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07642b8ea6
procps/free.c
Craig Small 97cde50b35 free: use correct end sentinel 
When scaling values, the last item was integer 0 but the loop checked
for character '0'.

This was reported by 付腾桂 Thanks for the report and patch.
2015-10-24 13:17:36 +11:00

427 lines
12 KiB
C
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/*
* free.c - free(1)
* procps-ng utility to display free memory information
*
* Copyright (C) 1992-2012
*
* Mostly new, Sami Kerola <kerolasa@iki.fi> 15 Apr 2011
* All new, Robert Love <rml@tech9.net> 18 Nov 2002
* Original by Brian Edmonds and Rafal Maszkowski 14 Dec 1992
*
* Copyright 2003 Robert Love
* Copyright 2004 Albert Cahalan
*
* 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 will 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 "config.h"
#include "proc/sysinfo.h"
#include "proc/version.h"
#include "c.h"
#include "nls.h"
#include "strutils.h"
#include "fileutils.h"
#include <locale.h>
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef SIZE_MAX
#define SIZE_MAX 32
#endif
#define FREE_HUMANREADABLE (1 << 1)
#define FREE_LOHI (1 << 2)
#define FREE_WIDE (1 << 3)
#define FREE_TOTAL (1 << 4)
#define FREE_SI (1 << 5)
#define FREE_REPEAT (1 << 6)
#define FREE_REPEATCOUNT (1 << 7)
struct commandline_arguments {
int exponent; /* demanded in kilos, magas... */
float repeat_interval; /* delay in seconds */
int repeat_counter; /* number of repeats */
};
/* function prototypes */
static void usage(FILE * out);
double power(unsigned int base, unsigned int expo);
static const char *scale_size(unsigned long size, int flags, struct commandline_arguments args);
static void __attribute__ ((__noreturn__))
usage(FILE * out)
{
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -b, --bytes show output in bytes\n"), out);
fputs(_(" --kilo show output in kilobytes\n"), out);
fputs(_(" --mega show output in megabytes\n"), out);
fputs(_(" --giga show output in gigabytes\n"), out);
fputs(_(" --tera show output in terabytes\n"), out);
fputs(_(" --peta show output in petabytes\n"), out);
fputs(_(" -k, --kibi show output in kibibytes\n"), out);
fputs(_(" -m, --mebi show output in mebibytes\n"), out);
fputs(_(" -g, --gibi show output in gibibytes\n"), out);
fputs(_(" --tebi show output in tebibytes\n"), out);
fputs(_(" --pebi show output in pebibytes\n"), out);
fputs(_(" -h, --human show human-readable output\n"), out);
fputs(_(" --si use powers of 1000 not 1024\n"), out);
fputs(_(" -l, --lohi show detailed low and high memory statistics\n"), out);
fputs(_(" -t, --total show total for RAM + swap\n"), out);
fputs(_(" -s N, --seconds N repeat printing every N seconds\n"), out);
fputs(_(" -c N, --count N repeat printing N times, then exit\n"), out);
fputs(_(" -w, --wide wide output\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(_(" --help display this help and exit\n"), out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("free(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
double power(unsigned int base, unsigned int expo)
{
return (expo == 0) ? 1 : base * power(base, expo - 1);
}
/* idea of this function is copied from top size scaling */
static const char *scale_size(unsigned long size, int flags, struct commandline_arguments args)
{
static char nextup[] = { 'B', 'K', 'M', 'G', 'T', 'P', 0 };
static char buf[BUFSIZ];
int i;
char *up;
float base;
if (flags & FREE_SI)
base = 1000.0;
else
base = 1024.0;
/* default output */
if (args.exponent == 0 && !(flags & FREE_HUMANREADABLE)) {
snprintf(buf, sizeof(buf), "%ld", size);
return buf;
}
if (!(flags & FREE_HUMANREADABLE)) {
if (args.exponent == 1) {
/* in bytes, which can not be in SI */
snprintf(buf, sizeof(buf), "%lld", ((long long int)size) * 1024);
return buf;
}
if (args.exponent == 2) {
if (!(flags & FREE_SI))
snprintf(buf, sizeof(buf), "%ld", size);
else
snprintf(buf, sizeof(buf), "%ld", (long int)(size / 0.9765625));
return buf;
}
if (args.exponent > 2) {
/* In desired scale. */
snprintf(buf, sizeof(buf), "%ld",
(long int)(size / power(base, args.exponent - 2))
);
return buf;
}
}
/* human readable output */
up = nextup;
for (i = 1; up[0] != 0; i++, up++) {
switch (i) {
case 1:
if (4 >= snprintf(buf, sizeof(buf), "%ld%c", (long)size * 1024, *up))
return buf;
break;
case 2:
if (!(flags & FREE_SI)) {
if (4 >= snprintf(buf, sizeof(buf), "%ld%c", size, *up))
return buf;
} else {
if (4 >=
snprintf(buf, sizeof(buf), "%ld%c",
(long)(size / 0.9765625), *up))
return buf;
}
break;
case 3:
case 4:
case 5:
case 6:
if (4 >=
snprintf(buf, sizeof(buf), "%.1f%c",
(float)(size / power(base, i - 2)), *up))
return buf;
if (4 >=
snprintf(buf, sizeof(buf), "%ld%c",
(long)(size / power(base, i - 2)), *up))
return buf;
break;
case 7:
break;
}
}
/*
* On system where there is more than exbibyte of memory or swap the
* output does not fit to column. For incoming few years this should
* not be a big problem (wrote at Apr, 2015).
*/
return buf;
}
static void check_unit_set(int *unit_set)
{
if (*unit_set)
xerrx(EXIT_FAILURE,
_("Multiple unit options doesn't make sense."));
*unit_set = 1;
}
int main(int argc, char **argv)
{
int c, flags = 0, unit_set = 0;
char *endptr;
struct commandline_arguments args;
/*
* For long options that have no equivalent short option, use a
* non-character as a pseudo short option, starting with CHAR_MAX + 1.
*/
enum {
SI_OPTION = CHAR_MAX + 1,
KILO_OPTION,
MEGA_OPTION,
GIGA_OPTION,
TERA_OPTION,
PETA_OPTION,
TEBI_OPTION,
PEBI_OPTION,
HELP_OPTION
};
static const struct option longopts[] = {
{ "bytes", no_argument, NULL, 'b' },
{ "kilo", no_argument, NULL, KILO_OPTION },
{ "mega", no_argument, NULL, MEGA_OPTION },
{ "giga", no_argument, NULL, GIGA_OPTION },
{ "tera", no_argument, NULL, TERA_OPTION },
{ "peta", no_argument, NULL, PETA_OPTION },
{ "kibi", no_argument, NULL, 'k' },
{ "mebi", no_argument, NULL, 'm' },
{ "gibi", no_argument, NULL, 'g' },
{ "tebi", no_argument, NULL, TEBI_OPTION },
{ "pebi", no_argument, NULL, PEBI_OPTION },
{ "human", no_argument, NULL, 'h' },
{ "si", no_argument, NULL, SI_OPTION },
{ "lohi", no_argument, NULL, 'l' },
{ "total", no_argument, NULL, 't' },
{ "seconds", required_argument, NULL, 's' },
{ "count", required_argument, NULL, 'c' },
{ "wide", no_argument, NULL, 'w' },
{ "help", no_argument, NULL, HELP_OPTION },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
/* defaults */
args.exponent = 0;
args.repeat_interval = 1000000;
args.repeat_counter = 0;
#ifdef HAVE_PROGRAM_INVOCATION_NAME
program_invocation_name = program_invocation_short_name;
#endif
setlocale (LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long(argc, argv, "bkmghltc:ws:V", longopts, NULL)) != -1)
switch (c) {
case 'b':
check_unit_set(&unit_set);
args.exponent = 1;
break;
case 'k':
check_unit_set(&unit_set);
args.exponent = 2;
break;
case 'm':
check_unit_set(&unit_set);
args.exponent = 3;
break;
case 'g':
check_unit_set(&unit_set);
args.exponent = 4;
break;
case TEBI_OPTION:
check_unit_set(&unit_set);
args.exponent = 5;
break;
case PEBI_OPTION:
check_unit_set(&unit_set);
args.exponent = 6;
break;
case KILO_OPTION:
check_unit_set(&unit_set);
args.exponent = 2;
flags |= FREE_SI;
break;
case MEGA_OPTION:
check_unit_set(&unit_set);
args.exponent = 3;
flags |= FREE_SI;
break;
case GIGA_OPTION:
check_unit_set(&unit_set);
args.exponent = 4;
flags |= FREE_SI;
break;
case TERA_OPTION:
check_unit_set(&unit_set);
args.exponent = 5;
flags |= FREE_SI;
break;
case PETA_OPTION:
check_unit_set(&unit_set);
args.exponent = 6;
flags |= FREE_SI;
break;
case 'h':
flags |= FREE_HUMANREADABLE;
break;
case SI_OPTION:
flags |= FREE_SI;
break;
case 'l':
flags |= FREE_LOHI;
break;
case 't':
flags |= FREE_TOTAL;
break;
case 's':
flags |= FREE_REPEAT;
errno = 0;
args.repeat_interval = (1000000 * strtof(optarg, &endptr));
if (errno || optarg == endptr || (endptr && *endptr))
xerrx(EXIT_FAILURE, _("seconds argument `%s' failed"), optarg);
if (args.repeat_interval < 1)
xerrx(EXIT_FAILURE,
_("seconds argument `%s' is not positive number"), optarg);
break;
case 'c':
flags |= FREE_REPEAT;
flags |= FREE_REPEATCOUNT;
args.repeat_counter = strtol_or_err(optarg,
_("failed to parse count argument"));
if (args.repeat_counter < 1)
error(EXIT_FAILURE, ERANGE,
_("failed to parse count argument: '%s'"), optarg);
break;
case 'w':
flags |= FREE_WIDE;
break;
case HELP_OPTION:
usage(stdout);
case 'V':
printf(PROCPS_NG_VERSION);
exit(EXIT_SUCCESS);
default:
usage(stderr);
}
do {
meminfo();
/* Translation Hint: You can use 9 character words in
* the header, and the words need to be right align to
* beginning of a number. */
if (flags & FREE_WIDE) {
printf(_(" total used free shared buffers cache available"));
} else {
printf(_(" total used free shared buff/cache available"));
}
printf("\n");
printf("%-7s", _("Mem:"));
printf(" %11s", scale_size(kb_main_total, flags, args));
printf(" %11s", scale_size(kb_main_used, flags, args));
printf(" %11s", scale_size(kb_main_free, flags, args));
printf(" %11s", scale_size(kb_main_shared, flags, args));
if (flags & FREE_WIDE) {
printf(" %11s", scale_size(kb_main_buffers, flags, args));
printf(" %11s", scale_size(kb_main_cached, flags, args));
} else {
printf(" %11s", scale_size(kb_main_buffers+kb_main_cached, flags, args));
}
printf(" %11s", scale_size(kb_main_available, flags, args));
printf("\n");
/*
* Print low vs. high information, if the user requested it.
* Note we check if low_total == 0: if so, then this kernel
* does not export the low and high stats. Note we still want
* to print the high info, even if it is zero.
*/
if (flags & FREE_LOHI) {
printf("%-7s", _("Low:"));
printf(" %11s", scale_size(kb_low_total, flags, args));
printf(" %11s", scale_size(kb_low_total - kb_low_free, flags, args));
printf(" %11s", scale_size(kb_low_free, flags, args));
printf("\n");
printf("%-7s", _("High:"));
printf(" %11s", scale_size(kb_high_total, flags, args));
printf(" %11s", scale_size(kb_high_total - kb_high_free, flags, args));
printf(" %11s", scale_size(kb_high_free, flags, args));
printf("\n");
}
printf("%-7s", _("Swap:"));
printf(" %11s", scale_size(kb_swap_total, flags, args));
printf(" %11s", scale_size(kb_swap_used, flags, args));
printf(" %11s", scale_size(kb_swap_free, flags, args));
printf("\n");
if (flags & FREE_TOTAL) {
printf("%-7s", _("Total:"));
printf(" %11s", scale_size(kb_main_total + kb_swap_total, flags, args));
printf(" %11s", scale_size(kb_main_used + kb_swap_used, flags, args));
printf(" %11s", scale_size(kb_main_free + kb_swap_free, flags, args));
printf("\n");
}
fflush(stdout);
if (flags & FREE_REPEATCOUNT) {
args.repeat_counter--;
if (args.repeat_counter < 1)
exit(EXIT_SUCCESS);
}
if (flags & FREE_REPEAT) {
printf("\n");
usleep(args.repeat_interval);
}
} while ((flags & FREE_REPEAT));
exit(EXIT_SUCCESS);
}
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