165 lines
5.9 KiB
C
165 lines
5.9 KiB
C
/*
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* test.c
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* Copyright (C) 2021 light <light@lightdeMBP>
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*
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* Distributed under terms of the MIT license.
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*/
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#include "./include/test.h"
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#include<stdio.h>
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#include<dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_LINE 1024
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void updateMem(unsigned int *all, unsigned int *fre, float *useage) {
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char buf[MAX_LINE]; /*缓冲区*/
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FILE *fp; /*文件指针*/
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if((fp = fopen("./meminfo","r")) == NULL)
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{
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perror("fail to read");
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return;
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}
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fgets(buf,MAX_LINE,fp);
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sscanf(buf, "%*s %u kB",all);
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fgets(buf,MAX_LINE,fp);
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sscanf(buf, "%*s %u kB",fre);
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*useage = 1 - (float) *fre / *all;
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}
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/* pid 进程ID 0
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comm task_struct结构体的进程名
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state 进程状态, 此处为S
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ppid 父进程ID （父进程是指通过fork方式，通过clone并非父进程）
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pgrp 进程组ID
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session 进程会话组ID
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tty_nr 当前进程的tty终点设备号
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tpgid 控制进程终端的前台进程号
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flags 进程标识位，定义在include/linux/sched.h中的PF
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minflt 次要缺页中断的次数，即无需从磁盘加载内存页. 比如COW和匿名页
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cminfl 当前进程等待子进程的minflt
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majflt 主要缺页中断的次数，需要从磁盘加载内存页. 比如map文件
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majflt 当前进程等待子进程的majflt
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utime 该进程处于用户态的时间，单位jiffies 13
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stime 该进程处于内核态的时间，单位jiffies 14
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cutime 当前进程等待子进程的utime
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cstime 当前进程等待子进程的utime
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priority 进程优先级, 此次等于10.
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nice nice值，取值范围[19, -20]，此处等于-10
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num_threads 线程个数, 此处等于221
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itrealvalue 该字段已废弃，恒等于0
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starttime 自系统启动后的进程创建时间，单位jiffies
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vsize 进程的虚拟内存大小，单位为bytes 22
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rss 进程独占内存，单位pages，4K 23
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rsslim rss大小上限
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start_code 该任务在虚拟地址空间的代码段的起始地址
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end_code 该任务在虚拟地址空间的代码段的结束地址。
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start_stack 该任务在虚拟地址空间的栈的结束地址。
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kstkesp esp(32 位堆栈指针) 的当前值, 与在进程的内核堆栈页得到的一致。
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kstkeip 指向将要执行的指令的指针, EIP(32 位指令指针)的当前值。
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pendingsig 待处理信号的位图，记录发送给进程的普通信号。
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block_sig 阻塞信号的位图。
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sigign 忽略的信号的位图。
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sigcatch 被俘获的信号的位图。
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wchan 如果该进程是睡眠状态，该值给出调度的调用点。
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nswap 被swapped的页数，当前没用。
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cnswap 所有子进程被swapped 的页数的和，当前没用。
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exit_signal 该进程结束时，向父进程所发送的信号。
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task_cpu 运行在哪个 CPU 上。
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task_rt_priority 实时进程的相对优先级别。
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task_policy 进程的调度策略，0=非实时进程，1=FIFO实时进程；2=RR实时进程
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blio_ticks 等待阻塞IO的时间
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gtime guest time of the task in jiffies
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cgtime guest time of the task children in jiffies
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start_data address above which program data+bss is placed
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end_data address below which program data+bss is placed
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start_brk address above which program heap can be expanded with br
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*/
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int updateProcInfo(Proc_Info *proc) {
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char file_path[64] = {0};
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char buffer[MAX_LINE] = {0};
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sprintf(file_path, "./proc/%d/stat", proc->pid);
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FILE *fd = NULL;
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fd = fopen(file_path, "r");
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if (fd == NULL) {
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return -1;
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}
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unsigned long utime, stime, vsz, rss;
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fgets(buffer,MAX_LINE,fd);
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// 14 utime 15 stime 23 24 vsz rss
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// 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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sscanf(buffer, "%*s %s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %u %u %*s %*s %*s %*s %*s %*s %*s %*s %u %u ", proc->name, &utime, &stime, &vsz, &rss);
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printf("%d %s %d %d %d %d\n",proc->pid, proc->name, utime, stime, vsz, rss);
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if (proc->point == 29) {
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proc->point = 0;
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} else {
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proc->point ++;
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}
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proc->memInfo[proc->point].rss = rss;
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proc->memInfo[proc->point].vsz = vsz;
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proc->cpuInfo[proc->point].stime = stime;
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proc->cpuInfo[proc->point].utime = utime;
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fclose(fd);
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return 0;
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}
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unsigned int* getProcess() {
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static unsigned int ids[MaxCache] = {0};
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DIR *dirp;
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struct dirent *direntp;
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unsigned int id = 0;
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if ((dirp = opendir("./proc/")) == NULL) {
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exit(1);
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}
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int index = 0;
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int i;
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unsigned int temp;
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while ((direntp = readdir(dirp)) != NULL){
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id = atoi(direntp->d_name);
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if (id > 0) {
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for (i = 0; i < index; i++) {
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if (ids[i] > id) {
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temp = id;
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id = ids[i];
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ids[i] = temp;
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}
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}
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ids[index] = id;
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index ++;
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}
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}
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closedir(dirp);
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return &ids[0];
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}
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int foundProcess(Proc_Info *pList, unsigned int id) {
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int i;
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for (i = 0; i<MaxCache; i++) {
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if ((pList+i)->pid == id) {
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return i;
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}
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}
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return -1;
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}
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int assertProcess(Proc_Info *pList, unsigned int id) {
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int i, j;
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for (i =0; i<MaxCache;i++) {
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if ((pList+i)->pid == 0) {
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(pList+i)->pid = id;
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strcpy((pList+i)->name, "");
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(pList+i)->point = -1;
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for (j =0; j<30;j++) {
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(pList+i)->cpuInfo[j].utime = 0;
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(pList+i)->cpuInfo[j].stime = 0;
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(pList+i)->memInfo[j].vsz = 0;
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(pList+i)->memInfo[j].vsz = 0;
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}
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return i;
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}
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}
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return -1;
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}
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