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This is the documentation for XY 2012, last updated April 27, 2013.
XY is an environment for GNU/Linux and a playground for innovative computer interfacing that aims to integrate the latest technology and hardware.
Website: http://bb.den-4.com/xy
Bugs: http://bb.den-4.com/xy/issues
Documentation: http://xy.readthedocs.org
XY is licensed under the MIT License; see LICENSE in the source distribution for details.
The configuration module reponsible for managing the configuration of xy. Any change to xy’s runtime configuration (RC) file will cause the configuration to be reloaded (see config_reinit()).
The type made available after a call to config_init(). It contains all the necessary configuration options xy uses while running.
Initializes xy’s configuration. Returns the configuration or NULL on failure. This function makes CONFIG available for use.
The configuration module’s shutdown hook.
Writes the default xy configuration to the xy runtime configuration path.
Reinitializes the configuration from the xy runtime configuration path.
A collection of utility functions meant to stand alone from other xy modules.
Returns the path of xy’s runtime configuration. The returned string should be freed by the caller.
Returns true if the strings are equal or null, false otherwise.
Removes leading and trailing whitespace from the string and returns a pointer starting from the first non-whitespace character. The returned string is contained in the same memory as the argument.
Example:
char *conststr = " test string ";
char *dup = strdup(conststr);
char *trimmed = trim(dup); // trimmed: "test string"
free(dup);
Dumps num_frames stack frames to stderr.
Tokenizes cmd by spaces into tokens placed in argv.
Example:
char *command = "some string here";
char *dup = strdup(command);
char *argv[3];
parse_command(dup, argv);
// argv[0]: "some"
// argv[1]: "string"
// argv[2]: "here"
free(dup);
Executes the supplied command by calling execvp. The command will be parsed before the call is made (see parse_command()).
The inotify module. XY uses the inotify module to react to changes occurring on the filesystem.
The inotify file descriptor made available after a call to xy_inotify_init(). This file descriptor is suitable for system calls like select and epoll.
Initializes xy’s inotify module. This function makes in_fd available for use, which may be -1 on failure.
Reinitializes the inotify module. This function makes a new in_fd available for use.
The inotify module’s shutdown hook.
Drains the inotify event queue of all events.
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The documentation for xy resides in the docs directory.
XY’s documentation is managed by Sphinx; the latest version is always available online.
Various examples for interacting and integrating with xy live in the examples directory.
The core of xy is housed in the lib directory. The real parts of xy live here – from utilities and library interefaces to modules like xy’s broadcasting engine.
The resources directory contains xy’s ancillary files. Resources for build automation and testing, images, and runtime resources are all held here.
The src directory contains xy’s main function - the application’s entry point. The main executable is built independently of xy’s libraries and tests to allow for things like parallel builds and a robust level of testing.
TODO - requirements currently in flux (njb)
The xy source tree is managed by Autotools. It follows a standard configure-and-build approach.
# ./configure --quiet
xy build configuration
----------------------
version : 2012
cflags : -pipe -std=c99 -Wall -Wunused -Wextra -Wno-unused-parameter -O0 -g3
tests : yes
optimizations : no
The default build configuration targets developers. To build xy for production use:
# ./configure --enable-optimizations --disable-tests --quiet
xy build configuration
----------------------
version : 2012
cflags : -pipe -std=c99 -Wall -Wunused -Wextra -Wno-unused-parameter -O3
tests : no
optimizations : yes
XY can be launched using ck-launch-session and a Xclients or xsession file in your home directory. Your login manager can also be configured to start xy for you. Refer to your distribution’s documentation for more information.
You can run xy under Valgrind, to help isolate memory leaks or troubleshoot performance problems. The overhead of running xy with Valgrind will make the interface cumbersome making xy unsuitable for regular use.
valgrind --tool=memcheck --leak-check=full --log-file=$HOME/valgrind.xy.log xy
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