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Asked: 2026-05-22T12:39:37+00:00

From libssh2_channel_write_ex man page: Actual number of bytes written or negative on failure. LIBSSH2_ERROR_EAGAIN

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From libssh2_channel_write_ex man page:

Actual number of bytes written or
negative on failure.
LIBSSH2_ERROR_EAGAIN when it would
otherwise block. While
LIBSSH2_ERROR_EAGAIN is a negative
number, it isn’t really a failure per
se.

Now I have a problem with that. When I receive LIBSSH2_ERROR_EAGAIN does it mean that nothing was sent and that I must resend all data? Or does it mean that some data have been sent

My problem is that if I’m trying to send more data that the underlying socket can hold, write() should block anyway, henceforth how can I hope to send a big block of data without getting LIBSSH2_ERROR_EAGAIN every time?

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1 Answer

  1. Editorial Team

    LIBSSH2_ERROR_EAGAIN means nothing was sent and you must send it all again. If something was sent, that number would be returned instead.

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