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Paul Eggert authored
* src/fileio.c (Frename_file): Avoid calling Ffile_directory_p more than once on FILE. Use renameat_noreplace, so that we can ask the user (and unlink and retry) only if this fails with errno == EEXIST or ENOSYS. This avoids the need to ask the user for permission to do an operation that will fail anyway. Simplify computation of ok_if_already_exists for subsidiary functions. * src/filelock.c (rename_lock_file): Prefer renameat_noreplace if it works, as this avoids the need to link and unlink. * src/lisp.h (renameat_noreplace): New decl. * src/sysdep.c [HAVE_LINUX_FS_H]: Include linux/fs.h and sys/syscall.h. (renameat_noreplace): New function.
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