Initial revision of Light Media Scanner.

Provides barebones for future work, plugin support is already
included, but no SQLite3 handling is done yet.

22 files changed, 1985 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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index 0000000..a55a5c3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,25 @@
+*~
+*.o
+*.so
+.deps
+.libs
+*.la
+*.lo
+Makefile.in
+Makefile
+aclocal.m4
+autom4te.cache
+compile
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-h1
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..53ff931
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1 @@
+Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..8add30a
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,504 @@
+		  GNU LESSER GENERAL PUBLIC LICENSE
+		       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/ChangeLog
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..5458714
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,234 @@
+Installation Instructions
+*************************
+
+Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
+2006 Free Software Foundation, Inc.
+
+This file is free documentation; the Free Software Foundation gives
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+Basic Installation
+==================
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+
+  4. Type `make install' to install the programs and any data files and
+     documentation.
+
+  5. You can remove the program binaries and object files from the
+     source code directory by typing `make clean'.  To also remove the
+     files that `configure' created (so you can compile the package for
+     a different kind of computer), type `make distclean'.  There is
+     also a `make maintainer-clean' target, but that is intended mainly
+     for the package's developers.  If you use it, you may have to get
+     all sorts of other programs in order to regenerate files that came
+     with the distribution.
+
+Compilers and Options
+=====================
+
+Some systems require unusual options for compilation or linking that the
+`configure' script does not know about.  Run `./configure --help' for
+details on some of the pertinent environment variables.
+
+   You can give `configure' initial values for configuration parameters
+by setting variables in the command line or in the environment.  Here
+is an example:
+
+     ./configure CC=c99 CFLAGS=-g LIBS=-lposix
+
+   *Note Defining Variables::, for more details.
+
+Compiling For Multiple Architectures
+====================================
+
+You can compile the package for more than one kind of computer at the
+same time, by placing the object files for each architecture in their
+own directory.  To do this, you can use GNU `make'.  `cd' to the
+directory where you want the object files and executables to go and run
+the `configure' script.  `configure' automatically checks for the
+source code in the directory that `configure' is in and in `..'.
+
+   With a non-GNU `make', it is safer to compile the package for one
+architecture at a time in the source code directory.  After you have
+installed the package for one architecture, use `make distclean' before
+reconfiguring for another architecture.
+
+Installation Names
+==================
+
+By default, `make install' installs the package's commands under
+`/usr/local/bin', include files under `/usr/local/include', etc.  You
+can specify an installation prefix other than `/usr/local' by giving
+`configure' the option `--prefix=PREFIX'.
+
+   You can specify separate installation prefixes for
+architecture-specific files and architecture-independent files.  If you
+pass the option `--exec-prefix=PREFIX' to `configure', the package uses
+PREFIX as the prefix for installing programs and libraries.
+Documentation and other data files still use the regular prefix.
+
+   In addition, if you use an unusual directory layout you can give
+options like `--bindir=DIR' to specify different values for particular
+kinds of files.  Run `configure --help' for a list of the directories
+you can set and what kinds of files go in them.
+
+   If the package supports it, you can cause programs to be installed
+with an extra prefix or suffix on their names by giving `configure' the
+option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
+
+Optional Features
+=================
+
+Some packages pay attention to `--enable-FEATURE' options to
+`configure', where FEATURE indicates an optional part of the package.
+They may also pay attention to `--with-PACKAGE' options, where PACKAGE
+is something like `gnu-as' or `x' (for the X Window System).  The
+`README' should mention any `--enable-' and `--with-' options that the
+package recognizes.
+
+   For packages that use the X Window System, `configure' can usually
+find the X include and library files automatically, but if it doesn't,
+you can use the `configure' options `--x-includes=DIR' and
+`--x-libraries=DIR' to specify their locations.
+
+Specifying the System Type
+==========================
+
+There may be some features `configure' cannot figure out automatically,
+but needs to determine by the type of machine the package will run on.
+Usually, assuming the package is built to be run on the _same_
+architectures, `configure' can figure that out, but if it prints a
+message saying it cannot guess the machine type, give it the
+`--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as `sun4', or a canonical name which has the form:
+
+     CPU-COMPANY-SYSTEM
+
+where SYSTEM can have one of these forms:
+
+     OS KERNEL-OS
+
+   See the file `config.sub' for the possible values of each field.  If
+`config.sub' isn't included in this package, then this package doesn't
+need to know the machine type.
+
+   If you are _building_ compiler tools for cross-compiling, you should
+use the option `--target=TYPE' to select the type of system they will
+produce code for.
+
+   If you want to _use_ a cross compiler, that generates code for a
+platform different from the build platform, you should specify the
+"host" platform (i.e., that on which the generated programs will
+eventually be run) with `--host=TYPE'.
+
+Sharing Defaults
+================
+
+If you want to set default values for `configure' scripts to share, you
+can create a site shell script called `config.site' that gives default
+values for variables like `CC', `cache_file', and `prefix'.
+`configure' looks for `PREFIX/share/config.site' if it exists, then
+`PREFIX/etc/config.site' if it exists.  Or, you can set the
+`CONFIG_SITE' environment variable to the location of the site script.
+A warning: not all `configure' scripts look for a site script.
+
+Defining Variables
+==================
+
+Variables not defined in a site shell script can be set in the
+environment passed to `configure'.  However, some packages may run
+configure again during the build, and the customized values of these
+variables may be lost.  In order to avoid this problem, you should set
+them in the `configure' command line, using `VAR=value'.  For example:
+
+     ./configure CC=/usr/local2/bin/gcc
+
+causes the specified `gcc' to be used as the C compiler (unless it is
+overridden in the site shell script).
+
+Unfortunately, this technique does not work for `CONFIG_SHELL' due to
+an Autoconf bug.  Until the bug is fixed you can use this workaround:
+
+     CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
+
+`configure' Invocation
+======================
+
+`configure' recognizes the following options to control how it operates.
+
+`--help'
+`-h'
+     Print a summary of the options to `configure', and exit.
+
+`--version'
+`-V'
+     Print the version of Autoconf used to generate the `configure'
+     script, and exit.
+
+`--cache-file=FILE'
+     Enable the cache: use and save the results of the tests in FILE,
+     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     disable caching.
+
+`--config-cache'
+`-C'
+     Alias for `--cache-file=config.cache'.
+
+`--quiet'
+`--silent'
+`-q'
+     Do not print messages saying which checks are being made.  To
+     suppress all normal output, redirect it to `/dev/null' (any error
+     messages will still be shown).
+
+`--srcdir=DIR'
+     Look for the package's source code in directory DIR.  Usually
+     `configure' can determine that directory automatically.
+
+`configure' also accepts some other, not widely useful, options.  Run
+`configure --help' for more details.
+
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..1c75e2b
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,19 @@
+MAINTAINERCLEANFILES = \
+	Makefile.in \
+	aclocal.m4 \
+	compile \
+	config.guess \
+	config.h.in \
+	config.sub \
+	configure \
+	depcomp \
+	install-sh \
+	ltmain.sh \
+	missing
+
+SUBDIRS = src
+
+EXTRA_DIST = \
+	README \
+	AUTHORS \
+	COPYING
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/NEWS
diff --git a/README b/README
new file mode 100644
index 0000000..524425d
--- /dev/null
+++ b/README
@@ -0,0 +1,17 @@
+                         LIGHT MEDIA SCANNER
+                         ===================
+
+Lightweight media scanner meant to be used in not-so-powerful devices,
+like embedded systems or old machines.
+
+Provides an optimized way to recursively scan directories, handling
+the parser in a child process, avoiding breaks of the main process
+when parsers break (quite common with such bad libs and tags).
+
+Parsers are plugins in the form of shared objects, so it's easy to add
+new without having to recompiling the scanner.
+
+The scanner will use SQLite3 to store file-mtime association, avoiding
+parsing files that are already up-to-date. This SQLite connection and
+the file id within the master table 'files' are handled to plugins for
+relationship with other tables.
diff --git a/autogen.sh b/autogen.sh
new file mode 100755
index 0000000..5bbd4d9
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+rm -rf autom4te.cache
+rm -f aclocal.m4 ltmain.sh
+
+echo "Running aclocal..." ; aclocal $ACLOCAL_FLAGS -I m4 || exit 1
+echo "Running autoheader..." ; autoheader || exit 1
+echo "Running autoconf..." ; autoconf || exit 1
+echo "Running libtoolize..." ; (libtoolize --copy --automake || glibtoolize --automake) || exit 1
+echo "Running automake..." ; automake --add-missing --copy --gnu || exit 1
+
+if [ -z "$NOCONFIGURE" ]; then
+	./configure "$@"
+fi
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..33c1d65
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,43 @@
+AC_INIT(lightmediascanner, 0.1.0.1, gustavo.barbieri@openbossa.org)
+AC_PREREQ(2.52)
+AC_CONFIG_SRCDIR(configure.ac)
+AC_CANONICAL_BUILD
+AC_CANONICAL_HOST
+AC_ISC_POSIX
+
+AM_INIT_AUTOMAKE(1.6 dist-bzip2)
+AM_CONFIG_HEADER(config.h)
+
+AC_PROG_CC
+AM_PROG_CC_STDC
+AM_PROG_CC_C_O
+AC_HEADER_STDC
+AC_C_CONST
+
+define([AC_LIBTOOL_LANG_CXX_CONFIG], [:])dnl
+define([AC_LIBTOOL_LANG_F77_CONFIG], [:])dnl
+AC_PROG_LIBTOOL
+
+VMAJ=`echo $PACKAGE_VERSION | awk -F. '{printf("%s", $1);}'`
+VMIN=`echo $PACKAGE_VERSION | awk -F. '{printf("%s", $2);}'`
+VMIC=`echo $PACKAGE_VERSION | awk -F. '{printf("%s", $3);}'`
+SNAP=`echo $PACKAGE_VERSION | awk -F. '{printf("%s", $4);}'`
+version_info=`expr $VMAJ + $VMIN`":$VMIC:$VMIN"
+AC_SUBST(version_info)
+
+pluginsdir="${libdir}/lightmediascanner/plugins"
+
+AC_SUBST(pluginsdir)
+AS_AC_EXPAND(PLUGINSDIR, $pluginsdir)
+AC_DEFINE_UNQUOTED(PLUGINSDIR, ["$PLUGINSDIR"], [Where plugins are installed.])
+
+AC_CHECK_FUNCS(realpath)
+
+AC_OUTPUT([
+Makefile
+src/Makefile
+src/bin/Makefile
+src/lib/Makefile
+src/plugins/Makefile
+src/plugins/dummy/Makefile
+])
diff --git a/m4/as-expand.m4 b/m4/as-expand.m4
new file mode 100644
index 0000000..7b7e4a8
--- /dev/null
+++ b/m4/as-expand.m4
@@ -0,0 +1,43 @@
+dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
+dnl
+dnl example
+dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
+dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
+
+AC_DEFUN([AS_AC_EXPAND],
+[
+  EXP_VAR=[$1]
+  FROM_VAR=[$2]
+
+  dnl first expand prefix and exec_prefix if necessary
+  prefix_save=$prefix
+  exec_prefix_save=$exec_prefix
+
+  dnl if no prefix given, then use /usr/local, the default prefix
+  if test "x$prefix" = "xNONE"; then
+    prefix=$ac_default_prefix
+  fi
+  dnl if no exec_prefix given, then use prefix
+  if test "x$exec_prefix" = "xNONE"; then
+    exec_prefix=$prefix
+  fi
+
+  full_var="$FROM_VAR"
+  dnl loop until it doesn't change anymore
+  while true; do
+    new_full_var="`eval echo $full_var`"
+    dnl if test "x$new_full_var" = "x$full_var"; then
+    if test "x${new_full_var:0:1}" != "x\$"; then
+        break;
+    fi
+    full_var=$new_full_var
+  done
+
+  dnl clean up
+  full_var=$new_full_var
+  AC_SUBST([$1], "$full_var")
+
+  dnl restore prefix and exec_prefix
+  prefix=$prefix_save
+  exec_prefix=$exec_prefix_save
+])
diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..e55545e
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,3 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+SUBDIRS = lib bin plugins
diff --git a/src/bin/.gitignore b/src/bin/.gitignore
new file mode 100644
index 0000000..9daeafb
--- /dev/null
+++ b/src/bin/.gitignore
@@ -0,0 +1 @@
+test
diff --git a/src/bin/Makefile.am b/src/bin/Makefile.am
new file mode 100644
index 0000000..4f46965
--- /dev/null
+++ b/src/bin/Makefile.am
@@ -0,0 +1,17 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib
+
+noinst_PROGRAMS = \
+	test
+
+
+test_SOURCES = \
+	test.c
+
+test_LDADD = \
+	$(top_builddir)/src/lib/liblightmediascanner.la
+
+test_DEPENDENCIES = \
+	$(top_builddir)/src/lib/liblightmediascanner.la
diff --git a/src/bin/test.c b/src/bin/test.c
new file mode 100644
index 0000000..57636d1
--- /dev/null
+++ b/src/bin/test.c
@@ -0,0 +1,59 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <lightmediascanner.h>
+#include <stdio.h>
+
+void
+usage(const char *prgname)
+{
+    fprintf(stderr,
+            "Usage:\n"
+            "\t%s <parser> <scan-path>\n"
+            "\n",
+            prgname);
+}
+
+int
+main(int argc, char *argv[])
+{
+    char *parser_name, *scan_path;
+    lms_t *lms;
+    lms_plugin_t *parser;
+
+    if (argc < 3) {
+        usage(argv[0]);
+        return 1;
+    }
+
+    parser_name = argv[1];
+    scan_path = argv[2];
+
+    lms = lms_new();
+    if (!lms) {
+        fprintf(stderr, "ERROR: could not create light media scanner.\n");
+        return -1;
+    }
+
+    parser = lms_parser_find_and_add(lms, parser_name);
+    if (!parser) {
+        fprintf(stderr, "ERROR: could not create parser \"%s\".\n",
+                parser_name);
+        lms_free(lms);
+        return -2;
+    }
+
+    if (lms_process(lms, scan_path) != 0) {
+        fprintf(stderr, "ERROR: processing \"%s\".\n", scan_path);
+        lms_free(lms);
+        return -3;
+    }
+
+    if (lms_free(lms) != 0) {
+        fprintf(stderr, "ERROR: could not close light media scanner.\n");
+        return -4;
+    }
+
+    return 0;
+}
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
new file mode 100644
index 0000000..0d548fd
--- /dev/null
+++ b/src/lib/Makefile.am
@@ -0,0 +1,11 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib
+
+include_HEADERS = lightmediascanner.h lightmediascanner_plugin.h
+
+lib_LTLIBRARIES = liblightmediascanner.la
+
+liblightmediascanner_la_SOURCES = lightmediascanner.c
+liblightmediascanner_la_LIBADD = -ldl
+liblightmediascanner_la_LDFLAGS = -version-info @version_info@
diff --git a/src/lib/lightmediascanner.c b/src/lib/lightmediascanner.c
new file mode 100644
index 0000000..5a44197
--- /dev/null
+++ b/src/lib/lightmediascanner.c
@@ -0,0 +1,756 @@
+/**
+ * Copyright (C) 2007 by INdT
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * @author Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <limits.h>
+#include <signal.h>
+#include <poll.h>
+#include <dlfcn.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lightmediascanner.h"
+#include "lightmediascanner_plugin.h"
+
+#define PATH_SIZE PATH_MAX
+#define SLAVE_TIMEOUT 1000
+
+struct fds {
+    int r;
+    int w;
+};
+
+/* info to be carried along lms_process() */
+struct pinfo {
+    struct fds master;
+    struct fds slave;
+    struct pollfd poll;
+    lms_t *lms;
+    pid_t child;
+};
+
+struct parser {
+    lms_plugin_t *plugin;
+    void *dl_handle;
+    char *so_path;
+};
+
+struct lms {
+    struct parser *parsers;
+    int n_parsers;
+    unsigned int is_processing:1;
+};
+
+/***********************************************************************
+ * Master-Slave communication.
+ ***********************************************************************/
+
+static int
+_master_send_path(const struct fds *master, int plen, int dlen, const char *p)
+{
+    int lengths[2];
+
+    lengths[0] = plen;
+    lengths[1] = dlen;
+
+    if (write(master->w, lengths, sizeof(lengths)) < 0) {
+        perror("write");
+        return -1;
+    }
+
+    if (write(master->w, p, plen) < 0) {
+        perror("write");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int
+_master_send_finish(const struct fds *master)
+{
+    const int lengths[2] = {-1, -1};
+
+    if (write(master->w, lengths, sizeof(lengths)) < 0) {
+        perror("write");
+        return -1;
+    }
+    return 0;
+}
+
+static int
+_master_recv_reply(const struct fds *master, struct pollfd *pfd, int *reply)
+{
+    int r;
+
+    r = poll(pfd, 1, SLAVE_TIMEOUT);
+    if (r < 0) {
+        perror("poll");
+        return -1;
+    }
+
+    if (r == 0)
+        return 1;
+
+    if (read(master->r, reply, sizeof(*reply)) != sizeof(*reply)) {
+        perror("read");
+        return -2;
+    }
+
+    return 0;
+}
+
+static int
+_slave_send_reply(const struct fds *slave, int reply)
+{
+    if (write(slave->w, &reply, sizeof(reply)) == 0) {
+        perror("write");
+        return -1;
+    }
+    return 0;
+}
+
+static int
+_slave_recv_path(const struct fds *slave, int *plen, int *dlen, char *path)
+{
+    int lengths[2], r;
+
+    r = read(slave->r, lengths, sizeof(lengths));
+    if (r != sizeof(lengths)) {
+        perror("read");
+        return -1;
+    }
+    *plen = lengths[0];
+    *dlen = lengths[1];
+
+    if (*plen == -1)
+        return 0;
+
+    if (*plen > PATH_SIZE) {
+        fprintf(stderr, "ERROR: path too long (%d/%d)\n", *plen, PATH_SIZE);
+        return -2;
+    }
+
+    r = read(slave->r, path, *plen);
+    if (r != *plen) {
+        fprintf(stderr, "ERROR: could not read whole path %d/%d\n", r, *plen);
+        return -3;
+    }
+
+    path[*plen] = 0;
+    return 0;
+}
+
+
+/***********************************************************************
+ * Slave-side.
+ ***********************************************************************/
+
+static int
+_slave_work(lms_t *lms, struct fds *fds)
+{
+    int r, len, base;
+    char path[PATH_SIZE];
+
+    while (((r = _slave_recv_path(fds, &len, &base, path)) == 0) && len > 0) {
+        int i;
+
+        for (i = 0; i < lms->n_parsers; i++) {
+            lms_plugin_t *plugin;
+
+            plugin = lms->parsers[i].plugin;
+            plugin->parse(plugin, path, len, base);
+        }
+        _slave_send_reply(fds, 0);
+    }
+
+    return r;
+}
+
+
+/***********************************************************************
+ * Master-side.
+ ***********************************************************************/
+
+static int
+_consume_garbage(struct pollfd *pfd)
+{
+    int r;
+
+    while ((r = poll(pfd, 1, 0)) > 0) {
+        if (pfd->revents & (POLLERR | POLLHUP | POLLNVAL))
+            return 0;
+        else if (pfd->revents & POLLIN) {
+            char c;
+
+            read(pfd->fd, &c, sizeof(c));
+        }
+    }
+
+    return r;
+}
+
+static int
+_close_fds(struct fds *fds)
+{
+    int r;
+
+    r = 0;
+    if (close(fds->r) != 0) {
+        r--;
+        perror("close");
+    }
+
+    if (close(fds->w) != 0) {
+        r--;
+        perror("close");
+    }
+
+    return r;
+}
+
+static int
+_close_pipes(struct pinfo *pinfo)
+{
+    int r;
+
+    r = _close_fds(&pinfo->master);
+    r += _close_fds(&pinfo->slave);
+
+    return r;
+}
+
+static int
+_create_pipes(struct pinfo *pinfo)
+{
+    int fds[2];
+
+    if (pipe(fds) != 0) {
+        perror("pipe");
+        return -1;
+    }
+    pinfo->master.r = fds[0];
+    pinfo->slave.w = fds[1];
+
+    if (pipe(fds) != 0) {
+        perror("pipe");
+        close(pinfo->master.r);
+        close(pinfo->slave.w);
+        return -1;
+    }
+    pinfo->slave.r = fds[0];
+    pinfo->master.w = fds[1];
+
+    pinfo->poll.fd = pinfo->master.r;
+    pinfo->poll.events = POLLIN;
+
+    return 0;
+}
+
+static int
+_create_slave(struct pinfo *pinfo)
+{
+    int r;
+
+    pinfo->child = fork();
+    if (pinfo->child == -1) {
+        perror("fork");
+        return -1;
+    }
+
+    if (pinfo->child > 0)
+        return 0;
+
+    _close_fds(&pinfo->master);
+    nice(19);
+    r = _slave_work(pinfo->lms, &pinfo->slave);
+    lms_free(pinfo->lms);
+    _exit(r);
+    return r; /* shouldn't reach anyway... */
+}
+
+static int
+_waitpid(pid_t pid)
+{
+    int status;
+    pid_t r;
+
+    r = waitpid(pid, &status, 0);
+    if (r > -1)
+        return 0;
+    else
+        perror("waitpid");
+
+    return r;
+}
+
+static int
+_finish_slave(struct pinfo *pinfo)
+{
+    int r;
+
+    if (pinfo->child <= 0)
+        return 0;
+
+    r = _master_send_finish(&pinfo->master);
+    if (r == 0)
+        r = _waitpid(pinfo->child);
+    else {
+        r = kill(pinfo->child, SIGKILL);
+        if (r < 0)
+            perror("kill");
+        else
+            r =_waitpid(pinfo->child);
+    }
+
+    return r;
+}
+
+static int
+_restart_slave(struct pinfo *pinfo)
+{
+    int status;
+
+    if (waitpid(pinfo->child, &status, WNOHANG) > 0) {
+        if (WIFEXITED(status)) {
+            int code;
+
+            code = WEXITSTATUS(status);
+            if (code != 0) {
+                fprintf(stderr, "ERROR: slave returned %d, exit.\n", code);
+                pinfo->child = 0;
+                return -1;
+            }
+        } else {
+            if (WIFSIGNALED(status)) {
+                int code;
+
+                code = WTERMSIG(status);
+                fprintf(stderr, "ERROR: slave was terminated by signal %d.\n",
+                        code);
+            }
+            pinfo->child = 0;
+            return -1;
+        }
+    }
+
+    if (kill(pinfo->child, SIGKILL))
+        perror("kill");
+
+    if (waitpid(pinfo->child, &status, 0) < 0)
+        perror("waitpid");
+
+    _consume_garbage(&pinfo->poll);
+    return _create_slave(pinfo);
+}
+
+static int
+_strcat(int base, char *path, const char *name)
+{
+    int new_len, name_len;
+
+    name_len = strlen(name);
+    new_len = base + name_len;
+
+    if (new_len >= PATH_SIZE) {
+        path[base] = '\0';
+        fprintf(stderr,
+                "ERROR: path concatenation too long %d of %d "
+                "available: \"%s\" + \"%s\"\n", new_len, PATH_SIZE,
+                path, name);
+        return -1;
+    }
+
+    memcpy(path + base, name, name_len + 1);
+
+    return new_len;
+}
+
+static int
+_process_file(struct pinfo *pinfo, int base, char *path, const char *name)
+{
+    int new_len, reply, r;
+
+    new_len = _strcat(base, path, name);
+    if (new_len < 0)
+        return -1;
+
+    if (_master_send_path(&pinfo->master, new_len, base, path) != 0)
+        return -2;
+
+    r = _master_recv_reply(&pinfo->master, &pinfo->poll, &reply);
+    if (r < 0)
+        return -3;
+    else if (r == 1) {
+        reply = 1;
+        fprintf(stderr, "ERROR: slave took too long, restart %d\n",
+                pinfo->child);
+        if (_restart_slave(pinfo) != 0)
+            return -4;
+    }
+
+    return reply;
+}
+
+static int
+_process_dir(struct pinfo *pinfo, int base, char *path, const char *name)
+{
+    DIR *dir;
+    struct dirent *de;
+    int new_len, r;
+
+    new_len = _strcat(base, path, name);
+    if (new_len < 0)
+        return -1;
+    else if (new_len + 1 >= PATH_SIZE) {
+        fprintf(stderr, "ERROR: path too long\n");
+        return -2;
+    }
+
+    dir = opendir(path);
+    if (dir == NULL) {
+        perror("opendir");
+        return -3;
+    }
+
+    path[new_len] = '/';
+    new_len++;
+
+    r = 0;
+    while ((de = readdir(dir)) != NULL) {
+        if (de->d_name[0] == '.')
+            continue;
+        if (de->d_type == DT_REG) {
+            if (_process_file(pinfo, new_len, path, de->d_name) < 0) {
+                path[new_len - 1] = '\0';
+                fprintf(stderr,
+                        "ERROR: unrecoverable error parsing file, "
+                        "exit \"%s\".\n", path);
+                r = -4;
+                goto end;
+            }
+        } else if (de->d_type == DT_DIR || de->d_type == DT_UNKNOWN) {
+            if (_process_dir(pinfo, new_len, path, de->d_name) < 0) {
+                path[new_len - 1] = '\0';
+                fprintf(stderr,
+                        "ERROR: unrecoverable error parsing dir, "
+                        "exit \"%s\".\n", path);
+                r = -4;
+                goto end;
+            }
+        }
+    }
+
+  end:
+    closedir(dir);
+    return r;
+}
+
+
+/***********************************************************************
+ * Plugins handling.
+ ***********************************************************************/
+
+static int
+_parser_load(struct parser *p, const char *so_path)
+{
+    lms_plugin_t *(*plugin_open)(void);
+    char *errmsg;
+
+    memset(p, 0, sizeof(*p));
+
+    p->dl_handle = dlopen(so_path, RTLD_NOW | RTLD_LOCAL);
+    errmsg = dlerror();
+    if (errmsg) {
+        fprintf(stderr, "ERROR: could not dlopen() %s\n", errmsg);
+        return -1;
+    }
+
+    plugin_open = dlsym(p->dl_handle, "lms_plugin_open");
+    errmsg = dlerror();
+    if (errmsg) {
+        fprintf(stderr, "ERROR: could not find plugin entry point %s\n",
+                errmsg);
+        return -2;
+    }
+
+    p->so_path = strdup(so_path);
+    if (!p->so_path) {
+        perror("strdup");
+        return -3;
+    }
+
+    p->plugin = plugin_open();
+    if (!p->plugin) {
+        fprintf(stderr, "ERROR: plugin \"%s\" failed to init.\n", so_path);
+        return -4;
+    }
+
+    return 0;
+}
+
+static int
+_parser_unload(struct parser *p)
+{
+    int r;
+
+    r = 0;
+    if (p->plugin) {
+        if (p->plugin->close(p->plugin) != 0) {
+            fprintf(stderr, "ERROR: plugin \"%s\" failed to deinit.\n",
+                    p->so_path);
+            r -= 1;
+        }
+    }
+
+    if (p->dl_handle) {
+        char *errmsg;
+
+        dlclose(p->dl_handle);
+        errmsg = dlerror();
+        if (errmsg) {
+            fprintf(stderr, "ERROR: could not dlclose() plugin \"%s\": %s\n",
+                    errmsg, p->so_path);
+            r -= 1;
+        }
+    }
+
+    if (p->so_path)
+        free(p->so_path);
+
+    return r;
+}
+
+
+/***********************************************************************
+ * Public API.
+ ***********************************************************************/
+lms_t *
+lms_new(void)
+{
+    return calloc(1, sizeof(lms_t));
+}
+
+int
+lms_free(lms_t *lms)
+{
+    int i;
+
+    if (!lms)
+        return 0;
+
+    if (lms->is_processing)
+        return -1;
+
+    if (lms->parsers) {
+        for (i = 0; i < lms->n_parsers; i++)
+            _parser_unload(lms->parsers + i);
+
+        free(lms->parsers);
+    }
+
+    free(lms);
+    return 0;
+}
+
+lms_plugin_t *
+lms_parser_add(lms_t *lms, const char *so_path)
+{
+    struct parser *parser;
+
+    if (!lms)
+        return NULL;
+
+    if (!so_path)
+        return NULL;
+
+    if (lms->is_processing) {
+        fprintf(stderr, "ERROR: do not add parsers while it's processing.\n");
+        return NULL;
+    }
+
+    lms->parsers = realloc(lms->parsers,
+                           (lms->n_parsers + 1) * sizeof(struct parser));
+    if (!lms->parsers) {
+        perror("realloc");
+        return NULL;
+    }
+
+    parser = lms->parsers + lms->n_parsers;
+    if (_parser_load(parser, so_path) != 0) {
+        _parser_unload(parser);
+        return NULL;
+    }
+
+    lms->n_parsers++;
+    return parser->plugin;
+}
+
+lms_plugin_t *
+lms_parser_find_and_add(lms_t *lms, const char *name)
+{
+    char so_path[PATH_MAX];
+
+    if (!lms)
+        return NULL;
+    if (!name)
+        return NULL;
+
+    snprintf(so_path, sizeof(so_path), "%s/%s.so", PLUGINSDIR, name);
+    return lms_parser_add(lms, so_path);
+}
+
+int
+lms_parser_del(lms_t *lms, lms_plugin_t *handle)
+{
+    int i;
+
+    if (!lms)
+        return -1;
+    if (!handle)
+        return -2;
+    if (!lms->parsers)
+        return -3;
+    if (lms->is_processing) {
+        fprintf(stderr, "ERROR: do not del parsers while it's processing.\n");
+        return -4;
+    }
+
+    for (i = 0; i < lms->n_parsers; i++) {
+        if (lms->parsers[i].plugin == handle) {
+            struct parser *parser;
+
+            parser = lms->parsers + i;
+            _parser_unload(parser);
+            lms->n_parsers--;
+
+            if (lms->n_parsers == 0) {
+                free(lms->parsers);
+                lms->parsers = NULL;
+                return 0;
+            } else {
+                int dif;
+
+                dif = lms->n_parsers - i;
+                if (dif)
+                    lms->parsers = memmove(parser, parser + 1,
+                                           dif * sizeof(struct parser));
+
+                lms->parsers = realloc(lms->parsers,
+                                       lms->n_parsers * sizeof(struct parser));
+                if (!lms->parsers) {
+                    lms->n_parsers = 0;
+                    return -5;
+                }
+
+                return 0;
+            }
+        }
+    }
+
+    return -3;
+}
+
+int
+lms_process(lms_t *lms, const char *top_path)
+{
+    struct pinfo pinfo;
+    int r, len;
+    char path[PATH_SIZE], *bname;
+
+    if (!lms) {
+        r = -1;
+        goto end;
+    }
+
+    if (!top_path) {
+        r = -2;
+        goto end;
+    }
+
+    if (lms->is_processing) {
+        fprintf(stderr, "ERROR: is already processing.\n");
+        r = -3;
+        goto end;
+    }
+
+    if (!lms->parsers) {
+        fprintf(stderr, "ERROR: no plugins registered.\n");
+        r = -4;
+        goto end;
+    }
+
+    pinfo.lms = lms;
+
+    if (_create_pipes(&pinfo) != 0) {
+        r = -5;
+        goto end;
+    }
+
+    if (_create_slave(&pinfo) != 0) {
+        r = -6;
+        goto close_pipes;
+    }
+
+    if (realpath(top_path, path) == NULL) {
+        perror("realpath");
+        r = -7;
+        goto finish_slave;
+    }
+
+    /* search '/' backwards, split dirname and basename, note realpath usage */
+    len = strlen(path);
+    for (; len >= 0 && path[len] != '/'; len--);
+    len++;
+    bname = strdup(path + len);
+    if (bname == NULL) {
+        perror("strdup");
+        r = -8;
+        goto finish_slave;
+    }
+
+    lms->is_processing = 1;
+    r = _process_dir(&pinfo, len, path, bname);
+    lms->is_processing = 0;
+    free(bname);
+
+  finish_slave:
+    _finish_slave(&pinfo);
+  close_pipes:
+    _close_pipes(&pinfo);
+  end:
+    return r;
+}
+
+int
+lms_is_processing(const lms_t *lms)
+{
+    return lms->is_processing;
+}
diff --git a/src/lib/lightmediascanner.h b/src/lib/lightmediascanner.h
new file mode 100644
index 0000000..caa69aa
--- /dev/null
+++ b/src/lib/lightmediascanner.h
@@ -0,0 +1,83 @@
+/**
+ * Copyright (C) 2007 by INdT
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * @author Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
+ */
+
+#ifndef _LIGHTMEDIASCANNER_H_
+#define _LIGHTMEDIASCANNER_H_ 1
+
+#ifdef API
+#undef API
+#endif
+
+#ifdef __GNUC__
+# if __GNUC__ >= 4
+#  define API __attribute__ ((visibility("default")))
+#  define GNUC_NULL_TERMINATED __attribute__((__sentinel__))
+# else
+#  define API
+#  define GNUC_NULL_TERMINATED
+# endif
+# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+#  define GNUC_PURE __attribute__((__pure__))
+#  define GNUC_MALLOC __attribute__((__malloc__))
+#  define GNUC_CONST __attribute__((__const__))
+#  define GNUC_UNUSED __attribute__((__unused__))
+# else
+#  define GNUC_PURE
+#  define GNUC_MALLOC
+#  define GNUC_NORETURN
+#  define GNUC_CONST
+#  define GNUC_UNUSED
+# endif
+# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+#  define GNUC_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#  define GNUC_NON_NULL(...) __attribute__((nonnull(__VA_ARGS__)))
+# else
+#  define GNUC_WARN_UNUSED_RESULT
+#  define GNUC_NON_NULL(...)
+# endif
+#else
+#  define API
+#  define GNUC_NULL_TERMINATED
+#  define GNUC_PURE
+#  define GNUC_MALLOC
+#  define GNUC_CONST
+#  define GNUC_UNUSED
+#  define GNUC_WARN_UNUSED_RESULT
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    typedef struct lms lms_t;
+    typedef struct lms_plugin lms_plugin_t;
+
+    API lms_t *lms_new(void) GNUC_MALLOC GNUC_WARN_UNUSED_RESULT;
+    API int lms_free(lms_t *lms) GNUC_NON_NULL(1);
+    API int lms_process(lms_t *lms, const char *top_path) GNUC_NON_NULL(1, 2);
+    API int lms_is_processing(const lms_t *lms) GNUC_PURE GNUC_NON_NULL(1);
+
+    API lms_plugin_t *lms_parser_add(lms_t *lms, const char *so_path) GNUC_NON_NULL(1, 2);
+    API lms_plugin_t *lms_parser_find_and_add(lms_t *lms, const char *name) GNUC_NON_NULL(1, 2);
+    API int lms_parser_del(lms_t *lms, lms_plugin_t *handle) GNUC_NON_NULL(1, 2);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _LIGHTMEDIASCANNER_H_ */
diff --git a/src/lib/lightmediascanner_plugin.h b/src/lib/lightmediascanner_plugin.h
new file mode 100644
index 0000000..f27187c
--- /dev/null
+++ b/src/lib/lightmediascanner_plugin.h
@@ -0,0 +1,51 @@
+/**
+ * Copyright (C) 2007 by INdT
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * @author Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
+ */
+
+#ifndef _LIGHTMEDIASCANNER_PLUGIN_H_
+#define _LIGHTMEDIASCANNER_PLUGIN_H_ 1
+
+#ifdef API
+#undef API
+#endif
+
+#ifdef __GNUC__
+# if __GNUC__ >= 4
+#  define API __attribute__ ((visibility("default")))
+# else
+#  define API
+# endif
+#else
+#  define API
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    struct lms_plugin {
+        const char *name;
+        int (*parse)(struct lms_plugin *p, const char *path, int len, int base);
+        int (*close)(struct lms_plugin *p);
+    };
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _LIGHTMEDIASCANNER_PLUGIN_H_ */
diff --git a/src/plugins/Makefile.am b/src/plugins/Makefile.am
new file mode 100644
index 0000000..75ef8ac
--- /dev/null
+++ b/src/plugins/Makefile.am
@@ -0,0 +1,3 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+SUBDIRS = dummy
diff --git a/src/plugins/dummy/Makefile.am b/src/plugins/dummy/Makefile.am
new file mode 100644
index 0000000..7af4e97
--- /dev/null
+++ b/src/plugins/dummy/Makefile.am
@@ -0,0 +1,10 @@
+MAINTAINERCLEANFILES = Makefile.in
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_srcdir)/src/plugins/dummy
+
+pkgdir = $(pluginsdir)
+pkg_LTLIBRARIES = dummy.la
+dummy_la_SOURCES = dummy.c
+dummy_la_DEPENDENCIES = $(top_builddir)/config.h
+dummy_la_LIBADD = $(top_builddir)/src/lib/liblightmediascanner.la
+dummy_la_LDFLAGS = -module -avoid-version
diff --git a/src/plugins/dummy/dummy.c b/src/plugins/dummy/dummy.c
new file mode 100644
index 0000000..3b94905
--- /dev/null
+++ b/src/plugins/dummy/dummy.c
@@ -0,0 +1,91 @@
+/**
+ * Copyright (C) 2007 by INdT
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * @author Gustavo Sverzut Barbieri <gustavo.barbieri@openbossa.org>
+ */
+
+/**
+ * @brief
+ *
+ * Dummy plugin demonstrating the basic lightmediascanner_plugin API,
+ * it just write paths to /tmp/dummy.log.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define _XOPEN_SOURCE 600
+#include <lightmediascanner_plugin.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static const char _name[] = "dummy";
+
+struct plugin {
+    struct lms_plugin plugin;
+    int fd;
+};
+
+static int
+_parse(struct lms_plugin *p, const char *path, int len, int base)
+{
+    struct plugin *plugin = (struct plugin *)p;
+
+    write(plugin->fd, path, len);
+    write(plugin->fd, "\n", 1);
+    return 0;
+}
+
+static int
+_close(struct lms_plugin *p)
+{
+    struct plugin *plugin = (struct plugin *)p;
+
+    if (close(plugin->fd) != 0)
+        perror("close");
+
+    free(plugin);
+    return 0;
+}
+
+API struct lms_plugin *
+lms_plugin_open(void)
+{
+    struct plugin *plugin;
+    char logfile[PATH_MAX];
+
+    snprintf(logfile, sizeof(logfile), "/tmp/dummy-%d.log", getuid());
+
+    plugin = malloc(sizeof(*plugin));
+    plugin->plugin.name = _name;
+    plugin->plugin.parse = _parse;
+    plugin->plugin.close = _close;
+    plugin->fd = open(logfile, O_WRONLY | O_CREAT, 0600);
+    if (plugin->fd < 0) {
+        perror("open");
+        free(plugin);
+        return NULL;
+    }
+
+    return (struct lms_plugin *)plugin;
+}