Lennart Poettering
ee79c9d309
This takes inspiration from AT_FDCWD, but always references the root dir rather than the cwd. This allows various convenience uses, as we can now reference the root dir without actually allocating an fd for chaseat(), fd_get_path() and various others. The value of XAT_FDROOT is chosen so that it is not a valid fd (essential, because we do not intend to hook this up everywhere, just where we need it, just like AT_FCWD only works in some syscalls), and we want uses at the wrong places to fail cleanly. It also uses a valud outside of the range where we usually return negative errnos, i.e. < -ERRNO_MAX.
System and Service Manager
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