multi: remove redundant condition in curl_multi_wait #1439
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`if(nfds || extra_nfds) {` is followed by `malloc(nfds * ...)`.
If `extra_fs` could be non-zero when `nfds` was zero, then we have `malloc(0)` which is allowed to return `NULL`. But, malloc returning NULL can be confusing. In this code, the next line would treat the NULL as an allocation failure.
It turns out, if `nfds` is zero then `extra_nfds` must also be zero. The final value of `nfds` includes `extra_nfds`. So the test for `extra_nfds` is redundant. It can only confuse the reader.
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@sourcejedi, thanks for your PR! By analyzing the history of the files in this pull request, we identified @bagder, @yangtse and @linusnielsen to be potential reviewers. |
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Thanks! |
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if(nfds || extra_nfds) {is followed bymalloc(nfds * ...).If
extra_fscould be non-zero whennfdswas zero, then we havemalloc(0)which is allowed to returnNULL. malloc returning NULL for success is a troublesome edge case. In this code, the next line would treat the NULL as an allocation failure.It turns out, if
nfdsis zero thenextra_nfdsmust also be zero. The final value ofnfdsincludesextra_nfds. So the test forextra_nfdsis redundant. It can only confuse the reader.