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You can also import the information from an external command by appending a pipe symbol (|):
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INIT: The INIT: keyword allows you to insert initialization code before the destination function is called This can be used for initializing variables, allocating
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Note that you place a conditional statement after the CASE: keyword to act as the matching value; the last CASE: becomes the default if you do not specify a conditional statement
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memory, or inserting debugging statements Unlike when using CODE:, RETVAL works as you expect This keyword causes the input parameters to be evaluated later than normal within the function initialization This is usually used in conjunction with the PREINIT: keyword and may be included multiple times within the XSUB definition
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INTERFACE: The INTERFACE: keyword allows you to define a mapping for a number of functions simultaneously For example, when developing an interface to a suite of functions that all have the same argument list such as sin, cos, and tan you could define them as
float interface_s(value) float value INTERFACE: sin cos tan
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INTERFACE_MACRO: This keyword allows you to define an INTERFACE (as defined earlier in the chapter) using a predefined macro to extract a function pointer for the XSUB definition The text following this function should be the names of the preprocessor macros that would extract and set a function pointer The default macros (used if you don t explicitly specify them) are XSINTERFACE_FUNC and XSINTERFACE_FUNC_SET The extractor macro is given the return type, the CV* code value pointer, and the XSANYany_dptr pointer for the CV* The macro for setting the function is given cv (the code value) and the pointer to the correct function MODULE
The MODULE keyword starts the XS definition section of the XS file:
MODULE = StatVFS
Everything before the MODULE keyword is taken as raw C code to be passed on to the C file created by xsubpp The name specified will be used as the basis of the bootstrap function that will form the interface between Perl and the C functions It will also be the name of the package that will use the function unless you specify differently with the PACKAGE keyword This keyword indicates that a function parameter is being used only as an output value, as in the case of a passed parameter being populated by the function and
NO_INIT
Perl: The Complete Reference
then used as the return value This option prevents Perl from taking all the arguments from the argument stack and assigning them to C variables upon entry For example:
bool_t rpcb_gettime(host, timep) char *host; time_t &timep = NO_INIT OUTPUT: timep
OUTPUT: The OUTPUT: keyword indicates that a particular value within the function arguments has been updated, and the new values should be made available to Perl when the function terminates This is useful for functions when you are passing the address of a structure to the C function The C function updates the contents of the array or structure directly, but may actually return an unrelated value (usually an error code) By defining the passed variable or structure as the OUTPUT: value, Perl knows this is the information to return to the calling Perl script You should also use this keyword when it is unclear what value Perl should be returning When you use a CODE: block, the RETVAL variable is not recognized as an output variable, and you would need to pass RETVAL to the OUTPUT: keyword to ensure that the XS interface returns the correct information Finally, an OUTPUT: keyword can be used to create an in-line typemap; so the output parameter can be mapped to a particular piece of code, just as it would in the standard typemap PACKAGE
You can specify an alternative package name or the specific package name if it s part of a package hierarchy, using the PACKAGE keyword:
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