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