fclose - Maple Help

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fclose

closes a buffered file

close

closes an unbuffered file

 

Calling Sequence

Parameters

Description

Thread Safety

Examples

Calling Sequence

fclose(file ...)

close(file ...)

Parameters

file

-

one or more names or file descriptors of open files to be closed

Description

• 

The functions close and fclose are equivalent, and can be used interchangeably.

• 

Closes the specified file, which is assumed to have been opened either implicitly or by fopen or open.

• 

fclose and close do not return anything.

• 

Closing a file ensures that all data is actually written to disk.

• 

When exiting Maple by the quit, done, or stop command, all open files are automatically closed.

• 

Closing a file which exists but is not open is harmless.

• 

The number of open files allowed is system specific.

• 

When writing many files, you must fclose() each of them to ensure that you do not run out of file handles.

Thread Safety

• 

The fclose and close commands are thread safe as of Maple 15.  Care must be taken when closing files that are used by multiple threads in parallel.

• 

Parallel calls to file i/o commands on the same file descriptor will be serialized in an arbitrary order.  If you need the commands to execute in a particular order you must use Maple's synchronization tools to enforce this.  See Threads:-Mutex.

• 

For more information on thread safety, see index/threadsafe.

Examples

fdfopentestFile,WRITE,BINARY

fd:=0

(1)

fprintffd,`This is a test `

15

(2)

fclosefd

See Also

file_types

fopen

IO_errors

open

 


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