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#include <stdio.h>
#include <sys/sysinfo.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int opt;
struct sysinfo info;
unsigned int shift;
while ((opt = getopt(argc, argv, "hmtbs")) != -1) {
switch (opt) {
case 'b': /* bytes */
shift = 0;
break;
case 'k': /* kibibytes */
shift = 10;
break;
case 'm': /* mebibytes */
shift = 20;
break;
case 'g': /* gibibytes */
shift = 30;
break;
default:
goto usage;
}
}
if (sysinfo(&info) < 0)
perror("sysinfo");
printf(" %13s%13s%13s%13s%13s\n", "total", "used", "free", "shared", "buffers");
printf("Mem: %13llu%13llu%13llu%13llu%13llu\n", (unsigned long long)((info.totalram * info.mem_unit) >> shift),
(unsigned long long)(((info.totalram - info.freeram) * info.mem_unit) >> shift),
(unsigned long long)((info.freeram * info.mem_unit) >> shift),
(unsigned long long)((info.sharedram * info.mem_unit) >> shift),
(unsigned long long)((info.bufferram * info.mem_unit) >> shift));
printf("-/+ buffers/cache:%13llu%13llu\n",
(unsigned long long)(((info.totalram - info.freeram - info.bufferram) * info.mem_unit) >> shift),
(unsigned long long)(((info.freeram + info.bufferram) * info.mem_unit) >> shift));
printf("Swap:%13llu%13llu%13llu\n", (unsigned long long)((info.totalswap * info.mem_unit) >> shift),
(unsigned long long)(((info.totalswap - info.freeswap) * info.mem_unit) >> shift),
(unsigned long long)((info.freeswap * info.mem_unit) >> shift));
return 0;
usage:
write(STDOUT_FILENO, "usage: free [-hmtbs]\n", 21);
return 0;
}
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