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This appendix describes most of the environment variables that are commonly used
under QNX Neutrino.
Use these links to locate an entry quickly:
A ¦
B ¦
C ¦
D ¦
E ¦
F ¦
G ¦
H ¦
I ¦
J ¦
L ¦
M ¦
N ¦
O ¦
P ¦
Q ¦
R ¦
S ¦
T ¦
U
For general information about setting environment variables, see the
Configuring Your Environment
chapter of the Neutrino User's Guide;
for specific information, see the related utilities and programs.
- ABLANG
- A language code (e.g. en_CA for Canadian English) that a
multilingual Photon application uses to determine what language to display.
For more information, see the
International Language Support
chapter of the Photon Programmer's Guide; for the currently
supported codes, see /usr/photon/appbuilder/languages.def.
- ABLPATH
- A list of directories where you want a multilingual Photon application
to search for translation files.
For more information, see the
International Language Support
chapter of the Photon Programmer's Guide, and
ph
in the Utilities Reference.
- AB_RESOVRD
- A path variable that lists directories to search for resource records
for applications built with PhAB.
See the
Photon in Embedded Systems
appendix of the Photon Programmer's Guide.
- ACCEPT_LANGUAGE
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the languages that can be read by the remote client.
For more information, see
slinger
in the Utilities Reference.
- AUTOCONNECT
- In order for the
/etc/autoconnect
to be run, this environment variable must be defined and set to 1.
For more information, see
/etc/autoconnect
in the Utilities Reference.
- BROADCAST
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the client broadcast address that was obtained from the server.
- CMD_INT
- Slinger uses this environment variable to determine the pathname or name
of the shell program used to interpret the string passed to the SSI command,
exec cmd.
For more information, see
slinger
in the Utilities Reference.
- COLUMNS
- The number of character columns on the screen.
- CONTENT_LENGTH
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the length of the attached information in the case of a POST.
For more information, see
slinger
in the Utilities Reference.
- CONTENT_TYPE
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the type of the attached information in the case of a POST.
For more information, see
slinger
in the Utilities Reference.
- DISPLAY
- The name of the physical display on which to draw.
- DL_DEBUG
- Display debugging information about dynamically loaded libraries as
they're opened.
- DOCUMENT_ROOT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the location of data files.
(Same as HTTPD_ROOT_DIR.)
For more information, see
slinger
in the Utilities Reference.
- DONT_USE_LINK_UNLINK
- Indicates to
lpr
to use rename() instead of link() or
unlink().
- EDITOR
- The path of the editor you'd like to use by default.
- EXINIT
- Default
elvis
option settings.
If set, the contents of this environment variable are executed on startup as
a series of ex commands.
- FILENAME
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the filename supplied in the server response.
- FORWARDED
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name of the proxy server through which the web page is being
processed.
For more information, see
slinger
in the Utilities Reference.
- FROM
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name of the remote client user.
For more information, see
slinger
in the Utilities Reference.
- GATEWAY
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the gateway that the client is to use.
- GATEWAY_INTERFACE
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name and version of the Common Gateway Interface served
on Slinger.
For more information, see
slinger
in the Utilities Reference.
- GNUTARGET
- Specifies the target (output file format) for GNU utilities.
For more information, see the
Selecting the Target System
appendix of the Utilities Reference.
- GZIP
- A set of default options for
gzip
- HOME
- Your current working directory when you first log in.
It's specified as one of the fields for each user in
/etc/passwd.
For more information, see
passwd
in the Utilities Reference.
- HOSTALIASES
- The name of a file containing aliases for hosts.
For more information, see
gethostbyname()
in the Library Reference.
- HOSTNAME
- The name of the host machine.
- HTTPD_ROOT_DIR
- The name of the directory where Slinger looks for data files.
The default is /usr/local/httpd.
For more information, see
slinger
in the Utilities Reference.
- HTTPD_ROOT_DOC
- The name of the root document (e.g. index.html) in Slinger.
For more information, see
slinger
in the Utilities Reference.
- HTTPD_SCRIPTALIAS
- The directory where Slinger looks for the CGI executables.
For more information, see
slinger
in the Utilities Reference.
- HTTP_ACCEPT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the MIME types that the client accepts, as given by HTTP
headers.
For more information, see
slinger
in the Utilities Reference.
- HTTP_USER_AGENT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the browser that the client is using to send requests.
For more information, see
slinger
in the Utilities Reference.
- INTERFACE
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the interface that was configured (e.g. en0).
- IOPORT
- The
pccard-launch
utility sets this environment variable to indicate
the hex address of the I/O port (e.g. 320).
- IOPORT2
- The
pccard-launch
utility sets this environment variable to indicate
the hex address of the second I/O port, if assigned.
- IOPORT2SZ
- The
pccard-launch
utility sets this environment variable to indicate
the size of the second I/O port, if assigned.
- IOPORTSZ
- The
pccard-launch
utility sets this environment variable to indicate
the size of the I/O port (e.g. 32).
- IPADDRESS
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the client IP address that was obtained from the server.
- IRQ
- The
pccard-launch
utility sets this environment variable to indicate
the IRQ of the device.
- IVE_HOME
- Used by Java VM.
- J9PLUGIN_ARGS
- Arguments passed to Browser Java plugins.
- LANG
- The locale to use for the locale categories.
|
QNX Neutrino currently supports only the POSIX (i.e. C) locale.
|
- LC_TYPE
- The locale for character classification, used by
uniq
to determine the characters constituting a blank in the current locale.
|
QNX Neutrino currently supports only the POSIX (i.e. C) locale.
|
- LDEMULATION
- Specifies the linker emulation.
For more information, see the
Selecting the Target System
appendix of the Utilities Reference.
- LD_LIBRARY_PATH
- A path to search for shared libraries for a native linker.
For more information, see
ld
in the Utilities Reference
- LD_PRELOAD
- A list of full paths to the shared libraries on an ELF system that you
want to load before loading other libraries.
Use a colon (:) to separate the libraries in this list.
You can use this environment variable to add or change functionality
when you run a program.
For setuid or setgid ELF binaries, only libraries in
the standard search directories that are also setuid
will be loaded.
See
ld
in the Utilities Reference, and
dlopen()
in the QNX Neutrino Library Reference.
- LD_RUN_PATH
- A path to search for shared libraries on an ELF system.
For more information, see
ld
in the Utilities Reference
- LEASEEXPIRES
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the time at which the lease expires.
- LEASEOBTAINED
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the time at which the lease was obtained.
- LESS
- Options that you want to pass to
less
automatically.
- LESSEDIT
- The editor prototype string (used for the v command in
less).
- LINES
- The number of character lines on the screen.
- LOCALDOMAIN
- The local domain name.
For more information, see
res_init()
in the Library Reference.
- LOGNAME
- The userid you used to login; the same as USERNAME.
- MAKEFLAGS
- A set of default options for
make.
- MALLOC_OPTIONS
- Controls how
calloc(),
malloc(),
and
realloc()
behave if you specify a size of 0 (or a value of
0 for the n argument to calloc()).
The V (“System V”) and R
(“use the realloc() behavior of QNX Neutrino 6.4.0
and earlier”) columns below indicate how the
functions behave if the value of MALLOC_OPTIONS
includes that letter:
Function
|
Default
|
V
|
R
|
calloc(n, 0)
|
Non-NULL
|
NULL
|
No effect
|
malloc(0)
|
Non-NULL
|
NULL
|
No effect
|
realloc(NULL, 0)
|
Non-NULL
|
NULL
|
No effect
|
realloc(non-NULL, 0)
|
Non-NULL
|
NULL
|
NULL
|
In all the above cases, if the function returns a non-NULL
pointer, it's valid only for a corresponding call to
free()
or realloc().
- MIBFILE
- The location of the
mib.txt
file.
- MKIFS_PATH
- A colon-separated list of directories that
mkifs
should use to search for host files to be included in an OS image.
- MORE
- Default options for
more
- NAMESERVER1, NAMESERVER2
- The
dhcp.client
passes these environment variables to the
/etc/dhcp/dhcp-up script.
They indicate the nameservers that the client is to use.
- NAME_MAX
- The maximum permitted length of a component of a pathname.
- NETMASK
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the client netmask that was obtained from the server.
- OPTIONx
- The
dhcp.client
passes these additional environment variables (where x is the
option number) to the /etc/dhcp/dhcp-up script.
- PATH
- A colon-separated list of directories that are searched when the
shell looks for commands and .'d files.
An empty string resulting from a leading or trailing colon, or two adjacent
colons is treated as a ., the current directory.
For more information, see
ksh
in the Utilities Reference.
- PATH_INFO
- Slinger sets this environment variable, for use by CGI scripts.
It indicates extra path information sent.
For more information, see
slinger
in the Utilities Reference.
- PATH_MAX
- The maximum permitted length of a pathname.
- PATH_TRANSLATED
- Slinger sets this environment variable, for use by CGI scripts.
It's the same as the PATH_INFO appended to the pathname in
HTTPD_ROOT_DIR.
For more information, see
slinger
in the Utilities Reference.
- PHEXIT_DISABLE
- Set this environment variable to turn off the Photon Login dialog's Exit
button so that users won't be able to exit to text mode.
For more information, see
phlogin
in the Utilities Reference.
- PHFONT
- The registered name of the font server (e.g. /dev/phfont).
For more information, see
ph
in the Utilities Reference.
- PHFONT_USE_EXTERNAL
- If this environment variable exists,
io-graphics
runs the font manager as a separate process (see
phfont)
instead of using
phfont.so.
You should set this environment variable for systems that have remote
clients accessing font services on the host machine (e.g.
phindows,
phditto).
- PHFONTMEM
- The size of an area in shared memory to set up between the task and the
Photon font server for returning text bitmaps (normally required only by
graphics drivers).
For more information, see
PfAttach()
in the Photon Library Reference.
- PHFONTOPTS
- Options to pass to the Photon font server.
For more information, see
phfont.
- PHGFX
- The full command that you want the
ph
script to use instead of the default commands to start the graphics driver.
- PHINPUT
- The full command that you want the
ph
script to use instead of the default commands to start the input driver.
- PHINSTANCE
- The number of times that Photon has been instantiated.
For more information, see
phlogin
in the Utilities Reference.
- PHOTON
- The name of the Photon device (usually /dev/photon).
For more information, see
ph
in the Utilities Reference.
- PHOTONOPTS
- (Windows-hosted version only)
Additional options you want to pass to the Photon server when it starts.
- PHOTON_PATH
- The name of the root directory containing Photon files (usually
/usr/photon).
For more information, see
ph
in the Utilities Reference.
- PHOTON2_PATH
- Internal use only.
- PHSTART
- Internal use only.
- PHTK_PATH
- Internal use only.
- PHWM
- The name of the Window Manager to start when you start Photon.
For more information, see
ph
in the Utilities Reference.
- PHWMEXIT
- If you set this environment variable, Photon disables the confirmation
dialog when you exit Photon.
For more information, see
pwm
in the Utilities Reference.
- PHWMOPTS
- Options you want to pass to the window manager when it starts.
For more information, see
pwm
in the Utilities Reference.
- POSIX_STRICT
- Indicates that utilities must interpret options according to POSIX
specifications.
- PRINTER
- The name of the default printer, used by
lpr.
- PROCESSOR
- Specifies the target CPU when building an image filesystem.
If not set, the default is the same as the CPU of the host system
(e.g. x86).
For more information, see
mkifs
in the Utilities Reference.
- PTERMPAL
- The pathname of the palette file for
pterm.
- PTERMRC
- The name of a local configuration file for
pterm.
- PWMOPTS
- (Windows-hosted version only)
Options you want to pass to the window manager when it starts.
For more information, see
pwm
in the Utilities Reference.
- PWM_PRINTSCRN_APP
- The application to start when the Print Scrn key is pressed.
The default is
snapshot.
- PYTHONCASEOK
- Ignore case in Python import statements (Windows).
- PYTHONDEBUG
- Display debugging output from the
python
parser.
- PYTHONHOME
- An alternate prefix directory (or
prefix:exec_prefix) for Python.
The default module search path uses
prefix/pythonX.X.
- PYTHONINSPECT
- Inspect interactively after running the Python script,
and force prompts, even if stdin doesn't appear to be a terminal.
- PYTHONOPTIMIZE
- Optimize the generated Python byte code.
- PYTHONPATH
- A colon-separated list of directories prefixed to the
default module search path for Python.
The result is stored in sys.path.
- PYTHONSTARTUP
- The file to execute on interactive startup of Python (no default).
- PYTHONUNBUFFERED
- Use unbuffered binary for stdout and stderr.
See the Python documentation for details on internal buffering.
- PYTHONVERBOSE
- Make Python be verbose (trace import statements).
- QCC_CONF_PATH
- The name of the directory that contains the configuration files for
qcc.
- QNX_HELP_PATH
- The location of the top-level QNX help. This environment variable is used by helpviewer to locate help topics.
- QNX_HELP_HOME_PAGE
- The location of the “home page” for helpviewer.
- QNX_HOST
- The location of host-specific files for all development hosts.
- QNX_TARGET
- The location of target backends on the host machine.
- QUERY_STRING
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the raw query string sent from the remote client.
For more information, see
slinger
in the Utilities Reference.
- REFERER
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the URL of the HTML page that referred the remote client to this
web page.
For more information, see
slinger
in the Utilities Reference.
- REMOTE_ADDR
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the IP address of the remote client.
For more information, see
slinger
in the Utilities Reference.
- REMOTE_HOST
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the hostname of the remote client.
For more information, see
slinger
in the Utilities Reference.
- REMOTE_IDENT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the remote username if supporting RFC 931
identification.
For more information, see
slinger
in the Utilities Reference.
- REMOTE_PORT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the port of the remote client.
For more information, see
slinger
in the Utilities Reference.
- REMOTE_USER
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the username used to validate authentication from the remote
client.
For more information, see
slinger
in the Utilities Reference.
- REQUEST_METHOD
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the method by which the current web page was requested
(GET or POST).
For more information, see
slinger
in the Utilities Reference.
- RESCONF
- An way of overriding configuration strings in the
resolv.conf
file.
- SCRIPT_NAME
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name of the script being executed.
For more information, see
slinger
in the Utilities Reference.
- SERVER
- The
dhcp.client
passes this environment variable to the
/etc/dhcp/dhcp-up script.
It indicates the server's IP address.
- SERVER_ADMIN
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the contact information of the administrator of
Slinger specified by Slinger's -a option.
For more information, see
slinger
in the Utilities Reference.
- SERVER_NAME
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name of the computer where Slinger is running.
For more information, see
slinger
in the Utilities Reference.
- SERVER_PORT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the IP port that Slinger is answering on.
For more information, see
slinger
in the Utilities Reference.
- SERVER_PROTOCOL
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name and version of HTTP served on Slinger.
For more information, see
slinger
in the Utilities Reference.
- SERVER_ROOT
- Slinger sets this environment variable, for use by CGI scripts.
It indicates Slinger's current working directory.
For more information, see
slinger
in the Utilities Reference.
- SERVER_SOFTWARE
- Slinger sets this environment variable, for use by CGI scripts.
It indicates the name of the Slinger software.
For more information, see
slinger
in the Utilities Reference.
- SHELL
- The pathname of the command interpreter, or shell, that you want to use.
It's set by
login.
- SMICINCL
- A list of directories to search for MIB modules.
For more information, see
smic
in the Utilities Reference.
- SNMPCONFIGFILE
- The pathname of the
snmpd.conf
file.
- SOCKET
- The
pccard-launch
utility sets this environment variable to indicate
the socket where the card is inserted.
- SOCKS_NS
- The IP address of the domain nameserver that should be used for name
resolution by
rftp
and
rtelnet.
- SOCKS_SERVER
- The name or IP address of the SOCKS proxy server host to use, overriding
the default server compiled into
rftp
and
rtelnet.
- SUFFIX
- If this environment variable exists, the SNMP utilities print only the
last element of all object IDs with a symbolic name.
For more information, see
snmpget
in the Utilities Reference.
- SYSLOG
- The node on which
syslogd
is running.
- SYSNAME
- The name of the system.
- TERM
- The terminal type.
- TERMINFO
- The name of the directory for terminfo files; see
tic
in the Utilities Reference.
- TMPDIR
- The name of a directory where utilities can create temporary files.
- TZ
- The timezone definition; see
“Setting the time zone”
in the Configuring Your Environment chapter of the
Neutrino User's Guide.
- USER
- The userid you used to login; the same as LOGNAME.
- USER_NAME
- Internal use only.
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