Function kern_fcntl

freebsd/kern/kern_descrip.c:471–858

}

int
kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
{
	struct filedesc *fdp;
	struct flock *flp;
	struct file *fp, *fp2;
	struct filedescent *fde;
	struct proc *p;
	struct vnode *vp;
	struct mount *mp;
	int error, flg, seals, tmp;
	uint64_t bsize;
	off_t foffset;

	error = 0;
	flg = F_POSIX;
	p = td->td_proc;
	fdp = p->p_fd;

	AUDIT_ARG_FD(cmd);
	AUDIT_ARG_CMD(cmd);
	switch (cmd) {
	case F_DUPFD:
		tmp = arg;
		error = kern_dup(td, FDDUP_FCNTL, 0, fd, tmp);
		break;

	case F_DUPFD_CLOEXEC:
		tmp = arg;
		error = kern_dup(td, FDDUP_FCNTL, FDDUP_FLAG_CLOEXEC, fd, tmp);
		break;

	case F_DUP2FD:
		tmp = arg;
		error = kern_dup(td, FDDUP_FIXED, 0, fd, tmp);
		break;

	case F_DUP2FD_CLOEXEC:
		tmp = arg;
		error = kern_dup(td, FDDUP_FIXED, FDDUP_FLAG_CLOEXEC, fd, tmp);
		break;

	case F_GETFD:
		error = EBADF;
		FILEDESC_SLOCK(fdp);
		fde = fdeget_locked(fdp, fd);
		if (fde != NULL) {
			td->td_retval[0] =
			    (fde->fde_flags & UF_EXCLOSE) ? FD_CLOEXEC : 0;
			error = 0;
		}
		FILEDESC_SUNLOCK(fdp);
		break;

	case F_SETFD:
		error = EBADF;
		FILEDESC_XLOCK(fdp);
		fde = fdeget_locked(fdp, fd);