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Paul Eggert authored
* fileio.c (close_file_unwind): Don't close if FD is negative; this can happen when unwinding a zapped file descriptor. (Finsert_file_contents): Unwind-protect the fd before the point marker, in case Emacs runs out of memory between the two unwind-protects. Don't trash errno when closing FD. Zap the FD in the specpdl when closing it, instead of deferring the removal of the unwind-protect; this fixes a bug where a child function unwinds the stack past us. Fixes: debbugs:14839
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