Description:
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The C function sleep() is defined as:
unsigned int sleep(unsigned int seconds); 

In PHP it is defined as:
void sleep ( int seconds)

The Problem is when using a CLI with a signal handler sleep() ends immediately but doesn't return the unslept seconds, thus it's not possible to resleep.
Checked current CVS via cvs.php.net and there is still no return value. So it's not a documentation problem.

Reproduce code:
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php -r "var_dump(sleep(10));"

Expected result:
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int(0) or unslept seconds if a signal was handled

Actual result:
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NULL