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/***
This file is part of PulseAudio.
Copyright 2009 Lennart Poettering
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 2.1 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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <pulse/xmalloc.h>
#include <pulsecore/module.h>
#include <pulsecore/core.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulse/mainloop-api.h>
#include <pulsecore/core-error.h>
#include <pulsecore/start-child.h>
#include "stdin-util.h"
int fill_buf(struct userdata *u) {
ssize_t r;
pa_assert(u);
if (u->buf_fill >= BUF_MAX) {
pa_log("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 += (size_t) r;
return 0;
}
int read_byte(struct userdata *u) {
int ret;
pa_assert(u);
if (u->buf_fill < 1)
if (fill_buf(u) < 0)
return -1;
ret = u->buf[0];
pa_assert(u->buf_fill > 0);
u->buf_fill--;
memmove(u->buf, u->buf+1, u->buf_fill);
return ret;
}
char *read_string(struct userdata *u) {
pa_assert(u);
for (;;) {
char *e;
if ((e = memchr(u->buf, 0, u->buf_fill))) {
char *ret = pa_xstrdup(u->buf);
u->buf_fill -= (size_t) (e - u->buf +1);
memmove(u->buf, e+1, u->buf_fill);
return ret;
}
if (fill_buf(u) < 0)
return NULL;
}
}
void unload_one_module(struct pa_module_info *m, unsigned i) {
struct userdata *u;
pa_assert(m);
pa_assert(i < m->n_items);
u = m->userdata;
if (m->items[i].index == PA_INVALID_INDEX)
return;
pa_log_debug("Unloading module #%i", m->items[i].index);
pa_module_unload_by_index(u->core, m->items[i].index, true);
m->items[i].index = PA_INVALID_INDEX;
pa_xfree(m->items[i].name);
pa_xfree(m->items[i].args);
m->items[i].name = m->items[i].args = NULL;
}
void unload_all_modules(struct pa_module_info *m) {
unsigned i;
pa_assert(m);
for (i = 0; i < m->n_items; i++)
unload_one_module(m, i);
m->n_items = 0;
}
void load_module(
struct pa_module_info *m,
unsigned i,
const char *name,
const char *args,
bool is_new) {
struct userdata *u;
pa_module *mod;
pa_assert(m);
pa_assert(name);
pa_assert(args);
u = m->userdata;
if (!is_new) {
if (m->items[i].index != PA_INVALID_INDEX &&
pa_streq(m->items[i].name, name) &&
pa_streq(m->items[i].args, args))
return;
unload_one_module(m, i);
}
pa_log_debug("Loading module '%s' with args '%s' due to GConf/GSettings configuration.", name, args);
m->items[i].name = pa_xstrdup(name);
m->items[i].args = pa_xstrdup(args);
m->items[i].index = PA_INVALID_INDEX;
if (pa_module_load(&mod, u->core, name, args) < 0) {
pa_log("pa_module_load() failed");
return;
}
m->items[i].index = mod->index;
}
void module_info_free(void *p) {
struct pa_module_info *m = p;
pa_assert(m);
unload_all_modules(m);
pa_xfree(m->name);
pa_xfree(m);
}
int handle_event(struct userdata *u) {
int opcode;
int ret = 0;
do {
if ((opcode = read_byte(u)) < 0) {
if (errno == EINTR || errno == EAGAIN)
break;
goto fail;
}
switch (opcode) {
case '!':
/* The helper tool is now initialized */
ret = 1;
break;
case '+': {
char *name;
struct pa_module_info *m;
unsigned i, j;
if (!(name = read_string(u)))
goto fail;
if (!(m = pa_hashmap_get(u->module_infos, name))) {
m = pa_xnew(struct pa_module_info, 1);
m->userdata = u;
m->name = name;
m->n_items = 0;
pa_hashmap_put(u->module_infos, m->name, m);
} else
pa_xfree(name);
i = 0;
while (i < MAX_MODULES) {
char *module, *args;
if (!(module = read_string(u))) {
if (i > m->n_items) m->n_items = i;
goto fail;
}
if (!*module) {
pa_xfree(module);
break;
}
if (!(args = read_string(u))) {
pa_xfree(module);
if (i > m->n_items) m->n_items = i;
goto fail;
}
load_module(m, i, module, args, i >= m->n_items);
i++;
pa_xfree(module);
pa_xfree(args);
}
/* Unload all removed modules */
for (j = i; j < m->n_items; j++)
unload_one_module(m, j);
m->n_items = i;
break;
}
case '-': {
char *name;
if (!(name = read_string(u)))
goto fail;
pa_hashmap_remove_and_free(u->module_infos, name);
pa_xfree(name);
break;
}
}
} while (u->buf_fill > 0 && ret == 0);
return ret;
fail:
pa_log("Unable to read or parse data from client.");
return -1;
}
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;
if (handle_event(u) < 0) {
if (u->io_event) {
u->core->mainloop->io_free(u->io_event);
u->io_event = NULL;
}
pa_module_unload_request(u->module, true);
}
}
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