In my program, I need to check the completion of a sendfile() operation in a non-blocking socket. How can that be done?
After checking the documentation and searching on internet, I couldn’t find out how to do it
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In my program, I need to check the completion of a sendfile() operation in a non-blocking socket. How can that be done?
After checking the documentation and searching on internet, I couldn’t find out how to do it
It works very similarly to
send(): if the socket is set asO_NONBLOCKand the operation would block,sendfile()returns immediately and setserrnotoEAGAIN. In this case you have to wait a while and then try again (maybe using a function likeselect()to know when it’s ready).Also keep in mind that even if it succeeds it may not write all the bytes you requested in a single function call. Always check the return value:
You can also take a look at the man page for sendfile()