vec) < 0) {
warn(_("failed to do mincore: %s"), name);
return -errno;
}
while (n > 0)
{
if (vec[--n] & 0x1)
{
vec[n] = 0;
(*count_incore)++;
}
}
return 0;
}
static int fincore_fd (int fd,
const char *name, const int pagesize,
off_t file_size,
off_t *count_incore)
{
size_t window_size = N_PAGES_IN_WINDOW * pagesize;
off_t file_offset;
void *window = NULL;
int rc = 0;
int warned_once = 0;
for (file_offset = 0; file_offset < file_size; file_offset += window_size) {
size_t len;
len = file_size - file_offset;
if (len >= window_size)
len = window_size;
window = mmap(window, len, PROT_NONE, MAP_PRIVATE, fd, file_offset);
if (window == MAP_FAILED) {
if (!warned_once) {
rc = -EINVAL;
warn(_("failed to do mmap: %s"), name);
warned_once = 1;
}
break;
}
rc = do_mincore (window, len, name, pagesize, count_incore);
if (rc)
break;
munmap (window, len);
}
return rc;
}
static int fincore_name (const char *name,
const int pagesize, struct stat *sb,
off_t *count_incore)
{
int fd;
int rc = 0;
if ((fd = open (name, O_RDONLY)) < 0) {
warn(_("failed to open: %s"), name);
return 0;
}
if (fstat (fd, sb) < 0) {
warn(_("failed to do fstat: %s"), name);
return -errno;
}
/* Empty file is no error */
if (sb->st_size)
rc = fincore_fd (fd, name, pagesize, sb->st_size, count_incore);
close (fd);
return rc;
}
int main(int argc, char ** argv)
{
int c;
int pagesize;
int rc = EXIT_SUCCESS;
static const struct option longopts[] = {
{ "version", no_argument, NULL, 'V' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long (argc, argv, "Vh", longopts, NULL)) != -1) {
switch (c) {
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'h':
usage(stdout);
default:
errtryhelp(EXIT_FAILURE);
}
}
if (optind == argc) {
warnx(_("no file specified"));
errtryhelp(EXIT_FAILURE);
}
pagesize = getpagesize();
for(; optind < argc; optind++) {
char *name = argv[optind];
struct stat sb;
off_t count_incore = 0;
if (fincore_name (name, pagesize, &sb, &count_incore) == 0)
report_count (name, sb.st_size, count_incore);
else {
report_failure (name);
rc = EXIT_FAILURE;
}
}
return rc;
}
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