Fcntl

   

Declaration:

Procedure Fcntl (Fd : text, Cmd : Integer; Arg : longint) ;

Description:

Read or Set a file's attributes. Fd is an assigned file. Cmd speciefies what to do, and is one of the following:

F_SetFd

Set the close_on_exec flag of Fd. (only the least siginificant bit is used).

F_GetLk

Return the flock record that prevents this process from obtaining the lock, or set the l_type field of the lock of there is no obstruction. Arg is a pointer to a flock record.

F_SetLk

Set the lock or clear it (depending on l_type in the flock structure). if the lock is held by another process, an error occurs.

F_GetLkw

Same as for F_Setlk, but wait until the lock is released.

F_SetOwn

Set the Process or process group that owns a socket.

Errors:

LinuxError is used to report errors.

sys_ebadf

Fd has a bad file descriptor.

sys_eagain or sys_eaccess

For F_SetLk, if the lock is held by another process.

See also:

Fcntl, Fcntl (2)