We didn't have any tokenizer suitable for scanning something like a bash
command line. We do have a couple hacks, e.g. LLExternalEditor::tokenize() and
LLCommandLineParser::parseCommandLineString(). Both try to work around
boost::tokenizer limitations; but existing boost::tokenizer support just
doesn't address this case. Neither of the above is available as a general
scanner anyway, and parseCommandLineString() fails outright when passed "".
New getTokens() also distinguishes between "drop delimiters" (e.g. space,
return, newline) to be discarded from the token stream, versus "keep
delimiters" (e.g. "+-*/") to be returned as tokens in their own right.
There's an overload that honors escapes and a more efficient one that doesn't;
each has a convenience overload that returns the scanned string vector rather
than requiring a separate declaration.
Tweak and comment older getTokens() implementation.
Add unit tests for both old and new getTokens() implementations.
Break out StringVec and std::ostream << StringVec from
indra/llcommon/tests/listener.h to StringVec.h: that's coming in handy for a
number of different TUT test sources.

Clarify wording in some of the doc comments; be a bit more explicit about some
of the parameter fields.
Make some query methods 'const'.
Change default LLProcess::ReadPipe::getLimit() value to 0: don't post any
incoming data with notification event unless caller requests it. But do post
pertinent FILESLOT in case caller reuses same listener for both stdout and
stderr.
Use more idiomatic, readable syntax for accessing LLProcess::Params data.

If caller runs (e.g.) a Python script, it's not very helpful to a human log
reader to keep seeing LLProcess instances logged as /pathname/to/python (pid).
If caller is aware, the code can at least use the script name as the desc --
or maybe even a hint as to the script's purpose.
If caller doesn't explicitly pass a desc, at least shorten to just the
basename of the executable.

This way a caller need not spin on isRunning(); we can just listen for the
requested termination event.
Post a similar event containing error message if for any reason
LLProcess::create() failed to launch the child.
Add unit tests for both cases.

That is, trying to instantiate a ReadPipeImpl while another already existed
would throw an LLEventPump::DupPumpName exception. Fortunately this behavior
is easily bypassed.

The typos didn't make for invalid tests, but they made a few tests redundant
while leaving other (subtly different) cases untested.

Add unit tests for peek() with substring args, reimplemented contains(),
various forms of find().
(yay unit tests)

If it's useful to have contains() to tell you whether incoming data contains a
particular substring, and if it's useful for contains() and peek() to accept
an offset within that data, then it's useful to allow you to get the offset of
a desired substring within that data. But of course a find() returning offset
needs something like std::string::npos for "not found"; borrow that
convention.
Support both find(const std::string&) and find(char); the latter permits a
more efficient implementation. In fact, make find(string) recognize a string
of length 1 and leverage the find(char) implementation.
Given that, reimplement contains(mumble) as shorthand for find(mumble) != npos.
Implement find() overloads using std::search() and std::find() on
boost::asio::streambuf character iterators, rather than copying to std::string
and then using string search like previous contains() implementation.
Reimplement WritePipeImpl::tick() and ReadPipeImpl::tick() to write/read
directly from/to boost::asio::streambuf data, instead of copying to/from a
temporary flat buffer.
As long as ReadPipeImpl::tick() keeps successfully filling buffers, keep
reading. Previous implementation would only handle a long child write over
successive tick() calls. Stop on read error or when we come up short.

These are all very well when we just want to dump the output to a log, or
whatever, but in a unit-test context it matters for comparison.

Also add "len" key to event data on LLProcess::getPump(). If you've used
setLimit(), event["data"].length() may not reflect the length of the
accumulated data in the ReadPipe.
Add unit test with stdin/stdout handshake with child process.

In the course of re-enabling the indra/test tests last year, Log generalized a
workaround I'd introduced in llsdmessage_test.cpp. In Linux viewer land, a
test program trying to catch an expected exception can't seem to catch it by
its specific class (across the libllcommon.so boundary), but must instead
catch std::runtime_error and validate the typeid().name() string. Log added a
macro for this idiom in llevents_tut.cpp. Generalize that macro further for
normal-case processing as well, move it to a header file of its own and use it
in all known places -- plus the new exception-catching tests in
llprocess_test.cpp.

Add LLProcess::FileParam to specify how to construct each child's standard
file slot, with lots of comments about features designed but not yet
implemented. The point is to design it with enough flexibility to be able to
extend to foreseeable use cases.
Add LLProcess::Params::files to collect up to 3 FileParam items. Naturally
this extends the accepted LLSD syntax as well.
Implement type="" (child inherits parent file descriptor) and "pipe" (parent
constructs anonymous pipe to pass to child).
Add LLProcess::FILESLOT enum, plus methods:
getReadPipe(FILESLOT), getOptReadPipe(FILESLOT)
getWritePipe(), getOptWritePipe()
getPipeName(FILESLOT): placeholder implementation for now
Add LLProcess::ReadPipe and WritePipe classes, as returned by get*Pipe().
WritePipe supports get_ostream() method for streaming to child stdin.
ReadPipe supports get_istream() method for reading from child stdout/stderr.
It also provides getPump() returning LLEventPump& so interested parties can
listen for arrival of new data on the aforementioned std::istream.
For "pipe" slots, instantiate appropriate *Pipe class.
ReadPipe and WritePipe classes are pure virtual bases for ReadPipeImpl and
WritePipeImpl, respectively: all implementation data are hidden in the latter
classes, visible only in llprocess.cpp. In fact each *PipeImpl class registers
itself for "mainloop" ticks, attempting nonblocking I/O to the underlying
apr_file_t on each tick. Data are buffered in a boost::asio::streambuf, which
bridges between std::[io]stream and the APR I/O calls.
Sanity-test ReadPipeImpl by using a pipe to absorb the Python "SyntaxError"
output from the successful syntax_error test, rather than alarming the user.
Add first few unit tests for validating FileParam. More tests coming!

When we reimplemented LLProcess on APR, necessitating APR's funny callback
mechanism to sense child-process status, every isRunning() or getStatus() call
called the APR poll function that calls ALL registered LLProcess callbacks. In
other words, every time any consumer called any LLProcess::isRunning() method,
all LLProcess callbacks were redundantly fired. Change that so that the single
APR poll function is called once per frame, courtesy of the "mainloop"
LLEventPump. Once per viewer frame should be well within the realtime duration
in which it's reasonable to expect child-process status to change.
In effect, this changes LLProcess's public API to introduce a dependency on
"mainloop" ticks. Add such ticks to llprocess_test.cpp as well.

Turns out that some (many?) wildcard LLManifest.path(wildcard) calls are "just
in case": sweep up any (e.g.) "*.tga" files there may be, but no problem if
there are none.
Change path() logic so it tries the next tree (source, artwork, build) if
either a specific (non-wildcard) filename doesn't exist, as now, OR if a
wildcard matches 0 files in the current tree. This continues to support "just
in case" wildcards, while permitting wildcards to work in the artwork and
build trees as well as the source tree.
Use a more specific exception than ManifestError for missing file. Only in
that case should we try the next tree. Any other ManifestError should
propagate.

This APR merges work from Huseby, Log, Leslie, Nat.

viewer_manifest.py's Linux_i686Manifest class has contained directives to copy
library files with names like (e.g.) "libapr-1.so.0.4.2", which means that
every update to any such library requires messing with viewer_manifest.py.
But LLManifest.path() claims to support wildcards, and it's more robust to
specify "libapr-1.so*" instead.
Unfortunately LLManifest.path()'s wildcard support only used to work for files
in the source tree (vs. the artwork tree or the build tree). The logic in
path() tries each tree in turn, relying on an exception to make it try the
next tree. This exception was raised for a nonexistent specific filename --
but it never used to raise that exception for a wildcard matching 0 files.
Instead it would simply report "0 files" and proceed, producing an invalid
viewer install.
Raise that exception for a wildcard matching nothing. This forces path() to
consider the artwork tree and the build tree, permitting us to use wildcards
in library names.
Define an exception specific to LLManifest: ManifestException rather than the
generic Python RuntimeException. Make it a subclass of RuntimeException so any
existing callers expecting to catch RuntimeException will continue to work.

LLJob was vestigial code from before migrating Job Object support into APR.
Also add APR signal-name string to getStatusString() output.

On Linux, new (Feb 2012) APR package produces link errors. Until those are
resolved, leave Linux viewer build with older (Feb 2011) APR package.

Once again we've been bitten by comparison failure between "c:\somepath" and
"C:\somepath". Normalize paths in both Python helper scripts to make that
comparison more robust.

Apparently something in the Linux system header chain #defines a macro Status
as 'int'. That's just Bad in C++ land. It should at the very least be a
typedef! #undefining it in llprocess.h permits the viewer to build.

Include logic to engage Linden apr_procattr_autokill_set() extension: on
Windows, magic CreateProcess() flag must be pushed down into apr_proc_create()
level. When using an APR package without that extension, present
implementation should lock (e.g.) SLVoice.exe lifespan to viewer's on Windows
XP but probably won't on Windows 7: need magic flag on CreateProcess().
Using APR child-termination callback requires us to define state (e.g.
LLProcess::RUNNING). Take the opportunity to present Status, capturing state
and (if terminated) rc or signal number; but since most of the time all caller
really wants is to log the outcome, also present status string, encapsulating
logic to examine state and describe exited-with-rc vs. killed-by-signal.
New Status logic may report clearer results in the case of a Windows child
process killed by exception.
Clarify that static LLProcess::isRunning(handle) overload is only for use when
the original LLProcess object has been destroyed: really only for unit tests.
We necessarily retain our original platform-specific implementations for just
that one method. (Nonstatic isRunning() no longer calls static method.)
Clarify log output from llprocess_test.cpp in a couple places.

Any RAII class should either be noncopyable or should deal appropriately with
a copy operation. ManageAPR is intended only for extremely simple cases, and
hence should be noncopyable.