Basic network socket programming just now

The latest basic network socket programming-general Linux technology-Linux programming and kernel information is shown below. Open the door to the basics of network programming for new users, hoping to help new users!
Encapsulate the source code of the read and write functions provided by the system: (the file is saved as iolib. h)
# Include
# Include
# Include
Ssize_t my_read (int fd, void * buf, size_t length)
{
Ssize_t done = length;
While (done> 0)
{
Done = read (fd, buf, length );
If (done! = Length)
If (errno = EINTR)
Done = length;
Else
{
Perror ("fail to read! \ N ");
Return-1;
}
Else
Break;
}
Return done;
}

Ssize_t my_write (int fd, void * buf, size_t length)
{
Ssize_t done = length;
While (done> 0)
{
Done = write (fd, buf, length );
If (done! = Length)
If (errno = EINTR)
Done = length;
Else
{
Perror ("fail to write! \ N ");
Return-1;
}
Else
Break;
}
Return done;
}