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getconf (1)
  • getconf (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> getconf (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • getconf (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • getconf (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )

  • BSD mandoc
     

    NAME

    
    
    getconf
    
     - retrieve standard configuration variables
    
     
    

    SYNOPSIS

    [-v environment ] path_var file
    [-v environment ] system_var  

    DESCRIPTION

    The 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 In 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_POSIX_VERSION Variables retrieved from confstr(3) have the leading `_CS_' stripped off; thus, _CS_PATH is queried by a system_var of ``PATH ''  

    Programming Environments

    The -v environment option specifies a St -p1003.1-2001 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_V6_ILP32_OFF32
    Exactly 32-bit integer, long, pointer, and file offset. Supported platforms None.
    POSIX_V6_ILP32_OFFBIG
    Exactly 32-bit integer, long, and pointer; at least 64-bit file offset. Supported platforms IA32 PowerPC
    POSIX_V6_LP64_OFF64
    Exactly 32-bit integer; exactly 64-bit long, pointer, and file offset. Supported platforms Alpha SPARC64
    POSIX_V6_LPBIG_OFFBIG
    At least 32-bit integer; at least 64-bit long, pointer, and file offset. Supported platforms None.

    The command:

    "getconf POSIX_V6_WIDTH_RESTRICTED_ENVS"

    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 Vt long . At present, all programming environments supported by Fx 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.  

    EXIT STATUS

    Ex -std  

    EXAMPLES

    The command:

    "getconf PATH"

    will display the system default setting for the PATH environment variable.

    The command:

    "getconf NAME_MAX /tmp"

    will display the maximum length of a filename in the /tmp directory.

    The command:

    "getconf -v POSIX_V6_LPBIG_OFFBIG LONG_MAX"

    will display the maximum value of the C type Vt long in the POSIX_V6_LPBIG_OFFBIG programming environment, if the system supports that environment.  

    DIAGNOSTICS

    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 utility recognizes all of the variables defined for St -p1003.1-2001 , including those which are not currently implemented.  

    SEE ALSO

    pathconf(2), confstr(3), sysconf(3)  

    STANDARDS

    The utility is expected to be compliant with St -p1003.1-2001 .  

    HISTORY

    The utility first appeared in Fx 5.0 .  

    AUTHORS

    An Garrett A. Wollman Aq wollman@lcs.mit.edu


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    Programming Environments
    EXIT STATUS
    EXAMPLES
    DIAGNOSTICS
    SEE ALSO
    STANDARDS
    HISTORY
    AUTHORS


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