1.\" Copyright (c) 2009 Hudson River Trading LLC 2.\" Written by: John H. Baldwin <[email protected]> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd April 12, 2020 29.Dt CLOSEFROM 2 30.Os 31.Sh NAME 32.Nm closefrom , 33.Nm close_range 34.Nd delete open file descriptors 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In unistd.h 39.Ft void 40.Fn closefrom "int lowfd" 41.Ft int 42.Fn close_range "u_int lowfd" "u_int highfd" "int flags" 43.Sh DESCRIPTION 44The 45.Fn closefrom 46system call deletes all open file descriptors greater than or equal to 47.Fa lowfd 48from the per-process object reference table. 49Any errors encountered while closing file descriptors are ignored. 50.Pp 51The 52.Fn close_range 53system call deletes all open file descriptors between 54.Fa lowfd 55and 56.Fa highfd 57inclusive, clamped to the range of open file descriptors. 58Any errors encountered while closing file descriptors are ignored. 59There are currently no defined 60.Fa flags . 61.Sh RETURN VALUES 62Upon successful completion, 63.Fn close_range 64returns a value 65of 0. 66Otherwise, a value of -1 is returned and the global variable 67.Va errno 68is set to indicate the error. 69.Sh ERRORS 70The 71.Fn close_range 72system call 73will fail if: 74.Bl -tag -width Er 75.It Bq Er EINVAL 76The 77.Fa highfd 78argument is lower than the 79.Fa lowfd 80argument. 81.It Bq Er EINVAL 82An invalid flag was set. 83.El 84.Sh SEE ALSO 85.Xr close 2 86.Sh HISTORY 87The 88.Fn closefrom 89function first appeared in 90.Fx 8.0 . 91