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by habibur 1262 days ago
Searched nginx source. Seems like it's using aio_read() aio_write()

./src/os/unix/ngx_file_aio_read.c

API's doc https://man7.org/linux/man-pages/man3/aio_read.3.html

Even though the source is there don't mean it's compiled or used though. Might or might not be. No idea about the details.