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Belatedly document batch file restrictions

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The server rejects redirections in batch files since commit ed8e0cd5,
and execute commands since commit adfab434, both v4.3.11.
This commit is contained in:
Markus Armbruster 2009-04-05 10:55:46 +02:00
parent df62b8604d
commit 92ce7cf665
1 changed files with 10 additions and 5 deletions
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15
doc/clients-howto
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@ -242,12 +242,14 @@ The following ids occur:
signal interrupt if it is unable or unwilling to send the complete signal interrupt if it is unable or unwilling to send the complete
batch file. batch file.
While executing the batch file, the server sends no C_PROMPT command While executing the batch file, the server rejects redirections and
prompts. It still sends C_FLUSH argument prompts. execute commands, and sends no C_PROMPT command prompts. It still
sends C_FLUSH argument prompts.
Protocol flaw: not sending C_PROMPT here screws up redirections: Protocol flaw: not sending C_PROMPT here screws up redirections:
they apply until the next C_PROMPT, i.e. from start of redirected they'd apply until the next C_PROMPT, i.e. from start of redirected
command until end of containing batch file. command until end of containing batch file. That's why the server
rejects redirections in batch files.
Certain bad failures make the server ignore the rest of the batch Certain bad failures make the server ignore the rest of the batch
file file. This feature is too hard to predict to be really useful. file file. This feature is too hard to predict to be really useful.
@ -255,7 +257,10 @@ The following ids occur:
Protocol flaw: strictly asynchronous clients cannot support Protocol flaw: strictly asynchronous clients cannot support
C_EXECUTE correctly. By the time C_EXECUTE arrives, the client may C_EXECUTE correctly. By the time C_EXECUTE arrives, the client may
have sent more input already. That input `overtakes' the contents have sent more input already. That input `overtakes' the contents
of the batch file in the input stream. of the batch file in the input stream, and is interpreted as part of
the batch file. Because this is almost certain to happen when the
execute comes from a batch file, the server rejects execute commands
there.
emp_client has this problem. emp_client has this problem.