DragonFly On-Line Manual Pages
GETCONF(1) DragonFly General Commands Manual GETCONF(1)
getconf -- retrieve standard configuration variables
getconf [-v environment] path_var file
getconf [-v environment] system_var
The getconf utility prints the value of a POSIX or X/Open path or system
configuration variable to the standard output. If the specified variable
is undefined, the string ``undefined'' is output.
The first form of the command, with two mandatory arguments, retrieves
file- and file system-specific configuration variables using pathconf(2).
The second form, with a single argument, retrieves system configuration
variables using confstr(3) and sysconf(3), depending on the type of
variable. As an extension, the second form can also be used to query
static limits from <limits.h>.
All sysconf(3) and pathconf(2) variables use the same name as the
manifest constants defined in the relevant standard C-language bindings,
including any leading underscore or prefix. That is to say, system_var
might be ARG_MAX or _POSIX_VERSION, as opposed to the sysconf(3) names
_SC_ARG_MAX or _SC_VERSION. Variables retrieved from confstr(3) have the
leading `_CS_' stripped off; thus, _CS_PATH is queried by a system_var of
The -v environment option specifies a IEEE Std 1003.1-2001 (``POSIX.1'')
programming environment under which the values are to be queried. This
option currently does nothing, but may in the future be used to select
between 32-bit and 64-bit execution environments on platforms which
support both. Specifying an environment which is not supported on the
current execution platform gives undefined results.
The standard programming environments are as follows:
POSIX_V7_ILP32_OFF32 Exactly 32-bit integer, long, pointer, and
file offset. Supported platforms: None.
POSIX_V7_ILP32_OFFBIG Exactly 32-bit integer, long, and pointer;
at least 64-bit file offset. Supported
POSIX_V7_LP64_OFF64 Exactly 32-bit integer; exactly 64-bit long,
pointer, and file offset. Supported
POSIX_V7_LPBIG_OFFBIG At least 32-bit integer; at least 64-bit
long, pointer, and file offset. Supported
returns a newline-separated list of environments in which the width of
certain fundamental types is no greater than the width of the native C
type long. At present, all programming environments supported by
DragonFly have this property. Several of the confstr(3) variables
provide information on the necessary compiler and linker flags to use the
standard programming environments described above.
The getconf utility exits 0 on success, and >0 if an error occurs.
will display the system default setting for the PATH environment
getconf NAME_MAX /tmp
will display the maximum length of a filename in the /tmp directory.
getconf -v _POSIX_V7_LPBIG_OFFBIG LONG_MAX
will display the maximum value of the C type long in the
POSIX_V7_LPBIG_OFFBIG programming environment, if the system supports
Use of a system_var or path_var which is completely unrecognized is
considered an error, causing a diagnostic message to be written to
standard error. One which is known but merely undefined does not result
in an error indication. The getconf utility recognizes all of the
variables defined for IEEE Std 1003.1-2001 (``POSIX.1''), including those
which are not currently implemented.
pathconf(2), confstr(3), sysconf(3)
The getconf utility is expected to be compliant with IEEE Std 1003.1-2001
The getconf utility first appeared in FreeBSD 5.0.
Garrett A. Wollman <email@example.com>
DragonFly 4.3 October 18, 2015 DragonFly 4.3