(libc.info)Argp Global Variables


Argp Global Variables
---------------------

   These variables make it easy for user programs to implement the
`--version' option and provide a bug-reporting address in the `--help'
output.  These are implemented in argp by default.

 - Variable: const char * argp_program_version
     If defined or set by the user program to a non-zero value, then a
     `--version' option is added when parsing with `argp_parse', which
     will print the `--version' string followed by a newline and exit.
     The exception to this is if the `ARGP_NO_EXIT' flag is used.

 - Variable: const char * argp_program_bug_address
     If defined or set by the user program to a non-zero value,
     `argp_program_bug_address' should point to a string that will be
     printed at the end of the standard output for the `--help' option,
     embedded in a sentence that says `Report bugs to ADDRESS.'.

 - Variable: argp_program_version_hook
     If defined or set by the user program to a non-zero value, a
     `--version' option is added when parsing with `arg_parse', which
     prints the program version and exits with a status of zero.  This
     is not the case if the `ARGP_NO_HELP' flag is used.  If the
     `ARGP_NO_EXIT' flag is set, the exit behavior of the program is
     suppressed or modified, as when the argp parser is going to be
     used by other programs.

     It should point to a function with this type of signature:

          void PRINT-VERSION (FILE *STREAM, struct argp_state *STATE)

     Note: Argp Parsing State, for an explanation of STATE.

     This variable takes precedence over `argp_program_version', and is
     useful if a program has version information not easily expressed
     in a simple string.

 - Variable: error_t argp_err_exit_status
     This is the exit status used when argp exits due to a parsing
     error.  If not defined or set by the user program, this defaults
     to: `EX_USAGE' from `<sysexits.h>'.


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