const golang.org/x/sys/unix.F_SETFD

2 uses

	golang.org/x/sys/unix (current package)
		syscall_unix.go#L537: func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
		zerrors_linux.go#L1334: 	F_SETFD                                     = 0x2