socket programming in c

Today, a co-worker asked me a question about file uploads. The configuration environment is Nginx + PHP + fpm. A test interface, a formal interface, the test interface to request a formal interface, attempt to upload files. Problem characteristics: 1. The upload interface always times out (504). 2. But the final operation was successful (the file was successfully written) I looked at it and found a problem, and the timeout was shown on chrome for the entire 1-minute period. This has made m

between servers in a cluster. The server routine uses IP sockets to replicate the HTTP session state between cluster nodes. The correct soket configuration is critical to the performance of the cluster, and the efficiency of the socket based communication depends on the implementation category of the socket (for example, the system uses a local or a pure Java Socket Reader), if the server uses a pure Java The socket reader depends on whether the serv

;The result returned is: noWhat is this? To view logs:650) this.width=650; "style=" Float:none; "title=" 3.jpg "src=" http://s3.51cto.com/wyfs02/M02/47/86/ Wkiom1p8exrijvqeaag9gjwttsy648.jpg "alt=" Wkiom1p8exrijvqeaag9gjwttsy648.jpg "/>Look at the above error, it seems that mysql_connect this function is not found. Strange Why? After many tests, found that the original MySQL sock file location problem. When compiling above, using the--enable-sockets,php default is to find/var/lib/ MySQL under th

rotected] ~]# ls/home [[emailprotected] ~]# useradd user1 [[emailprotected] ~]# Ls/home User12.2 Under the System directory structure/media 临时挂载目录，默认空的/mnt 临时挂载目录，默认空的/opt 默认空的/proc 系统进程，不占用磁盘空间，运行在内存中，默认空的/run 进程产生的临时文件，关机后会消失/srv 存一些服务产生的文件/sys 系统内核一些相关文件/tmp 系统临时文件目录/usr 系统用户会用到的一些命令/var /var/log 系统日志常用目录/usr/bin /usr/sbin /bin /sbin /etc /var/ /usr/local2.3 ls Commandls lh -h人性化显示ls -i -i显示inode信息ls -la -a显示全部文件，.开头的文件是隐藏文件ls -lta -t以时间排序ls -ld /root

to the client, the client receives, and confirms the client-to-server connection.Third time: The client returns the confirmation code of the last request sent by the server, the server receives it, and confirms the server-to-client connection.We can see:1. Each connection to TCP needs to be confirmed.2. Client-to-server and server-to-client connections are independent.Let's think about the characteristics of the TCP protocol: connected, reliable, full-duplex, and actually TCP's three-time hands