Adding proper error messages for Win32 shmop #20944
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Add proper errno setting for all error paths in shmget() on Windows. Introduces tsrm_set_errno_from_win32_error() to map Windows error codes to POSIX errno values (EACCES, ENOMEM, EINVAL, EEXIST, ENOENT). This ensures that shmop_open() can provide meaningful error messages to users instead of "No error" when operations fail. Tests added to verify errno mapping for different error conditions.
Set errno for error conditions in shmdt() and shmctl(): - EINVAL for invalid segment address/key - Windows error mapping for UnmapViewOfFile failures - EINVAL for unknown shmctl commands This completes errno handling for all shmop system calls on Windows.
Add proper handle cleanup when marking shared memory segment for deletion. Previously, shmctl(IPC_RMID) only marked the segment by setting key to -1 but did not close the Windows file mapping handle, causing the segment to persist in the system. This led to errors when trying to reopen segments with the same key: - Segment remained accessible via OpenFileMapping() - But had key = -1, failing validation checks - Resulted in "Invalid argument" errors Now properly closes the handle, allowing Windows to destroy the named mapping object when no processes are attached, matching POSIX semantics where IPC_RMID marks segment for deletion. Fixes issue where shmop_open() with 'c' flag fails after shmop_delete().
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You should effectively never target a patch. If something needs to be included in a patch that is already branched, the commit will be cherry-picked by the release manager. So, if this fixes a bug and the patch isn't risky, you should target |
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In the current Win32 shmop implementation, messages like
This happens because the
errnovariable is not populated correctly on Win32.This change fixes the Win32 logic so that error messages roughly match the actual outcome. Unfortunately, it is still not perfect, as there is a case with differing segment sizes that is handled as an invalid descriptor.