/*
- * Copyright (C) 2007-2012 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include "signal.h"
#include "fd.h"
#include "mood.h"
+#include "sideband.h"
#include "command.h"
/** The osl tables used by afs. \sa blob.c. */
static struct signal_task signal_task_struct;
static enum play_mode current_play_mode;
-static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
+static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
/**
* A random number used to "authenticate" the connection.
* area is written to the command socket.
*
* The afs process accepts connections on the command socket and reads the
- * shared memory id, attaches the corresponing area, calls the given handler to
+ * shared memory id, attaches the corresponding area, calls the given handler to
* perform the desired action and to optionally compute a result.
*
* The result and a \p callback_result structure is then written to another
/**
* Structure embedded in the result of a callback.
*
- * If the callback produced a result, an instance of that structure is embeeded
+ * If the callback produced a result, an instance of that structure is embedded
* into the shared memory area holding the result, mainly to let the command
* handler know the size of the result.
*
struct callback_result {
/** The number of bytes of the result. */
size_t result_size;
+ /** The band designator (loglevel for the result). */
+ uint8_t band;
};
static int dispatch_result(int result_shmid, callback_result_handler *handler,
{
struct osl_object result;
void *result_shm;
- int ret2, ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
+ /* must attach r/w as result.data might get encrypted in-place. */
+ int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
struct callback_result *cr = result_shm;
if (ret < 0) {
result.data = result_shm + sizeof(*cr);
if (result.size) {
assert(handler);
- ret = handler(&result, private_result_data);
+ ret = handler(&result, cr->band, private_result_data);
if (ret < 0)
PARA_NOTICE_LOG("result handler error: %s\n",
para_strerror(-ret));
return 1;
}
+/**
+ * Result handler for sending data to the para_client process.
+ *
+ * \param result The data to be sent.
+ * \param band The band designator.
+ * \param private Pointer to the command context.
+ *
+ * \return The return value of the underlying call to \ref command.c::send_sb.
+ *
+ * \sa \ref callback_result_handler, \ref command.c::send_sb.
+ */
+int afs_cb_result_handler(struct osl_object *result, uint8_t band,
+ void *private)
+{
+ struct command_context *cc = private;
+
+ assert(cc);
+ if (!result->size)
+ return 1;
+ return send_sb(&cc->scc, result->data, result->size, band, true);
+}
+
static void com_select_callback(int fd, const struct osl_object *query)
{
struct para_buffer pb = {
.max_size = shm_get_shmmax(),
- .private_data = &fd,
- .max_size_handler = pass_buffer_as_shm
+ .private_data = &(struct afs_max_size_handler_data) {
+ .fd = fd,
+ .band = SBD_OUTPUT
+ },
+ .max_size_handler = afs_max_size_handler,
};
char *arg = query->data;
int num_admissible, ret, ret2;
current_mop : "dummy mood", num_admissible);
out:
if (ret2 >= 0 && pb.offset)
- pass_buffer_as_shm(pb.buf, pb.offset, &fd);
+ pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
free(pb.buf);
}
-/**
- * Result handler for sending data to the para_client process.
- *
- * \param result The data to be sent.
- * \param private Pointer to the context.
- *
- * \return The return value of the underlying call to sc_send_bin_buffer().
- *
- * \sa \ref callback_result_handler, \ref sc_send_bin_buffer().
- */
-int sc_send_result(struct osl_object *result, void *private)
-{
- struct command_context *cc = private;
- int ret;
-
- if (!result->size)
- return 1;
- ret = sc_send_bin_buffer(&cc->scc, result->data, result->size);
- if (ret < 0 || ret == result->size)
- return ret;
- return -E_SHORT_WRITE;
-}
-
int com_select(struct command_context *cc)
{
struct osl_object query;
query.data = cc->argv[1];
query.size = strlen(cc->argv[1]) + 1;
return send_callback_request(com_select_callback, &query,
- &sc_send_result, cc);
+ &afs_cb_result_handler, cc);
}
static void init_admissible_files(char *arg)
para_fd_set(st->fd, &s->rfds, &s->max_fileno);
}
-static void afs_signal_post_select(struct sched *s, struct task *t)
+static int afs_signal_post_select(struct sched *s, __a_unused struct task *t)
{
- int signum;
+ int signum, ret;
if (getppid() == 1) {
PARA_EMERG_LOG("para_server died\n");
}
signum = para_next_signal(&s->rfds);
if (signum == 0)
- return;
+ return 0;
if (signum == SIGHUP) {
close_afs_tables();
parse_config_or_die(1);
- t->error = open_afs_tables();
- if (t->error < 0)
- return;
+ ret = open_afs_tables();
+ if (ret < 0)
+ return ret;
init_admissible_files(current_mop);
- return;
+ return 0;
}
PARA_EMERG_LOG("terminating on signal %d\n", signum);
shutdown:
- sched_shutdown(s);
- t->error = -E_AFS_SIGNAL;
+ task_notify_all(s, E_AFS_SIGNAL);
+ return -E_AFS_SIGNAL;
}
static void register_signal_task(struct sched *s)
/**
* Send data as shared memory to a file descriptor.
*
+ * \param fd File descriptor to send the shmid to.
+ * \param band The band designator for this data.
* \param buf The buffer holding the data to be sent.
* \param size The size of \a buf.
- * \param fd_ptr A pointer to the file descriptor.
- *
- * This function is used as the \a max_size handler in a \ref para_buffer
- * structure. If used this way, it is called by \ref para_printf() whenever
- * the buffer passed to para_printf() is about to exceed its maximal size.
*
* This function creates a shared memory area large enough to hold
* the content given by \a buf and \a size and sends the identifier
- * of this area to the file descriptor given by \a fd_ptr.
+ * of this area to the file descriptor \a fd.
+ *
+ * It is called by the AFS max_size handler as well as directly by the AFS
+ * command callbacks to send command output to the command handlers.
*
* \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
* and positive on success.
*/
-int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
+int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
{
- int ret, shmid, fd = *(int *)fd_ptr;
+ int ret, shmid;
void *shm;
struct callback_result *cr;
if (!buf || !size)
return 0;
- ret = shm_new(size + sizeof(struct callback_result));
+ ret = shm_new(size + sizeof(*cr));
if (ret < 0)
return ret;
shmid = ret;
goto err;
cr = shm;
cr->result_size = size;
+ cr->band = band;
memcpy(shm + sizeof(*cr), buf, size);
ret = shm_detach(shm);
if (ret < 0)
/** Shutdown connection if query has not arrived until this many seconds. */
#define AFS_CLIENT_TIMEOUT 3
-static void command_post_select(struct sched *s, struct task *t)
+static int command_post_select(struct sched *s, struct task *t)
{
struct command_task *ct = container_of(t, struct command_task, task);
struct sockaddr_un unix_addr;
struct afs_client *client, *tmp;
int fd, ret;
+ ret = task_get_notification(t);
+ if (ret < 0)
+ return ret;
ret = execute_server_command(&s->rfds);
if (ret < 0) {
PARA_EMERG_LOG("%s\n", para_strerror(-ret));
- sched_shutdown(s);
- return;
+ task_notify_all(s, -ret);
+ return ret;
}
/* Check the list of connected clients. */
list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
if (ret < 0)
PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
if (ret <= 0)
- return;
+ return 0;
ret = mark_fd_nonblocking(fd);
if (ret < 0) {
PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
close(fd);
- return;
+ return 0;
}
client = para_malloc(sizeof(*client));
client->fd = fd;
client->connect_time = *now;
para_list_add(&client->node, &afs_client_list);
+ return 0;
}
static void register_command_task(uint32_t cookie, struct sched *s)
if (ret < 0)
para_printf(&pb, "%s\n", para_strerror(-ret));
if (pb.buf)
- pass_buffer_as_shm(pb.buf, pb.offset, &fd);
+ pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
free(pb.buf);
}
}
}
ret = send_callback_request(create_tables_callback, &query,
- sc_send_result, cc);
- if (ret < 0)
- /* ignore return value */
- sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
+ afs_cb_result_handler, cc);
return ret;
}
flags = ~0U;
if (flags & CHECK_AFT) {
ret = send_callback_request(aft_check_callback, NULL,
- sc_send_result, cc);
+ afs_cb_result_handler, cc);
if (ret < 0)
return ret;
}
if (flags & CHECK_PLAYLISTS) {
ret = send_callback_request(playlist_check_callback,
- NULL, sc_send_result, cc);
+ NULL, afs_cb_result_handler, cc);
if (ret < 0)
return ret;
}
if (flags & CHECK_MOODS) {
ret = send_callback_request(mood_check_callback, NULL,
- sc_send_result, cc);
+ afs_cb_result_handler, cc);
if (ret < 0)
return ret;
}
projects / paraslash.git / blobdiff