In this case fseek() has to operate by reading the file as the internal format is translated on the fly, so calling fseek() is the same amount of work as just reading the file.

I just ran the hanging case in the VMS debugger and a breakpoint at lib/file.c file_upload did not get tripped.

Interrupting the hang gets me to:

     r = select(3, empty struct/array, empty , empty, tv_sec=1)

     select Curl_poll
     multi curl_multi_wait
     easy curl_easy_perform
     tool_operate operate
     tool_main main

So the hang may be a different bug than this. I will have to look at this more later as it is clear that curl in wait loop, so I have missed where I need to set the break point.

The server in this case is Apache 2.0 running on OpenVMS Alpha 8.4.

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** [bugs:#758] VMS-Alpha, http-upload not working**
**Status:** open-confirmed
**Labels:** http VMS 
**Created:** Mon Aug 18, 2008 04:09 PM UTC by Harald Schwarz
**Last Updated:** Mon Jul 15, 2013 09:45 AM UTC
**Owner:** Daniel Stenberg
On VMS-Alpha: 
When using an http-file-upload the file is not sent to the Server with the correct content-length. 
Sending a file with 511 or less bytes, content-length 512 is used. 
Sending a file with 513 - 1023 bytes, content-length 1024 is used. 
Files with a length of a multiple of 512 Bytes show the correct content-length. Only these files work for upload.
Test-Commands on VMS-Alpha, Linux \(Suse\) and Windows: 
curl --form myfile=@test.ras --trace-ascii testras.log http://my\_web\_test\_server/cgi-bin/upload.pl 
curl --form myfile=@test.doc --trace-ascii testdoc.log http://my\_web\_test\_server/cgi-bin/upload.pl
File test.doc has the size 21.504 \(multiple of 512\) 
File test.ras has the size  5.686 \(not a multiple of 512\).
Using test.doc everything works. 
Using test.ras the Content-Length in the LOG-File differs from the content length on Linux/Windows. 
The receiving program \(in my testcase "upload.pl"\) says that I have a post-data mismatch.
VMS shows: 
002c: Content-Disposition: form-data; name="myfile"; filename="test.ra 
006c: s" 
0070: Content-Type: application/octet-stream 
0098: 
=> Send data, 6144 bytes \(0x1800\)
Linux + Windows show: 
002c: Content-Disposition: form-data; name="myfile"; filename="test.ra 
006c: s" 
0070: Content-Type: application/octet-stream 
0098: 
=> Send data, 5686 bytes \(0x1636\)
My workaround: I wrote a perl-program to add some bytes to the file to have a multiple of 512 Bytes. The CGI-Program \(upload.pl\) then reduces the filesize back to the origin.
This workaround works for all files with all sizes - but the error in curl still remains. 
Now I have to say, that I'm not a C-Programmer, so I kindly ask for help.
If you need a VMS-Alpha for testing \(incl. Compiler, ...\), please have a look at www.polarhome.com. 
On VMS-Alpha: before you can use "curl" as a program you have to define a symbol that points to CURL.EXE. 
curl = "$...\[...\]CURL.EXE" 
Then "curl" can be startet as described above.
Used CURL-Version on all systems: 7.18.2.
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