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See GCC bug 69602: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69602 which emits the warning for (errno == EWOULDBLOCK || errno == EAGAIN) which is the correct way of handling errors as the value of EWOULDBLOCK and EAGAIN is implementation defined. Therefore introduce a new macro function PHP_IS_TRANSIENT_ERROR() which handles the case when EWOULDBLOCK and EAGAIN are identical. Thanks to @twose for the idea.