Re: Problem with large write buffer

On Tue, 12 May 2009, Daniele Pianu wrote:

> I'm working on a strem library which implements various kind of streams. All
> SSH based streams are implemented using your great libssh2 library ;) Now
> I'm trying to implement the SFTP protocol, but I've some problem when
> uploading large files. This example partially reproduces the problem:

When I run the app with strace, the last lines are telling:

send(4,
"\347\214T\272u\335\213]\306\276\310\344K\353\360\25\273\310+\377;|D\244\371\352i\310\273FKO"...,
32820, MSG_NOSIGNAL) = 32820
send(4, "\270U'3\303\220\3257nu6\330\337\3r\373\351\314J\307\352<\220
\212\352a\221:H\n@"..., 32820, MSG_NOSIGNAL) = 32820
send(4,
"\352\"\3\360\304)\210\4U\312\230\360\205V\vs?r\245r\230\276\273\202\273\271\340\336\277hQ4"...,
84, MSG_NOSIGNAL) = 84
recv(4, 0x885f12c, 16384, MSG_NOSIGNAL) = -1 EAGAIN (Resource temporarily
unavailable)
select(5, [4], NULL, NULL, NULL)

... and then it hangs. Clearly there's a flaw here. It does a recv() but it
returns EAGAIN and then nothing more seems to come from the server so it hangs
on the select() call. Quite likely because the server already sent it and the
recv() was done in error.

-- 
  / daniel.haxx.se
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