getconf(C)
getconf --
print configuration dependent values
Syntax
getconf system_variable
getconf path_variable pathname
Description
The getconf command writes the value of configuration
dependent variables to standard output.
In the first syntax, getconf writes the value of the
variable specified by system_variable.
In the second syntax, getconf writes the value of the
variable specified by path_variable for the specified
pathname.
If system_variable or path_variable is a legal
variable, but is not defined on the current system or in
pathname, getconf will display:
undefined
The following variables are recognized as system
variables:
ARG_MAX-
Maximum length of an argument. The minimum length is defined by
{POSIX_ARG_MAX} (see below).
BC_BASE_MAX-
Maximum obase values as permitted by the bc
command. The minimum value is defined by
{POSIX2_BC_BASE_MAX} (see below).
BC_DIM_MAX-
Maximum number of array elements permitted by bc. The
minimum number is defined by {POSIX2_BC_DIM_MAX} (see
below).
BC_SCALE_MAX-
Maximum value of scale allowed by bc. The
minimum value is defined by {POSIX2_BC_SCALE_MAX} (see
below).
BC_STRING_MAX-
Maximum length of a string constant accepted by bc. The
minimum length is defined by {POSIX2_BC_STRING_MAX} (see
below).
CHARCLASS_NAME_MAX-
Maximum number of bytes in a character class name.
CHAR_BIT-
The number of bits in a type char variable.
CHAR_MAX-
The highest possible value of a type char variable.
CHAR_MIN-
The minimum possible value of a type char variable.
CHILD_MAX-
Maximum number of simultaneous processes per real user ID.
The minimum number is defined by {POSIX_CHILD_MAX} (see
below).
CLK_TCK-
Number of clock ticks per second.
COLL_WEIGHTS_MAX-
Maximum number of weights that can be assigned to
LC_COLLATE variable. The minimum number is defined by
{POSIX2_COLL_WEIGHTS_MAX} (see below).
CS_PATH-
The value of the PATH environment variable.
EXPR_NEST_MAX-
The maximum number of expressions that can be nested within
parentheses by the
expr(C)
command. The minimum number is defined by
{POSIX2_EXPR_NEST_MAX} (see below).
INT_MAX-
Maximum value of a type int variable.
INT_MIN-
Minimum value of a type int variable.
IOV_MAX-
Maximum number of iovec structures that can be used by
readv(S)
and
writev(S)
system calls.
KERNEL_CLISTS-
Number of clists allocated.
KERNEL_CLISTS_MAX-
Maximum number of clists.
KERNEL_DISK-
Number of disk drives supported.
KERNEL_DISK_MAX-
Maximum number of disk drives that can be supported.
KERNEL_FILE-
Size of file table.
KERNEL_FILE_MAX-
Maximum size of file table.
KERNEL_FLCKREC-
Number of record locks.
KERNEL_FLCKREC_MAX-
Maximum number of record locks.
KERNEL_INODE-
Size of inode table.
KERNEL_INODE_MAX-
Maximum size of inode table.
KERNEL_MOUNT-
Size of mount table.
KERNEL_MOUNT_MAX-
Maximum size of mount table.
KERNEL_PINODE-
Size of High Performance Pipe System (HPPS) inode table.
KERNEL_PINODE_MAX-
Maximum size of High Performance Pipe System (HPPS) inode
table.
KERNEL_PROC-
Size of process table.
KERNEL_PROC_MAX-
Maximum size of process table.
KERNEL_REGION-
Size of region table.
KERNEL_REGION_MAX-
Maximum size of region table.
KERNEL_S5INODE-
Size of s5inode table.
KERNEL_S5INODE_MAX-
Maximum size of s5inode table.
LINE_MAX-
The default maximum length, in bytes, of a command's input line. The
length includes the trailing newline.
LONG_BIT-
Set to the number of bits in a variable of type long int.
LONG_MAX-
Set to the maximum number of bits in a variable of type long
int.
LONG_MIN-
Set to the minimum number of bits in a variable of type long
int.
MB_LEN_MAX-
Maximum number of bytes in a character, for any supported locale.
NGROUPS_MAX-
This is the maximum number of simultaneous supplementary group
IDs available to a process. The minimum number is defined
by {POSIX_NGROUPS_MAX} (see below).
NL_ARGMAX-
This is the maximum value of the variable digit as passed
to the
printf(S)
and
scanf(S)
functions.
NL_LANGMAX-
This is the maximum number of permissible bytes in a LANG
name.
NL_MSGMAX-
Set to the maximum number of a message.
NL_NMAX-
This is set to the maximum number of permissible bytes in an N-to-1
collation mapping.
NL_SETMAX-
The maximum set number.
NL_TEXTMAX-
This is set to the maximum number of allowable bytes in a message
string.
NZERO-
This is the default process priority.
OPEN_MAX-
The maximum number of per-process open files. The minimum number is
defined by {POSIX_OPEN_MAX} (see below).
PASS_MAX-
The maximum number of significant bytes in a
PATH-
The path through which the shell searches for a specified command.
_POSIX_ARG_MAX-
Maximum length of an argument, including environment data, to the
exec(S)
function, and the minimum value to which {ARG_MAX} can be
set.
_POSIX_CHILD_MAX-
Maximum number of simultaneous processes per real user ID,
and the minimum value to which {CHILD_MAX} can be set.
_POSIX_JOB_CONTROL-
If set to a value other than -1, the implementation supports job
control.
_POSIX_LINK_MAX-
Maximum number of permitted links to a single file, and the minimum
value to which {LINK_MAX} can be set.
_POSIX_MAX_CANON-
Maximum number of permitted bytes in a terminal canonical input
queue, and the minimum value to which {MAX_CANON} can be
set.
_POSIX_MAX_INPUT-
Maximum number of permitted bytes in a terminal input queue. The
minimum value to which {MAX_INPUT} can be set.
_POSIX_NAME_MAX-
Maximum length (in bytes) of a filename, excluding terminating null,
and the minimum value to which {NAME_MAX} can be set.
_POSIX_NGROUPS_MAX-
Maximum number of simultaneous supplementary group IDs per
process, and the minimum value to which {NGROUPS_MAX} can
be set.
_POSIX_OPEN_MAX-
Maximum number of per-process open files that can be simultaneously
open, and the minimum value to which {OPEN_MAX} can be
set.
_POSIX_PATH_MAX-
Maximum length (in bytes) of a pathname, and the minimum value to
which {PATH_MAX} can be set.
_POSIX_PIPE_BUF-
Maximum number of bytes guaranteed to be atomic when writing to a
pipe, and the minimum value to which {PIPE_BUF} can be
set.
_POSIX_SAVED_IDS-
If this constant is defined with a value other than -1, each process
has a saved user-ID and a saved set-group ID.
_POSIX_SSIZE_MAX-
Set to the value that can be stored in an object of size
size_t, and the minimum value to which
{SSIZE_MAX} can be set.
_POSIX_STREAM_MAX-
The maximum number of streams that a single process can have open at
any one time, and the minimum value to which {STREAM_MAX}
can be set.
_POSIX_TZNAME_MAX-
The maximum number of bytes that can make up the name of a timezone,
and the minimum value to which {TZNAME_MAX} can be set.
_POSIX_VERSION-
Integer value indicating the version of the IEEE POSIX
standard supported.
POSIX2_BC_BASE_MAX-
Maximum obase values as permitted by the bc
command, and the minimum value to which {BC_BASE_MAX} can
be set.
POSIX2_BC_DIM_MAX-
Maximum number of array elements permitted by bc, and the
minimum value to which {BC_DIM_MAX} can be set.
POSIX2_BC_SCALE_MAX-
Maximum value of scale allowed by bc, and the
minimum value to which {BC_SCALE_MAX} can be set.
POSIX2_BC_STRING_MAX-
Maximum length of a string constant accepted by bc, and
the minimum value to which {BC_STRING_MAX} can be set.
POSIX2_C_BIND-
A figure other than -1 indicates support for the C language.
POSIX2_C_DEV-
A figure other than -1 indicates support for the C language
development utilities.
POSIX2_C_VERSION-
Value indicating the version of the IEEE POSIX.2 standard
supported by the implementation. It also indicates whether the
X/Open POSIX2 C-language binding feature group is
supported.
POSIX2_CHAR_TERM-
Indicates whether the system supports at least one terminal
type. Set to -1 if it does not, otherwise set to a value other than
-1.
POSIX2_COLL_WEIGHTS_MAX-
Maximum number of weights that can be assigned to the
LC_COLLATE variable, and the minimum value to which
{COLL_WEIGHTS_MAX} can be set.
POSIX2_EXPR_NEST_MAX-
The maximum number of expressions that can be nested within
parentheses by the
expr(C)
command, and the minimum value to which {EXPR_NESTS_MAX}
can be set.
POSIX2_FORT_DEV-
If set to a value other than -1, the implementation supports the
FORTRAN development utilities option.
POSIX2_FORT_RUN-
If set to a value other than -1, the implementation supports the
FORTRAN run-time utilities option.
POSIX2_LINE_MAX-
The default maximum length, in bytes, of a command's input line. The
length includes the trailing newline.
POSIX2_LOCALEDEF-
If set to a value other than -1, the implementation supports the
localedef(C)
utility.
POSIX2_RE_DUP_MAX-
This is the maximum number of permitted repetitions of a regular
expression when using the interval notation \f{m,n\f}.
POSIX2_SW_DEV-
If set to a value other than -1, the implementation supports the
software development utilities option.
POSIX2_UPE-
If set to a value other than -1, the implementation supports the
user portability utilities extension (UPE) option.
POSIX2_VERSION-
Value indicating the version of the IEEE POSIX.2 standard
supported by the implementation.
RE_DUP_MAX-
This is the maximum number of permitted repetitions of a regular
expression when using the interval notation \f{m,n\f}.
SCHAR_MAX-
Maximum value of a variable of type signed char.
SCHAR_MIN-
Minimum value of a variable of type signed char.
SHRT_MAX-
Maximum value of a variable of type short.
SHRT_MIN-
Minimum value of a variable of type short.
SSIZE_MAX-
Maximum value of an object of type ssize_t. The minimum
length is defined by {POSIX_SSIZE_MAX} (see above).
STREAM_MAX-
The number of streams that any one process can have open at one
time. If defined, this value is the same as {FOPEN_MAX} as
defined in <stdio.h>. The minimum length is defined by
{POSIX_STREAM_MAX} (see above).
TMP_MAX-
The minimum number of unique pathnames that can be generated by
tmpnam(S).
Also the maximum number of times that an application can reliably
call tmpnam.
TZNAME_MAX-
The name of a time-zone can consist of this maximum number of bytes
(this is not the TZ variable. The minimum length is
defined by {POSIX_TZNAME_MAX} (see above).
UCHAR_MAX-
Maximum value of a variable of type unsigned char.
UINT_MAX-
Maximum value of a variable of type unsigned int.
ULONG_MAX-
Maximum value of a variable of type unsigned long int.
USHRT_MAX-
Maximum value of a variable of type unsigned short int.
WORD_BIT-
The number of bits in a word or a variable of type int.
_XOPEN_VERSION-
This value indicates the version of the X/Open specification to
which this implementation conforms.
_XOPEN_XCU_VERSION-
This integer value indicates the version of the X/Open commands and
utilities specification (XCU) to which this implementation
conforms. If the value is -1, no commands or utilities are provided
on the implementation. If the value is greater than or equal to 4,
the functionality defined by the following symbols is supported:
{POSIX2_C_BIND}
{POSIX2_C_VERSION}
{POSIX2_CHAR_TERM}
{POSIX2_LOCALEDEF}
{POSIX2_UPE}
{POSIX2_VERSION}
_XOPEN_CRYPT-
If defined, the implementation supports the X/Open Encryption
Feature Group.
_XOPEN_ENH_I18N-
If defined, the implementation supports the X/Open Enhanced
Internationalization (I18N) Feature Group.
_XOPEN_SHM-
If defined, the implementation supports the X/Open Shared Memory
Feature Group.
_XOPEN_XPG2-
If defined, this implementation supports the X/Open Portability
Guide, Version 2; Volume 2, XVS System Calls and
Libraries, January 1987, ISBN 0-444-70174-5.
_XOPEN_XPG3-
If defined, this implementation supports the X/Open Portability
Guide, Version 3; Volume 2, XSI System
Interfaces and Headers, December 1988, ISBN
0-13-685843-0.
_XOPEN_XPG4-
If defined, this implementation supports X/Open CAE Specification, System Interfaces and Headers, Issue 4, 1992, July 1992,
ISBN 1-872630-47-2.
The following variables are recognized as path variables
(they depend on a pathname):
LINK_MAX-
This is the maximum number of permissible links to a single
file. The minimum length is defined by {POSIX_LINK_MAX}.
MAX_CANON-
Maximum number of permitted bytes in a terminal canonical input
queue. The minimum length is defined by {POSIX_MAX_CANON}.
MAX_INPUT-
Maximum number of permitted bytes in a terminal input queue. The
minimum length is defined by {POSIX_MAX_INPUT}.
NAME_MAX-
Maximum length (in bytes) of a filename, excluding terminating
null. The minimum length is defined by {POSIX_NAME_MAX}.
PATH_MAX-
Maximum length (in bytes) of a pathname. The minimum length is
defined by {POSIX_PATH_MAX}.
PIPE_BUF-
Maximum number of bytes guaranteed to be atomic when writing to a
pipe. The minimum length is defined by {POSIX_PIPE_BUF}.
_POSIX_CHOWN_RESTRICTED-
If this is defined with a value other than -1, the
chown(S)
routine can only be executed by a process with appropriate
privileges. In addition, the use of chown is restricted to
the ability to change the group ID of a file to the
effective group ID of the process or to one of its
supplementary group ID.
_POSIX_NO_TRUNC-
If this is set to a value other than -1, a pathname component longer
than {NAME_MAX} will generate an error.
_POSIX_VDISABLE-
If this value is set to -1, terminal special characters defined in
<termio.h> will be disabled.
Exit values
getconf returns 0 (zero) if the specified variable exists
or is undefined; a positive non-zero value is returned if the
variable is invalid or an error occurs.
Examples
Entering the command getconf KERNEL_PROC will
return the current size of the dynamic process table.
Limitations
The inclusion of a variable in one of the above tables does not
imply that its value can be altered by reconfiguring the system;
some of the values are fixed.
See also
confstr(S),
pathconf(S),
readv(S),
setconf(ADM),
sysconf(S),
writev(S)
Standards conformance
getconf is conformant with:
ISO/IEC DIS 99452:1992, Information technology Portable Operating System Interface (POSIX) Part 2: Shell and Utilities (IEEE Std 1003.21992);
X/Open CAE Specification, Commands and Utilities, Issue 4, 1992.
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