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procps/free.c
Craig Small ccb6ae8de1 library: cleanup of library includes 
The includes used to define a lot of things a library include
should not. It was also a bit messy what was exposed in the library
and what was not.

get_pid_digits -> procps_pid_length and exported correctly

MALLOC attribute move into relevant .c files
NORETURN attribute moved to relevant .c, not used in library
PURE attribute removed, it wasn't used
KLONG/KLF/STRTOUKL were fixed for long, so now just use long

HIDDEN attribute removed. It was for 3 functions. The PROCPS_EXPORT
seems to do the same (opposite) thing.

likely/unlikely removed from most places, its highly debateable
this does anything useful as CPUs have gotten smarter about branches.

Re-arranged the includes, ALL external programs should just #include
<proc/procps.h> then proc/procps.h includes headers for files that
have exported functions. procps.h and the headers it includes should
not use items that are not exportable (e.g. hidden functions or
macros) they go in procps-private.h
2016-04-16 17:03:57 +10:00

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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 "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>
#include <proc/procps.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;
struct procps_meminfo *mem_info;
/*
* 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);
}
if (procps_meminfo_new(&mem_info) < 0)
xerrx(EXIT_FAILURE,
_("Unable to create meminfo structure"));
do {
if (procps_meminfo_read(mem_info) < 0)
xerrx(EXIT_FAILURE,
_("Unable to read meminfo information"));
/* 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(procps_meminfo_get(mem_info, PROCPS_MEM_TOTAL), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_USED), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_FREE), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_SHARED), flags, args));
if (flags & FREE_WIDE) {
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_BUFFERS),
flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_CACHED)
, flags, args));
} else {
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_BUFFERS)+
procps_meminfo_get(mem_info, PROCPS_MEM_CACHED), flags, args));
}
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEM_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(procps_meminfo_get(mem_info, PROCPS_MEMLO_TOTAL), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEMLO_USED), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEMLO_FREE), flags, args));
printf("\n");
printf("%-7s", _("High:"));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEMHI_TOTAL), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEMHI_USED), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_MEMHI_FREE), flags, args));
printf("\n");
}
printf("%-7s", _("Swap:"));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_SWAP_TOTAL), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_SWAP_USED), flags, args));
printf(" %11s", scale_size(procps_meminfo_get(mem_info, PROCPS_SWAP_FREE), flags, args));
printf("\n");
if (flags & FREE_TOTAL) {
printf("%-7s", _("Total:"));
printf(" %11s", scale_size(
procps_meminfo_get(mem_info, PROCPS_MEM_TOTAL)+
procps_meminfo_get(mem_info, PROCPS_SWAP_TOTAL), flags, args));
printf(" %11s", scale_size(
procps_meminfo_get(mem_info, PROCPS_MEM_USED)+
procps_meminfo_get(mem_info, PROCPS_SWAP_USED), flags, args));
printf(" %11s", scale_size(
procps_meminfo_get(mem_info, PROCPS_MEM_FREE)+
procps_meminfo_get(mem_info, PROCPS_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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