〖Linux〗proc的一些文件读取操作
2024-08-26 01:24:17
/*
* =====================================================================================
*
* Filename: proc_more.c
*
* Description:
*
* Version: 1.0
* Created: 2013年08月07日 11时34分40秒
* Revision: none
* Compiler: gcc
*
* Author: linkscue (scue), linkscue@gmail.com
* Organization:
*
* =====================================================================================
*/ #include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
void sampleLoadAvg(){
int f=;
char buffer[]=""; /* 定义字符串并初始化为'\0' */
char buf[][];
char *file="/proc/loadavg";
f = open(file, O_RDONLY);
if (f == )
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
read(f, (void *)buffer, );
sscanf(buffer, "%s %s %s %s %s", /* sscanf()拆分成多个字符串 */
&buf[],&buf[],&buf[],&buf[],&buf[]);
printf("一分钟平均负载：%s\n", buf[]);
printf("五分钟平均负载：%s\n", buf[]);
printf("一刻钟平均负载：%s\n", buf[]);
printf("采样时刻的间隔：%s\n", buf[]);
printf("最大线程的数目：%s\n", buf[]);
close(f);
}
void sampleTime(){
int f=;
char buffer[]="";
char buf[][];
float seconds=;
float secondr=;
char *file="/proc/uptime";
f = open(file, O_RDONLY);
if (f == )
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
read(f, (void *)buffer, );
sscanf(buffer, "%s %s", &buf[], &buf[]);
close(f);
printf("系统运行时间：\t%s秒\n", buf[]);
printf("系统空闲时间：\t%s秒\n", buf[]);
close(f);
seconds=strtof(buf[],NULL);
secondr=strtof(buf[],NULL);
printf("系统运行时间：\t%03d天%02d时%02d分%02.6f秒\n",
(int)seconds/(*), /* 天 */
((int)seconds/())%(), /* 时 */
((int)seconds/)%, /* 分 */
((int)seconds%)+(seconds-(int)seconds)); /* 秒(精确至毫秒) */
printf("系统空闲时间：\t%03d天%02d时%02d分%02.6f秒\n",
(int)secondr/(*), /* 天 */
((int)secondr/())%(), /* 时 */
((int)secondr/)%, /* 分 */
((int)secondr%)+(secondr-(int)secondr)); /* 秒(精确至毫秒) */
} void sampleKernelVersion(){
int f=;
char buffer[]="";
char *file="/proc/sys/kernel/version";
f = open(file, O_RDONLY);
if (f == )
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
read(f, (void *)buffer, );
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
printf("当前内核版本：\t%s\n", buffer);
close(f);
} void sampleOsRelease(){
int f=;
char buffer[]="";
char *file="/proc/sys/kernel/osrelease";
f = open(file, O_RDONLY);
if (f == )
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
read(f, (void *)buffer, );
buffer[strlen(buffer)-]=;
printf("当前发行版本：\t%s\n", buffer);
close(f);
} void sampleOsType(){
int f=;
char buffer[]="";
char *file="/proc/sys/kernel/ostype";
f = open(file, O_RDONLY);
if (f == )
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
read(f, (void *)buffer, );
buffer[strlen(buffer)-]=;
printf("当前操作系统：\t%s\n", buffer);
close(f);
} void sampleDiskStat(){
int i;
FILE *fp;
int nread=;
ssize_t len = ;
char *buffer=NULL;
char buf[][];
char *file="/proc/diskstats";
char *p;
fp = fopen(file, "rb");
if (fp == NULL)
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
printf(" 磁盘 读次数 写次数\n");
while((nread = getline(&buffer, &len, fp)) != -) { /* 简单实现读行的功能 */
sscanf(buffer, "%04s%08s%s %s %s %s %s %s %s %s %s %s %s %s",
&buf[],&buf[],&buf[],&buf[],&buf[],&buf[],&buf[],
&buf[],&buf[],&buf[],&buf[],&buf[],&buf[],&buf[]);
if ((p=strstr(buf[], "loop"))!=NULL)
{
; /* loop本地回路不作操作 */
}
else {
printf("%06s%08s%08s\n",
&buf[],&buf[], &buf[]);
}
}
} void sampleProcesses(void)
{
FILE *fp;
int nread=;
ssize_t len = ;
char *buf=NULL;
char *buffer=NULL;
char *file="/proc/stat";
fp = fopen(file, "rb");
if (fp == NULL)
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
while((nread = getline(&buffer, &len, fp)) != -) {
if((buf=strstr(buffer, "processes"))!=NULL) /* 简单实现grep的功能 */
break;
}
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
char count[]="";
sscanf(buffer, "%s%s", count, count);
printf("执行线程数目:\t%s\n", count);
} void sampleContext(void)
{
FILE *fp;
int nread=;
ssize_t len = ;
char *buf=NULL;
char *buffer=NULL;
char *file="/proc/stat";
fp = fopen(file, "rb");
if (fp == NULL)
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
while((nread = getline(&buffer, &len, fp)) != -) {
if((buf=strstr(buffer, "ctxt"))!=NULL) /* 简单实现grep的功能 */
break;
}
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
char count[]="";
sscanf(buffer, "%s%s", count, count);
printf("上下文切换次数:\t%s\n", count);
} void sampleMeminfo()
{
FILE *fp;
int nread=;
ssize_t len = ;
char *buf=NULL;
char *buffer=NULL;
char *file="/proc/meminfo";
char content[]="";
fp = fopen(file, "rb");
if (fp == NULL)
{
printf("error to open: %s\n", file);
exit(EXIT_FAILURE);
}
while((nread = getline(&buffer, &len, fp)) != -) {
if((buf=strstr(buffer, "MemTotal"))!=NULL) /* 简单实现grep的功能 */
{
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
sscanf(buffer, "%s%s", content, content);
int memtotal_kb=(int)(strtof(content, NULL));
printf("内存总容量:\t%dG%4dM %4dK\n",
memtotal_kb/(*), /* Gb */
(memtotal_kb/())%, /* Mb */
(memtotal_kb%(*))%); /* Kb */
}
if((buf=strstr(buffer, "MemFree"))!=NULL) /* 简单实现grep的功能 */
{
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
sscanf(buffer, "%s%s", content, content);
int memfree_kb=(int)(strtof(content, NULL));
printf("内存可用容量:\t%dG%4dM %4dK\n",
memfree_kb/(*), /* Gb */
(memfree_kb/())%, /* Mb */
(memfree_kb%(*))%); /* Kb */
}
if((buf=strstr(buffer, "SwapTotal"))!=NULL) /* 简单实现grep的功能 */
{
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
sscanf(buffer, "%s%s", content, content);
int swaptotal_kb=(int)(strtof(content, NULL));
printf("SWAP总容量:\t%dG%4dM %4dK\n",
swaptotal_kb/(*), /* Gb */
(swaptotal_kb/())%, /* Mb */
(swaptotal_kb%(*))%); /* Kb */
}
if((buf=strstr(buffer, "SwapFree"))!=NULL) /* 简单实现grep的功能 */
{
buffer[strlen(buffer)-]=; /* 简单实现tr()函数的功能 */
sscanf(buffer, "%s%s", content, content);
int swapfree_kb=(int)(strtof(content, NULL));
printf("SWAP可用容量:\t%dG%4dM %4dK\n",
swapfree_kb/(*), /* Gb */
(swapfree_kb/())%, /* Mb */
(swapfree_kb%(*))%); /* Kb */
break; /* 所需的信息已满足，退出循环 */
}
}
}
/*
* === FUNCTION ======================================================================
* Name: main
* Description:
* =====================================================================================
*/
int main ( int argc, char *argv[] )
{
printf(">>>系统负载<<<\n");
sampleLoadAvg();
printf("----------------------------------------\n");
printf("\n");
printf(">>>运行时间<<<\n");
sampleTime();
printf("\n");
printf(">>>版本信息<<<\n");
sampleOsType();
sampleOsRelease();
sampleKernelVersion();
printf("----------------------------------------\n");
printf("\n");
printf(">>>磁盘信息<<<\n");
sampleDiskStat();
printf("----------------------------------------\n");
printf("\n");
printf(">>>上下文切换<<<\n");
sampleContext();
printf("----------------------------------------\n");
printf("\n");
printf(">>>线程数目<<<\n");
sampleProcesses();
printf("----------------------------------------\n");
printf("\n");
printf(">>>内存信息<<<\n");
sampleMeminfo();
printf("----------------------------------------\n");
return EXIT_SUCCESS;
}
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