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Fix check for max_fd == -1 should actually be max_fd != -1
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@ -548,7 +548,7 @@ protected:
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if (select_timeout > 0) {
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if (select_timeout > 0) {
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// in Winsock it is forbidden to pass three empty
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// in Winsock it is forbidden to pass three empty
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// fd_sets to select(), so in that case use sleep_ms
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// fd_sets to select(), so in that case use sleep_ms
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if (max_fd == -1) {
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if (max_fd != -1) {
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select_tv.tv_sec = select_timeout / 1000;
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select_tv.tv_sec = select_timeout / 1000;
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select_tv.tv_usec = (select_timeout % 1000) * 1000;
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select_tv.tv_usec = (select_timeout % 1000) * 1000;
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int retval = select(max_fd + 1, &read_fd_set,
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int retval = select(max_fd + 1, &read_fd_set,
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