Linux中,可以用sysinfo來獲取系統相關信息。
Linux中,sysinfo是用來獲取系統相關信息的結構體。
函數聲明和原型:
#include <sys/sysinfo.h>
int sysinfo(struct sysinfo *info);
結構體信息:
在Linux 2.3.16中,結構體的信息是(單位是字節):
- struct sysinfo {
- long uptime;
- /* 啓動到現在經過的時間 */
- unsigned long loads[3];
- /* 1, 5, and 15 minute load averages */
- unsigned long totalram; /* 總的可用的內存大小 */
- unsigned long freeram; /* 還未被使用的內存大小 */
- unsigned long sharedram; /* 共享的存儲器的大小 */
- unsigned long bufferram; /* 緩衝區大小 */
- unsigned long totalswap; /* 交換區大小 */
- unsigned long freeswap; /* 還可用的交換區大小 */
- unsigned short procs; /* 當前進程數目 */
- char _f[22]; /* 64字節的補丁結構 */
- struct sysinfo {
- long uptime; /* 啓動到現在經過的時間 */
- unsigned long loads[3];
- /* 1, 5, and 15 minute load averages */
- unsigned long totalram; /* 總的可用的內存大小 */
- unsigned long freeram; /* 還未被使用的內存大小 */
- unsigned long sharedram; /* 共享的存儲器的大小*/
- unsigned long bufferram; /* 共享的存儲器的大小 */
- unsigned long totalswap; /* 交換區大小 */
- unsigned long freeswap; /* 還可用的交換區大小 */
- unsigned short procs; /* 當前進程數目 */
- unsigned long totalhigh; /* 總的高內存大小 */
- unsigned long freehigh; /* 可用的高內存大小 */
- unsigned int mem_unit; /* 以字節爲單位的內存大小 */
- char _f[20-2*sizeof(long)-sizeof(int)];
- /* libc5的補丁
- };
返回值:
操作成功返回0,錯誤返回-1;
樣例:
- #include <stdio.h>
- #include <linux/unistd.h> /* 包含調用 _syscallX 宏等相關信息*/
- #include <linux/kernel.h> /* 包含sysinfo結構體信息*/
- _syscall1(int, sysinfo, struct sysinfo*, info);
- //using namespace std;
- int main(int argc, char *agrv[])
- {
- struct sysinfo s_info;
- int error;
- error = sysinfo(&s_info);
- printf("\n\ncode error=%d\n",error);
- printf("Uptime = %ds\nLoad: 1 min%d / 5 min %d / 15 min %d\n"
- "RAM: total %d / free %d /shared%d\n"
- "Memory in buffers = %d\nSwap:total%d/free%d\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.totalswap, s_info.freeswap,
- s_info.procs);
- return 0;
- }
- #/home/chenhd/future> ./Sysinfo_1
- code error=0
- Uptime = 154s
- Load: 1 min22976 / 5 min 13888 / 15 min 5408
- RAM: total 128307200 / free 55656448 /shared263168000
- Memory in buffers = 263168000
- Swap:total50/free1073821804
- Number of processes = 1073823352
- #/home/chenhd/future>