btif_sock_thread.c revision aba88aee024266b4b8375d9b27b94469f15c2716 
1/******************************************************************************
2 *
3 *  Copyright (C) 2009-2012 Broadcom Corporation
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 ******************************************************************************/
18
19/************************************************************************************
20 *
21 *  Filename:      btif_sock_thread.c
22 *
23 *  Description:   socket select thread
24 *
25 *
26 ***********************************************************************************/
27
28#include <hardware/bluetooth.h>
29#include <hardware/bt_sock.h>
30
31//bta_jv_co_rfc_data
32#include <stdio.h>
33#include <stdlib.h>
34#include <errno.h>
35#include <features.h>
36#include <string.h>
37#include <sys/types.h>
38#include <sys/socket.h>
39#include <sys/un.h>
40#include <time.h>
41#include <fcntl.h>
42#include <unistd.h>
43#include <signal.h>
44#include <pthread.h>
45#include <ctype.h>
46
47#include <sys/select.h>
48#include <sys/poll.h>
49#include <cutils/sockets.h>
50#include <alloca.h>
51
52#define LOG_TAG "bt_btif_sock"
53#include "btif_common.h"
54#include "btif_util.h"
55
56
57#include "bta_api.h"
58#include "btif_sock.h"
59#include "btif_sock_thread.h"
60#include "btif_sock_util.h"
61
62#define asrt(s) if(!(s)) APPL_TRACE_ERROR("## %s assert %s failed at line:%d ##",__FUNCTION__, #s, __LINE__)
63#define print_events(events) do { \
64    APPL_TRACE_DEBUG("print poll event:%x", events); \
65    if (events & POLLIN) APPL_TRACE_DEBUG(  "   POLLIN "); \
66    if (events & POLLPRI) APPL_TRACE_DEBUG( "   POLLPRI "); \
67    if (events & POLLOUT) APPL_TRACE_DEBUG( "   POLLOUT "); \
68    if (events & POLLERR) APPL_TRACE_DEBUG( "   POLLERR "); \
69    if (events & POLLHUP) APPL_TRACE_DEBUG( "   POLLHUP "); \
70    if (events & POLLNVAL) APPL_TRACE_DEBUG("   POLLNVAL "); \
71    if (events & POLLRDHUP) APPL_TRACE_DEBUG("   POLLRDHUP"); \
72    } while(0)
73
74#define MAX_THREAD 8
75#define MAX_POLL 64
76#define POLL_EXCEPTION_EVENTS (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)
77#define IS_EXCEPTION(e) ((e) & POLL_EXCEPTION_EVENTS)
78#define IS_READ(e) ((e) & POLLIN)
79#define IS_WRITE(e) ((e) & POLLOUT)
80/*cmd executes in socket poll thread */
81#define CMD_WAKEUP       1
82#define CMD_EXIT         2
83#define CMD_ADD_FD       3
84#define CMD_REMOVE_FD    4
85#define CMD_USER_PRIVATE 5
86
87typedef struct {
88    struct pollfd pfd;
89    uint32_t user_id;
90    int type;
91    int flags;
92} poll_slot_t;
93typedef struct {
94    int cmd_fdr, cmd_fdw;
95    int poll_count;
96    poll_slot_t ps[MAX_POLL];
97    int psi[MAX_POLL]; //index of poll slot
98    volatile pthread_t thread_id;
99    btsock_signaled_cb callback;
100    btsock_cmd_cb cmd_callback;
101    int used;
102} thread_slot_t;
103static thread_slot_t ts[MAX_THREAD];
104
105
106
107static void *sock_poll_thread(void *arg);
108static inline void close_cmd_fd(int h);
109
110static inline void add_poll(int h, int fd, int type, int flags, uint32_t user_id);
111
112#if __GLIBC__
113static pthread_mutex_t thread_slot_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
114#else
115static pthread_mutex_t thread_slot_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
116#endif
117
118static inline void set_socket_blocking(int s, int blocking)
119{
120    int opts;
121    opts = fcntl(s, F_GETFL);
122    if (opts<0) APPL_TRACE_ERROR("set blocking (%s)", strerror(errno));
123    if(blocking)
124        opts &= ~O_NONBLOCK;
125    else opts |= O_NONBLOCK;
126    fcntl(s, F_SETFL, opts);
127}
128
129static inline int create_server_socket(const char* name)
130{
131    int s = socket(AF_LOCAL, SOCK_STREAM, 0);
132    APPL_TRACE_DEBUG("covert name to android abstract name:%s", name);
133    if(socket_local_server_bind(s, name, ANDROID_SOCKET_NAMESPACE_ABSTRACT) >= 0)
134    {
135        if(listen(s, 5) == 0)
136        {
137            APPL_TRACE_DEBUG("listen to local socket:%s, fd:%d", name, s);
138            return s;
139        }
140        else APPL_TRACE_ERROR("listen to local socket:%s, fd:%d failed, errno:%d", name, s, errno);
141    }
142    else APPL_TRACE_ERROR("create local socket:%s fd:%d, failed, errno:%d", name, s, errno);
143    close(s);
144    return -1;
145}
146static inline int connect_server_socket(const char* name)
147{
148    int s = socket(AF_LOCAL, SOCK_STREAM, 0);
149    set_socket_blocking(s, TRUE);
150    if(socket_local_client_connect(s, name, ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM) >= 0)
151    {
152        APPL_TRACE_DEBUG("connected to local socket:%s, fd:%d", name, s);
153        return s;
154    }
155    else APPL_TRACE_ERROR("connect to local socket:%s, fd:%d failed, errno:%d", name, s, errno);
156    close(s);
157    return -1;
158}
159static inline int accept_server_socket(int s)
160{
161    struct sockaddr_un client_address;
162    socklen_t clen;
163    int fd = accept(s, (struct sockaddr*)&client_address, &clen);
164    APPL_TRACE_DEBUG("accepted fd:%d for server fd:%d", fd, s);
165    return fd;
166}
167
168static inline int create_thread(void *(*start_routine)(void *), void * arg,
169                                pthread_t * thread_id)
170{
171    pthread_attr_t thread_attr;
172    pthread_attr_init(&thread_attr);
173    pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE);
174    return pthread_create(thread_id, &thread_attr, start_routine, arg);
175}
176
177static void init_poll(int cmd_fd);
178static int alloc_thread_slot()
179{
180    int i;
181    //revserd order to save guard uninitialized access to 0 index
182    for(i = MAX_THREAD - 1; i >=0; i--)
183    {
184        APPL_TRACE_DEBUG("ts[%d].used:%d", i, ts[i].used);
185        if(!ts[i].used)
186        {
187            ts[i].used = 1;
188            return i;
189        }
190    }
191    APPL_TRACE_ERROR("execeeded max thread count");
192    return -1;
193}
194static void free_thread_slot(int h)
195{
196    if(0 <= h && h < MAX_THREAD)
197    {
198        close_cmd_fd(h);
199        ts[h].used = 0;
200    }
201    else APPL_TRACE_ERROR("invalid thread handle:%d", h);
202}
203int btsock_thread_init()
204{
205    static int initialized;
206    APPL_TRACE_DEBUG("in initialized:%d", initialized);
207    if(!initialized)
208    {
209        initialized = 1;
210        int h;
211        for(h = 0; h < MAX_THREAD; h++)
212        {
213            ts[h].cmd_fdr = ts[h].cmd_fdw = -1;
214            ts[h].used = 0;
215            ts[h].thread_id = -1;
216            ts[h].poll_count = 0;
217            ts[h].callback = NULL;
218            ts[h].cmd_callback = NULL;
219        }
220    }
221    return TRUE;
222}
223int btsock_thread_create(btsock_signaled_cb callback, btsock_cmd_cb cmd_callback)
224{
225    int ret = FALSE;
226    asrt(callback || cmd_callback);
227    pthread_mutex_lock(&thread_slot_lock);
228    int h = alloc_thread_slot();
229    pthread_mutex_unlock(&thread_slot_lock);
230    APPL_TRACE_DEBUG("alloc_thread_slot ret:%d", h);
231    if(h >= 0)
232    {
233        init_poll(h);
234        pthread_t thread;
235        int status = create_thread(sock_poll_thread, (void*)(uintptr_t)h, &thread);
236        if (status)
237        {
238            APPL_TRACE_ERROR("create_thread failed: %s", strerror(status));
239            free_thread_slot(h);
240            return -1;
241        }
242
243        ts[h].thread_id = thread;
244        APPL_TRACE_DEBUG("h:%d, thread id:%d", h, ts[h].thread_id);
245        ts[h].callback = callback;
246        ts[h].cmd_callback = cmd_callback;
247    }
248    return h;
249}
250
251/* create dummy socket pair used to wake up select loop */
252static inline void init_cmd_fd(int h)
253{
254    asrt(ts[h].cmd_fdr == -1 && ts[h].cmd_fdw == -1);
255    if(socketpair(AF_UNIX, SOCK_STREAM, 0, &ts[h].cmd_fdr) < 0)
256    {
257        APPL_TRACE_ERROR("socketpair failed: %s", strerror(errno));
258        return;
259    }
260    APPL_TRACE_DEBUG("h:%d, cmd_fdr:%d, cmd_fdw:%d", h, ts[h].cmd_fdr, ts[h].cmd_fdw);
261    //add the cmd fd for read & write
262    add_poll(h, ts[h].cmd_fdr, 0, SOCK_THREAD_FD_RD, 0);
263}
264static inline void close_cmd_fd(int h)
265{
266    if(ts[h].cmd_fdr != -1)
267    {
268        close(ts[h].cmd_fdr);
269        ts[h].cmd_fdr = -1;
270    }
271    if(ts[h].cmd_fdw != -1)
272    {
273        close(ts[h].cmd_fdw);
274        ts[h].cmd_fdw = -1;
275    }
276}
277typedef struct
278{
279    int id;
280    int fd;
281    int type;
282    int flags;
283    uint32_t user_id;
284} sock_cmd_t;
285int btsock_thread_add_fd(int h, int fd, int type, int flags, uint32_t user_id)
286{
287    if(h < 0 || h >= MAX_THREAD)
288    {
289        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
290        return FALSE;
291    }
292    if(ts[h].cmd_fdw == -1)
293    {
294        APPL_TRACE_ERROR("cmd socket is not created. socket thread may not initialized");
295        return FALSE;
296    }
297    if(flags & SOCK_THREAD_ADD_FD_SYNC)
298    {
299        //must executed in socket poll thread
300        if(ts[h].thread_id == pthread_self())
301        {
302            //cleanup one-time flags
303            flags &= ~SOCK_THREAD_ADD_FD_SYNC;
304            add_poll(h, fd, type, flags, user_id);
305            return TRUE;
306        }
307        APPL_TRACE_DEBUG("THREAD_ADD_FD_SYNC is not called in poll thread, fallback to async");
308    }
309    sock_cmd_t cmd = {CMD_ADD_FD, fd, type, flags, user_id};
310    APPL_TRACE_DEBUG("adding fd:%d, flags:0x%x", fd, flags);
311    return send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
312}
313
314bool btsock_thread_remove_fd_and_close(int thread_handle, int fd)
315{
316    if (thread_handle < 0 || thread_handle >= MAX_THREAD)
317    {
318        APPL_TRACE_ERROR("%s invalid thread handle: %d", __func__, thread_handle);
319        return false;
320    }
321    if (fd == -1)
322    {
323        APPL_TRACE_ERROR("%s invalid file descriptor.", __func__);
324        return false;
325    }
326
327    sock_cmd_t cmd = {CMD_REMOVE_FD, fd, 0, 0, 0};
328    return send(ts[thread_handle].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
329}
330
331int btsock_thread_post_cmd(int h, int type, const unsigned char* data, int size, uint32_t user_id)
332{
333    if(h < 0 || h >= MAX_THREAD)
334    {
335        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
336        return FALSE;
337    }
338    if(ts[h].cmd_fdw == -1)
339    {
340        APPL_TRACE_ERROR("cmd socket is not created. socket thread may not initialized");
341        return FALSE;
342    }
343    sock_cmd_t cmd = {CMD_USER_PRIVATE, 0, type, size, user_id};
344    APPL_TRACE_DEBUG("post cmd type:%d, size:%d, h:%d, ", type, size, h);
345    sock_cmd_t* cmd_send = &cmd;
346    int size_send = sizeof(cmd);
347    if(data && size)
348    {
349        size_send = sizeof(cmd) + size;
350        cmd_send = (sock_cmd_t*)alloca(size_send);
351        if(cmd_send)
352        {
353            *cmd_send = cmd;
354            memcpy(cmd_send + 1, data, size);
355        }
356        else
357        {
358            APPL_TRACE_ERROR("alloca failed at h:%d, cmd type:%d, size:%d", h, type, size_send);
359            return FALSE;
360        }
361    }
362    return send(ts[h].cmd_fdw, cmd_send, size_send, 0) == size_send;
363}
364int btsock_thread_wakeup(int h)
365{
366    if(h < 0 || h >= MAX_THREAD)
367    {
368        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
369        return FALSE;
370    }
371    if(ts[h].cmd_fdw == -1)
372    {
373        APPL_TRACE_ERROR("thread handle:%d, cmd socket is not created", h);
374        return FALSE;
375    }
376    sock_cmd_t cmd = {CMD_WAKEUP, 0, 0, 0, 0};
377    return send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
378}
379int btsock_thread_exit(int h)
380{
381    if(h < 0 || h >= MAX_THREAD)
382    {
383        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
384        return FALSE;
385    }
386    if(ts[h].cmd_fdw == -1)
387    {
388        APPL_TRACE_ERROR("cmd socket is not created");
389        return FALSE;
390    }
391    sock_cmd_t cmd = {CMD_EXIT, 0, 0, 0, 0};
392    if(send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd))
393    {
394        pthread_join(ts[h].thread_id, 0);
395        pthread_mutex_lock(&thread_slot_lock);
396        free_thread_slot(h);
397        pthread_mutex_unlock(&thread_slot_lock);
398        return TRUE;
399    }
400    return FALSE;
401}
402static void init_poll(int h)
403{
404    int i;
405    ts[h].poll_count = 0;
406    ts[h].thread_id = -1;
407    ts[h].callback = NULL;
408    ts[h].cmd_callback = NULL;
409    for(i = 0; i < MAX_POLL; i++)
410    {
411        ts[h].ps[i].pfd.fd = -1;
412        ts[h].psi[i] = -1;
413    }
414    init_cmd_fd(h);
415}
416static inline unsigned int flags2pevents(int flags)
417{
418    unsigned int pevents = 0;
419    if(flags & SOCK_THREAD_FD_WR)
420        pevents |= POLLOUT;
421    if(flags & SOCK_THREAD_FD_RD)
422        pevents |= POLLIN;
423    pevents |= POLL_EXCEPTION_EVENTS;
424    return pevents;
425}
426
427static inline void set_poll(poll_slot_t* ps, int fd, int type, int flags, uint32_t user_id)
428{
429    ps->pfd.fd = fd;
430    ps->user_id = user_id;
431    if(ps->type != 0 && ps->type != type)
432        APPL_TRACE_ERROR("poll socket type should not changed! type was:%d, type now:%d", ps->type, type);
433    ps->type = type;
434    ps->flags = flags;
435    ps->pfd.events = flags2pevents(flags);
436    ps->pfd.revents = 0;
437}
438static inline void add_poll(int h, int fd, int type, int flags, uint32_t user_id)
439{
440    asrt(fd != -1);
441    int i;
442    int empty = -1;
443    poll_slot_t* ps = ts[h].ps;
444
445    for(i = 0; i < MAX_POLL; i++)
446    {
447        if(ps[i].pfd.fd == fd)
448        {
449            asrt(ts[h].poll_count < MAX_POLL);
450
451            set_poll(&ps[i], fd, type, flags | ps[i].flags, user_id);
452            return;
453        }
454        else if(empty < 0 && ps[i].pfd.fd == -1)
455            empty = i;
456    }
457    if(empty >= 0)
458    {
459        asrt(ts[h].poll_count < MAX_POLL);
460        set_poll(&ps[empty], fd, type, flags, user_id);
461        ++ts[h].poll_count;
462        return;
463    }
464    APPL_TRACE_ERROR("exceeded max poll slot:%d!", MAX_POLL);
465}
466static inline void remove_poll(int h, poll_slot_t* ps, int flags)
467{
468    if(flags == ps->flags)
469    {
470        //all monitored events signaled. To remove it, just clear the slot
471        --ts[h].poll_count;
472        memset(ps, 0, sizeof(*ps));
473        ps->pfd.fd = -1;
474    }
475    else
476    {
477        //one read or one write monitor event signaled, removed the accordding bit
478        ps->flags &= ~flags;
479        //update the poll events mask
480        ps->pfd.events = flags2pevents(ps->flags);
481    }
482}
483static int process_cmd_sock(int h)
484{
485    sock_cmd_t cmd = {-1, 0, 0, 0, 0};
486    int fd = ts[h].cmd_fdr;
487    if(recv(fd, &cmd, sizeof(cmd), MSG_WAITALL) != sizeof(cmd))
488    {
489        APPL_TRACE_ERROR("recv cmd errno:%d", errno);
490        return FALSE;
491    }
492    APPL_TRACE_DEBUG("cmd.id:%d", cmd.id);
493    switch(cmd.id)
494    {
495        case CMD_ADD_FD:
496            add_poll(h, cmd.fd, cmd.type, cmd.flags, cmd.user_id);
497            break;
498        case CMD_REMOVE_FD:
499            for (int i = 1; i < MAX_POLL; ++i)
500            {
501                poll_slot_t *poll_slot = &ts[h].ps[i];
502                if (poll_slot->pfd.fd == cmd.fd)
503                {
504                    remove_poll(h, poll_slot, poll_slot->flags);
505                    break;
506                }
507            }
508            close(cmd.fd);
509            break;
510        case CMD_WAKEUP:
511            break;
512        case CMD_USER_PRIVATE:
513            asrt(ts[h].cmd_callback);
514            if(ts[h].cmd_callback)
515                ts[h].cmd_callback(fd, cmd.type, cmd.flags, cmd.user_id);
516            break;
517        case CMD_EXIT:
518            return FALSE;
519        default:
520            APPL_TRACE_DEBUG("unknown cmd: %d", cmd.id);
521             break;
522    }
523    return TRUE;
524}
525static void process_data_sock(int h, struct pollfd *pfds, int count)
526{
527    asrt(count <= ts[h].poll_count);
528    int i;
529    for( i= 1; i < ts[h].poll_count; i++)
530    {
531        if(pfds[i].revents)
532        {
533            int ps_i = ts[h].psi[i];
534            asrt(pfds[i].fd == ts[h].ps[ps_i].pfd.fd);
535            uint32_t user_id = ts[h].ps[ps_i].user_id;
536            int type = ts[h].ps[ps_i].type;
537            int flags = 0;
538            print_events(pfds[i].revents);
539            if(IS_READ(pfds[i].revents))
540            {
541                flags |= SOCK_THREAD_FD_RD;
542            }
543            if(IS_WRITE(pfds[i].revents))
544            {
545                flags |= SOCK_THREAD_FD_WR;
546            }
547            if(IS_EXCEPTION(pfds[i].revents))
548            {
549                flags |= SOCK_THREAD_FD_EXCEPTION;
550                //remove the whole slot not flags
551                remove_poll(h, &ts[h].ps[ps_i], ts[h].ps[ps_i].flags);
552            }
553            else if(flags)
554                 remove_poll(h, &ts[h].ps[ps_i], flags); //remove the monitor flags that already processed
555            if(flags)
556                ts[h].callback(pfds[i].fd, type, flags, user_id);
557        }
558    }
559}
560
561static void prepare_poll_fds(int h, struct pollfd* pfds)
562{
563    int count = 0;
564    int ps_i = 0;
565    int pfd_i = 0;
566    asrt(ts[h].poll_count <= MAX_POLL);
567    memset(pfds, 0, sizeof(pfds[0])*ts[h].poll_count);
568    while(count < ts[h].poll_count)
569    {
570        if(ps_i >= MAX_POLL)
571        {
572            APPL_TRACE_ERROR("exceed max poll range, ps_i:%d, MAX_POLL:%d, count:%d, ts[h].poll_count:%d",
573                    ps_i, MAX_POLL, count, ts[h].poll_count);
574            return;
575        }
576        if(ts[h].ps[ps_i].pfd.fd >= 0)
577        {
578            pfds[pfd_i] =  ts[h].ps[ps_i].pfd;
579            ts[h].psi[pfd_i] = ps_i;
580            count++;
581            pfd_i++;
582        }
583        ps_i++;
584    }
585}
586static void *sock_poll_thread(void *arg)
587{
588    struct pollfd pfds[MAX_POLL];
589    memset(pfds, 0, sizeof(pfds));
590    int h = (intptr_t)arg;
591    for(;;)
592    {
593        prepare_poll_fds(h, pfds);
594        int ret = poll(pfds, ts[h].poll_count, -1);
595        if(ret == -1)
596        {
597            APPL_TRACE_ERROR("poll ret -1, exit the thread, errno:%d, err:%s", errno, strerror(errno));
598            break;
599        }
600        if(ret != 0)
601        {
602            int need_process_data_fd = TRUE;
603            if(pfds[0].revents) //cmd fd always is the first one
604            {
605                asrt(pfds[0].fd == ts[h].cmd_fdr);
606                if(!process_cmd_sock(h))
607                {
608                    APPL_TRACE_DEBUG("h:%d, process_cmd_sock return false, exit...", h);
609                    break;
610                }
611                if(ret == 1)
612                    need_process_data_fd = FALSE;
613                else ret--; //exclude the cmd fd
614            }
615            if(need_process_data_fd)
616                process_data_sock(h, pfds, ret);
617        }
618        else {APPL_TRACE_DEBUG("no data, select ret: %d", ret)};
619    }
620    ts[h].thread_id = -1;
621    APPL_TRACE_DEBUG("socket poll thread exiting, h:%d", h);
622    return 0;
623}
624