mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-22 11:14:18 +01:00
8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
93 lines
2.7 KiB
Groff
93 lines
2.7 KiB
Groff
.\" Copyright (c) 2009 Hudson River Trading LLC
|
|
.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd March 3, 2022
|
|
.Dt CLOSEFROM 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm closefrom ,
|
|
.Nm close_range
|
|
.Nd delete open file descriptors
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft void
|
|
.Fn closefrom "int lowfd"
|
|
.Ft int
|
|
.Fn close_range "u_int lowfd" "u_int highfd" "int flags"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn closefrom
|
|
system call deletes all open file descriptors greater than or equal to
|
|
.Fa lowfd
|
|
from the per-process object reference table.
|
|
Any errors encountered while closing file descriptors are ignored.
|
|
.Pp
|
|
The
|
|
.Fn close_range
|
|
system call deletes all open file descriptors between
|
|
.Fa lowfd
|
|
and
|
|
.Fa highfd
|
|
inclusive, clamped to the range of open file descriptors.
|
|
Any errors encountered while closing file descriptors are ignored.
|
|
Supported
|
|
.Fa flags :
|
|
.Bl -tag -width ".Dv CLOSE_RANGE_CLOEXEC"
|
|
.It Dv CLOSE_RANGE_CLOEXEC
|
|
Set the close-on-exec flag on descriptors in the range instead of closing them.
|
|
.El
|
|
.Sh RETURN VALUES
|
|
Upon successful completion,
|
|
.Fn close_range
|
|
returns a value
|
|
of 0.
|
|
Otherwise, a value of -1 is returned and the global variable
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn close_range
|
|
system call
|
|
will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa highfd
|
|
argument is lower than the
|
|
.Fa lowfd
|
|
argument.
|
|
.It Bq Er EINVAL
|
|
An invalid flag was set.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr close 2
|
|
.Sh HISTORY
|
|
The
|
|
.Fn closefrom
|
|
function first appeared in
|
|
.Fx 8.0 .
|