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94 lines
3.8 KiB
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94 lines
3.8 KiB
Plaintext
Curl on Symbian OS
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==================
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This is a basic port of curl and libcurl to Symbian OS. The port is
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a straightforward one using Symbian's P.I.P.S. POSIX compatibility
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layer, which was first available for OS version 9.1. A more complete
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port would involve writing a Symbian C++ binding, or wrapping libcurl
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as a Symbian application server with a C++ API to handle requests
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from client applications as well as creating a GUI application to allow
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file transfers. The author has no current plans to do so.
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This means that integration with standard Symbian OS programs can be
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tricky, since libcurl isn't designed with Symbian's native asynchronous
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message passing idioms in mind. However, it may be possible to use libcurl
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in an active object-based application through libcurl's multi interface.
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The port is most easily used when porting POSIX applications to Symbian
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OS using P.I.P.S. (a.k.a. Open C).
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libcurl is built as a standard Symbian ordinal-linked DLL, and curl is
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built as a text mode EXE application. They have not been Symbian
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Signed, which is required in order to install them on most phones.
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Following are some things to keep in mind when using this port.
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curl notes
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----------
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When starting curl in the Windows emulator from the Windows command-line,
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place a double-dash -- before the first curl command-line option.
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e.g. \epoc32\release\winscw\udeb\curl -- -v http://localhost/
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Failure to do so may mean that some of your options won't be correctly
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processed.
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Symbian's ESHELL allows for redirecting stdin and stdout to files, but
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stderr goes to the epocwind.out file (on the emulator). The standard
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curl options -o, --stderr and --trace-ascii can be used to
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redirect output to a file (or stdout) instead.
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P.I.P.S. doesn't inherit the current working directory at startup from
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the shell, so relative path names are always relative to
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C:\Private\f0206442\.
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P.I.P.S. provides no way to disable echoing of characters as they are
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entered, so passwords typed in on the console will be visible. It also
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line buffers keyboard input so interactive telnet sessions are not very
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feasible.
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All screen output disappears after curl exits, so after a command completes,
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curl waits by default for Enter to be pressed before exiting. This behaviour
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is suppressed when the -s option is given.
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curl's "home directory" in Symbian is C:\Private\f0206442\. The .curlrc file
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is read from this directory on startup.
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libcurl notes
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-------------
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libcurl uses writable static data, so the EPOCALLOWDLLDATA option is
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used in its MMP file, with the corresponding additional memory usage
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and limitations on the Windows emulator.
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curl_global_init() *must* be called (either explicitly or implicitly through
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calling certain other libcurl functions) before any libcurl functions
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that could allocate memory (like curl_getenv()).
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P.I.P.S. doesn't support signals or the alarm() call, so some timeouts
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(such as the connect timeout) are not honoured. This should not be
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an issue once support for CURLRES_THREADED is added for Symbian.
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P.I.P.S. causes a USER:87 panic if certain timeouts much longer than
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half an hour are selected.
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LDAP, SCP or SFTP methods are not supported due to lack of support for
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the dependent libraries on Symbian.
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gzip and deflate decompression is supported when the appropriate macro
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is uncommented in the libcurl.mmp file.
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SSL/TLS encryption is not enabled by default, but it is possible to add
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when the OpenSSL libraries included in the S60 Open C SDK are available.
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The appropriate macro in the libcurl.mmp file must be uncommented to
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enable support.
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NTLM authentication may not work on some servers due to the lack of
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MD4 support in the OpenSSL libraries included with Open C.
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Debug builds are not supported (i.e. --enable-debug) because they cause
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additional symbol exports in the library which are not frozen in the .def
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files.
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Dan Fandrich
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dan@coneharvesters.com
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March 2010
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