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[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
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id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
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If you need to debug something in the early `ld.so` startup, and can't refrain
from good old `printf` debugging, there is a caveat: the available API in
`ld.so` is rather limited. See the few functions is `dl-sysdep.c`. For
example, there's a private `__libc_write`, which you should be able to use for
writing to FD stderr -- but, at early `ld.so` startup, this isn't usable as
`_hurd_init_dtable` is still all zeros, etc. To get you started, here is a
simple [[dl-sysdep.c.patch]] to get access to the Mach console.
Can this be integrated with the other debugging printf functions from
`elf/dl-misc.c` (`_dl_debug_vdprintf`) ([[!taglink open_issue_glibc]])?
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