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' ' */ 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 ", 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 ", buf[0]); 42 printf("五分钟平均负载：%s ", buf[1]); 43 printf("一刻钟平均负载：%s ", buf[2]); 44 printf("采样时刻的间隔：%s ", buf[3]); 45 printf("最大线程的数目：%s ", 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 ", 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： %s秒 ", buf[0]); 65 printf("系统空闲时间： %s秒 ", 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： %03d天%02d时%02d分%02.6f秒 ", 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： %03d天%02d时%02d分%02.6f秒 ", 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 ", 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： %s ", 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 ", 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： %s ", 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 ", 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： %s ", 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 ", file); 142 exit(EXIT_FAILURE); 143 } 144 printf(" 磁盘 读次数 写次数 "); 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 ", 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 ", 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: %s ", 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 ", 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: %s ", 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 ", 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: %dG%4dM %4dK ", 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: %dG%4dM %4dK ", 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: %dG%4dM %4dK ", 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: %dG%4dM %4dK ", 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<<< "); 276 sampleLoadAvg(); 277 printf("---------------------------------------- "); 278 printf(" "); 279 printf(">>>运行时间<<< "); 280 sampleTime(); 281 printf(" "); 282 printf(">>>版本信息<<< "); 283 sampleOsType(); 284 sampleOsRelease(); 285 sampleKernelVersion(); 286 printf("---------------------------------------- "); 287 printf(" "); 288 printf(">>>磁盘信息<<< "); 289 sampleDiskStat(); 290 printf("---------------------------------------- "); 291 printf(" "); 292 printf(">>>上下文切换<<< "); 293 sampleContext(); 294 printf("---------------------------------------- "); 295 printf(" "); 296 printf(">>>线程数目<<< "); 297 sampleProcesses(); 298 printf("---------------------------------------- "); 299 printf(" "); 300 printf(">>>内存信息<<< "); 301 sampleMeminfo(); 302 printf("---------------------------------------- "); 303 return EXIT_SUCCESS; 304 }