Fcntl

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F_DUPFD

Duplicate a file descriptor to the minimum unused file descriptor greater than or equal to the argument.

The close-on-exec flag of the duplicated file descriptor is set. (Ruby uses F_DUPFD_CLOEXEC internally if available to avoid race condition. F_SETFD is used if F_DUPFD_CLOEXEC is not available.)

F_GETFD

Read the close-on-exec flag of a file descriptor.

F_GETLK

Determine whether a given region of a file is locked. This uses one of the F_*LK flags.

F_SETFD

Set the close-on-exec flag of a file descriptor.

F_GETFL

Get the file descriptor flags. This will be one or more of the O_* flags.

F_SETFL

Set the file descriptor flags. This will be one or more of the O_* flags.

F_SETLK

Acquire a lock on a region of a file. This uses one of the F_*LCK flags.

F_SETLKW

Acquire a lock on a region of a file, waiting if necessary. This uses one of the F_*LCK flags

FD_CLOEXEC

the value of the close-on-exec flag.

F_RDLCK

Read lock for a region of a file

F_UNLCK

Remove lock for a region of a file

F_WRLCK

Write lock for a region of a file

F_SETPIPE_SZ

Change the capacity of the pipe referred to by fd to be at least arg bytes.

F_GETPIPE_SZ

Return (as the function result) the capacity of the pipe referred to by fd.

O_CREAT

Create the file if it doesn’t exist

O_EXCL

Used with O_CREAT, fail if the file exists

O_NOCTTY

Open TTY without it becoming the controlling TTY

O_TRUNC

Truncate the file on open

O_APPEND

Open the file in append mode

O_NONBLOCK

Open the file in non-blocking mode

O_NDELAY

Open the file in non-blocking mode

O_RDONLY

Open the file in read-only mode

O_RDWR

Open the file in read-write mode

O_WRONLY

Open the file in write-only mode.

O_ACCMODE

Mask to extract the read/write flags

F_DUP2FD

It is a FreeBSD specific constant and equivalent to dup2 call.

F_DUP2FD_CLOEXEC

It is a FreeBSD specific constant and acts similarly as F_DUP2FD but set the FD_CLOEXEC flag in addition.