FIONCLEX

Clear “close on exec” on a file descriptor

Synopsis:

#include <sys/ioctl.h>

#define FIONCLEX        _IO('f', 2)

Arguments to ioctl():

Argument	Value
`fd`	A file descriptor that you obtained by opening the device
`request`	FIONCLEX

Description:

This command clears the “close on exec” flag on a file descriptor. It's implemented as a call to fcntl() with a command of F_SETFD and an additional argument of ~FD_CLOEXEC.

Input:

None.

Output: