在Linux系統中,有多種方法可以實現監控。這里,我將向您展示如何使用C++和一些常用的Linux庫來實現系統監控。
sys/sysinfo.h
庫獲取系統信息:#include <iostream>
#include <sys/sysinfo.h>
int main() {
struct sysinfo info;
if (sysinfo(&info) != 0) {
std::cerr << "獲取系統信息失敗" << std::endl;
return 1;
}
std::cout << "系統內存大小: " << info.totalram / (1024 * 1024) << "MB" << std::endl;
std::cout << "可用內存大小: " << info.freeram / (1024 * 1024) << "MB" << std::endl;
std::cout << "系統負載: " << info.loads[0] / (double)sysconf(_SC_NPROCESSORS_ONLN) << std::endl;
return 0;
}
/proc/stat
文件獲取CPU和內存使用情況:#include <iostream>
#include <fstream>
#include <string>
void read_cpu_info(const std::string &filename) {
std::ifstream file(filename);
if (!file.is_open()) {
std::cerr << "打開文件失敗" << std::endl;
return;
}
std::string line;
long long user, nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice;
while (getline(file, line)) {
sscanf(line.c_str(), "%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
&user, &nice, &system, &idle, &iowait, &irq, &softirq, &steal, &guest, &guest_nice);
std::cout << "用戶態CPU使用率: " << user / (double)sysconf(_SC_CLK_TCK) << "%" << std::endl;
std::cout << "系統態CPU使用率: " << system / (double)sysconf(_SC_CLK_TCK) << "%" << std::endl;
std::cout << "空閑CPU時間: " << idle / (double)sysconf(_SC_CLK_TCK) << "%" << std::endl;
}
}
void read_mem_info(const std::string &filename) {
std::ifstream file(filename);
if (!file.is_open()) {
std::cerr << "打開文件失敗" << std::endl;
return;
}
std::string line;
long long memtotal, memfree, buffers, cached, shmmem;
while (getline(file, line)) {
sscanf(line.c_str(), "%lld %lld %lld %lld %lld", &memtotal, &memfree, &buffers, &cached, &shmmem);
std::cout << "總內存大小: " << memtotal / (1024 * 1024) << "MB" << std::endl;
std::cout << "可用內存大小: " << memfree / (1024 * 1024) << "MB" << std::endl;
}
}
int main() {
read_cpu_info("/proc/stat");
read_mem_info("/proc/meminfo");
return 0;
}
inotify-tools
庫監控文件系統事件:首先,您需要安裝inotify-tools
庫。在Debian和Ubuntu系統中,可以使用以下命令安裝:
sudo apt-get install inotify-tools
在CentOS和RHEL系統中,可以使用以下命令安裝:
sudo yum install inotify-tools
接下來,您可以使用以下C++代碼監控文件系統事件:
#include <iostream>
#include <inotify.h>
#include <sys/inotify.h>
#include <unistd.h>
#define EVENT_SIZE ( sizeof (struct inotify_event) )
#define BUF_LEN ( 1024 * ( EVENT_SIZE + 16 ) )
int main() {
int length, i = 0;
int fd = inotify_init();
if (fd < 0) {
std::cerr << "inotify_init失敗" << std::endl;
return 1;
}
int wd = inotify_add_watch(fd, "/path/to/monitor", IN_MODIFY | IN_CREATE | IN_DELETE);
if (wd < 0) {
std::cerr << "inotify_add_watch失敗" << std::endl;
close(fd);
return 1;
}
char buffer[BUF_LEN];
while (1) {
length = read(fd, buffer, BUF_LEN);
if (length < 0) {
std::cerr << "read失敗" << std::endl;
break;
}
while (i < length) {
struct inotify_event *event = (struct inotify_event *)&buffer[i];
if (event->len) {
if (event->mask & IN_CREATE) {
std::cout << "文件或目錄已創建" << std::endl;
} else if (event->mask & IN_DELETE) {
std::cout << "文件或目錄已被刪除" << std::endl;
} else if (event->mask & IN_MODIFY) {
std::cout << "文件或目錄已修改" << std::endl;
}
}
i += EVENT_SIZE + event->len;
}
i = 0;
}
inotify_rm_watch(fd, wd);
close(fd);
return 0;
}
請注意,您需要將/path/to/monitor
替換為您要監控的文件或目錄的路徑。
這些方法可以幫助您實現Linux系統的監控。您可以根據自己的需求選擇合適的方法,并根據需要進行調整。
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