Driverkit __Require macro

Question

Created Jul ’20

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Has anybody gotten the __Require macro to work in DriverKit? Both the 2019 and 2020 WWDC videos show it being used. When I use it, it ends up trying to printf to stderr, which is not defined. I am using the one in DriverKit20.0 SDK.

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Answer 1

harikvpy OP

Jul ’20

I couldn't even find the relevant header to include to get it. I had to declare it myself and include it in my sample code.

Code Block #define Require(assertion, exceptionLabel)                \
do                                   \
{                                    \
if ( builtin_expect(!(assertion), 0) )              \
{                                  \
goto exceptionLabel;                      \
}                                  \
} while ( 0 )
#define Require_Action(assertion, exceptionLabel, action)        \
do                                   \
{                                    \
if ( builtin_expect(!(assertion), 0) )              \
{                                  \
{                                \
action;                           \
}                                \
goto exceptionLabel;                      \
}                                  \
} while ( 0 )

0