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Simplified documentation of send().

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Diego Nehab 2005-11-24 20:29:28 +00:00
parent 7dace4af7e
commit 96da86a81f
1 changed files with 11 additions and 28 deletions
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doc/tcp.html
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@ -331,34 +331,17 @@ substring to be sent.
</p>
<p class=return>
If successful, the method returns the number of bytes sent.
In case of error, the method returns
<b><tt>nil</tt></b>, followed by an error message, followed by the
index of the first character within <tt>[i, j]</tt> that has not been sent yet
(you might want to try again from then on). The error message can be '<tt>closed</tt>' in case
the connection was closed before the transmission was completed or the
string '<tt>timeout</tt>' in case there was a timeout during the
operation.
</p>
<p class=note>
<b>Important note</b>:
The return values for the <tt>send</tt> method have been changed in
LuaSocket 2.0 alpha <b>and again</b> in the beta (sorry)!
In previous versions, the method returned only the
error message. Since returning <b><tt>nil</tt></b> in case of success was
nonsense, in alpha the first return value became the number of bytes sent.
Alas, it wasn't returning <tt><b>nil</b></tt> in case of
error. So it was changed again in beta.
</p>
<p class=note>
<b>Also important</b>:
In order to better support non-blocking I/O and to discourage
bad practice, the <tt>send</tt> method now only sends one string
per call. The other optional arguments allow the user to select
a substring to be sent in a much more efficient way than
using <tt>string.sub</tt>.
If successful, the method returns the index of the last byte
within <tt>[i, j]</tt> that has been sent. Notice that, if
<tt>i</tt> is 1 or absent, this is effectively the total
number of bytes sent. In case of error, the method returns
<b><tt>nil</tt></b>, followed by an error message, followed
by the index of the last byte within <tt>[i, j]</tt> that
has been sent. You might want to try again from the byte
following that. The error message can be '<tt>closed</tt>'
in case the connection was closed before the transmission
was completed or the string '<tt>timeout</tt>' in case
there was a timeout during the operation.
</p>
<p class=note>