8000 Add support for the MINIDUMP_HANDLE_DATA_STREAM on Linux · Issue #92 · rust-minidump/minidump-writer · GitHub
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Add support for the MINIDUMP_HANDLE_DATA_STREAM on Linux #92

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Add support for the MINIDUMP_HANDLE_DATA_STREAM on Linux#92

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@gabrielesvelto
gabrielesvelto
opened on Oct 26, 2023

We'd like to record all the open file descriptors in a process. Windows minidumps populate the MINIDUMP_HANDLE_DATA_STREAM for this purpose and I'm adding support to rust-minidump for it, see rust-minidump/rust-minidump#885

The idea is to repurpose this stream to capture Linux fd information by storing the contents of /proc/<pid>/fd. Every entry in the stream would be a MINIDUMP_HANDLE_DESCRIPTOR with the following fields set:

  • handle would contain the fd number
  • object_name_rva would point to a string holding the file path
  • attributes would hold the contents of the st_mode field of the stat structure
  • All other fields would be zero

This would lose some information (e.g. number of hardlinks, UID/GID, etc...) but keep most of what interests us. In case we need it in the future we could extend this information with a custom MINIDUMP_HANDLE_OBJECT_INFORMATION structure that holds the missing bits (note that I'm reluctant to repurpose the other fields of MINIDUMP_HANDLE_DESCRIPTOR for these bits as IMHO it would be confusing).

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