1 /*
2 * =====================================================================================
3 *
4 * Filename: proc_more.c
5 *
6 * Description:
7 *
8 * Version: 1.0
9 * Created: 2013年08月07日 11时34分40秒
10 * Revision: none
11 * Compiler: gcc
12 *
13 * Author: linkscue (scue), linkscue@gmail.com
14 * Organization:
15 *
16 * =====================================================================================
17 */
18
19 #include <stdio.h>
20 #include <sys/time.h>
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #include <unistd.h>
24 #include <fcntl.h>
25 #include <stdlib.h>
26 #include <string.h>
27 void sampleLoadAvg(){
28 int f=0;
29 char buffer[80]=""; /* 定义字符串并初始化为'\0' */
30 char buf[5][10];
31 char *file="/proc/loadavg";
32 f = open(file, O_RDONLY);
33 if (f == 0)
34 {
35 printf("error to open: %s\n", file);
36 exit(EXIT_FAILURE);
37 }
38 read(f, (void *)buffer, 80);
39 sscanf(buffer, "%s %s %s %s %s", /* sscanf()拆分成多个字符串 */
40 &buf[0],&buf[1],&buf[2],&buf[3],&buf[4]);
41 printf("一分钟平均负载：%s\n", buf[0]);
42 printf("五分钟平均负载：%s\n", buf[1]);
43 printf("一刻钟平均负载：%s\n", buf[2]);
44 printf("采样时刻的间隔：%s\n", buf[3]);
45 printf("最大线程的数目：%s\n", buf[4]);
46 close(f);
47 }
48 void sampleTime(){
49 int f=0;
50 char buffer[80]="";
51 char buf[2][10];
52 float seconds=0;
53 float secondr=0;
54 char *file="/proc/uptime";
55 f = open(file, O_RDONLY);
56 if (f == 0)
57 {
58 printf("error to open: %s\n", file);
59 exit(EXIT_FAILURE);
60 }
61 read(f, (void *)buffer, 80);
62 sscanf(buffer, "%s %s", &buf[0], &buf[1]);
63 close(f);
64 printf("系统运行时间：\t%s秒\n", buf[0]);
65 printf("系统空闲时间：\t%s秒\n", buf[1]);
66 close(f);
67 seconds=strtof(buf[0],NULL);
68 secondr=strtof(buf[1],NULL);
69 printf("系统运行时间：\t%03d天%02d时%02d分%02.6f秒\n",
70 (int)seconds/(24*3600), /* 天 */
71 ((int)seconds/(3600))%(24), /* 时 */
72 ((int)seconds/60)%60, /* 分 */
73 ((int)seconds%60)+(seconds-(int)seconds)); /* 秒(精确至毫秒) */
74 printf("系统空闲时间：\t%03d天%02d时%02d分%02.6f秒\n",
75 (int)secondr/(24*3600), /* 天 */
76 ((int)secondr/(3600))%(24), /* 时 */
77 ((int)secondr/60)%60, /* 分 */
78 ((int)secondr%60)+(secondr-(int)secondr)); /* 秒(精确至毫秒) */
79 }
80
81 void sampleKernelVersion(){
82 int f=0;
83 char buffer[80]="";
84 char *file="/proc/sys/kernel/version";
85 f = open(file, O_RDONLY);
86 if (f == 0)
87 {
88 printf("error to open: %s\n", file);
89 exit(EXIT_FAILURE);
90 }
91 read(f, (void *)buffer, 80);
92 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
93 printf("当前内核版本：\t%s\n", buffer);
94 close(f);
95 }
96
97 void sampleOsRelease(){
98 int f=0;
99 char buffer[80]="";
100 char *file="/proc/sys/kernel/osrelease";
101 f = open(file, O_RDONLY);
102 if (f == 0)
103 {
104 printf("error to open: %s\n", file);
105 exit(EXIT_FAILURE);
106 }
107 read(f, (void *)buffer, 80);
108 buffer[strlen(buffer)-1]=0;
109 printf("当前发行版本：\t%s\n", buffer);
110 close(f);
111 }
112
113 void sampleOsType(){
114 int f=0;
115 char buffer[80]="";
116 char *file="/proc/sys/kernel/ostype";
117 f = open(file, O_RDONLY);
118 if (f == 0)
119 {
120 printf("error to open: %s\n", file);
121 exit(EXIT_FAILURE);
122 }
123 read(f, (void *)buffer, 80);
124 buffer[strlen(buffer)-1]=0;
125 printf("当前操作系统：\t%s\n", buffer);
126 close(f);
127 }
128
129 void sampleDiskStat(){
130 int i;
131 FILE *fp;
132 int nread=0;
133 ssize_t len = 0;
134 char *buffer=NULL;
135 char buf[20][32];
136 char *file="/proc/diskstats";
137 char *p;
138 fp = fopen(file, "rb");
139 if (fp == NULL)
140 {
141 printf("error to open: %s\n", file);
142 exit(EXIT_FAILURE);
143 }
144 printf(" 磁盘 读次数 写次数\n");
145 while((nread = getline(&buffer, &len, fp)) != -1) { /* 简单实现读行的功能 */
146 sscanf(buffer, "%04s%08s%s %s %s %s %s %s %s %s %s %s %s %s",
147 &buf[0],&buf[1],&buf[2],&buf[3],&buf[4],&buf[5],&buf[6],
148 &buf[7],&buf[8],&buf[9],&buf[10],&buf[11],&buf[12],&buf[13]);
149 if ((p=strstr(buf[2], "loop"))!=NULL)
150 {
151 ; /* loop本地回路不作操作 */
152 }
153 else {
154 printf("%06s%08s%08s\n",
155 &buf[2],&buf[3], &buf[7]);
156 }
157 }
158 }
159
160 void sampleProcesses(void)
161 {
162 FILE *fp;
163 int nread=0;
164 ssize_t len = 0;
165 char *buf=NULL;
166 char *buffer=NULL;
167 char *file="/proc/stat";
168 fp = fopen(file, "rb");
169 if (fp == NULL)
170 {
171 printf("error to open: %s\n", file);
172 exit(EXIT_FAILURE);
173 }
174 while((nread = getline(&buffer, &len, fp)) != -1) {
175 if((buf=strstr(buffer, "processes"))!=NULL) /* 简单实现grep的功能 */
176 break;
177 }
178 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
179 char count[16]="";
180 sscanf(buffer, "%s%s", count, count);
181 printf("执行线程数目:\t%s\n", count);
182 }
183
184 void sampleContext(void)
185 {
186 FILE *fp;
187 int nread=0;
188 ssize_t len = 0;
189 char *buf=NULL;
190 char *buffer=NULL;
191 char *file="/proc/stat";
192 fp = fopen(file, "rb");
193 if (fp == NULL)
194 {
195 printf("error to open: %s\n", file);
196 exit(EXIT_FAILURE);
197 }
198 while((nread = getline(&buffer, &len, fp)) != -1) {
199 if((buf=strstr(buffer, "ctxt"))!=NULL) /* 简单实现grep的功能 */
200 break;
201 }
202 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
203 char count[16]="";
204 sscanf(buffer, "%s%s", count, count);
205 printf("上下文切换次数:\t%s\n", count);
206 }
207
208 void sampleMeminfo()
209 {
210 FILE *fp;
211 int nread=0;
212 ssize_t len = 0;
213 char *buf=NULL;
214 char *buffer=NULL;
215 char *file="/proc/meminfo";
216 char content[16]="";
217 fp = fopen(file, "rb");
218 if (fp == NULL)
219 {
220 printf("error to open: %s\n", file);
221 exit(EXIT_FAILURE);
222 }
223 while((nread = getline(&buffer, &len, fp)) != -1) {
224 if((buf=strstr(buffer, "MemTotal"))!=NULL) /* 简单实现grep的功能 */
225 {
226 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
227 sscanf(buffer, "%s%s", content, content);
228 int memtotal_kb=(int)(strtof(content, NULL));
229 printf("内存总容量:\t%dG%4dM %4dK\n",
230 memtotal_kb/(1024*1024), /* Gb */
231 (memtotal_kb/(1024))%1024, /* Mb */
232 (memtotal_kb%(1024*1024))%1024); /* Kb */
233 }
234 if((buf=strstr(buffer, "MemFree"))!=NULL) /* 简单实现grep的功能 */
235 {
236 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
237 sscanf(buffer, "%s%s", content, content);
238 int memfree_kb=(int)(strtof(content, NULL));
239 printf("内存可用容量:\t%dG%4dM %4dK\n",
240 memfree_kb/(1024*1024), /* Gb */
241 (memfree_kb/(1024))%1024, /* Mb */
242 (memfree_kb%(1024*1024))%1024); /* Kb */
243 }
244 if((buf=strstr(buffer, "SwapTotal"))!=NULL) /* 简单实现grep的功能 */
245 {
246 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
247 sscanf(buffer, "%s%s", content, content);
248 int swaptotal_kb=(int)(strtof(content, NULL));
249 printf("SWAP总容量:\t%dG%4dM %4dK\n",
250 swaptotal_kb/(1024*1024), /* Gb */
251 (swaptotal_kb/(1024))%1024, /* Mb */
252 (swaptotal_kb%(1024*1024))%1024); /* Kb */
253 }
254 if((buf=strstr(buffer, "SwapFree"))!=NULL) /* 简单实现grep的功能 */
255 {
256 buffer[strlen(buffer)-1]=0; /* 简单实现tr()函数的功能 */
257 sscanf(buffer, "%s%s", content, content);
258 int swapfree_kb=(int)(strtof(content, NULL));
259 printf("SWAP可用容量:\t%dG%4dM %4dK\n",
260 swapfree_kb/(1024*1024), /* Gb */
261 (swapfree_kb/(1024))%1024, /* Mb */
262 (swapfree_kb%(1024*1024))%1024); /* Kb */
263 break; /* 所需的信息已满足，退出循环 */
264 }
265 }
266 }
267 /*
268 * === FUNCTION ======================================================================
269 * Name: main
270 * Description:
271 * =====================================================================================
272 */
273 int main ( int argc, char *argv[] )
274 {
275 printf(">>>系统负载<<<\n");
276 sampleLoadAvg();
277 printf("----------------------------------------\n");
278 printf("\n");
279 printf(">>>运行时间<<<\n");
280 sampleTime();
281 printf("\n");
282 printf(">>>版本信息<<<\n");
283 sampleOsType();
284 sampleOsRelease();
285 sampleKernelVersion();
286 printf("----------------------------------------\n");
287 printf("\n");
288 printf(">>>磁盘信息<<<\n");
289 sampleDiskStat();
290 printf("----------------------------------------\n");
291 printf("\n");
292 printf(">>>上下文切换<<<\n");
293 sampleContext();
294 printf("----------------------------------------\n");
295 printf("\n");
296 printf(">>>线程数目<<<\n");
297 sampleProcesses();
298 printf("----------------------------------------\n");
299 printf("\n");
300 printf(">>>内存信息<<<\n");
301 sampleMeminfo();
302 printf("----------------------------------------\n");
303 return EXIT_SUCCESS;
304 }
