fcntl(5)                       DG/UX R4.11MU05                      fcntl(5)


NAME
       fcntl - file control options

SYNOPSIS
       #include <fcntl.h>

DESCRIPTION
       The fcntl(1) function helps you control open files.  This include
       file describes commands and arguments to fcntl and open(2).

       Flag values accessible to open(2) and fcntl(2)
       (The first three can only be set by open)

       ORDONLY     Read only
       OWRONLY     Write only
       ORDWR       Read/write
       ONDELAY     Non-blocking I/O
       OAPPEND     Append (writes guaranteed at the end)
       ONOCTTY     Do not assign controlling tty
       OSYNC       Synchronous writes
       OACCMODE    Mask for file access modes

       Flag values accessible only to open(2)

       OCREAT    Open with file create (uses 3rd open arg)
       OTRUNC    Open with truncation
       OEXCL     Exclusive open
       fcntl(2) commands

       FDUPFD        Duplicate file descriptors
       FDCLOEXEC     Close the file descriptor upon execution of
                      an exec function [see exec(2)]
       FGETFD        Get the `close-on-exec' flag
       FSETFD        Set the `close-on-exec' flag
       FGETFL        Get file flags
       FSETFL        Set file flags
       FGETLK        Get record lock status
       FSETLK        Set record lock or fail
       FSETLKW       Set record lock or pend
       FRDLCK        Shared or read lock
       FUNLCK        Unlock
       FWRLCK        Exclusive or write lock
       FCHKFL        Check flags for validity
       FFREESP       Free up file space
       FGETOWN       Get owner of file descriptor
       FSETOWN       Set owner of file descriptor

SEE ALSO
       fcntl(2), open(2), creat(2).


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