mandoc/mdoc.7 - diff

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Diff for /mandoc/mdoc.7 between version 1.222 and 1.247

version 1.222, 2013/11/02 20:39:49

version 1.247, 2014/12/31 20:42:31

Line 1

.\" $Id$

.\"

.\" Permission to use, copy, modify, and distribute this software for any

.\" purpose with or without fee is hereby granted, provided that the above

Line 125 file for a utility

\&.Nm progname

\&.Nd one line about what it does

\&.\e\(dq .Sh LIBRARY

\&.\e\(dq For sections 2, 3, & 9 only.

\&.\e\(dq For sections 2, 3, and 9 only.

\&.\e\(dq Not used in OpenBSD.

\&.Sh SYNOPSIS

\&.Nm progname

Line 135 file for a utility

The

\&.Nm

utility processes files ...

\&.\e\(dq .Sh CONTEXT

\&.\e\(dq For section 9 functions only.

\&.\e\(dq .Sh IMPLEMENTATION NOTES

\&.\e\(dq Not used in OpenBSD.

\&.\e\(dq .Sh RETURN VALUES

\&.\e\(dq For sections 2, 3, & 9 only.

\&.\e\(dq For sections 2, 3, and 9 function return values only.

\&.\e\(dq .Sh ENVIRONMENT

\&.\e\(dq For sections 1, 6, 7, & 8 only.

\&.\e\(dq For sections 1, 6, 7, and 8 only.

\&.\e\(dq .Sh FILES

\&.\e\(dq .Sh EXIT STATUS

\&.\e\(dq For sections 1, 6, & 8 only.

\&.\e\(dq For sections 1, 6, and 8 only.

\&.\e\(dq .Sh EXAMPLES

\&.\e\(dq .Sh DIAGNOSTICS

\&.\e\(dq For sections 1, 4, 6, 7, & 8 only.

\&.\e\(dq For sections 1, 4, 6, 7, 8, and 9 printf/stderr messages only.

\&.\e\(dq .Sh ERRORS

\&.\e\(dq For sections 2, 3, & 9 only.

\&.\e\(dq For sections 2, 3, 4, and 9 errno settings only.

\&.\e\(dq .Sh SEE ALSO

\&.\e\(dq .Xr foobar 1

\&.\e\(dq .Sh STANDARDS

Line 318 macro followed by a non-standard section name, and eac

Line 320 macro followed by a non-standard section name, and eac

several subsections, like in the present

.Nm

manual.

.It Em CONTEXT

This section lists the contexts in which functions can be called in section 9.

The contexts are autoconf, process, or interrupt.

.It Em IMPLEMENTATION NOTES

Implementation-specific notes should be kept here.

This is useful when implementing standard functions that may have side

Line 358 Example usages.

Line 363 Example usages.

This often contains snippets of well-formed, well-tested invocations.

Make sure that examples work properly!

.It Em DIAGNOSTICS

Documents error conditions.

Documents error messages.

This is most useful in section 4 manuals.

In section 4 and 9 manuals, these are usually messages printed by the

kernel to the console and to the kernel log.

In section 1, 6, 7, and 8, these are usually messages printed by

userland programs to the standard error output.

.Pp

Historically, this section was used in place of

.Em EXIT STATUS

for manuals in sections 1, 6, and 8; however, this practise is

Line 369 See

Line 378 See

.Sx \&Bl

.Fl diag .

.It Em ERRORS

Documents error handling in sections 2, 3, and 9.

Documents

.Xr errno 2

settings in sections 2, 3, 4, and 9.

.Pp

See

.Sx \&Er .

Line 377 See

Line 388 See

References other manuals with related topics.

This section should exist for most manuals.

Cross-references should conventionally be ordered first by section, then

alphabetically.

alphabetically (ignoring case).

.Pp

References to other documentation concerning the topic of the manual page,

for example authoritative books or journal articles, may also be

Line 422 in the alphabetical

Line 433 in the alphabetical

.Ss Document preamble and NAME section macros

.Bl -column "Brq, Bro, Brc" description

.It Sx \&Dd Ta document date: Cm $\&Mdocdate$ | Ar month day , year

.It Sx \&Dt Ta document title: Ar TITLE section Op Ar volume | arch

.It Sx \&Dt Ta document title: Ar TITLE section Op Ar arch

.It Sx \&Os Ta operating system version: Op Ar system Op Ar version

.It Sx \&Nm Ta document name (one argument)

.It Sx \&Nd Ta document description (one line)

Line 457 in the alphabetical

Line 468 in the alphabetical

.It Sx \&Pf Ta prefix, no following horizontal space (one argument)

.It Sx \&Ns Ta roman font, no preceding horizontal space (no arguments)

.It Sx \&Ap Ta apostrophe without surrounding whitespace (no arguments)

.It Sx \&Sm Ta switch horizontal spacing mode: Cm on | off

.It Sx \&Sm Ta switch horizontal spacing mode: Op Cm on | off

.It Sx \&Bk , \&Ek Ta keep block: Fl words

.It Sx \&br Ta force output line break in text mode (no arguments)

.It Sx \&sp Ta force vertical space: Op Ar height

Line 502 in the alphabetical

Line 513 in the alphabetical

.It Sx \&Cd Ta kernel configuration declaration (>0 arguments)

.It Sx \&Ad Ta memory address (>0 arguments)

.It Sx \&Ms Ta mathematical symbol (>0 arguments)

.It Sx \&Tn Ta tradename (>0 arguments)

.El

.Ss Physical markup

.Bl -column "Brq, Bro, Brc" description

Line 530 in the alphabetical

Line 540 in the alphabetical

.It Sx \&Ex Fl std Ta standard command exit values: Op Ar utility ...

.It Sx \&Rv Fl std Ta standard function return values: Op Ar function ...

.It Sx \&St Ta reference to a standards document (one argument)

.It Sx \&Ux Ta Ux

.It Sx \&At Ta At

.It Sx \&Bx Ta Bx

.It Sx \&Bsx Ta Bsx

Line 741 See also

Line 750 See also

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Nx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Bc

Close a

.Sx \&Bo

Line 929 The

Line 937 The

.Fl width

and

.Fl offset

arguments accept scaling widths as described in

arguments accept macro names as described for

.Xr roff 7

.Sx \&Bd

.Fl offset ,

scaling widths as described in

.Xr roff 7 ,

or use the length of the given string.

The

.Fl offset

Line 1107 See also

Line 1118 See also

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Nx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Bt

Supported only for compatibility, do not use this in new manuals.

Prints

.Dq is currently in beta test.

.Ss \&Bx

Line 1130 See also

Line 1141 See also

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Nx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Cd

Kernel configuration declaration.

This denotes strings accepted by

Line 1175 See also

Line 1185 See also

and

.Sx \&Dl .

.Ss \&Db

Switch debugging mode.

This macro is obsolete.

Its syntax is as follows:

No replacement is needed.

.Pp

It is ignored by

.D1 Pf \. Sx \&Db Cm on | off

.Xr mandoc 1

.Pp

and groff including its arguments.

This macro is ignored by

It was formerly used to toggle a debugging mode.

.Xr mandoc 1 .

.Ss \&Dc

Close a

.Sx \&Do

block.

Does not have any tail arguments.

.Ss \&Dd

Document date.

Document date for display in the page footer.

This is the mandatory first macro of any

.Nm

manual.

Line 1217 the special string

Line 1226 the special string

.Dq $\&Mdocdate$

can be given as an argument.

.It

A few alternative date formats are accepted as well

The traditional, purely numeric

and converted to the standard form.

.Xr man 7

format

.Ar year Ns \(en Ns Ar month Ns \(en Ns Ar day

is accepted, too.

.It

If a date string cannot be parsed, it is used verbatim.

.It

Line 1235 See also

Line 1247 See also

and

.Sx \&Os .

.Ss \&Dl

One-line intended display.

One-line indented display.

This is formatted as literal text and is useful for commands and

invocations.

It is followed by a newline.

Line 1278 See also

Line 1290 See also

and

.Sx \&Do .

.Ss \&Dt

Document title.

Document title for display in the page header.

This is the mandatory second macro of any

.Nm

file.

Its syntax is as follows:

.Bd -ragged -offset indent

.Pf \. Sx \&Dt

.Oo

.Ar TITLE

.Ar title

.Oo

.Ar section

.Op Ar volume

.Op Ar arch

.Oc

.Ed

.Pp

Its arguments are as follows:

.Bl -tag -width Ds -offset Ds

.Bl -tag -width section -offset 2n

.It Ar title

.It Ar TITLE

The document's title (name), defaulting to

.Dq UNKNOWN

.Dq UNTITLED

if unspecified.

It should be capitalised.

To achieve a uniform appearance of page header lines,

it should by convention be all caps.

.It Ar section

The manual section.

This may be one of

.Ar 1

.Cm 1

.Pq utilities ,

.Pq General Commands ,

.Ar 2

.Cm 2

.Pq system calls ,

.Pq System Calls ,

.Ar 3

.Cm 3

.Pq libraries ,

.Pq Library Functions ,

.Ar 3p

.Cm 3p

.Pq Perl libraries ,

.Pq Perl Library ,

.Ar 4

.Cm 4

.Pq devices ,

.Pq Device Drivers ,

.Ar 5

.Cm 5

.Pq file formats ,

.Pq File Formats ,

.Ar 6

.Cm 6

.Pq games ,

.Pq Games ,

.Ar 7

.Cm 7

.Pq miscellaneous ,

.Pq Miscellaneous Information ,

.Ar 8

.Cm 8

.Pq system utilities ,

.Pq System Manager's Manual ,

.Ar 9

.Pq kernel functions ,

.Ar X11

.Pq X Window System ,

.Ar X11R6

.Pq X Window System ,

.Ar unass

.Pq unassociated ,

.Ar local

.Pq local system ,

.Ar draft

.Pq draft manual ,

.Ar paper

.Cm 9

.Pq paper .

.Pq Kernel Developer's Manual .

It should correspond to the manual's filename suffix and defaults to

.Dq 1

the empty string if unspecified.

if unspecified.

.It Ar volume

This overrides the volume inferred from

.Ar section .

This field is optional, and if specified, must be one of

.Ar USD

.Pq users' supplementary documents ,

.Ar PS1

.Pq programmers' supplementary documents ,

.Ar AMD

.Pq administrators' supplementary documents ,

.Ar SMM

.Pq system managers' manuals ,

.Ar URM

.Pq users' reference manuals ,

.Ar PRM

.Pq programmers' reference manuals ,

.Ar KM

.Pq kernel manuals ,

.Ar IND

.Pq master index ,

.Ar MMI

.Pq master index ,

.Ar LOCAL

.Pq local manuals ,

.Ar LOC

.Pq local manuals ,

.Ar CON

.Pq contributed manuals .

.It Ar arch

This specifies the machine architecture a manual page applies to,

where relevant, for example

Line 1378 where relevant, for example

Line 1344 where relevant, for example

.Cm i386 ,

.Cm sparc64 .

The list of supported architectures varies by operating system.

The list of valid architectures varies by operating system.

For the full list of all architectures recognized by

.Xr mandoc 1 ,

see the file

.Pa arch.in

in the source distribution.

.El

.Pp

Examples:

.Dl \&.Dt FOO 1

.Dl \&.Dt FOO 4 KM

.Dl \&.Dt FOO 9 i386

.Pp

See also

Line 1430 See also

Line 1390 See also

.Sx \&Bx ,

.Sx \&Fx ,

.Sx \&Nx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Ec

Close a scope started by

.Sx \&Eo .

Line 1463 See also

Line 1422 See also

and

.Sx \&It .

.Ss \&Em

Denotes text that should be

Request an italic font.

.Em emphasised .

If the output device does not provide that, underline.

Note that this is a presentation term and should not be used for

stylistically decorating technical terms.

Depending on the output device, this is usually represented

using an italic font or underlined characters.

.Pp

This is most often used for stress emphasis (not to be confused with

importance, see

.Sx \&Sy ) .

In the rare cases where none of the semantic markup macros fit,

it can also be used for technical terms and placeholders, except

that for syntax elements,

.Sx \&Sy

and

.Sx \&Ar

are preferred, respectively.

.Pp

Examples:

.Dl \&.Em Warnings!

.Bd -literal -compact -offset indent

.Dl \&.Em Remarks :

Selected lines are those

\&.Em not

matching any of the specified patterns.

Some of the functions use a

\&.Em hold space

to save the pattern space for subsequent retrieval.

.Ed

.Pp

See also

.Sx \&Bf ,

Line 1481 See also

Line 1453 See also

and

.Sx \&Sy .

.Ss \&En

This macro is obsolete and not implemented in

This macro is obsolete.

.Xr mandoc 1 .

Use

.Sx \&Eo

or any of the other enclosure macros.

.Pp

It encloses its argument in the delimiters specified by the last

.Sx \&Es

macro.

.Ss \&Eo

An arbitrary enclosure.

Its syntax is as follows:

Line 1508 See also

Line 1486 See also

.Sx \&Dv

for general constants.

.Ss \&Es

This macro is obsolete and not implemented.

This macro is obsolete.

Use

.Sx \&Eo

or any of the other enclosure macros.

.Pp

It takes two arguments, defining the delimiters to be used by subsequent

.Sx \&En

macros.

.Ss \&Ev

Environmental variables such as those specified in

.Xr environ 7 .

Line 1540 arguments are treated as separate utilities.

Line 1525 arguments are treated as separate utilities.

See also

.Sx \&Rv .

.Ss \&Fa

Function argument.

Function argument or parameter.

Its syntax is as follows:

.Bd -ragged -offset indent

.Pf \. Sx \&Fa

.Op Cm argtype

.Qo

.Cm argname

.Op Ar argtype

.Op Ar argname

.Qc Ar \&...

.Ed

.Pp

This may be invoked for names with or without the corresponding type.

Each argument may be a name and a type (recommended for the

It is also used to specify the field name of a structure.

.Em SYNOPSIS

section), a name alone (for function invocations),

or a type alone (for function prototypes).

If both a type and a name are given or if the type consists of multiple

words, all words belonging to the same function argument have to be

given in a single argument to the

.Sx \&Fa

macro.

.Pp

This macro is also used to specify the field name of a structure.

.Pp

Most often, the

.Sx \&Fa

macro is used in the

.Em SYNOPSIS

within

.Sx \&Fo

section when documenting multi-line function prototypes.

blocks when documenting multi-line function prototypes.

If invoked with multiple arguments, the arguments are separated by a

comma.

Furthermore, if the following macro is another

Line 1566 the last argument will also have a trailing comma.

Line 1563 the last argument will also have a trailing comma.

Examples:

.Dl \&.Fa \(dqconst char *p\(dq

.Dl \&.Fa \(dqint a\(dq \(dqint b\(dq \(dqint c\(dq

.Dl \&.Fa foo

.Dl \&.Fa \(dqchar *\(dq size_t

.Pp

See also

.Sx \&Fo .

Line 1669 Invocations usually occur in the following context:

Line 1666 Invocations usually occur in the following context:

.br

.Pf \. Sx \&Fo Ar funcname

.br

.Pf \. Sx \&Fa Oo Ar argtype Oc Ar argname

.Pf \. Sx \&Fa Qq Ar argtype Ar argname

.br

\&.\.\.

.br

Line 1688 See also

Line 1685 See also

and

.Sx \&Ft .

.Ss \&Fr

This macro is obsolete and not implemented in

This macro is obsolete.

.Xr mandoc 1 .

No replacement markup is needed.

.Pp

It was used to show function return values.

It was used to show numerical function return values in an italic font.

The syntax was:

.Pp

.Dl Pf . Sx \&Fr Ar value

.Ss \&Ft

A function type.

Its syntax is as follows:

Line 1733 See also

Line 1727 See also

.Sx \&Bx ,

.Sx \&Dx ,

.Sx \&Nx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Hf

This macro is not implemented in

.Xr mandoc 1 .

Line 2053 See also

Line 2046 See also

.Sx \&Bx ,

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Ox ,

and

.Sx \&Ux .

.Sx \&Ox .

.Ss \&Oc

Close multi-line

.Sx \&Oo

Line 2084 Examples:

Line 2076 Examples:

See also

.Sx \&Oo .

.Ss \&Os

Document operating system version.

Operating system version for display in the page footer.

This is the mandatory third macro of

any

.Nm

Line 2096 Its syntax is as follows:

Line 2088 Its syntax is as follows:

The optional

.Ar system

parameter specifies the relevant operating system or environment.

Left unspecified, it defaults to the local operating system version.

It is suggested to leave it unspecified, in which case

This is the suggested form.

.Xr mandoc 1

uses its

.Fl Ios

argument, or, if that isn't specified either,

.Fa sysname

and

.Fa release

as returned by

.Xr uname 3 .

.Pp

Examples:

.Dl \&.Os

Line 2109 See also

and

.Sx \&Dt .

.Ss \&Ot

This macro is obsolete and not implemented in

This macro is obsolete.

.Xr mandoc 1 .

Use

.Sx \&Ft

instead; with

.Xr mandoc 1 ,

both have the same effect.

.Pp

Historical

.Nm

Line 2132 See also

Line 2136 See also

.Sx \&Bx ,

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Nx ,

and

.Sx \&Ux .

.Sx \&Nx .

.Ss \&Pa

An absolute or relative file system path, or a file or directory name.

If an argument is not provided, the character

Line 2198 See also

Line 2201 See also

Close quoted context opened by

.Sx \&Qo .

.Ss \&Ql

Format a single-quoted literal.

Request a literal font and enclose in single quotes.

For arguments of three or more characters, formatters other than

.Xr mandoc 1

usually omit the quotes on non-terminal output devices.

See also

.Sx \&Qq

.Sx \&Li

and

.Sx \&Sq .

.Ss \&Qo

Line 2308 and

Line 2314 and

Switches the spacing mode for output generated from macros.

Its syntax is as follows:

.Pp

.D1 Pf \. Sx \&Sm Cm on | off

.D1 Pf \. Sx \&Sm Op Cm on | off

.Pp

By default, spacing is

.Cm on .

Line 2317 When switched

Line 2323 When switched

no white space is inserted between macro arguments and between the

output generated from adjacent macros, but text lines

still get normal spacing between words and sentences.

.Pp

When called without an argument, the

.Sx \&Sm

macro toggles the spacing mode.

Using this is not recommended because it makes the code harder to read.

.Ss \&So

Multi-line version of

.Sx \&Sq .

Line 2354 and

Line 2365 and

.Sx \&Sx .

.Ss \&St

Replace an abbreviation for a standard with the full form.

The following standards are recognised:

The following standards are recognised.

Where multiple lines are given without a blank line in between,

they all refer to the same standard, and using the first form

is recommended.

.Bl -tag -width 1n

.It C language standards

.Pp

.Bl -tag -width "-p1003.1g-2000X" -compact

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-p1003.1-88

.It \-ansiC

.St -p1003.1-88

.St -ansiC

.It \-p1003.1-90

.It \-ansiC-89

.St -p1003.1-90

.St -ansiC-89

.It \-p1003.1-96

.St -p1003.1-96

.It \-p1003.1-2001

.St -p1003.1-2001

.It \-p1003.1-2004

.St -p1003.1-2004

.It \-p1003.1-2008

.St -p1003.1-2008

.It \-p1003.1

.St -p1003.1

.It \-p1003.1b

.St -p1003.1b

.It \-p1003.1b-93

.St -p1003.1b-93

.It \-p1003.1c-95

.St -p1003.1c-95

.It \-p1003.1d-99

.St -p1003.1d-99

.It \-p1003.1g-2000

.St -p1003.1g-2000

.It \-p1003.1i-95

.St -p1003.1i-95

.It \-p1003.1j-2000

.St -p1003.1j-2000

.It \-p1003.1q-2000

.St -p1003.1q-2000

.It \-p1003.2

.St -p1003.2

.It \-p1003.2-92

.St -p1003.2-92

.It \-p1003.2a-92

.St -p1003.2a-92

.It \-p1387.2

.St -p1387.2

.It \-p1387.2-95

.St -p1387.2-95

.It \-isoC

.St -isoC

.It \-isoC-90

.St -isoC-90

.br

The original C standard.

.Pp

.It \-isoC-amd1

.St -isoC-amd1

.Pp

.It \-isoC-tcor1

.St -isoC-tcor1

.Pp

.It \-isoC-tcor2

.St -isoC-tcor2

.Pp

.It \-isoC-99

.St -isoC-99

.br

The second major version of the C language standard.

.Pp

.It \-isoC-2011

.St -isoC-2011

.br

The third major version of the C language standard.

.El

.It POSIX.1 before the Single UNIX Specification

.Pp

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-p1003.1-88

.St -p1003.1-88

.It \-p1003.1

.St -p1003.1

.br

The original POSIX standard, based on ANSI C.

.Pp

.It \-p1003.1-90

.St -p1003.1-90

.It \-iso9945-1-90

.St -iso9945-1-90

.br

The first update of POSIX.1.

.Pp

.It \-p1003.1b-93

.St -p1003.1b-93

.It \-p1003.1b

.St -p1003.1b

.br

Real-time extensions.

.Pp

.It \-p1003.1c-95

.St -p1003.1c-95

.br

POSIX thread interfaces.

.Pp

.It \-p1003.1i-95

.St -p1003.1i-95

.br

Technical Corrigendum.

.Pp

.It \-p1003.1-96

.St -p1003.1-96

.It \-iso9945-1-96

.St -iso9945-1-96

.It \-iso9945-2-93

.br

.St -iso9945-2-93

Includes POSIX.1-1990, 1b, 1c, and 1i.

.It \-ansiC

.El

.St -ansiC

.It X/Open Portability Guide version 4 and related standards

.It \-ansiC-89

.Pp

.St -ansiC-89

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-ansiC-99

.St -ansiC-99

.It \-ieee754

.St -ieee754

.It \-iso8802-3

.St -iso8802-3

.It \-iso8601

.St -iso8601

.It \-ieee1275-94

.St -ieee1275-94

.It \-xpg3

.St -xpg3

.br

An XPG4 precursor, published in 1989.

.Pp

.It \-p1003.2

.St -p1003.2

.It \-p1003.2-92

.St -p1003.2-92

.It \-iso9945-2-93

.St -iso9945-2-93

.br

An XCU4 precursor.

.Pp

.It \-p1003.2a-92

.St -p1003.2a-92

.br

Updates to POSIX.2.

.Pp

.It \-xpg4

.St -xpg4

.br

Based on POSIX.1 and POSIX.2, published in 1992.

.El

.It Single UNIX Specification version 1 and related standards

.Pp

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-susv1

.St -susv1

.It \-xpg4.2

.St -xpg4.2

.It \-xpg4.3

.br

.St -xpg4.3

This standard was published in 1994.

It was used as the basis for UNIX 95 certification.

The following three refer to parts of it.

.Pp

.It \-xsh4.2

.St -xsh4.2

.Pp

.It \-xcurses4.2

.St -xcurses4.2

.Pp

.It \-p1003.1g-2000

.St -p1003.1g-2000

.br

Networking APIs, including sockets.

.Pp

.It \-svid4

.St -svid4 ,

.br

Published in 1995.

.El

.It Single UNIX Specification version 2 and related standards

.Pp

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-susv2

.St -susv2

This Standard was published in 1997

and is also called X/Open Portability Guide version 5.

It was used as the basis for UNIX 98 certification.

The following refer to parts of it.

.Pp

.It \-xbd5

.St -xbd5

.It \-xcu5

.Pp

.St -xcu5

.It \-xsh5

.St -xsh5

.Pp

.It \-xcu5

.St -xcu5

.Pp

.It \-xns5

.St -xns5

.It \-xns5.2

.St -xns5.2

.It \-xns5.2d2.0

.El

.St -xns5.2d2.0

.It Single UNIX Specification version 3

.It \-xcurses4.2

.Pp

.St -xcurses4.2

.Bl -tag -width "-p1003.1-2001" -compact

.It \-susv2

.It \-p1003.1-2001

.St -susv2

.St -p1003.1-2001

.It \-susv3

.St -susv3

.It \-svid4

.br

.St -svid4

This standard is based on C99, SUSv2, POSIX.1-1996, 1d, and 1j.

It is also called X/Open Portability Guide version 6.

It is used as the basis for UNIX 03 certification.

.Pp

.It \-p1003.1-2004

.St -p1003.1-2004

.br

The second and last Technical Corrigendum.

.El

.It Single UNIX Specification version 4

.Pp

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-p1003.1-2008

.St -p1003.1-2008

.It \-susv4

.St -susv4

.br

This standard is also called

X/Open Portability Guide version 7.

.Pp

.It \-p1003.1-2013

.St -p1003.1-2013

.br

This is the first Technical Corrigendum.

.El

.It Other standards

.Pp

.Bl -tag -width "-p1003.1g-2000" -compact

.It \-ieee754

.St -ieee754

.br

Floating-point arithmetic.

.Pp

.It \-iso8601

.St -iso8601

.br

Representation of dates and times, published in 1988.

.Pp

.It \-iso8802-3

.St -iso8802-3

.br

Ethernet local area networks.

.Pp

.It \-ieee1275-94

.St -ieee1275-94

.El

.Ss \&Sx

Reference a section or subsection in the same manual page.

The referenced section or subsection name must be identical to the

Line 2473 See also

Line 2591 See also

and

.Sx \&Ss .

.Ss \&Sy

Format enclosed arguments in symbolic

Request a boldface font.

.Pq Dq boldface .

Note that this is a presentation term and should not be used for

stylistically decorating technical terms.

.Pp

This is most often used to indicate importance or seriousness (not to be

confused with stress emphasis, see

.Sx \&Em ) .

When none of the semantic macros fit, it is also adequate for syntax

elements that have to be given or that appear verbatim.

.Pp

Examples:

.Bd -literal -compact -offset indent

\&.Sy Warning :

\&.Sy s

appears in the owner permissions, set-user-ID mode is set.

This utility replaces the former

\&.Sy dumpdir

program.

.Ed

.Pp

See also

.Sx \&Bf ,

.Sx \&Em ,

Line 2490 Table cell separator in

Line 2622 Table cell separator in

lists; can only be used below

.Sx \&It .

.Ss \&Tn

Format a tradename.

Supported only for compatibility, do not use this in new manuals.

.Pp

Even though the macro name

Since this macro is often implemented to use a small caps font,

.Pq Dq tradename

it has historically been used for acronyms (like ASCII) as well.

suggests a semantic function, historic usage is inconsistent, mostly

Such usage is not recommended because it would use the same macro

using it as a presentation-level macro to request a small caps font.

sometimes for semantical annotation, sometimes for physical formatting.

.Pp

Examples:

.Dl \&.Tn IBM

.Ss \&Ud

Supported only for compatibility, do not use this in new manuals.

Prints out

.Dq currently under development.

.Ss \&Ux

Format the

Supported only for compatibility, do not use this in new manuals.

.Ux

Prints out

name.

.Dq Ux .

Accepts no argument.

.Pp

Examples:

.Dl \&.Ux

.Pp

See also

.Sx \&At ,

.Sx \&Bsx ,

.Sx \&Bx ,

.Sx \&Dx ,

.Sx \&Fx ,

.Sx \&Nx ,

and

.Sx \&Ox .

.Ss \&Va

A variable name.

.Pp

Examples:

.Dl \&.Va foo

.Dl \&.Va const char *bar ;

.Pp

For function arguments and parameters, use

.Sx \&Fa

instead.

For declarations of global variables in the

.Em SYNOPSIS

section, use

.Sx \&Vt .

.Ss \&Vt

A variable type.

.Pp

This is also used for indicating global variables in the

.Em SYNOPSIS

section, in which case a variable name is also specified.

Line 2542 In the former case, this macro starts a new output lin

Line 2666 In the former case, this macro starts a new output lin

and a blank line is inserted in front if there is a preceding

function definition or include directive.

.Pp

Note that this should not be confused with

.Sx \&Ft ,

which is used for function return types.

.Pp

Examples:

.Dl \&.Vt unsigned char

.Dl \&.Vt extern const char * const sys_signame[] \&;

.Pp

For parameters in function prototypes, use

.Sx \&Fa

instead, for function return types

.Sx \&Ft ,

and for variable names outside the

.Em SYNOPSIS

section

.Sx \&Va ,

even when including a type with the name.

See also

.Sx MANUAL STRUCTURE

.Sx MANUAL STRUCTURE .

and

.Sx \&Va .

.Ss \&Xc

Close a scope opened by

.Sx \&Xo .

Line 2771 end of the line.

Line 2898 end of the line.

.It Sx \&D1 Ta \&No Ta \&Yes

.It Sx \&Dl Ta \&No Ta Yes

.It Sx \&Dq Ta Yes Ta Yes

.It Sx \&En Ta Yes Ta Yes

.It Sx \&Op Ta Yes Ta Yes

.It Sx \&Pq Ta Yes Ta Yes

.It Sx \&Ql Ta Yes Ta Yes

Line 2848 then the macro accepts an arbitrary number of argument

Line 2976 then the macro accepts an arbitrary number of argument

.It Sx \&Dv Ta Yes Ta Yes Ta >0

.It Sx \&Dx Ta Yes Ta Yes Ta n

.It Sx \&Em Ta Yes Ta Yes Ta >0

.It Sx \&En Ta \&No Ta \&No Ta 0

.It Sx \&Er Ta Yes Ta Yes Ta >0

.It Sx \&Es Ta \&No Ta \&No Ta 0

.It Sx \&Es Ta Yes Ta Yes Ta 2

.It Sx \&Ev Ta Yes Ta Yes Ta >0

.It Sx \&Ex Ta \&No Ta \&No Ta n

.It Sx \&Fa Ta Yes Ta Yes Ta >0

.It Sx \&Fd Ta \&No Ta \&No Ta >0

.It Sx \&Fl Ta Yes Ta Yes Ta n

.It Sx \&Fn Ta Yes Ta Yes Ta >0

.It Sx \&Fr Ta \&No Ta \&No Ta n

.It Sx \&Fr Ta Yes Ta Yes Ta >0

.It Sx \&Ft Ta Yes Ta Yes Ta >0

.It Sx \&Fx Ta Yes Ta Yes Ta n

.It Sx \&Hf Ta \&No Ta \&No Ta n

Line 2874 then the macro accepts an arbitrary number of argument

Line 3001 then the macro accepts an arbitrary number of argument

.It Sx \&Ns Ta Yes Ta Yes Ta 0

.It Sx \&Nx Ta Yes Ta Yes Ta n

.It Sx \&Os Ta \&No Ta \&No Ta n

.It Sx \&Ot Ta \&No Ta \&No Ta n

.It Sx \&Ot Ta Yes Ta Yes Ta >0

.It Sx \&Ox Ta Yes Ta Yes Ta n

.It Sx \&Pa Ta Yes Ta Yes Ta n

.It Sx \&Pf Ta Yes Ta Yes Ta 1

.It Sx \&Pp Ta \&No Ta \&No Ta 0

.It Sx \&Rv Ta \&No Ta \&No Ta n

.It Sx \&Sm Ta \&No Ta \&No Ta 1

.It Sx \&Sm Ta \&No Ta \&No Ta <2

.It Sx \&St Ta \&No Ta Yes Ta 1

.It Sx \&Sx Ta Yes Ta Yes Ta >0

.It Sx \&Sy Ta Yes Ta Yes Ta >0

Line 2996 Manually switching the font using the

Line 3123 Manually switching the font using the

.Ql \ef

font escape sequences is never required.

.Sh COMPATIBILITY

This section documents compatibility between mandoc and other

This section provides an incomplete list of compatibility issues

troff implementations, at this time limited to GNU troff

between mandoc and other troff implementations, at this time limited

to GNU troff

.Pq Qq groff .

The term

.Qq historic groff

Line 3106 certain list types.

Line 3234 certain list types.

can only be called by other macros, but not at the beginning of a line.

.It

.Sx \&%C

is not implemented.

is not implemented (up to and including groff-1.22.2).

.It

Historic groff only allows up to eight or nine arguments per macro input

line, depending on the exact situation.

Line 3124 in new groff and mandoc.

Line 3252 in new groff and mandoc.

.Sq \ef

.Pq font face

and

.Sq \ef

.Sq \eF

.Pq font family face

.Sx Text Decoration

escapes behave irregularly when specified within line-macro scopes.

Line 3141 The following features are unimplemented in mandoc:

Line 3269 The following features are unimplemented in mandoc:

.Fl file Ar file .

.It

.Sx \&Bd

.Fl offset Ar center

.Fl offset Cm center

and

.Fl offset Ar right .

.Fl offset Cm right .

Groff does not implement centred and flush-right rendering either,

but produces large indentations.

.It

The

.Sq \eh

.Pq horizontal position ,

.Sq \ev

.Pq vertical position ,

.Sq \em

.Pq text colour ,

.Sq \eM

.Pq text filling colour ,

.Sq \ez

.Pq zero-length character ,

.Sq \ew

.Pq string length ,

.Sq \ek

.Pq horizontal position marker ,

.Sq \eo

.Pq text overstrike ,

and

.Sq \es

.Pq text size

escape sequences are all discarded in mandoc.

.It

The

.Sq \ef

scaling unit is accepted by mandoc, but rendered as the default unit.

.It

In quoted literals, groff allows pairwise double-quotes to produce a

standalone double-quote in formatted output.

This is not supported by mandoc.

.El

.Sh SEE ALSO

.Xr man 1 ,

CVSweb