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/* free.c - a /proc implementation of free */
/* Dec14/92 by Brian Edmonds */
/* Thanks to Rafal Maszkowski for the Total line */
#include "proc/sysinfo.h"
#include "proc/version.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <getopt.h>
/* set this to whatever you want by default */
int byteshift = 10 ;
int total = 0;
int main( int argc, char **argv ) {
char buf1[80], buf2[80];
char *titles[6], name[32];
int i, n = 0, col[6] = {0}, rtime = 0, old_fmt = 0, first_line;
int old_meminfo = 0;
unsigned **mem;
static int sum[6]; /* statics get initialized to zero */
set_linux_version();
/* check startup flags */
while( (i = getopt( argc, argv, "bkmos:tV") ) != -1 )
switch (i) {
case 'b': byteshift = 0; break;
case 'k': byteshift = 10; break;
case 'm': byteshift = 20; break;
case 'o': old_fmt = 1; break;
case 's': rtime = 1000000 * atof(optarg); break;
case 't': total = 1; break;
case 'V': display_version(); exit(0);
default:
fprintf(stderr, "usage: %s [-b|-k|-m] [-o] [-s delay] [-t] [-V]\n", argv[0]);
return 1;
}
/* redirect stdin to /proc/meminfo */
if (linux_version_code < LINUX_VERSION(2,0,0)) {
close(0);
if (open( "/proc/meminfo", O_RDONLY ) < 0) {
perror("open");
return 2;
}
}
do {
if (linux_version_code < LINUX_VERSION(2,0,0)) {
for(i=0; i<6; i++)
sum[i]=0;
first_line = 1;
/* get the column titles */
fseek(stdin, 0L, SEEK_SET);
fgets( buf1, 80, stdin );
for (i=0; i<6; i++) {
titles[i] = strtok( ( i ? NULL : buf1 ), " \t:\n" );
if (!titles[i]) {
if (i != 5) {
fprintf( stderr, "free: error reading /proc/meminfo\n" );
return 3;
} else
++old_meminfo;
}
}
if (old_meminfo) {
fprintf(stdout, "%-7s %10s %10s %10s %10s %10s\n",
"", titles[0], titles[1], titles[2], titles[3],
titles[4]);
} else {
fprintf(stdout, "%-7s %10s %10s %10s %10s %10s %10s\n",
"", titles[0], titles[1], titles[2], titles[3],
titles[4], titles[5]);
}
/* read and translate data lines */
while (fgets(buf2, 80, stdin)) {
if (old_meminfo) {
n = sscanf(buf2, "%s %d %d %d %d %d", name,
&col[0], &col[1], &col[2], &col[3], &col[4]);
} else {
n = sscanf(buf2, "%s %d %d %d %d %d %d", name,
&col[0], &col[1], &col[2], &col[3], &col[4],
&col[5]);
}
if (n < 4)
continue;
fprintf( stdout, "%-7s", name );
for (i=1 ; i<n ; i++) {
fprintf(stdout, " %10d", col[i-1]>>byteshift);
sum[i-1] += col[i-1];
}
fputc('\n', stdout);
if (first_line && !old_fmt) {
first_line = 0;
fprintf( stdout, "-/+ buffers: %16d %10d\n",
(col[1] - col[4] - col[5])>>byteshift,
(col[2] + col[4] + col[5])>>byteshift);
}
}
if (total == 1) {
fprintf( stdout, "Total: ");
for( i=1 ; i<n ; i++ )
fprintf(stdout, " %10d", sum[i-1]>>byteshift);
fputc('\n', stdout);
}
} else {
/* memory printing from top.c using meminfo() */
if (!(mem = meminfo ()) || mem[meminfo_main][meminfo_total] == 0) {
fprintf (stderr, "Cannot get size of memory from /proc/meminfo\n");
exit (1);
}
printf(" total used free shared buffers cached\n");
printf ("%-7s %10d %10d %10d %10d %10d %10d\n", "Mem:",
mem[meminfo_main][meminfo_total] >> byteshift,
mem[meminfo_main][meminfo_used] >> byteshift,
mem[meminfo_main][meminfo_free] >> byteshift,
mem[meminfo_main][meminfo_shared] >> byteshift,
mem[meminfo_main][meminfo_buffers] >> byteshift,
mem[meminfo_main][meminfo_cached] >> byteshift);
if (!old_fmt) printf("-/+ buffers/cache: %10d %10d\n",
(mem[meminfo_main][meminfo_used]
-mem[meminfo_main][meminfo_buffers]
-mem[meminfo_main][meminfo_cached])>> byteshift,
(mem[meminfo_main][meminfo_free]
+mem[meminfo_main][meminfo_buffers]
+mem[meminfo_main][meminfo_cached])>> byteshift);
printf ("%-7s %10d %10d %10d\n", "Swap:",
mem[meminfo_swap][meminfo_total] >> byteshift,
mem[meminfo_swap][meminfo_used] >> byteshift,
mem[meminfo_swap][meminfo_free] >> byteshift);
if (total == 1) printf("%-7s %10d %10d %10d\n", "Total:",
(mem[meminfo_main][meminfo_total] +
mem[meminfo_swap][meminfo_total]) >> byteshift,
(mem[meminfo_main][meminfo_used] +
mem[meminfo_swap][meminfo_used]) >> byteshift,
(mem[meminfo_main][meminfo_free] +
mem[meminfo_swap][meminfo_free]) >> byteshift);
}
if (rtime) {
fputc('\n', stdout);
usleep(rtime);
}
} while (rtime);
return 0;
}
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