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Use generic IS_ABSOLUTE_FILE macro, and implement fd-to-filename for
windows. Reading from /proc/self obviously is not porable.
Change-Id: I805c5295871c13f4fa4b89eb89871fc100559318
Reviewed-by: Christian Kandeler <[email protected]>
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Windows needs that if you're not reading text.
Change-Id: I923782f2c47ef16765f52d6a435f69cb33f50dfd
Reviewed-by: Christian Kandeler <[email protected]>
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The MAX_BUILD_ID_BYTES is fairly large (64), while normally build-ids
are only 20 bytes long. But if we would encounter a jumbo build-id we
should have enough room to construct the full build-id path.
We used to substract 2 bytes from the max, because 2 chars are used
as subdir. But that should be 1 (2 hex chars is just one 8 bit byte).
Signed-off-by: Mark Wielaard <[email protected]>
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The logic that finds alt files and dwo files relies on having an open
file descriptor. But after all needed ELF data has been read the
underlying Elf file descriptor can be closed. libdwfl in particular
closes file descriptor fairly aggressively. So capture the directory
early on. And make dwfl set it if it has recorded it. Which it will
do now before closing a file descriptor for the main Dwfl_Module file.
Signed-off-by: Mark Wielaard <[email protected]>
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Add a new alt_fd field to the Dwarf struct. This tracks whether we tried
to open the alt file ourselves. This is used in dwarf_getalt to see if
we should try to find and open the alt file ourselves (if the user hasn't
called dwarf_setalt yet). dwarf_formref_die and dwarf_formstring now call
dwarf_getalt instead of accessing the alt_dwarf Dwarf field directly.
For applications using libdwfl nothing changes (dwfl will find, set and
clean up the alt file). For programs that set the alt file themselves
already through other means, nothing changes. But for applications that
don't create the Dwarf through libdwfl and don't set the alt file already
libdw will now try to find and set it on first access. If found the
application will now not get errors for missing alt files.
Add a simple testcase based on the existing allfcts test which already
tries to set the alt file, but is too simplistic to find it in some
subdir (relative to the main debug file).
Signed-off-by: Mark Wielaard <[email protected]>
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Signed-off-by: Florian Weimer <[email protected]>
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