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    1. [linux]getopt_long

      linux下的命令行参数函数的使用

      struct option 成员的解析

      //{选项名,是否需要参数,如果是NULL,则getopt_long返回val(通常设定为short option)
          //如果非NULL,则getopt_long返回0,flag 指向val 
          //{"get",no_argument,&method,METHOD_GET}, ==》 匹配到get选项时,getopt_long返回0,method=METHOD_GET
          //}

      getopt_long 参数的解析

      //912Vfr ?h==> -9 -1 -2 -V -f -r
          //t: p: c:==>-t 100  选项后面要带一个参数
          //如果是字母后面带两个冒号表示选项后面的参数可有可无
      #include <stdio.h>
      #include <stdlib.h>
      #include <unistd.h>
      #include <getopt.h>
      static void usage(void)
      {
          fprintf(stderr,
                  "webbench [option]... URL\n"
                  "  -f|--force               Don't wait for reply from server.\n"
                  "  -r|--reload              Send reload request - Pragma: no-cache.\n"
                  "  -t|--time <sec>          Run benchmark for <sec> seconds. Default 30.\n"
                  "  -p|--proxy <server:port> Use proxy server for request.\n"
                  "  -c|--clients <n>         Run <n> HTTP clients at once. Default one.\n"
                  "  -9|--http09              Use HTTP/0.9 style requests.\n"
                  "  -1|--http10              Use HTTP/1.0 protocol.\n"
                  "  -2|--http11              Use HTTP/1.1 protocol.\n"
                  "  --get                    Use GET request method.\n"
                  "  --head                   Use HEAD request method.\n"
                  "  --options                Use OPTIONS request method.\n"
                  "  --trace                  Use TRACE request method.\n"
                  "  -?|-h|--help             This information.\n"
                  "  -V|--version             Display program version.\n"
                 );
      }
      /* values */
      volatile int timerexpired=0;
      int speed=0;
      int failed=0;
      int bytes=0;
      
      /* globals */
      int http10=1; /* 0 - http/0.9, 1 - http/1.0, 2 - http/1.1 */
      /* Allow: GET, HEAD, OPTIONS, TRACE */
      #define METHOD_GET 0
      #define METHOD_HEAD 1
      #define METHOD_OPTIONS 2
      #define METHOD_TRACE 3
      #define PROGRAM_VERSION "1.5"
      int method=METHOD_GET;
      int clients=1;
      int force=0;
      int force_reload=0;
      int proxyport=80;
      char *proxyhost=NULL;
      int benchtime=30;
      static const struct option long_options[]=
      {
          {"force",no_argument,&force,1},
          {"reload",no_argument,&force_reload,1},
          {"time",required_argument,NULL,'t'},
          {"help",no_argument,NULL,'?'},
          {"http09",no_argument,NULL,'9'},
          {"http10",no_argument,NULL,'1'},
          {"http11",no_argument,NULL,'2'},
          {"get",no_argument,&method,METHOD_GET},
          {"head",no_argument,&method,METHOD_HEAD},
          {"options",no_argument,&method,METHOD_OPTIONS},
          {"trace",no_argument,&method,METHOD_TRACE},
          {"version",no_argument,NULL,'V'},
          {"proxy",required_argument,NULL,'p'},
          {"clients",required_argument,NULL,'c'},
          {NULL,0,NULL,0}
      };
      int main(int argc,char *argv[])
      {
      
      
          if(argc==1)//没有带参数
          {
              usage();
              return 2;
          } 
          int opt;
          int options_index=0;
         
          while((opt=getopt_long(argc,argv,"912Vfrt:p:c:?h",long_options,&options_index))!=EOF )
          {
              switch(opt)
              {
                  case  0 : break;
                  case 'f': printf("f\n");break;
                  case 'r': printf("r\n");break; 
                  case '9': printf("9\n");break;
                  case '1': printf("1\n");break;
                  case '2': printf("2\n");break;
                  case 'V': printf("V\n");exit(0);
                  case 't': printf("t\n");break;       
                  case 'p': 
                  printf("p\n");break;
                  case ':':
                  case 'h':
                  case '?': usage();return 2;break;
                  case 'c': printf("c\n");break;
              }
          }
      
      
          return 0;
      }

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