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Asked: 2026-06-13T19:16:56+00:00

I’m trying to compile some C code on Cygwin which needs the sendfile.h. When

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I’m trying to compile some C code on Cygwin which needs the sendfile.h. When I try to compile, it gives me 

fatal error: sys/sendfile.h: No such file or directory
compilation terminated.

How do I solve this? Will I have to move to a linux platform? I have gcc4.5 installed on Cygwin.

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1 Answer

  1. Editorial Team

    Like the comment mentioned, sendfile is not POSIX, however, from the man page of
    sendfile(2)

    sendfile() copies data between one file descriptor and another.
    Because this copying is done within the kernel, sendfile() is more
    efficient than the combination of read(2) and write(2), which would
    require transferring data to and from user space.

    Which means it’s basically a read() followed by a write(), so it would be relatively easy to implement it yourself.

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