Linux sysinfo获取系统相关信息

Linux中,可以用sysinfo来获取系统相关信息。

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <linux/unistd.h>       /* for _syscallX macros/related stuff */
#include <linux/kernel.h>       /* for struct sysinfo */

//_syscall1(int, sysinfo, struct sysinfo *, info);

/* Note: if you copy directly from the nroff source, remember to
*        REMOVE the extra backslashes in the printf statement. */

int
main(void)
{
struct sysinfo s_info;
int error;

error = sysinfo(&s_info);
printf("code error = %d\n", error);
printf("Uptime = %lds\nLoad: 1 min %lu / 5 min %lu / 15 min %lu\n"
"RAM: total %lu / free %lu / shared %lu\n"
"Memory in buffers = %lu\nSwap: total %lu / free %lu\n"
"Number of processes = %d\n",
s_info.uptime, s_info.loads[0],
s_info.loads[1], s_info.loads[2],
s_info.totalram, s_info.freeram,
s_info.sharedram, s_info.bufferram,
s_info.totalswap, s_info.freeswap,
s_info.procs);
exit(EXIT_SUCCESS);
}

　　

code error = 0
Uptime = 47428s
Load: 1 min 192 / 5 min 2272 / 15 min 2976
RAM: total 1027239936 / free 249516032 / shared 0
Memory in buffers = 0
Swap: total 2147479552 / free 2092707840
Number of processes = 391