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libbacktrace: pass -1 to error callback for unrecognized DWARF

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PR libbacktrace/98818
	* dwarf.c (dwarf_buf_error): Add errnum parameter.  Change all
	callers.
	* backtrace.h: Update backtrace_error_callback comment.
This commit is contained in:
Ian Lance Taylor
2021-03-02 13:45:56 -08:00
parent 7854b0bc25
commit 59473f7906
2 changed files with 43 additions and 30 deletions
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15
backtrace.h
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@@ -54,13 +54,14 @@ struct backtrace_state;
invalid after this function returns.
As a special case, the ERRNUM argument will be passed as -1 if no
debug info can be found for the executable, but the function
requires debug info (e.g., backtrace_full, backtrace_pcinfo). The
MSG in this case will be something along the lines of "no debug
info". Similarly, ERRNUM will be passed as -1 if there is no
symbol table, but the function requires a symbol table (e.g.,
backtrace_syminfo). This may be used as a signal that some other
approach should be tried. */
debug info can be found for the executable, or if the debug info
exists but has an unsupported version, but the function requires
debug info (e.g., backtrace_full, backtrace_pcinfo). The MSG in
this case will be something along the lines of "no debug info".
Similarly, ERRNUM will be passed as -1 if there is no symbol table,
but the function requires a symbol table (e.g., backtrace_syminfo).
This may be used as a signal that some other approach should be
tried. */
typedef void (*backtrace_error_callback) (void *data, const char *msg,
int errnum);