Does the write function work?

Write a small one onceCodeIt's not complicated, but the instructor cat file, nothing ah, wondering ~~~ Later I found that I had to open --- write -- close --- to write it to the physical disk.

While ()

{

Open;

Write;

Close ();

}

 

Not:

Open

While ()

{

Write ();

}

Close (); // The key is that sometimesProgramIt is in the while, or the while program is blocked by the parent process, and the child process depends on the content of the physical file written by the parent process... Then cupcup ~~~