The recv or read function () in tcp reads network data.

The recv or read function () in tcp reads network data-Linux general technology-Linux programming and kernel information. The following is a detailed description. : 0 wszxc
This afternoon, the data was transmitted over the recv or read network. However, after the transmission was completed, the programs on both the server and the host stopped, or they were reading data all the time, but nothing is read.
So my program is stuck there.

The procedure is as follows:
Server:

// Download file functions
Int download_file (char * buf, int c_sockfd)
{
Int fd; char buff [100]; int k;
Fd = open (buf + 3, O_RDWR );
While (k = read (fd, buff, 100)> 0)
{

Write (c_sockfd, buff, 100 );
Memset (buff, 0,100 );
Printf ("the sent data is % d bits. \ N ", k );
}
Printf ("Data Transmission completed ");
Close (fd );
Return 0;
}


Client Program:
/Download file functions
Int download_file (int c_sockfd)
{
Int fd;
Char buff [100];
Int k;
Fd = open ("/home/wangli/wujun/tt.txt", O_RDWR | O_CREAT );
While (k = read (c_sockfd, buff, 100)> 0) // test whether read is performed once or cyclically.
{

Write (fd, buff, 100 );
Memset (buff, 0,100 );
Printf ("the received data is % d bits. \ N ", k );

}
Printf ("data accepted ");
Close (fd );
Return 0;
}


Please:
Bright swords from Jianghu!