Index: head/share/man/man7/hier.7 =================================================================== --- head/share/man/man7/hier.7 (revision 325955) +++ head/share/man/man7/hier.7 (revision 325956) @@ -1,901 +1,901 @@ .\" Copyright (c) 1990, 1993 .\" The Regents of the University of California. 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. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. .\" .\" @(#)hier.7 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd June 10, 2017 +.Dd November 16, 2017 .Dt HIER 7 .Os .Sh NAME .Nm hier .Nd layout of file systems .Sh DESCRIPTION A sketch of the file system hierarchy. .Bl -tag -width "/libexec/" .It Pa / root directory of the file system .It Pa /bin/ user utilities fundamental to both single-user and multi-user environments .It Pa /boot/ programs and configuration files used during operating system bootstrap .Pp .Bl -tag -width "defaults/" -compact .It Pa defaults/ default bootstrapping configuration files; see .Xr loader.conf 5 .It Pa dtb/ Compiled flattened device tree (FDT) files; see .Xr fdt 4 and .Xr dtc 1 .It Pa firmware/ loadable kernel modules containing binary firmware for hardware that needs firmware downloaded to it to function .It Pa kernel/ pure kernel executable (the operating system loaded into memory at boot time) and kernel modules .It Pa modules/ third-party loadable kernel modules; see .Xr kldstat 8 .It Pa zfs/ .Xr zfs 8 zpool cache files .El .It Pa /cdrom/ default mount point for CD-ROM drives .It Pa /compat/ normally a link to .Pa /usr/compat . If not, then the .Pa /usr/compat comments apply .It Pa /dev/ device special files managed by .Xr devfs 5 .Pp .Bl -tag -width "net/" -compact .It Pa fd/ file descriptor files; see .Xr \&fd 4 .El .It Pa /etc/ system configuration files and scripts .Pp .Bl -tag -width "bluetooth/" -compact .It Pa defaults/ default system configuration files; see .Xr rc 8 .It Pa bluetooth/ bluetooth configuration files .It Pa localtime local timezone information; see .Xr ctime 3 .It Pa mail/ Sendmail control files .It Pa mtree/ mtree configuration files; see .Xr mtree 8 .It Pa pam.d/ configuration files for the Pluggable Authentication Modules (PAM) library .It Pa periodic/ scripts that are run daily, weekly, and monthly, via .Xr cron 8 ; see .Xr periodic 8 .It Pa rc.d/ system and daemon startup/control scripts; see .Xr rc 8 .It Pa security/ OpenBSM audit configuration files; see .Xr audit 8 .It Pa ppp/ ppp configuration files; see .Xr ppp 8 .It Pa ssh/ OpenSSH configuration files; see .Xr ssh 1 .It Pa ssl/ OpenSSL configuration files .El .It Pa /lib/ critical system libraries needed for binaries in .Pa /bin and .Pa /sbin .Pp .Bl -tag -width "geom/" -compact .It Pa geom/ class-specific libraries for the .Xr geom 8 utility .El .It Pa /libexec/ critical system utilities needed for binaries in .Pa /bin and .Pa /sbin .It Pa /media/ contains subdirectories to be used as mount points for removable media such as CDs, USB drives, and floppy disks .It Pa /mnt/ empty directory commonly used by system administrators as a temporary mount point .It Pa /net/ automounted NFS shares; see .Xr auto_master 5 .It Pa /proc/ process file system; see .Xr procfs 5 .It Pa /rescue/ statically linked programs for emergency recovery; see .Xr rescue 8 .It Pa /root/ root's HOME directory .It Pa /sbin/ system programs and administration utilities fundamental to both single-user and multi-user environments .It Pa /tmp/ temporary files that are not guaranteed to persist across system reboots .It Pa /usr/ contains the majority of user utilities and applications .Pp .Bl -tag -width "libdata/" -compact .It Pa bin/ common utilities, programming tools, and applications .It Pa compat/ files needed to support binary compatibility with other operating systems, such as Linux .It Pa include/ standard C include files .Pp .Bl -tag -width "kerberos5/" -compact .It Pa arpa/ C include files for Internet service protocols .It Pa bsnmp/ C include files for the SNMP daemon .It Pa c++/ C++ include files .It Pa cam/ C include files for the Common Access Methods Layer .Bl -tag -width "kerberos5/" -compact .It Pa scsi/ SCSI device on top of CAM .El .It Pa dev/ C include files for programming various .Fx devices .Bl -tag -width "kerberos5/" -compact .It Pa ic/ various header files describing driver- and bus-independent hardware circuits .It Pa ofw/ Open Firmware support .It Pa pbio/ 8255 PPI cards; see .Xr pbio 4 .It Pa ppbus/ parallel port bus; see .Xr ppbus 4 .It Pa usb/ USB subsystem .It Pa wi/ .Xr wi 4 WaveLAN driver .El .It Pa fs/ .Bl -tag -width "kerberos5/" -compact .It Pa fdescfs/ per-process file descriptors file system .It Pa msdosfs/ MS-DOS file system .It Pa nfs/ C include files for NFS (Network File System) version 2, 3 and 4 .It Pa nullfs/ loopback file system .It Pa procfs/ process file system .It Pa smbfs/ SMB/CIFS file system .It Pa udf/ UDF file system .It Pa unionfs union file system .El .It Pa geom/ GEOM framework .Bl -tag -width "kerberos5/" -compact .It Pa concat/ CONCAT GEOM class .It Pa gate/ GATE GEOM class .It Pa mirror/ MIRROR GEOM class .It Pa nop/ NOP GEOM class .It Pa raid3/ RAID3 GEOM class .It Pa stripe/ STRIPE GEOM class .El .Pp .It Pa libmilter/ C include files for libmilter, the .Xr sendmail 8 mail filter API .It Pa machine/ machine-specific C include files .It Pa net/ miscellaneous network C include files .Bl -tag -width "altq/" -compact .It Pa altq/ C include files for alternate queueing .El .It Pa net80211/ C include files for 802.11 wireless networking; see .Xr net80211 4 .It Pa netinet/ C include files for Internet standard protocols; see .Xr inet 4 .It Pa netinet6/ C include files for Internet protocol version 6; see .Xr inet6 4 .It Pa netipsec/ kernel key-management service; see .Xr ipsec 4 .It Pa netsmb/ SMB/CIFS requester .It Pa nfs/ C include files for NFS (Network File System) version 2 and 3 (legacy) .It Pa openssl/ OpenSSL (Cryptography/SSL toolkit) headers .It Pa protocols/ C include files for Berkeley service protocols .It Pa rpc/ remote procedure calls; see .Xr rpc 3 .It Pa rpcsvc/ definition of RPC service structures; see .Xr rpc 3 .It Pa security/ PAM; see .Xr pam 8 .It Pa sys/ system C include files (kernel data structures) .\" .It Pa tcl/ .\" Tcl language; .\" see .\" .Xr Tcl n .\" .Bl -tag -width "kerberos5/" -compact .\" .It Pa generic/ .\" ??? .\" .It Pa unix/ .\" ??? .\" .El .It Pa ufs/ C include files for UFS (The U-word File System) .Bl -tag -width "kerberos5/" -compact .It Pa ffs/ Fast file system .It Pa ufs/ UFS file system .El .It Pa vm/ virtual memory; see .Xr vmstat 8 .El .Pp .It Pa lib/ shared and archive .Xr ar 1 Ns -type libraries .Bl -tag -width Fl -compact .It Pa aout/ a.out archive libraries .It Pa compat/ shared libraries for compatibility .Bl -tag -width Fl -compact .It Pa aout/ a.out backward compatibility libraries .El .It Pa debug/ standalone debug data for the kernel and base system libraries and binaries .It Pa dtrace/ DTrace library scripts .It Pa engines/ OpenSSL (Cryptography/SSL toolkit) dynamically loadable engines .El .Pp .It Pa libdata/ miscellaneous utility data files .Bl -tag -width Fl -compact .It Pa gcc/ .Xr gcc 1 configuration data .It Pa ldscripts/ linker scripts; see .Xr ld 1 .El .Pp .It Pa libexec/ system daemons & system utilities (executed by other programs) .Bl -tag -width Fl -compact .It Pa aout/ utilities to manipulate a.out executables .It Pa elf/ utilities to manipulate ELF executables .It Pa lpr/ utilities and filters for LP print system; see .Xr lpr 1 .It Pa sendmail/ the .Xr sendmail 8 binary; see .Xr mailwrapper 8 .It Pa sm.bin/ restricted shell for .Xr sendmail 8 ; see .Xr smrsh 8 .El .Pp .It Pa local/ local executables, libraries, etc. Also used as the default destination for the .Xr ports 7 framework. Within .Pa local/ , the general layout sketched out by .Nm for .Pa /usr should be used. Exceptions are the .Pa man directory .Po directly under .Pa local/ rather than under .Pa local/share/ Ns Pc , ports documentation .Po in .Pa share/doc// Ns Pc , and .Pa /usr/local/etc .Po mimics .Pa /etc Ns Pc . .It Pa obj/ architecture-specific target tree produced by building the .Pa /usr/src tree .It Pa ports/ .Xr ports 7 , the .Fx ports collection. .It Pa sbin/ system daemons & system utilities (executed by users) .It Pa share/ architecture-independent files .Pp .Bl -tag -width "calendar/" -compact .It Pa calendar/ a variety of pre-fab calendar files; see .Xr calendar 1 .It Pa dict/ word lists; see .Xr look 1 .Pp .Bl -tag -width Fl -compact .It Pa freebsd .Fx Ns -specific terms, proper names, and jargon .It Pa web2 words from Webster's 2nd International .El .Pp .It Pa doc/ miscellaneous documentation; source for most of the printed .Bx manuals (available from the .Tn USENIX association) .Bl -tag -width Fl -compact .It Pa FAQ/ Frequently Asked Questions .It Pa IPv6/ implementation notes for IPv6 .It Pa es/ Spanish translations of documents in /usr/share/doc .It Pa handbook/ .Fx Handbook .It Pa ja/ Japanese translations of documents in /usr/share/doc .It Pa legal/ License files for vendor supplied firmwares .It Pa ncurses/ HTML documents pertaining to ncurses; see .Xr ncurses 3 .It Pa ntp/ HTML documents pertaining to the Network Time Protocol .It Pa ru/ Russian translations of documents in /usr/share/doc .It Pa tutorials/ .Fx tutorials .It Pa zh/ Chinese translations of documents in /usr/share/doc .El .Pp .It Pa examples/ various examples for users and programmers .It Pa firmware/ firmware images loaded by userland programs .It Pa games/ ASCII text files used by various games .It Pa keys/ known trusted and revoked keys. .Bl -tag -width "pkg/" -compact .It Pa pkg/ fingerprints for .Xr pkg 7 and .Xr pkg 8 .El .Pp .It Pa locale/ localization files; see .Xr setlocale 3 .It Pa man/ manual pages .It Pa misc/ miscellaneous system-wide ASCII text files .Bl -tag -width Fl -compact .It Pa fonts/ ??? .It Pa termcap terminal characteristics database; see .Xr termcap 5 .El .It Pa mk/ templates for make; see .Xr make 1 .It Pa nls/ national language support files; see .Xr mklocale 1 .It Pa security/ data files for security policies such as .Xr mac_lomac 4 .It Pa sendmail/ .Xr sendmail 8 configuration files .It Pa skel/ example .Pa .\& (dot) files for new accounts .It Pa snmp/ MIBs, example files and tree definitions for the SNMP daemon. .Bl -tag -width Fl -compact .It Pa defs/ tree definition files for use with .Xr gensnmptree 1 .It Pa mibs/ MIB files .El .It Pa syscons/ files used by syscons; see .Xr syscons 4 .Bl -tag -width "scrnmaps/" -compact .It Pa fonts/ console fonts; see .Xr vidcontrol 1 and .Xr vidfont 1 .It Pa keymaps/ console keyboard maps; see .Xr kbdcontrol 1 and .Xr kbdmap 1 .It Pa scrnmaps/ console screen maps .El .It Pa tabset/ tab description files for a variety of terminals; used in the termcap file; see .Xr termcap 5 .It Pa vi/ localization support and utilities for .Xr vi 1 .It Pa vt/ files used by vt; see .Xr vt 4 .Bl -tag -width "scrnmaps/" -compact .It Pa fonts/ console fonts; see .Xr vidcontrol 1 and .Xr vidfont 1 .It Pa keymaps/ console keyboard maps; see .Xr kbdcontrol 1 and .Xr kbdmap 1 .\" .It Pa scrnmaps/ .\" console screen maps .El .It Pa zoneinfo/ timezone configuration information; see .Xr tzfile 5 .El .It Pa src/ .Bx , third-party, and/or local source files .Pp .Bl -tag -width "kerberos5/" -compact .It Pa bin/ source code for files in /bin .It Pa cddl/ utilities covered by the Common Development and Distribution License .It Pa contrib/ source code for contributed software .It Pa crypto/ source code for contributed cryptography software .It Pa etc/ source code for files in .Pa /etc .It Pa gnu/ utilities covered by the GNU General Public License .It Pa include/ source code for files in .Pa /usr/include .It Pa kerberos5/ build infrastructure for kerberos version 5 .It Pa lib/ source code for files in .Pa /lib and .Pa /usr/lib .It Pa libexec/ source code for files in .Pa /usr/libexec .It Pa release/ files required to produce a .Fx release .It Pa rescue/ source code for files in .Pa /rescue .It Pa sbin/ source code for files in .Pa /sbin .It Pa secure/ build directory for files in .Pa /usr/src/crypto .It Pa share/ source for files in .Pa /usr/share .It Pa sys/ kernel source code .Bl -tag -width "opencrypto/" -compact .It Pa amd64/ AMD64 architecture support .It Pa arm/ ARM architecture support .It Pa arm64/ ARMv8 architecture support .It Pa boot/ bootloader code .It Pa cam/ .Xr cam 4 and .Xr ctl 4 .It Pa cddl/ CDDL-licensed optional sources, including ZFS and DTrace .It Pa ddb/ .Xr ddb 4 .It Pa fs/ most filesystems .It Pa dev/ device drivers .It Pa geom/ .Xr geom 4 .It Pa i386/ i386 (32 bit) architecture support .It Pa kern/ main part of the kernel .It Pa mips/ MIPS architecture support .It Pa net80211/ .Xr net80211 4 .It Pa netgraph/ .Xr netgraph 4 .It Pa netinet/ .Xr inet 4 .It Pa netinet6/ .Xr inet6 4 .It Pa netipsec/ .Xr ipsec 4 .It Pa netpfil/ .Xr ipfw 4 and .Xr pf 4 .It Pa opencrypto/ .Xr crypto 7 .It Pa powerpc/ PowerPC/POWER architecture support .It Pa riscv/ RISC-V architecture support .It Pa security/ .Xr audit 4 and .Xr mac 4 .It Pa sparc64/ SPARC64 architecture support .It Pa sys/ kernel headers .It Pa ufs/ Unix File System .It Pa x86/ code shared by AMD64 and i386 architectures .El .It Pa targets/ support for experimental DIRDEPS_BUILD .It Pa tests/ source code for files in .Pa /usr/tests .It Pa tools/ tools used for maintenance and testing of .Fx .It Pa usr.bin/ source code for files in .Pa /usr/bin .It Pa usr.sbin/ source code for files in .Pa /usr/sbin .El .Pp .It Pa tests/ The .Fx test suite. See .Xr tests 7 for more details. .El .It Pa /var/ multi-purpose log, temporary, transient, and spool files .Pp .Bl -tag -width "preserve/" -compact .It Pa account/ system accounting files .Pp .Bl -tag -width Fl -compact .It Pa acct execution accounting file; see .Xr acct 5 .El .Pp .It Pa at/ timed command scheduling files; see .Xr \&at 1 .Bl -tag -width "preserve/" -compact .It Pa jobs/ directory containing job files .It Pa spool/ directory containing output spool files .El .Pp .It Pa backups/ miscellaneous backup files .It Pa cache/ miscellaneous cached files .Bl -tag -width "pkg/" -compact .It Pa pkg/ cached packages for .Xr pkg 8 .El .Pp .It Pa crash/ default directory to store kernel crash dumps; see .Xr crash 8 and .Xr savecore 8 .It Pa cron/ files used by cron; see .Xr cron 8 .Bl -tag -width "preserve/" -compact .It Pa tabs/ crontab files; see .Xr crontab 5 .El .Pp .It Pa db/ miscellaneous automatically generated system-specific database files .It Pa empty/ empty directory for use by programs that need a specifically empty directory. Used for instance by .Xr sshd 8 for privilege separation. .It Pa games/ miscellaneous game status and score files .It Pa heimdal/ kerberos server databases; see .Xr kdc 8 .It Pa log/ miscellaneous system log files .Pp .Bl -tag -width Fl -compact .It Pa utx.lastlogin last login log; see .Xr getutxent 3 .It Pa utx.log login/logout log; see .Xr getutxent 3 .El .Pp .It Pa mail/ user mailbox files .It Pa msgs/ system messages database; see .Xr msgs 1 .It Pa preserve/ temporary home of files preserved after an accidental death of an editor; see .Xr \&ex 1 .It Pa quotas/ file system quota information files .It Pa run/ system information files describing various info about system since it was booted .Pp .Bl -tag -width Fl -compact .It Pa ppp/ writable by the .Dq network group for command connection sockets; see .Xr ppp 8 .It Pa utx.active database of current users; see .Xr getutxent 3 .El .Pp .It Pa rwho/ rwho data files; see .Xr rwhod 8 , .Xr rwho 1 , and .Xr ruptime 1 .It Pa spool/ miscellaneous printer and mail system spooling directories .Pp .Bl -tag -width Fl -compact .It Pa clientmqueue/ undelivered submission mail queue; see .Xr sendmail 8 .It Pa ftp/ commonly ~ftp; the anonymous ftp root directory .It Pa mqueue/ undelivered mail queue; see .Xr sendmail 8 .It Pa output/ line printer spooling directories .El .Pp .It Pa tmp/ temporary files that are kept between system reboots .Bl -tag -width Fl -compact .It Pa vi.recover/ the directory where recovery files are stored .El .It Pa yp/ the NIS maps .El .El .Sh NOTES This manual page documents the default .Fx file system layout, but the actual hierarchy on a given system is defined at the system administrator's discretion. A well-maintained installation will include a customized version of this document. .Sh SEE ALSO .Xr apropos 1 , .Xr find 1 , .Xr finger 1 , .Xr grep 1 , .Xr ls 1 , .Xr whatis 1 , .Xr whereis 1 , .Xr which 1 , .Xr fd 4 , .Xr devfs 5 , .Xr fsck 8 .Sh HISTORY A .Nm manual page appeared in .At v7 . Index: head/share/man/man9/style.9 =================================================================== --- head/share/man/man9/style.9 (revision 325955) +++ head/share/man/man9/style.9 (revision 325956) @@ -1,890 +1,890 @@ .\"- .\" Copyright (c) 1995-2005 The FreeBSD Project .\" 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 [your name] 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. .\" .\" From: @(#)style 1.14 (Berkeley) 4/28/95 .\" $FreeBSD$ .\" -.Dd October 5, 2016 +.Dd November 16, 2017 .Dt STYLE 9 .Os .Sh NAME .Nm style .Nd "kernel source file style guide" .Sh DESCRIPTION This file specifies the preferred style for kernel source files in the .Fx source tree. It is also a guide for the preferred userland code style. Many of the style rules are implicit in the examples. Be careful to check the examples before assuming that .Nm is silent on an issue. .Bd -literal /* * Style guide for FreeBSD. Based on the CSRG's KNF (Kernel Normal Form). * * @(#)style 1.14 (Berkeley) 4/28/95 * $FreeBSD$ */ /* * VERY important single-line comments look like this. */ /* Most single-line comments look like this. */ /* * Multi-line comments look like this. Make them real sentences. Fill * them so they look like real paragraphs. */ .Ed .Pp The copyright header should be a multi-line comment, with the first line of the comment having a dash after the star like so: .Bd -literal /*- * Copyright (c) 1984-2025 John Q. Public * All rights reserved. * * Long, boring license goes here, but trimmed for brevity */ .Ed .Pp An automatic script collects license information from the tree for all comments that start in the first column with .Dq Li "/*-" . If you desire to flag .Xr indent 1 to not reformat a comment that starts in the first column which is not a license or copyright notice, change the dash to a star for those comments. Comments starting in columns other than the first are never considered license statements. .Pp After any copyright header, there is a blank line, and the .Li $\&FreeBSD$ for non C/C++ language source files. Version control system ID tags should only exist once in a file (unlike in this one). Non-C/C++ source files follow the example above, while C/C++ source files follow the one below. All VCS (version control system) revision identification in files obtained from elsewhere should be maintained, including, where applicable, multiple IDs showing a file's history. In general, do not edit foreign IDs or their infrastructure. Unless otherwise wrapped (such as .Dq Li "#if defined(LIBC_SCCS)" ) , enclose both in .Dq Li "#if 0 ... #endif" to hide any uncompilable bits and to keep the IDs out of object files. Only add .Dq Li "From: " in front of foreign VCS IDs if the file is renamed. .Bd -literal #if 0 #ifndef lint static char sccsid[] = "@(#)style 1.14 (Berkeley) 4/28/95"; #endif /* not lint */ #endif #include __FBSDID("$FreeBSD$"); .Ed .Pp Leave one blank line before the header files. .Pp Kernel include files .Pa ( sys/*.h ) come first. If .In sys/cdefs.h is needed for .Fn __FBSDID , include it first. If either .In sys/types.h or .In sys/param.h is needed, include it before other include files. .Po .In sys/param.h includes .In sys/types.h ; do not include both. .Pc The remaining kernel headers should be sorted alphabetically. .Bd -literal #include /* Non-local includes in angle brackets. */ #include #include #include .Ed .Pp For a network program, put the network include files next. .Bd -literal #include #include #include #include #include .Ed .Pp Do not include files from .Pa /usr/include in the kernel. .Pp Leave a blank line before the next group, the .Pa /usr/include files, which should be sorted alphabetically by name. .Bd -literal #include .Ed .Pp Global pathnames are defined in .In paths.h . Pathnames local to the program go in .Qq Pa pathnames.h in the local directory. .Bd -literal #include .Ed .Pp Leave another blank line before the local include files. .Bd -literal #include "pathnames.h" /* Local includes in double quotes. */ .Ed .Pp Do not .Ic #define or declare names in the implementation namespace except for implementing application interfaces. .Pp The names of .Dq unsafe macros (ones that have side effects), and the names of macros for manifest constants, are all in uppercase. The expansions of expression-like macros are either a single token or have outer parentheses. Put a single tab character between the .Ic #define and the macro name. If a macro is an inline expansion of a function, the function name is all in lowercase and the macro has the same name all in uppercase. .\" XXX the above conflicts with ANSI style where the names are the .\" same and you #undef the macro (if any) to get the function. .\" It is not followed for MALLOC(), and not very common if inline .\" functions are used. Right-justify the backslashes; it makes it easier to read. If the macro encapsulates a compound statement, enclose it in a .Ic do loop, so that it can safely be used in .Ic if statements. Any final statement-terminating semicolon should be supplied by the macro invocation rather than the macro, to make parsing easier for pretty-printers and editors. .Bd -literal #define MACRO(x, y) do { \e variable = (x) + (y); \e (y) += 2; \e } while (0) .Ed .Pp When code is conditionally compiled using .Ic #ifdef or .Ic #if , a comment may be added following the matching .Ic #endif or .Ic #else to permit the reader to easily discern where conditionally compiled code regions end. This comment should be used only for (subjectively) long regions, regions greater than 20 lines, or where a series of nested .Ic #ifdef 's may be confusing to the reader. Exceptions may be made for cases where code is conditionally not compiled for the purposes of .Xr lint 1 , even though the uncompiled region may be small. The comment should be separated from the .Ic #endif or .Ic #else by a single space. For short conditionally compiled regions, a closing comment should not be used. .Pp The comment for .Ic #endif should match the expression used in the corresponding .Ic #if or .Ic #ifdef . The comment for .Ic #else and .Ic #elif should match the inverse of the expression(s) used in the preceding .Ic #if and/or .Ic #elif statements. In the comments, the subexpression .Dq Li defined(FOO) is abbreviated as .Dq Li FOO . For the purposes of comments, .Dq Ic #ifndef Li FOO is treated as .Dq Ic #if Li !defined(FOO) . .Bd -literal #ifdef KTRACE #include #endif #ifdef COMPAT_43 /* A large region here, or other conditional code. */ #else /* !COMPAT_43 */ /* Or here. */ #endif /* COMPAT_43 */ #ifndef COMPAT_43 /* Yet another large region here, or other conditional code. */ #else /* COMPAT_43 */ /* Or here. */ #endif /* !COMPAT_43 */ .Ed .Pp The project is slowly moving to use the .St -isoC-99 unsigned integer identifiers of the form .Vt uintXX_t in preference to the older .Bx Ns -style integer identifiers of the form .Vt u_intXX_t . New code should use the former, and old code should be converted to the new form if other major work is being done in that area and there is no overriding reason to prefer the older .Bx Ns -style . Like white-space commits, care should be taken in making .Vt uintXX_t only commits. .Pp Similarly, the project is slowly moving to use the .St -isoC-99 .Vt bool in preference to the older .Vt int or .Vt boolean_t . New code should use .Vt bool , and old code may be converted if it is reasonable to do so. Literal values are named .Dv true and .Dv false . These are preferred to the old spellings .Dv TRUE and .Dv FALSE . Userspace code should include .In stdbool.h , while kernel code should include .In sys/types.h . .Pp Enumeration values are all uppercase. .Bd -literal enum enumtype { ONE, TWO } et; .Ed .Pp The use of internal_underscores in identifiers is preferred over camelCase or TitleCase. .Pp In declarations, do not put any whitespace between asterisks and adjacent tokens, except for tokens that are identifiers related to types. (These identifiers are the names of basic types, type qualifiers, and .Ic typedef Ns -names other than the one being declared.) Separate these identifiers from asterisks using a single space. .Pp When declaring variables in structures, declare them sorted by use, then by size (largest to smallest), and then in alphabetical order. The first category normally does not apply, but there are exceptions. Each one gets its own line. Try to make the structure readable by aligning the member names using either one or two tabs depending upon your judgment. You should use one tab only if it suffices to align at least 90% of the member names. Names following extremely long types should be separated by a single space. .Pp Major structures should be declared at the top of the file in which they are used, or in separate header files if they are used in multiple source files. Use of the structures should be by separate declarations and should be .Ic extern if they are declared in a header file. .Bd -literal struct foo { struct foo *next; /* List of active foo. */ struct mumble amumble; /* Comment for mumble. */ int bar; /* Try to align the comments. */ struct verylongtypename *baz; /* Won't fit in 2 tabs. */ }; struct foo *foohead; /* Head of global foo list. */ .Ed .Pp Use .Xr queue 3 macros rather than rolling your own lists, whenever possible. Thus, the previous example would be better written: .Bd -literal #include struct foo { LIST_ENTRY(foo) link; /* Use queue macros for foo lists. */ struct mumble amumble; /* Comment for mumble. */ int bar; /* Try to align the comments. */ struct verylongtypename *baz; /* Won't fit in 2 tabs. */ }; LIST_HEAD(, foo) foohead; /* Head of global foo list. */ .Ed .Pp Avoid using typedefs for structure types. Typedefs are problematic because they do not properly hide their underlying type; for example you need to know if the typedef is the structure itself or a pointer to the structure. In addition they must be declared exactly once, whereas an incomplete structure type can be mentioned as many times as necessary. Typedefs are difficult to use in stand-alone header files: the header that defines the typedef must be included before the header that uses it, or by the header that uses it (which causes namespace pollution), or there must be a back-door mechanism for obtaining the typedef. .Pp When convention requires a .Ic typedef , make its name match the struct tag. Avoid typedefs ending in .Dq Li _t , except as specified in Standard C or by .Tn POSIX . .Bd -literal /* Make the structure name match the typedef. */ typedef struct bar { int level; } BAR; typedef int foo; /* This is foo. */ typedef const long baz; /* This is baz. */ .Ed .Pp All functions are prototyped somewhere. .Pp Function prototypes for private functions (i.e., functions not used elsewhere) go at the top of the first source module. Functions local to one source module should be declared .Ic static . .Pp Functions used from other parts of the kernel are prototyped in the relevant include file. Function prototypes should be listed in a logical order, preferably alphabetical unless there is a compelling reason to use a different ordering. .Pp Functions that are used locally in more than one module go into a separate header file, e.g.\& .Qq Pa extern.h . .Pp Do not use the .Dv __P macro. .Pp In general code can be considered .Dq "new code" when it makes up about 50% or more of the file(s) involved. This is enough to break precedents in the existing code and use the current .Nm guidelines. .Pp The kernel has a name associated with parameter types, e.g., in the kernel use: .Bd -literal void function(int fd); .Ed .Pp In header files visible to userland applications, prototypes that are visible must use either .Dq protected names (ones beginning with an underscore) or no names with the types. It is preferable to use protected names. E.g., use: .Bd -literal void function(int); .Ed .Pp or: .Bd -literal void function(int _fd); .Ed .Pp Prototypes may have an extra space after a tab to enable function names to line up: .Bd -literal static char *function(int _arg, const char *_arg2, struct foo *_arg3, struct bar *_arg4); static void usage(void); /* * All major routines should have a comment briefly describing what * they do. The comment before the "main" routine should describe * what the program does. */ int main(int argc, char *argv[]) { char *ep; long num; int ch; .Ed .Pp For consistency, .Xr getopt 3 should be used to parse options. Options should be sorted in the .Xr getopt 3 call and the .Ic switch statement, unless parts of the .Ic switch cascade. Elements in a .Ic switch statement that cascade should have a .Li FALLTHROUGH comment. Numerical arguments should be checked for accuracy. Code which is unreachable for non-obvious reasons may be marked /* .Li NOTREACHED */. .Bd -literal while ((ch = getopt(argc, argv, "abNn:")) != -1) switch (ch) { /* Indent the switch. */ case 'a': /* Don't indent the case. */ aflag = 1; /* Indent case body one tab. */ /* FALLTHROUGH */ case 'b': bflag = 1; break; case 'N': Nflag = 1; break; case 'n': num = strtol(optarg, &ep, 10); if (num <= 0 || *ep != '\e0') { warnx("illegal number, -n argument -- %s", optarg); usage(); } break; case '?': default: usage(); } argc -= optind; argv += optind; .Ed .Pp Space after keywords .Pq Ic if , while , for , return , switch . Two styles of braces .Ql ( \&{ and .Ql \&} ) are allowed for single line statements. Either they are used for all single statements, or they are used only where needed for clarity. Usage within a function should be consistent. Forever loops are done with .Ic for Ns 's , not .Ic while Ns 's . .Bd -literal for (p = buf; *p != '\e0'; ++p) ; /* nothing */ for (;;) stmt; for (;;) { z = a + really + long + statement + that + needs + two + lines + gets + indented + four + spaces + on + the + second + and + subsequent + lines; } for (;;) { if (cond) stmt; } if (val != NULL) val = realloc(val, newsize); .Ed .Pp Parts of a .Ic for loop may be left empty. Do not put declarations inside blocks unless the routine is unusually complicated. .Bd -literal for (; cnt < 15; cnt++) { stmt1; stmt2; } .Ed .Pp Indentation is an 8 character tab. Second level indents are four spaces. If you have to wrap a long statement, put the operator at the end of the line. .Bd -literal while (cnt < 20 && this_variable_name_is_too_long && ep != NULL) z = a + really + long + statement + that + needs + two + lines + gets + indented + four + spaces + on + the + second + and + subsequent + lines; .Ed .Pp Do not add whitespace at the end of a line, and only use tabs followed by spaces to form the indentation. Do not use more spaces than a tab will produce and do not use spaces in front of tabs. .Pp Closing and opening braces go on the same line as the .Ic else . Braces that are not necessary may be left out. .Bd -literal if (test) stmt; else if (bar) { stmt; stmt; } else stmt; .Ed .Pp No spaces after function names. Commas have a space after them. No spaces after .Ql \&( or .Ql \&[ or preceding .Ql \&] or .Ql \&) characters. .Bd -literal error = function(a1, a2); if (error != 0) exit(error); .Ed .Pp Unary operators do not require spaces, binary operators do. Do not use parentheses unless they are required for precedence or unless the statement is confusing without them. Remember that other people may confuse easier than you. Do YOU understand the following? .Bd -literal a = b->c[0] + ~d == (e || f) || g && h ? i : j >> 1; k = !(l & FLAGS); .Ed .Pp Exits should be 0 on success, or 1 on failure. .Bd -literal exit(0); /* * Avoid obvious comments such as * "Exit 0 on success." */ } .Ed .Pp The function type should be on a line by itself preceding the function. The opening brace of the function body should be on a line by itself. .Bd -literal static char * function(int a1, int a2, float fl, int a4) { .Ed .Pp When declaring variables in functions declare them sorted by size, then in alphabetical order; multiple ones per line are okay. If a line overflows reuse the type keyword. .Pp Be careful to not obfuscate the code by initializing variables in the declarations. Use this feature only thoughtfully. DO NOT use function calls in initializers. .Bd -literal struct foo one, *two; double three; int *four, five; char *six, seven, eight, nine, ten, eleven, twelve; four = myfunction(); .Ed .Pp Do not declare functions inside other functions; ANSI C says that such declarations have file scope regardless of the nesting of the declaration. Hiding file declarations in what appears to be a local scope is undesirable and will elicit complaints from a good compiler. .Pp Casts and .Ic sizeof Ns 's are not followed by a space. Note that .Xr indent 1 does not understand this rule. .Ic sizeof Ns 's are written with parenthesis always. The redundant parenthesis rules do not apply to .Fn sizeof var instances. .Pp .Dv NULL is the preferred null pointer constant. Use .Dv NULL instead of .Vt ( "type *" ) Ns 0 or .Vt ( "type *" ) Ns Dv NULL in contexts where the compiler knows the type, e.g., in assignments. Use .Vt ( "type *" ) Ns Dv NULL in other contexts, in particular for all function args. (Casting is essential for variadic args and is necessary for other args if the function prototype might not be in scope.) Test pointers against .Dv NULL , e.g., use: .Bd -literal (p = f()) == NULL .Ed .Pp not: .Bd -literal !(p = f()) .Ed .Pp Do not use .Ic \&! for tests unless it is a boolean, e.g.\& use: .Bd -literal if (*p == '\e0') .Ed .Pp not: .Bd -literal if (!*p) .Ed .Pp Routines returning .Vt "void *" should not have their return values cast to any pointer type. .Pp Values in .Ic return statements should be enclosed in parentheses. .Pp Use .Xr err 3 or .Xr warn 3 , do not roll your own. .Bd -literal if ((four = malloc(sizeof(struct foo))) == NULL) err(1, (char *)NULL); if ((six = (int *)overflow()) == NULL) errx(1, "number overflowed"); return (eight); } .Ed .Pp Old-style function declarations look like this: .Bd -literal static char * function(a1, a2, fl, a4) int a1, a2; /* Declare ints, too, don't default them. */ float fl; /* Beware double vs. float prototype differences. */ int a4; /* List in order declared. */ { .Ed .Pp Use ANSI function declarations unless you explicitly need K&R compatibility. Long parameter lists are wrapped with a normal four space indent. .Pp Variable numbers of arguments should look like this: .Bd -literal #include void vaf(const char *fmt, ...) { va_list ap; va_start(ap, fmt); STUFF; va_end(ap); /* No return needed for void functions. */ } static void usage() { /* Insert an empty line if the function has no local variables. */ .Ed .Pp Use .Xr printf 3 , not .Xr fputs 3 , .Xr puts 3 , .Xr putchar 3 , whatever; it is faster and usually cleaner, not to mention avoiding stupid bugs. .Pp Usage statements should look like the manual pages .Sx SYNOPSIS . The usage statement should be structured in the following order: .Bl -enum .It Options without operands come first, in alphabetical order, inside a single set of brackets .Ql ( \&[ and .Ql \&] ) . .It Options with operands come next, also in alphabetical order, with each option and its argument inside its own pair of brackets. .It Required arguments (if any) are next, listed in the order they should be specified on the command line. .It Finally, any optional arguments should be listed, listed in the order they should be specified, and all inside brackets. .El .Pp A bar .Pq Ql \&| separates .Dq either-or options/arguments, and multiple options/arguments which are specified together are placed in a single set of brackets. .Bd -literal -offset 4n "usage: f [-aDde] [-b b_arg] [-m m_arg] req1 req2 [opt1 [opt2]]\en" "usage: f [-a | -b] [-c [-dEe] [-n number]]\en" .Ed .Bd -literal (void)fprintf(stderr, "usage: f [-ab]\en"); exit(1); } .Ed .Pp Note that the manual page options description should list the options in pure alphabetical order. That is, without regard to whether an option takes arguments or not. The alphabetical ordering should take into account the case ordering shown above. .Pp New core kernel code should be reasonably compliant with the .Nm guides. The guidelines for third-party maintained modules and device drivers are more relaxed but at a minimum should be internally consistent with their style. .Pp Stylistic changes (including whitespace changes) are hard on the source repository and are to be avoided without good reason. Code that is approximately .Fx KNF .Nm compliant in the repository must not diverge from compliance. .Pp Whenever possible, code should be run through a code checker (e.g., various static analyzers or .Nm cc Fl Wall ) and produce minimal warnings. .Sh SEE ALSO .Xr indent 1 , .Xr err 3 , .Xr warn 3 , .Xr style.Makefile 5 .Sh HISTORY This manual page is largely based on the .Pa src/admin/style/style file from the .Bx 4.4 Lite2 release, with occasional updates to reflect the current practice and desire of the .Fx project. .Pa src/admin/style/style is a codification by the CSRG of the programming style of Ken Thompson and Dennis Ritchie in .At v6 .