压力测试

一个通用的压力测试程序，
我也不知道是否通用，书上说是，抄下来学习学习

#include <stdlib.h>#include <stdio.h>#include <assert.h>#include <unistd.h>#include <sys/types.h>#include <sys/epoll.h>#include <fcntl.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>#include <strings.h>#include <stdbool.h>//每个客户连续不断地向服务器发送这个请求static const char* request = "GET http://localhost/index.html HTTP/1.1\r\nConnection: keep-alive\r\n\r\nxxxxxxxxxxxx";int setnonblocking( int fd ){    int old_option = fcntl( fd, F_GETFL );    int new_option = old_option | O_NONBLOCK;    fcntl( fd, F_SETFL, new_option );    return old_option;}void addfd( int epoll_fd, int fd ){    struct epoll_event event;    event.data.fd = fd;    event.events = EPOLLOUT | EPOLLET | EPOLLERR;    epoll_ctl( epoll_fd, EPOLL_CTL_ADD, fd, &event );    setnonblocking( fd );}//向服务器写入len字节的数据bool write_nbytes( int sockfd, const char* buffer, int len ){    int bytes_write = 0;    printf( "write out %d bytes to socket %d\n", len, sockfd );    while( 1 )     {           bytes_write = send( sockfd, buffer, len, 0 );        if ( bytes_write == -1 )        {               return false;        }           else if ( bytes_write == 0 )         {               return false;        }           len -= bytes_write;        buffer = buffer + bytes_write;        if ( len <= 0 )         {               return true;        }       }   }//从服务器读取数据bool read_once( int sockfd, char* buffer, int len ){    int bytes_read = 0;    memset( buffer, '\0', len );    bytes_read = recv( sockfd, buffer, len, 0 );    if ( bytes_read == -1 )    {        return false;    }    else if ( bytes_read == 0 )    {        return false;    }    printf( "read in %d bytes from socket %d with content: %s\n", bytes_read, sockfd, buffer );    return true;}//向服务器发起num个tcp连接，我们可以改变num来调整测试压力。void start_conn( int epoll_fd, int num, const char* ip, int port ){    int ret = 0;    struct sockaddr_in address;    bzero( &address, sizeof( address ) );    address.sin_family = AF_INET;    inet_pton( AF_INET, ip, &address.sin_addr );    address.sin_port = htons( port );    for ( int i = 0; i < num; ++i )    {        sleep( 1 );        int sockfd = socket( PF_INET, SOCK_STREAM, 0 );        printf( "create 1 sock\n" );        if( sockfd < 0 )        {            continue;        }        if (  connect( sockfd, ( struct sockaddr* )&address, sizeof( address ) ) == 0  )        {            printf( "build connection %d\n", i );            addfd( epoll_fd, sockfd );        }    }}void close_conn( int epoll_fd, int sockfd ){    epoll_ctl( epoll_fd, EPOLL_CTL_DEL, sockfd, 0 );    close( sockfd );}int main( int argc, char* argv[] ){    assert( argc == 4 );    int epoll_fd = epoll_create( 100 );    start_conn( epoll_fd, atoi( argv[ 3 ] ), argv[1], atoi( argv[2] ) );    struct epoll_event events[ 10000 ];    char buffer[ 2048 ];    while ( 1 )    {        int fds = epoll_wait( epoll_fd, events, 10000, 2000 );        for ( int i = 0; i < fds; i++ )        {               int sockfd = events[i].data.fd;            if ( events[i].events & EPOLLIN )            {                   if ( ! read_once( sockfd, buffer, 2048 ) )                {                    close_conn( epoll_fd, sockfd );                }                struct epoll_event event;                event.events = EPOLLOUT | EPOLLET | EPOLLERR;                event.data.fd = sockfd;                epoll_ctl( epoll_fd, EPOLL_CTL_MOD, sockfd, &event );            }            else if( events[i].events & EPOLLOUT )             {                if ( ! write_nbytes( sockfd, request, strlen( request ) ) )                {                    close_conn( epoll_fd, sockfd );                }                struct epoll_event event;                event.events = EPOLLIN | EPOLLET | EPOLLERR;                event.data.fd = sockfd;                epoll_ctl( epoll_fd, EPOLL_CTL_MOD, sockfd, &event );            }            else if( events[i].events & EPOLLERR )            {                close_conn( epoll_fd, sockfd );            }        }    }}

学习学习哈
等改天我用libevent写个试试看。