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 March 3, 2022 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. 59Supported 60.Fa flags : 61.Bl -tag -width ".Dv CLOSE_RANGE_CLOEXEC" 62.It Dv CLOSE_RANGE_CLOEXEC 63Set the close-on-exec flag on descriptors in the range instead of closing them. 64.El 65.Sh RETURN VALUES 66Upon successful completion, 67.Fn close_range 68returns a value 69of 0. 70Otherwise, a value of -1 is returned and the global variable 71.Va errno 72is set to indicate the error. 73.Sh ERRORS 74The 75.Fn close_range 76system call 77will fail if: 78.Bl -tag -width Er 79.It Bq Er EINVAL 80The 81.Fa highfd 82argument is lower than the 83.Fa lowfd 84argument. 85.It Bq Er EINVAL 86An invalid flag was set. 87.El 88.Sh SEE ALSO 89.Xr close 2 90.Sh HISTORY 91The 92.Fn closefrom 93function first appeared in 94.Fx 8.0 . 95