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From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 8 May 2013 23:55:13 -0400
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Message-Id: <201305082355.14183.vapier@gentoo.org>
Subject: [LTP] new sub-project proposal of utility commands for poking
	funcs/syscalls directly
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i wrote a testsuite for the Gentoo sandbox project.  for people unfamiliar=
=20
with this project, it's similar to fakeroot.  a readme with more details:
http://git.overlays.gentoo.org/gitweb/?p=3Dproj/sandbox.git;a=3Dblob;f=3DRE=
ADME

in order to test this project, i need to be able to easily & quickly run=20
specific C library funcs and syscalls.  writing small C files with the righ=
t=20
args is a pain and doesn't scale at all.  so i wrote a framework from scrat=
ch=20
which allows poking funcs from the command line:
http://git.overlays.gentoo.org/gitweb/?p=3Dproj/sandbox.git;a=3Dtree;f=3Dte=
sts

strace has need of pretty much the same thing.  atm, it's running higher le=
vel=20
tools like `stat` and `dd` and `find`, but this gets unmanageable quickly a=
s we=20
try to scale to more arches and tests.

rather than hosting the tests in the sandbox or the strace repo (and trying=
 to=20
import into the other), it seemed more natural to start a new sub-project=20
under the LTP umbrella.  we wouldn't want it to be in the main LTP repo sin=
ce=20
we can't check out subdirs w/git, so it'd have to be a new one.

what do people think ?  any suggestions on a name ?  how about "foker", the=
=20
function poker ?

as an example, i can quickly produce tools like so:
$ ./mkdirat-0=20
usage: mkdirat <tests>
test: < <ret> <dirfd> <path> <mode> >

<ret>      :=3D #[,<errno>]; # is a decimal and errno can be symbolic
<dirfd>    :=3D AT_FDCWD | fd # | path[:<flags>[:<mode>]]
<mode>     :=3D 0x# (for hex) | 0# (for octal) | # (for decimal)

$ strace -emkdirat ./mkdirat-0 0 AT_FDCWD dir 0777
mkdirat(AT_FDCWD, "dir", 0777)          =3D 0

the source file for this contains just enough to describe the signature of =
the=20
mkdirat() function:
#define CONFIG HAVE_MKDIRAT
#define FUNC mkdirat
#define SFUNC "mkdirat"
#define FUNC_STR "%i, \"%s\", %o"
#define FUNC_IMP dirfd, path, mode
#define ARG_CNT 3
#define ARG_USE "<dirfd> <path> <mode>"

#define process_args() \
	s =3D argv[i++]; \
	int dirfd =3D at_get_fd(s); \
	\
	s =3D argv[i++]; \
	char *path =3D s; \
	\
	s =3D argv[i++]; \
	mode_t mode =3D sscanf_mode_t(s);

#include "test-skel-0.c"
=2Dmike

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