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Stefan Richter d80678dc55 Save and restore errno in raw1394_new_handle{,_on_port} for legacy applications 
Since dual-stack capability was added to libraw1394, raw1394_new_handle()
and raw1394_new_handle_on_port() began to alter errno even when succeeding.
This breaks old application code which contains the bug of checking for
failure in errno rather than in the return code of said functions, or
similar bugs with wrong assumptions about errno.

While those applications should be fixed, it may not always be possible or
feasible to do so.  Hence add a workaround to libraw1394 which saves and
restores errno in said two functions.

From a superficial review of dispatch.c, it seems that these two functions
are the only ones where such a workaround may be needed.  However, this may
not be true if any fw_XYZ() function implementation differs from the
counterpart ieee1394_XYZ() function in the way that the former alters errno
during successful execution while the latter does not.  To be clear,
altering errno in absence of failure is absolutely allowed in library code
(except for signal handlers), yet it may be unexpected and be perceived as
a library or kernel regression if the application client code is buggy in
this regard.

Reported-by: Vladimir Romanov <blueboar2@gmail.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
 		2013-08-24 13:07:37 +02:00
debian fix make dist without doc 2004-10-31 00:52:28 +00:00
doc doc: let "make clean" remove generated HTML files 2010-02-01 22:10:12 +01:00
src Save and restore errno in raw1394_new_handle{,_on_port} for legacy applications 2013-08-24 13:07:37 +02:00
tools tools: Fix startup of dumpiso and sendiso on juju 2013-08-24 11:51:11 +02:00
AUTHORS configure.ac, Changelog, NEWS etc.: update to version 2.0.6 2010-11-01 23:25:36 +01:00
COPYING.LIB Ensure this ends up in distributions. 2000-03-12 04:08:48 +00:00
ChangeLog Changelog, NEWS: update to version 2.1.0 2012-07-29 12:01:44 +02:00
INSTALL Reset the libtool age. 2008-07-18 01:08:30 -07:00
Makefile.am Fix build due to incomplete tarball. 2009-06-30 11:12:55 -07:00
NEWS Changelog, NEWS: update to version 2.1.0 2012-07-29 12:01:44 +02:00
README configure.ac, Changelog, NEWS etc.: update to version 2.0.6 2010-11-01 23:25:36 +01:00
autogen.sh Ooops...libtool works a bit different than I thought, but atleast it works 2003-07-13 01:27:13 +00:00
configure.ac Increase libtool version to 2.1.0 2012-06-18 02:07:31 +02:00
libraw1394.pc.in pkgconfig include path should not contain libraw1394 2004-11-20 04:56:36 +00:00
libraw1394.spec.in bump versions, build fixes, and doc updates 2004-10-30 22:49:27 +00:00

README 

				   libraw1394
				   ==========

1. About libraw1394

	libraw1394 is the only supported interface to the kernel side raw1394 of
the Linux IEEE-1394 subsystem, which provides direct access to the connected
1394 buses to user space.  Through libraw1394/raw1394, applications can directly
send to and receive from other nodes without requiring a kernel driver for the
protocol in question.

	The reason for making a library the interface to the kernel is to avoid
a program dependency on the kernel version, which would hinder development and
optimization of raw1394.  If development changed the protocol and made it
incompatible with previous versions only the libraw1394 has to be upgraded to
match the kernel version (instead of all applications).

	Since version 2, libraw1394 also works with the kernel driver
firewire-core.  libraw1394's role has thus become that of a raw1394
compatibility layer for existing applications when running on firewire-core.


2. Copyleft

	libraw1394 itself is licensed under the Lesser General Public License
(short LGPL, see file COPYING.LIB in the source distribution).  Other files in
the source archives not belonging to but being part of the build procedure of
libraw1394 are under their own licenses, as stated at the top of the individual
files.


3. API documentation

	Finally there is something, in the doc subdirectory.  The file is
libraw1394.sgml (it's Docbook format), and there are preformatted PostScript and
HTML available.  This documentation is not complete yet.


4. Multithreading

	This library should be multithreadable with the restriction that one
raw1394handle_t may be used only within a single thread.  Multiple threads
operating on the same handle would royally mess up the kernel-user protocol.
Simply use separate handles for each thread in which you need to use libraw1394.


5. Pkg-config

	The library comes with a pkg-config .pc file, so you can check for
libraw1394 and its version in your configure script.  For example, here is how 
to use the autoconf macro:

PKG_CHECK_MODULES(LIBRAW1394, libraw1394 >= 1.1.0)

	This macro sets the variables LIBRAW1394_CFLAGS and LIBRAW1394_LIBS.  You 
have to include those into your build variables so that the build process 
correctly links with libraw1394.


6. Contact

	Send questions, suggestions, bug reports and patches to the mailing
list linux1394-devel@lists.sourceforge.net.  This list is open for posting
without prior subscription, and replies will usually be Cc'd to you.  Visit
http://ieee1394.wiki.kernel.org/ for links to list subscription interfaces and
list archives.

	Maintainer of libraw1394 is currently Stefan Richter.  See the file
AUTHORS for a complete list of contributors to libraw1394.

	Source repository:
git://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git
http://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git
https://git.kernel.org/pub/scm/libs/ieee1394/libraw1394.git

	Gitweb:
http://git.kernel.org/?p=libs/ieee1394/libraw1394.git

	Release tarballs:
https://www.kernel.org/pub/linux/libs/ieee1394/
ftp://ftp.kernel.org/pub/linux/libs/ieee1394/