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TEMP_FAILURE_RETRY and __USE_GNU

I'm on Ubuntu 10.04 using GCC and I want to use the TEMP_FAILURE_RETRY macro as described here:

http://www.gnu.org/s/hello/manual/libc/Interrupted-Primitives.html

However, when compiling, I received the following error:

undefined reference to `TEMP_FAILURE_RETRY'

I looked in unistd.h where the macro is defined and preceded by:

#ifdef __USE_GNU

How do I get my code to compile and use this macro? Is it possible to just wrap it with the same #ifdef __USE_GNU in my code?

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2 answers

__USE_GNU is an internal macro, so you should not define it yourself.

But you can define _GNU_SOURCEeither in your code or during compilation (using the parameter -D).

, TEMP_FAILURE_RETRY .

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_GNU_SOURCE , TEMP_FAILURE_RETRY. TEMP_FAILURE_RETRY, , C, GNU:

#define CALL_RETRY(retvar, expression) do { \
    retvar = (expression); \
} while (retvar == -1 && errno == EINTR);

retvar , .

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