Controls file system control operations.
Standard C Library (libc.a)
int fscntl ( vfs_id, Command, Argument, ArgumentSize)
The fscntl subroutine performs a variety of file system-specific functions. These functions typically require root user authority.
At present, only one file system, the Journaled File System, supports any commands via the fscntl subroutine.
Note: Application programs should not call this function, which is reserved for system management commands such as the chfs command.
|vfs_id||Identifies the file system to be acted upon. This information is returned by the stat subroutine in the st_vfs field of the stat.h file.|
|Command||Identifies the operation to be performed.|
|Argument||Specifies a pointer to a block of file system specific information that defines how the operation is to be performed.|
|ArgumentSize||Defines the size of the buffer pointed to by the Argument parameter.|
Upon successful completion, the fscntl subroutine returns a value of 0. Otherwise, a value of -1 is returned and the errno global variable is set to indicate the error.
The fscntl subroutine
fails if one or both of the following are true:
|EINVAL||The vfs_id parameter does not identify a valid file system.|
|EINVAL||The Command parameter is not recognized by the file system.|
This subroutine is part of Base Operating System (BOS) Runtime.
The chfs command.
The stat.h file.
Understanding File-System Helpers in AIX 5L Version 5.1 General Programming Concepts: Writing and Debugging Programs explains file system helpers and examines file system-helper execution syntax.