add new module "module-gconf" which reads configuration information from gconf. this will be used in my upcoming paconf module

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1150 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 386 insertions, 0 deletions

diff --git a/src/modules/gconf/module-gconf.c b/src/modules/gconf/module-gconf.c
new file mode 100644
index 00000000..30e6292e
--- /dev/null
+++ b/src/modules/gconf/module-gconf.c
@@ -0,0 +1,386 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+ 
+  PulseAudio 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.
+ 
+  PulseAudio 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 PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <pulsecore/module.h>
+#include <pulsecore/core.h>
+#include <pulsecore/llist.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulse/mainloop-api.h>
+#include <pulse/xmalloc.h>
+#include <pulsecore/core-error.h>
+
+#include "module-gconf-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering")
+PA_MODULE_DESCRIPTION("GConf Adapter")
+PA_MODULE_VERSION(PACKAGE_VERSION)
+PA_MODULE_USAGE("")
+
+#define MAX_MODULES 10
+#define BUF_MAX 2048
+
+#undef PA_GCONF_HELPER
+#define PA_GCONF_HELPER "/home/lennart/projects/pulseaudio/src/gconf-helper"
+
+struct module_info {
+    char *name;
+    
+    unsigned n_indexes;
+    uint32_t indexes[MAX_MODULES];
+};
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    
+    pa_hashmap *module_infos;
+
+    pid_t pid;
+
+    int fd;
+    int fd_type;
+    pa_io_event *io_event;
+
+    char buf[BUF_MAX];
+    size_t buf_fill;
+};
+
+static int fill_buf(struct userdata *u) {
+    ssize_t r;
+    assert(u);
+
+    if (u->buf_fill >= BUF_MAX) {
+        pa_log(__FILE__": read buffer overflow");
+        return -1;
+    }
+
+    if ((r = pa_read(u->fd, u->buf + u->buf_fill, BUF_MAX - u->buf_fill, &u->fd_type)) <= 0)
+        return -1;
+
+    u->buf_fill += r;
+    return 0;
+}
+
+static int read_byte(struct userdata *u) {
+    int ret;
+    assert(u);
+
+    if (u->buf_fill < 1)
+        if (fill_buf(u) < 0)
+            return -1;
+
+    ret = u->buf[0];
+    assert(u->buf_fill > 0);
+    u->buf_fill--;
+    memmove(u->buf, u->buf+1, u->buf_fill);
+    return ret;
+}
+
+static char *read_string(struct userdata *u) {
+    assert(u);
+
+    for (;;) {
+        char *e;
+        
+        if ((e = memchr(u->buf, 0, u->buf_fill))) {
+            char *ret = pa_xstrdup(u->buf);
+            u->buf_fill -= e - u->buf +1;
+            memmove(u->buf, e+1, u->buf_fill);
+            return ret;
+        }
+
+        if (fill_buf(u) < 0)
+            return NULL;
+    }
+}
+
+static void unload_modules(struct userdata *u, struct module_info*m) {
+    unsigned i;
+    
+    assert(u);
+    assert(m);
+
+    for (i = 0; i < m->n_indexes; i++) {
+        pa_log_debug(__FILE__": Unloading module #%i", m->indexes[i]);
+        pa_module_unload_by_index(u->core, m->indexes[i]);
+    }
+
+    m->n_indexes = 0;
+}
+
+static void load_module(
+        struct userdata *u,
+        struct module_info *m,
+        const char *module,
+        const char *args) {
+
+    pa_module *mod;
+    
+    assert(u);
+    assert(m);
+    assert(module);
+
+    assert(m->n_indexes < MAX_MODULES);
+
+    pa_log_debug(__FILE__": Loading module '%s' with args '%s' due to GConf configuration.", module, args);
+    
+    if (!(mod = pa_module_load(u->core, module, args))) {
+        pa_log(__FILE__": pa_module_load() failed");
+        return;
+    }
+    
+    m->indexes[m->n_indexes++] = mod->index;
+}
+
+static void module_info_free(void *p, void *userdata) {
+    struct module_info *m = p;
+    struct userdata *u = userdata;
+
+    assert(m);
+    assert(u);
+
+    unload_modules(u, m);
+    pa_xfree(m->name);
+    pa_xfree(m);
+}
+
+static int handle_event(struct userdata *u) {
+    int opcode;
+    int ret = 0;
+
+    do {
+        if ((opcode = read_byte(u)) < 0)
+            goto fail;
+        
+        switch (opcode) {
+            case '!':
+                /* The helper tool is now initialized */
+                ret = 1;
+                break;
+                
+            case '+': {
+                char *name;
+                struct module_info *m;
+                
+                if (!(name = read_string(u)))
+                    goto fail;
+
+                if ((m = pa_hashmap_get(u->module_infos, name))) {
+                    unload_modules(u, m);
+                } else {
+                    m = pa_xnew(struct module_info, 1);
+                    m->name = pa_xstrdup(name);
+                    m->n_indexes = 0;
+                    pa_hashmap_put(u->module_infos, m->name, m);
+                }
+                
+                while (m->n_indexes < MAX_MODULES) {
+                    char *module, *args;
+
+                    if (!(module = read_string(u))) {
+                        pa_xfree(name);
+                        goto fail;
+                    }
+
+                    if (!*module) {
+                        pa_xfree(module);
+                        break;
+                    }
+
+                    if (!(args = read_string(u))) {
+                        pa_xfree(name);
+                        pa_xfree(module);
+                        goto fail;
+                    }
+
+                    load_module(u, m, module, args);
+
+                    pa_xfree(module);
+                    pa_xfree(args);
+                }
+
+                pa_xfree(name);
+                
+                break;
+            }
+                
+            case '-': {
+                char *name;
+                struct module_info *m;
+                
+                if (!(name = read_string(u)))
+                    goto fail;
+
+                if ((m = pa_hashmap_get(u->module_infos, name))) {
+                    pa_hashmap_remove(u->module_infos, name);
+                    module_info_free(m, u);
+                }
+
+                pa_xfree(name);
+                
+                break;
+            }
+        }
+    } while (u->buf_fill > 0 && ret == 0);
+
+    return ret;
+
+fail:
+    pa_log(__FILE__": Unable to read or parse data from client.");
+    return -1;
+}
+
+static void io_event_cb(
+        pa_mainloop_api*a,
+        pa_io_event* e,
+        int fd,
+        pa_io_event_flags_t events,
+        void *userdata) {
+
+    struct userdata *u = userdata;
+
+    handle_event(u);
+}
+
+static int start_client(const char *n, pid_t *pid) {
+    pid_t child;
+    int pipe_fds[2] = { -1, -1 };
+
+    if (pipe(pipe_fds) < 0) {
+        pa_log(__FILE__": pipe() failed: %s", pa_cstrerror(errno));
+        goto fail;
+    }
+    
+    if ((child = fork()) == (pid_t) -1) {
+        pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
+        goto fail;
+    } else if (child != 0) {
+
+        /* Parent */
+        close(pipe_fds[1]);
+
+        if (pid)
+            *pid = child;
+
+        return pipe_fds[0];
+    } else {
+
+        /* child */
+
+        close(pipe_fds[0]);
+        dup2(pipe_fds[1], 1);
+
+        if (pipe_fds[1] != 1)
+            close(pipe_fds[1]);
+
+        execl(n, n, NULL);
+        _exit(1);
+    }
+    
+fail:
+    if (pipe_fds[0] >= 0)
+        close(pipe_fds[0]);
+
+    if (pipe_fds[1] >= 0)
+        close(pipe_fds[1]);
+    
+    return -1;
+}
+
+int pa__init(pa_core *c, pa_module*m) {
+    struct userdata *u;
+    int r;
+
+    u = pa_xnew(struct userdata, 1);
+    u->core = c;
+    u->module = m;
+    u->module_infos = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
+    u->pid = (pid_t) -1;
+    u->fd = -1;
+    u->fd_type = 0;
+    u->io_event = NULL;
+    u->buf_fill = 0;
+    
+    if ((u->fd = start_client(PA_GCONF_HELPER, &u->pid)) < 0)
+        goto fail;
+    
+    u->io_event = c->mainloop->io_new(
+            c->mainloop,
+            u->fd,
+            PA_IO_EVENT_INPUT,
+            io_event_cb,
+            u);
+    
+    do {
+        if ((r = handle_event(u)) < 0)
+            goto fail;
+
+        /* Read until the client signalled us that it is ready with
+         * initialization */
+    } while (r != 1);
+        
+    return 0;
+
+fail:
+    pa__done(c, m);
+    return -1;
+}
+
+void pa__done(pa_core *c, pa_module*m) {
+    struct userdata *u;
+
+    assert(c);
+    assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    if (u->io_event)
+        c->mainloop->io_free(u->io_event);
+
+    if (u->fd >= 0)
+        close(u->fd);
+
+    if (u->pid != (pid_t) -1) {
+        kill(u->pid, SIGTERM);
+        waitpid(u->pid, NULL, 0);
+    }
+
+    if (u->module_infos)
+        pa_hashmap_free(u->module_infos, module_info_free, u);
+
+    pa_xfree(u);
+}
+