configure.ac: Fix mysql configuration
[paraslash.git] / audiod.c
index 9e001c6..bd87cf8 100644 (file)
--- a/audiod.c
+++ b/audiod.c
 #include "filter.h"
 #include "grab_client.cmdline.h"
 #include "grab_client.h"
-#include "ringbuffer.h"
 
 #include "error.h"
 #include "audiod.h"
 #include "net.h"
 #include "daemon.h"
 #include "string.h"
+#include "fd.h"
 
 /** define the array of error lists needed by para_audiod */
 INIT_AUDIOD_ERRLISTS;
@@ -131,9 +131,7 @@ static int playing, current_decoder = -1,
        sa_time_diff_sign = 1, audiod_socket = -1;
 static char *af_status, /* the audio format announced in server status */
        *socket_name, *hostname;
-/** how many status items to remember */
-#define RINGBUFFER_SIZE 32
-static void *stat_item_ringbuf;
+static char *stat_item_values[NUM_STAT_ITEMS];
 static FILE *logfile;
 static const struct timeval restart_delay = {0, 300 * 1000};
 
@@ -156,11 +154,13 @@ static struct audiod_command cmds[] = {
 .description = "grab the audio stream",
 .synopsis = "-- grab [grab_options]",
 .help =
+
 "grab ('splice') the audio stream at any position in the filter      \n"
-"chain and send that data back to the client. \n"
-"Available options:\n\n"
-GRAB_HELP_TXT
+"chain and send that data back to the client. Try\n"
+"\t para_audioc -- grab -h\n"
+"for the list of available options.\n"
 },
+
 {
 .name = "help",
 .handler = com_help,
@@ -211,11 +211,10 @@ GRAB_HELP_TXT
 .name = "stat",
 .handler = com_stat,
 .description = "print status information",
-.synopsis = "stat",
+.synopsis = "stat [item1 ...]",
 .help =
 
-"Add para_audiod status information to para_server's status information\n"
-"and dump everything to stdout.\n"
+"Dump given status items (all if none given) to stdout.\n"
 
 },
 {
@@ -269,17 +268,7 @@ void para_log(int ll, const char* fmt,...)
 
        if (ll < conf.loglevel_arg)
                return;
-       if (!logfile && conf.logfile_given)
-               logfile = open_log(conf.logfile_arg);
-       if (!logfile && conf.daemon_given)
-               return;
-       if (!logfile) {
-               if (ll < WARNING)
-                       outfd = stdout;
-               else
-                       outfd = stderr;
-       } else
-               outfd = logfile;
+       outfd = logfile? logfile : stderr;
        time(&t1);
        tm = localtime(&t1);
        strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
@@ -302,9 +291,11 @@ static char *get_time_string(struct timeval *newest_stime)
        struct timeval now, diff, adj_stream_start, tmp;
        int total = 0, use_server_time = 1;
 
-       if (!playing)
-               return make_message("%s:", length_seconds?
-                       "" : status_item_list[SI_PLAY_TIME]);
+       if (!playing) {
+               if (length_seconds)
+                       return NULL;
+               return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
+       }
        if (audiod_status == AUDIOD_OFF)
                goto out;
        if (sa_time_diff_sign > 0)
@@ -330,7 +321,7 @@ static char *get_time_string(struct timeval *newest_stime)
                total = 0;
 out:
        return make_message(
-               "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
+               "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
                status_item_list[SI_PLAY_TIME],
                use_server_time? "~" : "",
                total / 60,
@@ -344,12 +335,31 @@ out:
        );
 }
 
-static char *audiod_status_string(void)
+__malloc static char *audiod_status_string(void)
+{
+       const char *status = (audiod_status == AUDIOD_ON)?
+               "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
+       return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
+}
+
+static struct timeval *wstime(void)
+{
+       int i;
+       struct timeval *max = NULL;
+       FOR_EACH_SLOT(i) {
+               struct slot_info *s = &slot[i];
+               if (s->wpid <= 0)
+                       continue;
+               if (max && tv_diff(&s->wstime, max, NULL) <= 0)
+                       continue;
+               max = &s->wstime;
+       }
+       return max;
+}
+__malloc static char *decoder_flags(void)
 {
        int i;
-       struct timeval *newest_stime = NULL;
-       char *ret, *time_string, *uptime_string, *decoder_flags =
-               para_malloc((MAX_STREAM_SLOTS + 1) * sizeof(char));
+       char decoder_flags[MAX_STREAM_SLOTS + 1];
 
        FOR_EACH_SLOT(i) {
                struct slot_info *s = &slot[i];
@@ -361,25 +371,10 @@ static char *audiod_status_string(void)
                if (flag != '0')
                        flag += s->format * 4;
                decoder_flags[i] = flag;
-               if (s->wpid <= 0)
-                       continue;
-               if (newest_stime && tv_diff(&s->wstime, newest_stime, NULL) <= 0)
-                       continue;
-               newest_stime = &s->wstime;
        }
        decoder_flags[MAX_STREAM_SLOTS] = '\0';
-       time_string = get_time_string(newest_stime);
-       uptime_string = uptime_str();
-       ret = make_message("%s:%s\n%s:%s\n%s:%s\n%s",
-               status_item_list[SI_AUDIOD_UPTIME], uptime_string,
-               status_item_list[SI_DECODER_FLAGS], decoder_flags,
-               status_item_list[SI_AUDIOD_STATUS], audiod_status == AUDIOD_ON?
-                       "on" : (audiod_status == AUDIOD_OFF? "off": "sb"),
-               time_string);
-       free(uptime_string);
-       free(decoder_flags);
-       free(time_string);
-       return ret;
+       return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
+               decoder_flags);
 }
 
 static char *configfile_exists(void)
@@ -407,13 +402,34 @@ static void setup_signal_handling(void)
 
 static void audiod_status_dump(void)
 {
-       static char *prev_status;
-       char *tmp = audiod_status_string();
-
-       if (!prev_status || strcmp(tmp, prev_status))
-               stat_client_write(tmp);
-       free(prev_status);
-       prev_status = tmp;
+       static char *p_ts, *p_us, *p_as, *p_df;
+       struct timeval *t = wstime();
+       char *us, *tmp = get_time_string(t);
+
+       if (tmp && (!p_ts || strcmp(tmp, p_ts)))
+               stat_client_write(tmp, SI_PLAY_TIME);
+       free(p_ts);
+       p_ts = tmp;
+
+       us = uptime_str();
+       tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
+       free(us);
+       if (!p_us || strcmp(p_us, tmp))
+               stat_client_write(tmp, SI_AUDIOD_UPTIME);
+       free(p_us);
+       p_us = tmp;
+
+       tmp = audiod_status_string();
+       if (!p_as || strcmp(p_as, tmp))
+               stat_client_write(tmp, SI_AUDIOD_STATUS);
+       free(p_as);
+       p_as = tmp;
+
+       tmp = decoder_flags();
+       if (!p_df || strcmp(p_df, tmp))
+               stat_client_write(tmp, SI_DECODER_FLAGS);
+       free(p_df);
+       p_df = tmp;
 }
 
 static void clear_slot(int slot_num)
@@ -546,7 +562,6 @@ static int decoder_running(int format)
 
 static void close_stat_pipe(void)
 {
-       char *msg;
        int i;
 
        if (stat_pipe < 0)
@@ -556,17 +571,18 @@ static void close_stat_pipe(void)
        del_close_on_fork_list(stat_pipe);
        stat_pipe = -1;
        kill_all_decoders();
-       for (i = 0; i < RINGBUFFER_SIZE; i++)
-               free(ringbuffer_add(stat_item_ringbuf, para_strdup(NULL)));
+       for (i = 0; i < NUM_STAT_ITEMS; i++) {
+               free(stat_item_values[i]);
+               stat_item_values[i] = NULL;
+       }
        dump_empty_status();
        length_seconds = 0;
        offset_seconds = 0;
        audiod_status_dump();
        playing = 0;
-       msg = make_message("%s:no connection to para_server\n",
+       stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
                status_item_list[SI_STATUS_BAR]);
-       free(ringbuffer_add(stat_item_ringbuf, msg));
-       stat_client_write(msg);
+       stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 }
 
 static void __noreturn clean_exit(int status, const char *msg)
@@ -593,17 +609,14 @@ __malloc static char *glob_cmd(char *cmd)
        else
                tv_diff(&server_stream_start, &sa_time_diff, &rss);
        tv_add(&rss, &delay, &tmp);
-       replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
+       replacement = make_message("%lu:%lu",
+               (long unsigned)tmp.tv_sec,
+               (long unsigned)tmp.tv_usec);
        ret = s_a_r(cmd, "STREAM_START", replacement);
        free(replacement);
        if (!ret)
                goto out;
        PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
-       {
-       struct timeval now;
-       gettimeofday(&now, NULL);
-       PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
-       }
 out:
        return ret;
 }
@@ -683,7 +696,7 @@ static void start_stream_writer(int slot_num)
        if (a->write_cmd)
                glob = glob_cmd(a->write_cmd);
        if (!glob)
-               glob = para_strdup("para_play");
+               glob = para_strdup("para_write -w alsa");
        PARA_INFO_LOG("starting stream writer: %s\n", glob);
        open_filters(slot_num);
        ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
@@ -695,7 +708,7 @@ static void start_stream_writer(int slot_num)
        s->write_fd = fds[0];
        add_close_on_fork_list(s->write_fd);
        /* we write to this fd in do_select, so we need non-blocking */
-       fcntl(s->write_fd, F_SETFL, O_NONBLOCK);
+       mark_fd_nonblock(s->write_fd);
        gettimeofday(&s->wstime, NULL);
        current_decoder = slot_num;
        activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
@@ -781,26 +794,34 @@ static void compute_time_diff(const struct timeval *status_time)
                count > 10? sign : sign * time_smooth, &diff,
                &tmp);
        sa_time_diff = tmp;
-       PARA_INFO_LOG("time diff (cur/avg): "
-               "%li:%lu/%li:%lu\n",
-               sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
-               sa_time_diff_sign * sa_time_diff.tv_sec,
-               (sa_time_diff.tv_usec + 500)/ 1000);
+       PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
+               sign > 0? "+" : "-",
+               tv2ms(&diff),
+               sa_time_diff_sign ? "+" : "-",
+               tv2ms(&sa_time_diff)
+       );
 }
 
 static void check_stat_line(char *line)
 {
        int itemnum;
        size_t ilen = 0;
-       struct timeval tv;
+       long unsigned sec, usec;
+       char *tmp;
 
+//     PARA_INFO_LOG("line: %s\n", line);
        if (!line)
                return;
-       free(ringbuffer_add(stat_item_ringbuf, para_strdup(line)));
-       stat_client_write(line);
        itemnum = stat_line_valid(line);
-       if (itemnum < 0)
+       if (itemnum < 0) {
+               PARA_WARNING_LOG("invalid status line: %s\n", line);
                return;
+       }
+       tmp = make_message("%s\n", line);
+       stat_client_write(tmp, itemnum);
+       free(tmp);
+       free(stat_item_values[itemnum]);
+       stat_item_values[itemnum] = para_strdup(line);
        ilen = strlen(status_item_list[itemnum]);
        switch (itemnum) {
        case SI_STATUS:
@@ -817,14 +838,16 @@ static void check_stat_line(char *line)
                length_seconds = atoi(line + ilen + 1);
                break;
        case SI_STREAM_START:
-               if (sscanf(line + ilen + 1, "%lu.%lu",
-                               &tv.tv_sec, &tv.tv_usec) == 2)
-                       server_stream_start = tv;
+               if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
+                       server_stream_start.tv_sec = sec;
+                       server_stream_start.tv_usec = usec;
+               }
                break;
        case SI_CURRENT_TIME:
-               if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
-                               &tv.tv_usec) == 2)
+               if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
+                       struct timeval tv = {sec, usec};
                        compute_time_diff(&tv);
+               }
                break;
        }
 }
@@ -929,9 +952,9 @@ static void close_decoder_if_idle(int slot_num)
        clear_slot(slot_num);
 }
 
-static int set_stream_fds(fd_set *wfds)
+static void set_stream_fds(fd_set *wfds, int *max_fileno)
 {
-       int i, max_fileno = -1;
+       int i;
 
        check_timeouts();
        FOR_EACH_SLOT(i) {
@@ -953,12 +976,9 @@ static int set_stream_fds(fd_set *wfds)
                        continue;
                if (!get_loaded_bytes(i))
                        continue;
-               FD_SET(s->write_fd, wfds);
+               para_fd_set(s->write_fd, wfds, max_fileno);
                s->wcheck = 1;
-               max_fileno = MAX(s->write_fd, max_fileno);
        }
-//     PARA_INFO_LOG("return %d\n", max_fileno);
-       return max_fileno;
 }
 
 static int write_audio_data(int slot_num)
@@ -1076,8 +1096,9 @@ static int setup_default_filters(void)
                free(tmp);
                if (ret < 0)
                        goto out;
-               PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
-               ret = add_filter(i, para_strdup("wav"));
+               PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
+                       filters[j].name);
+               ret = add_filter(i, "wav");
                if (ret < 0)
                        goto out;
                PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
@@ -1088,7 +1109,7 @@ out:
 
 static int init_stream_io(void)
 {
-       int i, ret, receiver_num;
+       int i, ret, receiver_num, nf;
        char *cmd;
 
        for (i = 0; i < conf.stream_write_cmd_given; i++) {
@@ -1137,9 +1158,11 @@ static int init_stream_io(void)
        free(cmd);
        /* filters */
        filter_init(filters);
+       nf = PARA_MAX(2,  conf.filter_given) + 1;
+       PARA_INFO_LOG("allocating space for %d filters\n", nf);
        FOR_EACH_AUDIO_FORMAT(i) {
-               afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
-               afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
+               afi[i].filter_conf = para_malloc(nf * sizeof(char *));
+               afi[i].filters = para_malloc(nf * sizeof(struct filter *));
        }
        if (!conf.no_default_filters_given)
                return setup_default_filters();
@@ -1183,7 +1206,7 @@ static int dump_commands(int fd)
 /*
  * command handlers don't close their fd on errors (ret < 0) so that
  * its caller can send an error message. Otherwise (ret >= 0) it's up
- * to each individual command to close the fd if necessary.  
+ * to each individual command to close the fd if necessary.
  */
 
 static int com_help(int fd, int argc, char **argv)
@@ -1221,23 +1244,71 @@ out:
        return ret;
 }
 
-static int com_stat(int fd, __unused int argc, __unused char **argv)
+static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
 {
        int i, ret;
-       char *buf = audiod_status_string();
+       char *buf = NULL;
+       long unsigned mask = ~0LU;
 
-       buf = para_strcat(buf, "\n");
-       for (i = RINGBUFFER_SIZE - 1; i >= 0; i--) {
-               char *tmp, *line = ringbuffer_get(stat_item_ringbuf, i);
-               if (!line)
-                       continue;
-               tmp = make_message("%s\n", line);
-               buf = para_strcat(buf, tmp);
+       if (argc > 1) {
+               mask = 0;
+               for (i = 1; i < argc; i++) {
+                       ret = stat_item_valid(argv[i]);
+                       if (ret < 0)
+                               return ret;
+                       mask |= (1 << ret);
+               }
+       }
+       PARA_INFO_LOG("mask: 0x%lx\n", mask);
+       if (mask & (1 << SI_PLAY_TIME)) {
+               struct timeval *t = wstime();
+               char *ts = get_time_string(t);
+               if (ts) {
+                       ret = client_write(fd, ts);
+                       if (ret < 0)
+                               goto out;
+                       free(ts);
+               }
+       }
+       if (mask & (1 << SI_AUDIOD_UPTIME)) {
+               char *tmp, *us = uptime_str();
+               tmp = make_message("%s:%s\n",
+                       status_item_list[SI_AUDIOD_UPTIME], us);
+               free(us);
+               ret = client_write(fd, tmp);
+               if (ret < 0)
+                       goto out;
                free(tmp);
        }
+       if (mask & (1 << SI_AUDIOD_STATUS)) {
+               char *s = audiod_status_string();
+               ret = client_write(fd, s);
+               if (ret < 0)
+                       goto out;
+               free(s);
+       }
+       if (mask & (1 << SI_DECODER_FLAGS)) {
+               char *df =decoder_flags();
+               ret = client_write(fd, df);
+               if (ret < 0)
+                       goto out;
+               free(df);
+       }
+
+       for (i = 0; i < NUM_STAT_ITEMS; i++) {
+               char *tmp, *v;
+               if (!((1 << i) & mask))
+                       continue;
+               v = stat_item_values[i];
+               tmp = make_message("%s%s%s", buf? buf: "",
+                       v? v : "", v? "\n" : "");
+               free(buf);
+               buf = tmp;
+       }
        ret = client_write(fd, buf);
+out:
        if (ret > 0)
-               ret = stat_client_add(fd);
+               ret = stat_client_add(fd, mask);
        free(buf);
        return ret;
 }
@@ -1268,7 +1339,8 @@ static int com_grab(int fd, int argc, char **argv)
 {
        struct grab_client *gc;
        struct filter_node *fn;
-       int err;
+       int i, err;
+       char *msg;
 
        PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
        gc = grab_client_new(fd, argc, argv, &err);
@@ -1280,40 +1352,49 @@ static int com_grab(int fd, int argc, char **argv)
                activate_grab_client(gc, fn);
        return 1;
 err_out:
-       if (err != -E_GC_HELP_GIVEN)
-               return err;
-       err = client_write(fd, "Usage: para_audioc [audioc_options] -- "
-               "grab [grab_options]\nAvailable options:\n");
-       if (err < 0)
+       if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
                return err;
-       err = client_write(fd, GRAB_HELP_TXT);
+       if (err == -E_GC_HELP_GIVEN) {
+               msg = make_message("%s\n\n", grab_client_args_info_usage);
+               for (i = 0; grab_client_args_info_help[i]; i++) {
+                       char *tmp = make_message("%s%s\n", msg,
+                               grab_client_args_info_help[i]);
+                       free(msg);
+                       msg = tmp;
+               }
+       } else
+               msg = make_message("%s %s\n",
+                       GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
+                       GRAB_CLIENT_CMDLINE_PARSER_VERSION);
+       err = client_write(fd, msg);
+       free(msg);
        if (err < 0)
                return err;
        close(fd);
        return 1;
 }
 
-static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
+static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
 {
        close(fd);
        clean_exit(EXIT_SUCCESS, "terminating on user request");
 }
 
-static int com_on(int fd, __unused int argc, __unused char **argv)
+static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
 {
        audiod_status = AUDIOD_ON;
        close(fd);
        return 1;
 }
 
-static int com_off(int fd, __unused int argc, __unused char **argv)
+static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
 {
        audiod_status = AUDIOD_OFF;
        close(fd);
        return 1;
 }
 
-static int com_sb(int fd, __unused int argc, __unused char **argv)
+static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
 {
        audiod_status = AUDIOD_STANDBY;
        close(fd);
@@ -1337,14 +1418,14 @@ static int com_cycle(int fd, int argc, char **argv)
        return 1;
 }
 
-static int check_perms(struct ucred *c)
+static int check_perms(uid_t uid)
 {
        int i;
 
        if (!conf.user_allow_given)
                return 1;
        for (i = 0; i < conf.user_allow_given; i++)
-               if (c->uid == conf.user_allow_arg[i])
+               if (uid == conf.user_allow_arg[i])
                        return 1;
        return -E_UCRED_PERM;
 }
@@ -1352,7 +1433,6 @@ static int check_perms(struct ucred *c)
 static int handle_connect(void)
 {
        int i, argc, ret, clifd = -1;
-       struct ucred c;
        char *buf = para_malloc(MAXLINE), **argv = NULL;
        struct sockaddr_un unix_addr;
 
@@ -1360,20 +1440,19 @@ static int handle_connect(void)
        if (ret < 0)
                goto out;
        clifd = ret;
-       ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
+       ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
        if (ret < 0)
                goto out;
-       PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
-       buf[ret] = '\0';
-       ret = check_perms(&c);
+       PARA_INFO_LOG("connection from user %i\n",  ret);
+       ret = check_perms(ret);
        if (ret < 0)
                goto out;
-       argc = split_args(buf, &argv, '\n');
-       PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
+       argc = split_args(buf, &argv, "\n");
+       PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
        for (i = 0; cmds[i].name; i++) {
                if (strcmp(cmds[i].name, argv[0]))
                        continue;
-               ret = cmds[i].handler(clifd, argc + 1, argv);
+               ret = cmds[i].handler(clifd, argc, argv);
                goto out;
        }
        ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
@@ -1431,9 +1510,10 @@ static int open_stat_pipe(void)
        return ret;
 }
 
-static int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
+static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
+               int *max_fileno)
 {
-       int i, ret, max = -1;
+       int i, ret;
 
        FOR_EACH_SLOT(i) {
                struct slot_info *s = &slot[i];
@@ -1444,10 +1524,8 @@ static int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
                a = &afi[s->format];
                ret = a->receiver->pre_select(rn, rfds, wfds, tv);
 //             PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
-               max = MAX(max, ret);
+               *max_fileno = PARA_MAX(*max_fileno, ret);
        }
-       return max;
-
 }
 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
 {
@@ -1482,15 +1560,20 @@ static void __noreturn audiod_mainloop(void)
        char status_buf[STRINGSIZE] = "";
        struct timeval tv;
 repeat:
-       FD_ZERO(&rfds);
        FD_ZERO(&wfds);
-       max_fileno = 0;
+       FD_ZERO(&rfds);
+       max_fileno = -1;
+       /* always check signal pipe and the local socket */
+       para_fd_set(signal_pipe, &rfds, &max_fileno);
+       para_fd_set(audiod_socket, &rfds, &max_fileno);
+
        if (audiod_status != AUDIOD_ON)
                kill_all_decoders();
        else if (playing)
                start_current_receiver();
-       max_fileno = set_stream_fds(&wfds);
-       /* stat pipe (read) */
+
+       set_stream_fds(&wfds, &max_fileno);
+       /* status pipe */
        if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
                close_stat_pipe();
        if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
@@ -1498,30 +1581,17 @@ repeat:
                sbo = 0;
                status_buf[0] = '\0';
        }
-       if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
-               FD_SET(stat_pipe, &rfds);
-               max_fileno = MAX(max_fileno, stat_pipe);
-       }
-       /* always check signal pipe */
-       FD_SET(signal_pipe, &rfds);
-       max_fileno = MAX(max_fileno, signal_pipe);
+       if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
+               para_fd_set(stat_pipe, &rfds, &max_fileno);
        /* local socket */
-       if (audiod_socket < 0)
-               audiod_get_socket(); /* doesn't return on errors */
-       FD_SET(audiod_socket, &rfds);
-       max_fileno = MAX(max_fileno, audiod_socket);
        tv.tv_sec = 0;
        tv.tv_usec = 200 * 1000;
-       ret = pre_select(&rfds, &wfds, &tv);
-       max_fileno = MAX(max_fileno, ret);
-       ret = select(max_fileno + 1, &rfds, &wfds, NULL, &tv);
-       if (ret < 0 && errno != EINTR)
-               PARA_ERROR_LOG("select returned %d (%s)\n", ret,
-                       strerror(errno));
-       if (audiod_status != AUDIOD_OFF)
-               audiod_status_dump();
+       audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
+       ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
        if (ret < 0)
                goto repeat;
+       if (audiod_status != AUDIOD_OFF)
+               audiod_status_dump();
        audiod_post_select(ret, &rfds, &wfds);
        /* read status pipe */
        if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
@@ -1578,29 +1648,30 @@ int __noreturn main(int argc, char *argv[])
        valid_fd_012();
        hostname = para_hostname();
        cmdline_parser(argc, argv, &conf);
-       para_drop_privileges(conf.user_arg);
+       para_drop_privileges(conf.user_arg, conf.group_arg);
        cf = configfile_exists();
        if (cf) {
                if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
-                       fprintf(stderr, "parse error in config file\n");
+                       PARA_EMERG_LOG("%s", "parse error in config file\n");
                        exit(EXIT_FAILURE);
                }
        }
+       if (conf.logfile_given)
+               logfile = open_log(conf.logfile_arg);
        log_welcome("para_audiod", conf.loglevel_arg);
        i = init_stream_io();
        if (i < 0) {
-               fprintf(stderr, "init stream io error: %s\n",
-                       PARA_STRERROR(-i));
+               PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
                exit(EXIT_FAILURE);
        }
        server_uptime(UPTIME_SET);
        set_initial_status();
        FOR_EACH_SLOT(i)
                clear_slot(i);
-       stat_item_ringbuf = ringbuffer_new(RINGBUFFER_SIZE);
        init_grabbing();
        setup_signal_handling();
        if (conf.daemon_given)
                daemon_init();
+       audiod_get_socket(); /* doesn't return on errors */
        audiod_mainloop();
 }