freebsd-dev/share/man/man9/sbuf.9

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.\"-
.\" Copyright (c) 2000 Poul Henning Kamp and Dag-Erling Co<43>dan Sm<53>rgrav
.\" 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.
.\"
.\" $FreeBSD$
.\"
2004-07-09 11:44:49 +00:00
.Dd July 9, 2004
.Dt SBUF 9
.Os
.Sh NAME
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.Nm sbuf ,
.Nm sbuf_new ,
.Nm sbuf_clear ,
.Nm sbuf_setpos ,
.Nm sbuf_bcat ,
.Nm sbuf_bcopyin ,
.Nm sbuf_bcpy ,
.Nm sbuf_cat ,
.Nm sbuf_copyin ,
.Nm sbuf_cpy ,
.Nm sbuf_printf ,
.Nm sbuf_vprintf ,
.Nm sbuf_putc ,
.Nm sbuf_trim ,
.Nm sbuf_overflowed ,
.Nm sbuf_finish ,
.Nm sbuf_data ,
.Nm sbuf_len ,
.Nm sbuf_done ,
.Nm sbuf_delete
.Nd safe string formatting
.Sh SYNOPSIS
.In sys/types.h
.In sys/sbuf.h
2001-10-04 09:01:15 +00:00
.Ft struct sbuf *
.Fn sbuf_new "struct sbuf *s" "char *buf" "int length" "int flags"
.Ft void
.Fn sbuf_clear "struct sbuf *s"
.Ft int
.Fn sbuf_setpos "struct sbuf *s" "int pos"
.Ft int
.Fn sbuf_bcat "struct sbuf *s" "const void *buf" "size_t len"
.Ft int
.Fn sbuf_bcopyin "struct sbuf *s" "const void *uaddr" "size_t len"
.Ft int
.Fn sbuf_bcpy "struct sbuf *s" "const void *buf" "size_t len"
.Ft int
Rewrite of the CAM error recovery code. Some of the major changes include: - The SCSI error handling portion of cam_periph_error() has been broken out into a number of subfunctions to better modularize the code that handles the hierarchy of SCSI errors. As a result, the code is now much easier to read. - String handling and error printing has been significantly revamped. We now use sbufs to do string formatting instead of using printfs (for the kernel) and snprintf/strncat (for userland) as before. There is a new catchall error printing routine, cam_error_print() and its string-based counterpart, cam_error_string() that allow the kernel and userland applications to pass in a CCB and have errors printed out properly, whether or not they're SCSI errors. Among other things, this helped eliminate a fair amount of duplicate code in camcontrol. We now print out more information than before, including the CAM status and SCSI status and the error recovery action taken to remedy the problem. - sbufs are now available in userland, via libsbuf. This change was necessary since most of the error printing code is shared between libcam and the kernel. - A new transfer settings interface is included in this checkin. This code is #ifdef'ed out, and is primarily intended to aid discussion with HBA driver authors on the final form the interface should take. There is example code in the ahc(4) driver that implements the HBA driver side of the new interface. The new transfer settings code won't be enabled until we're ready to switch all HBA drivers over to the new interface. src/Makefile.inc1, lib/Makefile: Add libsbuf. It must be built before libcam, since libcam uses sbuf routines. libcam/Makefile: libcam now depends on libsbuf. libsbuf/Makefile: Add a makefile for libsbuf. This pulls in the sbuf sources from sys/kern. bsd.libnames.mk: Add LIBSBUF. camcontrol/Makefile: Add -lsbuf. Since camcontrol is statically linked, we can't depend on the dynamic linker to pull in libsbuf. camcontrol.c: Use cam_error_print() instead of checking for CAM_SCSI_STATUS_ERROR on every failed CCB. sbuf.9: Change the prototypes for sbuf_cat() and sbuf_cpy() so that the source string is now a const char *. This is more in line wth the standard system string functions, and helps eliminate warnings when dealing with a const source buffer. Fix a typo. cam.c: Add description strings for the various CAM error status values, as well as routines to look up those strings. Add new cam_error_string() and cam_error_print() routines for userland and the kernel. cam.h: Add a new CAM flag, CAM_RETRY_SELTO. Add enumerated types for the various options available with cam_error_print() and cam_error_string(). cam_ccb.h: Add new transfer negotiation structures/types. Change inq_len in the ccb_getdev structure to be "reserved". This field has never been filled in, and will be removed when we next bump the CAM version. cam_debug.h: Fix typo. cam_periph.c: Modularize cam_periph_error(). The SCSI error handling part of cam_periph_error() is now in camperiphscsistatuserror() and camperiphscsisenseerror(). In cam_periph_lock(), increase the reference count on the periph while we wait for our lock attempt to succeed so that the periph won't go away while we're sleeping. cam_xpt.c: Add new transfer negotiation code. (ifdefed out) Add a new function, xpt_path_string(). This is a string/sbuf analog to xpt_print_path(). scsi_all.c: Revamp string handing and error printing code. We now use sbufs for much of the string formatting code. More of that code is shared between userland the kernel. scsi_all.h: Get rid of SS_TURSTART, it wasn't terribly useful in the first place. Add a new error action, SS_REQSENSE. (Send a request sense and then retry the command.) This is useful when the controller hasn't performed autosense for some reason. Change the default actions around a bit. scsi_cd.c, scsi_da.c, scsi_pt.c, scsi_ses.c: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Selection timeouts shouldn't be covered by a sense flag. scsi_pass.[ch]: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Get rid of the last vestiges of a read/write interface. libkern/bsearch.c, sys/libkern.h, conf/files: Add bsearch.c, which is needed for some of the new table lookup routines. aic7xxx_freebsd.c: Define AHC_NEW_TRAN_SETTINGS if CAM_NEW_TRAN_CODE is defined. sbuf.h, subr_sbuf.c: Add the appropriate #ifdefs so sbufs can compile and run in userland. Change sbuf_printf() to use vsnprintf() instead of kvprintf(), which is only available in the kernel. Change the source string for sbuf_cpy() and sbuf_cat() to be a const char *. Add __BEGIN_DECLS and __END_DECLS around function prototypes since they're now exported to userland. kdump/mkioctls: Include stdio.h before cam.h since cam.h now includes a function with a FILE * argument. Submitted by: gibbs (mostly) Reviewed by: jdp, marcel (libsbuf makefile changes) Reviewed by: des (sbuf changes) Reviewed by: ken
2001-03-27 05:45:52 +00:00
.Fn sbuf_cat "struct sbuf *s" "const char *str"
.Ft int
.Fn sbuf_copyin "struct sbuf *s" "const void *uaddr" "size_t len"
.Ft int
Rewrite of the CAM error recovery code. Some of the major changes include: - The SCSI error handling portion of cam_periph_error() has been broken out into a number of subfunctions to better modularize the code that handles the hierarchy of SCSI errors. As a result, the code is now much easier to read. - String handling and error printing has been significantly revamped. We now use sbufs to do string formatting instead of using printfs (for the kernel) and snprintf/strncat (for userland) as before. There is a new catchall error printing routine, cam_error_print() and its string-based counterpart, cam_error_string() that allow the kernel and userland applications to pass in a CCB and have errors printed out properly, whether or not they're SCSI errors. Among other things, this helped eliminate a fair amount of duplicate code in camcontrol. We now print out more information than before, including the CAM status and SCSI status and the error recovery action taken to remedy the problem. - sbufs are now available in userland, via libsbuf. This change was necessary since most of the error printing code is shared between libcam and the kernel. - A new transfer settings interface is included in this checkin. This code is #ifdef'ed out, and is primarily intended to aid discussion with HBA driver authors on the final form the interface should take. There is example code in the ahc(4) driver that implements the HBA driver side of the new interface. The new transfer settings code won't be enabled until we're ready to switch all HBA drivers over to the new interface. src/Makefile.inc1, lib/Makefile: Add libsbuf. It must be built before libcam, since libcam uses sbuf routines. libcam/Makefile: libcam now depends on libsbuf. libsbuf/Makefile: Add a makefile for libsbuf. This pulls in the sbuf sources from sys/kern. bsd.libnames.mk: Add LIBSBUF. camcontrol/Makefile: Add -lsbuf. Since camcontrol is statically linked, we can't depend on the dynamic linker to pull in libsbuf. camcontrol.c: Use cam_error_print() instead of checking for CAM_SCSI_STATUS_ERROR on every failed CCB. sbuf.9: Change the prototypes for sbuf_cat() and sbuf_cpy() so that the source string is now a const char *. This is more in line wth the standard system string functions, and helps eliminate warnings when dealing with a const source buffer. Fix a typo. cam.c: Add description strings for the various CAM error status values, as well as routines to look up those strings. Add new cam_error_string() and cam_error_print() routines for userland and the kernel. cam.h: Add a new CAM flag, CAM_RETRY_SELTO. Add enumerated types for the various options available with cam_error_print() and cam_error_string(). cam_ccb.h: Add new transfer negotiation structures/types. Change inq_len in the ccb_getdev structure to be "reserved". This field has never been filled in, and will be removed when we next bump the CAM version. cam_debug.h: Fix typo. cam_periph.c: Modularize cam_periph_error(). The SCSI error handling part of cam_periph_error() is now in camperiphscsistatuserror() and camperiphscsisenseerror(). In cam_periph_lock(), increase the reference count on the periph while we wait for our lock attempt to succeed so that the periph won't go away while we're sleeping. cam_xpt.c: Add new transfer negotiation code. (ifdefed out) Add a new function, xpt_path_string(). This is a string/sbuf analog to xpt_print_path(). scsi_all.c: Revamp string handing and error printing code. We now use sbufs for much of the string formatting code. More of that code is shared between userland the kernel. scsi_all.h: Get rid of SS_TURSTART, it wasn't terribly useful in the first place. Add a new error action, SS_REQSENSE. (Send a request sense and then retry the command.) This is useful when the controller hasn't performed autosense for some reason. Change the default actions around a bit. scsi_cd.c, scsi_da.c, scsi_pt.c, scsi_ses.c: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Selection timeouts shouldn't be covered by a sense flag. scsi_pass.[ch]: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Get rid of the last vestiges of a read/write interface. libkern/bsearch.c, sys/libkern.h, conf/files: Add bsearch.c, which is needed for some of the new table lookup routines. aic7xxx_freebsd.c: Define AHC_NEW_TRAN_SETTINGS if CAM_NEW_TRAN_CODE is defined. sbuf.h, subr_sbuf.c: Add the appropriate #ifdefs so sbufs can compile and run in userland. Change sbuf_printf() to use vsnprintf() instead of kvprintf(), which is only available in the kernel. Change the source string for sbuf_cpy() and sbuf_cat() to be a const char *. Add __BEGIN_DECLS and __END_DECLS around function prototypes since they're now exported to userland. kdump/mkioctls: Include stdio.h before cam.h since cam.h now includes a function with a FILE * argument. Submitted by: gibbs (mostly) Reviewed by: jdp, marcel (libsbuf makefile changes) Reviewed by: des (sbuf changes) Reviewed by: ken
2001-03-27 05:45:52 +00:00
.Fn sbuf_cpy "struct sbuf *s" "const char *str"
.Ft int
.Fn sbuf_printf "struct sbuf *s" "const char *fmt" "..."
.Ft int
.Fn sbuf_vprintf "struct sbuf *s" "const char *fmt" "va_list ap"
.Ft int
.Fn sbuf_putc "struct sbuf *s" "int c"
.Ft int
.Fn sbuf_trim "struct sbuf *s"
.Ft int
.Fn sbuf_overflowed "struct sbuf *s"
.Ft void
.Fn sbuf_finish "struct sbuf *s"
.Ft char *
.Fn sbuf_data "struct sbuf *s"
.Ft int
.Fn sbuf_len "struct sbuf *s"
.Ft int
.Fn sbuf_done "struct sbuf *s"
.Ft void
.Fn sbuf_delete "struct sbuf *s"
.Sh DESCRIPTION
The
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.Nm
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family of functions allows one to safely allocate, construct and
release bounded null-terminated strings in kernel space.
Instead of arrays of characters, these functions operate on structures
called
.Fa sbufs ,
defined in
.In sys/sbuf.h .
.Pp
The
.Fn sbuf_new
function initializes the
.Fa sbuf
pointed to by its first argument.
If that pointer is
.Dv NULL ,
.Fn sbuf_new
allocates a
.Vt struct sbuf
using
.Xr malloc 9 .
The
.Fa buf
argument is a pointer to a buffer in which to store the actual string;
if it is
.Dv NULL ,
.Fn sbuf_new
will allocate one using
.Xr malloc 9 .
The
.Fa length
is the initial size of the storage buffer.
The fourth argument,
.Fa flags ,
may be comprised of the following flags:
.Bl -tag -width ".Dv SBUF_AUTOEXTEND"
.It Dv SBUF_FIXEDLEN
The storage buffer is fixed at its initial size.
Attempting to extend the sbuf beyond this size results in an overflow condition.
.It Dv SBUF_AUTOEXTEND
This indicates that the storage buffer may be extended as necessary, so long
as resources allow, to hold additional data.
.El
.Pp
Note that if
.Fa buf
is not
.Dv NULL ,
it must point to an array of at least
.Fa length
characters.
The result of accessing that array directly while it is in use by the
sbuf is undefined.
.Pp
The
.Fn sbuf_delete
function clears the
.Fa sbuf
and frees any memory allocated for it.
There must be a call to
.Fn sbuf_delete
for every call to
.Fn sbuf_new .
Any attempt to access the sbuf after it has been deleted will fail.
.Pp
The
.Fn sbuf_clear
function invalidates the contents of the
.Fa sbuf
and resets its position to zero.
.Pp
The
.Fn sbuf_setpos
function sets the
.Fa sbuf Ns 's
end position to
.Fa pos ,
which is a value between zero and one less than the size of the
storage buffer.
This effectively truncates the sbuf at the new position.
.Pp
The
.Fn sbuf_bcat
function appends the first
.Fa len
bytes from the buffer
.Fa buf
to the
.Fa sbuf .
.Pp
The
.Fn sbuf_bcopyin
function copies
.Fa len
bytes from the specified userland address into the
.Fa sbuf .
.Pp
The
.Fn sbuf_bcpy
function replaces the contents of the
.Fa sbuf
with the first
.Fa len
bytes from the buffer
.Fa buf .
.Pp
The
.Fn sbuf_cat
function appends the NUL-terminated string
.Fa str
to the
.Fa sbuf
at the current position.
.Pp
The
.Fn sbuf_copyin
function copies a NUL-terminated string from the specified userland
address into the
.Fa sbuf .
If the
.Fa len
argument is non-zero, no more than
.Fa len
characters (not counting the terminating NUL) are copied; otherwise
the entire string, or as much of it as can fit in the
.Fa sbuf ,
is copied.
.Pp
The
.Fn sbuf_cpy
function replaces the contents of the
.Fa sbuf
with those of the NUL-terminated string
.Fa str .
This is equivalent to calling
.Fn sbuf_cat
with a fresh
.Fa sbuf
or one which position has been reset to zero with
.Fn sbuf_clear
or
.Fn sbuf_setpos .
.Pp
The
.Fn sbuf_printf
function formats its arguments according to the format string pointed
to by
.Fa fmt
and appends the resulting string to the
.Fa sbuf
at the current position.
.Pp
The
.Fn sbuf_vprintf
function behaves the same as
.Fn sbuf_printf
except that the arguments are obtained from the variable-length argument list
.Fa ap .
.Pp
The
.Fn sbuf_putc
function appends the character
.Fa c
to the
.Fa sbuf
at the current position.
.Pp
The
.Fn sbuf_trim
function removes trailing whitespace from the
.Fa sbuf .
.Pp
The
.Fn sbuf_overflowed
function returns a non-zero value if the
.Fa sbuf
overflowed.
.Pp
The
.Fn sbuf_finish
function null-terminates the
.Fa sbuf
and marks it as finished, which means that it may no longer be
modified using
.Fn sbuf_setpos ,
.Fn sbuf_cat ,
Rewrite of the CAM error recovery code. Some of the major changes include: - The SCSI error handling portion of cam_periph_error() has been broken out into a number of subfunctions to better modularize the code that handles the hierarchy of SCSI errors. As a result, the code is now much easier to read. - String handling and error printing has been significantly revamped. We now use sbufs to do string formatting instead of using printfs (for the kernel) and snprintf/strncat (for userland) as before. There is a new catchall error printing routine, cam_error_print() and its string-based counterpart, cam_error_string() that allow the kernel and userland applications to pass in a CCB and have errors printed out properly, whether or not they're SCSI errors. Among other things, this helped eliminate a fair amount of duplicate code in camcontrol. We now print out more information than before, including the CAM status and SCSI status and the error recovery action taken to remedy the problem. - sbufs are now available in userland, via libsbuf. This change was necessary since most of the error printing code is shared between libcam and the kernel. - A new transfer settings interface is included in this checkin. This code is #ifdef'ed out, and is primarily intended to aid discussion with HBA driver authors on the final form the interface should take. There is example code in the ahc(4) driver that implements the HBA driver side of the new interface. The new transfer settings code won't be enabled until we're ready to switch all HBA drivers over to the new interface. src/Makefile.inc1, lib/Makefile: Add libsbuf. It must be built before libcam, since libcam uses sbuf routines. libcam/Makefile: libcam now depends on libsbuf. libsbuf/Makefile: Add a makefile for libsbuf. This pulls in the sbuf sources from sys/kern. bsd.libnames.mk: Add LIBSBUF. camcontrol/Makefile: Add -lsbuf. Since camcontrol is statically linked, we can't depend on the dynamic linker to pull in libsbuf. camcontrol.c: Use cam_error_print() instead of checking for CAM_SCSI_STATUS_ERROR on every failed CCB. sbuf.9: Change the prototypes for sbuf_cat() and sbuf_cpy() so that the source string is now a const char *. This is more in line wth the standard system string functions, and helps eliminate warnings when dealing with a const source buffer. Fix a typo. cam.c: Add description strings for the various CAM error status values, as well as routines to look up those strings. Add new cam_error_string() and cam_error_print() routines for userland and the kernel. cam.h: Add a new CAM flag, CAM_RETRY_SELTO. Add enumerated types for the various options available with cam_error_print() and cam_error_string(). cam_ccb.h: Add new transfer negotiation structures/types. Change inq_len in the ccb_getdev structure to be "reserved". This field has never been filled in, and will be removed when we next bump the CAM version. cam_debug.h: Fix typo. cam_periph.c: Modularize cam_periph_error(). The SCSI error handling part of cam_periph_error() is now in camperiphscsistatuserror() and camperiphscsisenseerror(). In cam_periph_lock(), increase the reference count on the periph while we wait for our lock attempt to succeed so that the periph won't go away while we're sleeping. cam_xpt.c: Add new transfer negotiation code. (ifdefed out) Add a new function, xpt_path_string(). This is a string/sbuf analog to xpt_print_path(). scsi_all.c: Revamp string handing and error printing code. We now use sbufs for much of the string formatting code. More of that code is shared between userland the kernel. scsi_all.h: Get rid of SS_TURSTART, it wasn't terribly useful in the first place. Add a new error action, SS_REQSENSE. (Send a request sense and then retry the command.) This is useful when the controller hasn't performed autosense for some reason. Change the default actions around a bit. scsi_cd.c, scsi_da.c, scsi_pt.c, scsi_ses.c: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Selection timeouts shouldn't be covered by a sense flag. scsi_pass.[ch]: SF_RETRY_SELTO -> CAM_RETRY_SELTO. Get rid of the last vestiges of a read/write interface. libkern/bsearch.c, sys/libkern.h, conf/files: Add bsearch.c, which is needed for some of the new table lookup routines. aic7xxx_freebsd.c: Define AHC_NEW_TRAN_SETTINGS if CAM_NEW_TRAN_CODE is defined. sbuf.h, subr_sbuf.c: Add the appropriate #ifdefs so sbufs can compile and run in userland. Change sbuf_printf() to use vsnprintf() instead of kvprintf(), which is only available in the kernel. Change the source string for sbuf_cpy() and sbuf_cat() to be a const char *. Add __BEGIN_DECLS and __END_DECLS around function prototypes since they're now exported to userland. kdump/mkioctls: Include stdio.h before cam.h since cam.h now includes a function with a FILE * argument. Submitted by: gibbs (mostly) Reviewed by: jdp, marcel (libsbuf makefile changes) Reviewed by: des (sbuf changes) Reviewed by: ken
2001-03-27 05:45:52 +00:00
.Fn sbuf_cpy ,
.Fn sbuf_printf
or
.Fn sbuf_putc .
.Pp
The
.Fn sbuf_data
and
.Fn sbuf_len
functions return the actual string and its length, respectively;
.Fn sbuf_data
only works on a finished
.Fa sbuf .
.Fn sbuf_done
returns non-zero if the sbuf is finished.
.Sh NOTES
If an operation caused an
.Fa sbuf
to overflow, most subsequent operations on it will fail until the
.Fa sbuf
is finished using
.Fn sbuf_finish
or reset using
.Fn sbuf_clear ,
or its position is reset to a value between 0 and one less than the
size of its storage buffer using
.Fn sbuf_setpos ,
or it is reinitialized to a sufficiently short string using
.Fn sbuf_cpy .
.Sh RETURN VALUES
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The
.Fn sbuf_new
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function returns
.Dv NULL
if it failed to allocate a storage buffer, and a pointer to the new
.Fa sbuf
otherwise.
.Pp
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The
.Fn sbuf_setpos
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function returns \-1 if
.Fa pos
was invalid, and zero otherwise.
.Pp
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The
.Fn sbuf_cat ,
.Fn sbuf_cpy ,
.Fn sbuf_printf ,
.Fn sbuf_putc ,
and
.Fn sbuf_trim
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functions
all return \-1 if the buffer overflowed, and zero otherwise.
.Pp
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The
.Fn sbuf_overflowed
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function
returns a non-zero value if the buffer overflowed, and zero otherwise.
.Pp
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The
.Fn sbuf_data
and
.Fn sbuf_len
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functions return
.Dv NULL
and \-1, respectively, if the buffer overflowed.
.Pp
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The
.Fn sbuf_copyin
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function
returns \-1 if copying string from userland failed, and number of bytes
copied otherwise.
.Sh SEE ALSO
.Xr printf 3 ,
.Xr strcat 3 ,
.Xr strcpy 3 ,
.Xr copyin 9 ,
.Xr copyinstr 9 ,
.Xr printf 9
.Sh HISTORY
The
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.Nm
family of functions first appeared in
2001-07-19 09:07:51 +00:00
.Fx 4.4 .
.Sh AUTHORS
.An -nosplit
The
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.Nm
family of functions was designed by
.An Poul-Henning Kamp Aq phk@FreeBSD.org
and implemented by
.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
Additional improvements were suggested by
.An Justin T. Gibbs Aq gibbs@FreeBSD.org .
Auto-extend support added by
.An Kelly Yancey Aq kbyanc@FreeBSD.org .
.Pp
This manual page was written by
.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .