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