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sysconf(3)							    sysconf(3)

NAME
       sysconf - Get configurable system variables

SYNOPSIS
       #include <unistd.h>

       long sysconf(
	       int name );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:

       sysconf():  POSIX.1c, XSH4.2

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

PARAMETERS
       Specifies the system variable to be queried.

DESCRIPTION
       The  sysconf() function provides a method for the application to deter‐
       mine the current value  of  a  configurable  system  limit  or  whether
       optional features are supported.

       The  following  is  a list of system variables that are returned by the
       sysconf() function, and the symbolic constants (shown  in  parentheses)
       that  are  the  corresponding  values  used for the name parameter. The
       variables come from either  the	limits.h,  unistd.h,  or  time.h  (for
       CLK_TCK)	 header	 file  and  the	 symbolic  constants  are  defined  in
       unistd.h.

       [Tru64 UNIX]  Integer value indicating the revision of the AES to which
       the  implementation  is	compliant.   Maximum  length, in bytes, of the
       arguments for one of the exec functions,	 including  environment	 data.
       [XSH4.2]	 Maximum  number  of  functions	 that  can  be registered with
       atexit() per process. (_SC_ATEXIT_MAX) Maximum value  allowed  for  the
       obase variable with the bc command.  Maximum number of elements permit‐
       ted in an array by the bc command.  Maximum value allowed for the scale
       variable	 with  the  bc	command.   Maximum  length of string constants
       accepted by the bc command.  Maximum number of  simultaneous  processes
       for  each real user ID.	Number of clock ticks per second. The value of
       CLK_TCK may be variable, and it should not be assumed that CLK_TCK is a
       compile-time  constant.	Maximum number of weights that can be assigned
       to an entry in the LC_COLLATE locale-dependent information in a locale-
       definition file Maximum number of expressions that can be nested within
       parentheses by the expr command.	  [XSH4.2]  Maximum  number  of	 iovec
       structures  that	 one  process  has  available  for use with readv() or
       writev().  Maximum length, in bytes, of a command's input line  (either
       standard	 input	or another file) when the utility is described as pro‐
       cessing text files. The length includes room for the  trailing  newline
       character.   Maximum number of simultaneous supplementary group IDs for
       each process.  Maximum number of files that one process can  have  open
       at one time.

	      [Tru64  UNIX]  In	 some  cases,  the per-process soft descriptor
	      limit is returned instead of the OPEN_MAX value.	[XSH4.2]  Page
	      size granularity for memory regions.  [XSH4.2]  Page size granu‐
	      larity  for  memory  regions.   Maximum  number  of   characters
	      returned by getpass(), (not including the terminating null char‐
	      acter).  The variable has a value of 1 if	 the  system  supports
	      job  control;  otherwise, -1 is returned.	 [POSIX]  The variable
	      has a value of 1 if the system supports  POSIX  reentrant	 func‐
	      tions; otherwise, -1 is returned.	 The variable has a value of 1
	      if each process has a saved set user ID and a  saved  set	 group
	      ID;  otherwise,  -1  is  returned.   [POSIX]  The variable has a
	      value of 1 if the system supports the  POSIX.1  Threads  option;
	      otherwise, -1 is returned.  [POSIX]  The variable has a value of
	      1	 if  the  system  supports  the	 POSIX.1  Threads  Stack  Size
	      attribute	 option;  otherwise, -1 is returned.  Date of approval
	      of the most current version of the POSIX	1  standard  that  the
	      system  supports. The date is a 6-digit number, with the first 4
	      digits signifying the year and the last 2 digits the month. Dif‐
	      ferent  versions	of  the	 POSIX	1  standard  are  periodically
	      approved by the IEEE Standards Board, and the date  of  approval
	      is   used	  to   distinguish  between  different	versions.   If
	      _POSIX_VERSION is defined, it  is	 returned;  otherwise,	-1  is
	      returned.	  The variable has a value of 1 if the system supports
	      the C language binding from POSIX 2; otherwise, -1 is  returned.
	      The  variable  has  a  value  of	1  if  the system supports the
	      optional C Language Development Utilities from POSIX  2;	other‐
	      wise, -1 is returned.  Date of approval of the most current ver‐
	      sion of the POSIX 2 ISO C standard that the system supports. The
	      date is a 6-digit number, with the first 4 digits signifying the
	      year and the last 2 digits the month. Different versions of  the
	      POSIX  2	ISO  C	standard are periodically approved by the IEEE
	      Standards Board, and the date of approval is used to distinguish
	      between  different  versions.   The variable has a value of 1 if
	      the system supports at  least  one  terminal;  otherwise	-1  is
	      returned.	  The variable has a value of 1 if the system supports
	      the FORTRAN Development Utilities Option from  POSIX  2;	other‐
	      wise, -1 is returned.  The variable has a value of 1 if the sys‐
	      tem supports the FORTRAN Runtime Utilities Option from POSIX  2;
	      otherwise, -1 is returned.  The variable has a value of 1 if the
	      system supports the creation of new locales with	the  localedef
	      command; otherwise, -1 is returned.  The variable has a value of
	      1 if the system  supports	 the  Software	Development  Utilities
	      Option  from  POSIX  2; otherwise, -1 is returned.  The variable
	      has a value of 1 if the system  supports	the  User  Portability
	      Environment  Option  from	 POSIX	2;  otherwise, -1 is returned.
	      Date of approval of the most current  version  of	 the  POSIX  2
	      standard that the system supports. The date is a 6-digit number,
	      with the first 4 digits signifying the year and the last 2  dig‐
	      its  the	month.	Different versions of the POSIX 2 standard are
	      periodically approved by the IEEE Standards Board, and the  date
	      of  approval  is used to distinguish between different versions.
	      Maximum number of repeated occurrences of a  regular  expression
	      permitted	 when  using the interval-notation parameters, such as
	      the m and n parameters with the  ed  command.   [POSIX]  Maximum
	      number	of    outstanding    asynchronous    I/O   operations.
	      [POSIX]  Maximum number of I/O operations in a single  list  I/O
	      call.  [POSIX]  The variable has a value of 1 if the system sup‐
	      ports the POSIX Asynchronous Input and Output option;  otherwise
	      -1  is  returned.	  [POSIX]  Maximum  number of timer expiration
	      overruns.	 [POSIX]  The variable has a value of 1 if the	system
	      supports	the  POSIX.1 File Synchronization option; otherwise -1
	      is returned.  [POSIX]  Maximum size of  data  buffers  for  get‐
	      grgid_r and getgrnam_r functions.	 [POSIX]  Maximum size of data
	      buffers for getpwuid_r and getpwnam_r functions.	[POSIX]	 Maxi‐
	      mum  number  of  I/O operations in a single list I/O call. Avoid
	      using _SC_LISTIO_AIO_MAX, which is only  retained	 for  backward
	      compatibility.  Use  only	 the CAE-UNIX98-compliant _SC_AIO_LIS‐
	      TIO_MAX operation.  Size in bytes	 of  storage  required	for  a
	      login   name,   including	  the	terminating   null  character.
	      [POSIX]  The variable has a value of 1 if	 the  system  supports
	      the   POSIX.1  Memory  Mapped  Files  option;  otherwise	-1  is
	      returned.	 [POSIX]  The variable has a value of 1 if the	system
	      supports the POSIX.1 Process Memory Locking option; otherwise -1
	      is returned.  [POSIX]  The variable has a value of 1 if the sys‐
	      tem  supports the POSIX.1 Range Memory Locking option; otherwise
	      -1 is returned.  [POSIX]	The variable has a value of 1  if  the
	      system  supports the POSIX.1 Memory Protection option; otherwise
	      -1 is returned.  [POSIX]	The variable has a value of 1  if  the
	      system supports the POSIX.1 Message Passing option; otherwise -1
	      is returned.  [POSIX]  Maximum  number  of  open	message	 queue
	      descriptors a process may hold.  [POSIX]	Maximum number of mes‐
	      sage priorities.	[POSIX]	 The variable has a value of 1 if  the
	      system supports the POSIX.1 Prioritized Input and Output option;
	      otherwise -1 is returned.	 [POSIX]  The variable has a value  of
	      1	 if the system supports the POSIX.1 Process Scheduling option;
	      otherwise -1 is returned.	 [POSIX]  The variable has a value  of
	      1	 if the system supports the POSIX.1 Realtime Signals Extension
	      option; otherwise -1 is returned.	  [POSIX]  Maximum  number  of
	      realtime	signals	 reserved  for	application use.  [POSIX]  The
	      variable has a value of 1 if the	system	supports  the  POSIX.1
	      Shared   Memory	Objects	 option;  otherwise  -1	 is  returned.
	      [POSIX]  The variable has a value of 1 if	 the  system  supports
	      the   POSIX.1  Semaphores	 option;  otherwise  -1	 is  returned.
	      [POSIX]  Maximum number of semaphores that a process  may	 have.
	      [POSIX]  Maximum	value  a semaphore can have.  [POSIX]  Maximum
	      number of queued signals that a process may send and have	 pend‐
	      ing at the receiver(s) at any time.  [POSIX]  The variable has a
	      value of 1 if the system supports the POSIX.1 Synchronized Input
	      and Output option; otherwise -1 is returned.  [POSIX]  The vari‐
	      able has a value of 1 if the system supports the POSIX.1	Thread
	      Stack  Address  Attribute	 option;  otherwise  -1	 is  returned.
	      [POSIX]  Maximum number of attempts made to destroy  a  thread's
	      thread-specific  data  values  on thread exit.  [POSIX]  Maximum
	      number  of  data	keys  that   can   be	created	  per-process.
	      [POSIX]  The  variable  has  a value of 1 if the system supports
	      the  POSIX.1  Priority  Inheritance  option;  otherwise  -1   is
	      returned.	  [POSIX]  The variable has a value of 1 if the system
	      supports the POSIX.1 Priority Protection option; otherwise -1 is
	      returned.	  [POSIX]  The variable has a value of 1 if the system
	      supports the POSIX.1 Thread Execution Scheduling option;	other‐
	      wise  -1 is returned.  [POSIX]  The variable has a value of 1 if
	      the system supports the POSIX.1  Process-Shared  Synchronization
	      option;  otherwise  -1 is returned.  [POSIX]  The variable has a
	      value of 1 if the system supports the POSIX.1 Thread-Safe	 Func‐
	      tions  option;  otherwise -1 is returned.	 [POSIX]  Minimum size
	      in bytes of thread stack storage.	  [POSIX]  Maximum  number  of
	      threads  that can be created per process.	 [POSIX]  Maximum num‐
	      ber of timers per process.  [POSIX]  The variable has a value of
	      1 if the system supports the POSIX.1 Timers option; otherwise -1
	      is returned.  Maximum length of terminal device name.  Number of
	      streams  that  one  process  can have open at one time.  Maximum
	      number of bytes supported for the name of a time zone  (not  the
	      length  of  the  TZ environmental variable).  The variable has a
	      value of 1 if the system supports the X/Open Encryption  Feature
	      Group; otherwise, -1 is returned.	 The variable has a value of 1
	      if the system supports the X/Open Enhanced  Internationalization
	      Feature  Group;  otherwise,  -1 is returned.  The variable has a
	      value of 1 if the system supports the X/Open Shared Memory  Fea‐
	      ture  Group;  otherwise, -1 is returned.	[XSH4.2]  The variable
	      has a value of 1 if the system supports the X/Open UNIX  Feature
	      Group;  otherwise,  -1 is returned.  Integer indicating the most
	      current version of the X/Open standard that the system supports.
	      Integer  indicating the most current version of the X/Open stan‐
	      dard for Commands and Utilities that the system supports.

       [Tru64 UNIX]  The following values of name are supported as part of the
       System  V Environment for compliance with the System V Release 4.0 with
       Multiprocessing (SVR4.0MP) standards: Number of processors in the  sys‐
       tem.  Number of processors currently online.

RETURN VALUES
       If  the	name  parameter	 is  an	 invalid value, the sysconf() function
       returns a value of -1, and sets errno to indicate  the  error.  If  the
       variable	 corresponding	to  name  is undefined, the sysconf() function
       returns a value of -1 without changing the value of errno.

ERRORS
       If the following condition occurs, the sysconf() function sets errno to
       the corresponding value: The value of the name parameter is invalid.

SEE ALSO
       Functions: pathconf(2)

       Commands: getconf(1)

       Standards: standards(5)

								    sysconf(3)
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