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| author | Arne Babenhauserheide <arne_bab@web.de> | 2011-10-04 17:22:17 +0200 |
|---|---|---|
| committer | Arne Babenhauserheide <arne_bab@web.de> | 2011-10-04 17:22:17 +0200 |
| commit | d0bdae24b59dde1783f928992d414f608a42b266 (patch) | |
| tree | 052e5254f6207fa384bdddd64b5580d0718b83c4 /glibc/debugging/ld_so_console.mdwn | |
| parent | cf1d668a185777e48faa180f201f58f93dcf3950 (diff) | |
| parent | 67f614c029ba729a9451e87c4885c198fc10251b (diff) | |
manual merge
Diffstat (limited to 'glibc/debugging/ld_so_console.mdwn')
| -rw-r--r-- | glibc/debugging/ld_so_console.mdwn | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/glibc/debugging/ld_so_console.mdwn b/glibc/debugging/ld_so_console.mdwn new file mode 100644 index 00000000..b3d1762f --- /dev/null +++ b/glibc/debugging/ld_so_console.mdwn @@ -0,0 +1,20 @@ +[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +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 +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +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]])? |