1.\" Copyright (c) 2009 Hudson River Trading LLC 2.\" Written by: John H. Baldwin <jhb@FreeBSD.org> 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.Dd May 17, 2025 27.Dt CLOSEFROM 2 28.Os 29.Sh NAME 30.Nm closefrom , 31.Nm close_range 32.Nd delete open file descriptors 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In unistd.h 37.Ft void 38.Fn closefrom "int lowfd" 39.Ft int 40.Fn close_range "u_int lowfd" "u_int highfd" "int flags" 41.Sh DESCRIPTION 42The 43.Fn closefrom 44system call deletes all open file descriptors greater than or equal to 45.Fa lowfd 46from the per-process object reference table. 47Any errors encountered while closing file descriptors are ignored. 48.Pp 49The 50.Fn close_range 51system call deletes all open file descriptors between 52.Fa lowfd 53and 54.Fa highfd 55inclusive, clamped to the range of open file descriptors. 56Any errors encountered while closing file descriptors are ignored. 57Supported 58.Fa flags : 59.Bl -tag -width ".Dv CLOSE_RANGE_CLOEXEC" 60.It Dv CLOSE_RANGE_CLOEXEC 61Set the close-on-exec flag on descriptors in the range instead of closing them. 62.It Dv CLOSE_RANGE_CLOFORK 63Set the close-on-fork 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.Pp 96The 97.Dv CLOSE_RANGE_CLOFORK 98flag appeared in 99.Fx 15.0 . 100