btif_sock_thread.c revision 794f3b5f126fffc3dd1129a710187591348bbf23 
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 <string.h>
36#include <sys/types.h>
37#include <sys/socket.h>
38#include <sys/un.h>
39#include <time.h>
40#include <fcntl.h>
41#include <unistd.h>
42#include <signal.h>
43#include <pthread.h>
44#include <ctype.h>
45
46#include <sys/select.h>
47#include <sys/poll.h>
48#include <cutils/sockets.h>
49#include <alloca.h>
50
51#define LOG_TAG "BTIF_SOCK"
52#include "btif_common.h"
53#include "btif_util.h"
54
55
56#include "bta_api.h"
57#include "btif_sock.h"
58#include "btif_sock_thread.h"
59#include "btif_sock_util.h"
60
61#include <cutils/log.h>
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 pid_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
112static pthread_mutex_t thread_slot_lock;
113
114
115static inline void set_socket_blocking(int s, int blocking)
116{
117    int opts;
118    opts = fcntl(s, F_GETFL);
119    if (opts<0) APPL_TRACE_ERROR("set blocking (%s)", strerror(errno));
120    if(blocking)
121        opts &= ~O_NONBLOCK;
122    else opts |= O_NONBLOCK;
123    fcntl(s, F_SETFL, opts);
124}
125
126static inline int create_server_socket(const char* name)
127{
128    int s = socket(AF_LOCAL, SOCK_STREAM, 0);
129    APPL_TRACE_DEBUG("covert name to android abstract name:%s", name);
130    if(socket_local_server_bind(s, name, ANDROID_SOCKET_NAMESPACE_ABSTRACT) >= 0)
131    {
132        if(listen(s, 5) == 0)
133        {
134            APPL_TRACE_DEBUG("listen to local socket:%s, fd:%d", name, s);
135            return s;
136        }
137        else APPL_TRACE_ERROR("listen to local socket:%s, fd:%d failed, errno:%d", name, s, errno);
138    }
139    else APPL_TRACE_ERROR("create local socket:%s fd:%d, failed, errno:%d", name, s, errno);
140    close(s);
141    return -1;
142}
143static inline int connect_server_socket(const char* name)
144{
145    int s = socket(AF_LOCAL, SOCK_STREAM, 0);
146    set_socket_blocking(s, TRUE);
147    if(socket_local_client_connect(s, name, ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM) >= 0)
148    {
149        APPL_TRACE_DEBUG("connected to local socket:%s, fd:%d", name, s);
150        return s;
151    }
152    else APPL_TRACE_ERROR("connect to local socket:%s, fd:%d failed, errno:%d", name, s, errno);
153    close(s);
154    return -1;
155}
156static inline int accept_server_socket(int s)
157{
158    struct sockaddr_un client_address;
159    socklen_t clen;
160    int fd = accept(s, (struct sockaddr*)&client_address, &clen);
161    APPL_TRACE_DEBUG("accepted fd:%d for server fd:%d", fd, s);
162    return fd;
163}
164static inline pthread_t create_thread(void *(*start_routine)(void *), void * arg)
165{
166    pthread_attr_t thread_attr;
167    pthread_attr_init(&thread_attr);
168    pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE);
169    pthread_t thread_id = -1;
170    if( pthread_create(&thread_id, &thread_attr, start_routine, arg)!=0 )
171    {
172        APPL_TRACE_ERROR("pthread_create : %s", strerror(errno));
173        return -1;
174    }
175    return thread_id;
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        init_slot_lock(&thread_slot_lock);
211        int h;
212        for(h = 0; h < MAX_THREAD; h++)
213        {
214            ts[h].cmd_fdr = ts[h].cmd_fdw = -1;
215            ts[h].used = 0;
216            ts[h].thread_id = -1;
217            ts[h].poll_count = 0;
218            ts[h].callback = NULL;
219            ts[h].cmd_callback = NULL;
220        }
221    }
222    return TRUE;
223}
224int btsock_thread_create(btsock_signaled_cb callback, btsock_cmd_cb cmd_callback)
225{
226    int ret = FALSE;
227    asrt(callback || cmd_callback);
228    lock_slot(&thread_slot_lock);
229    int h = alloc_thread_slot();
230    unlock_slot(&thread_slot_lock);
231    APPL_TRACE_DEBUG("alloc_thread_slot ret:%d", h);
232    if(h >= 0)
233    {
234        init_poll(h);
235        if((ts[h].thread_id = create_thread(sock_poll_thread, (void*)(uintptr_t)h)) != -1)
236        {
237            APPL_TRACE_DEBUG("h:%d, thread id:%d", h, ts[h].thread_id);
238            ts[h].callback = callback;
239            ts[h].cmd_callback = cmd_callback;
240        }
241        else
242        {
243            free_thread_slot(h);
244            h = -1;
245        }
246    }
247    return h;
248}
249
250/* create dummy socket pair used to wake up select loop */
251static inline void init_cmd_fd(int h)
252{
253    asrt(ts[h].cmd_fdr == -1 && ts[h].cmd_fdw == -1);
254    if(socketpair(AF_UNIX, SOCK_STREAM, 0, &ts[h].cmd_fdr) < 0)
255    {
256        APPL_TRACE_ERROR("socketpair failed: %s", strerror(errno));
257        return;
258    }
259    APPL_TRACE_DEBUG("h:%d, cmd_fdr:%d, cmd_fdw:%d", h, ts[h].cmd_fdr, ts[h].cmd_fdw);
260    //add the cmd fd for read & write
261    add_poll(h, ts[h].cmd_fdr, 0, SOCK_THREAD_FD_RD, 0);
262}
263static inline void close_cmd_fd(int h)
264{
265    if(ts[h].cmd_fdr != -1)
266    {
267        close(ts[h].cmd_fdr);
268        ts[h].cmd_fdr = -1;
269    }
270    if(ts[h].cmd_fdw != -1)
271    {
272        close(ts[h].cmd_fdw);
273        ts[h].cmd_fdw = -1;
274    }
275}
276typedef struct
277{
278    int id;
279    int fd;
280    int type;
281    int flags;
282    uint32_t user_id;
283} sock_cmd_t;
284int btsock_thread_add_fd(int h, int fd, int type, int flags, uint32_t user_id)
285{
286    if(h < 0 || h >= MAX_THREAD)
287    {
288        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
289        return FALSE;
290    }
291    if(ts[h].cmd_fdw == -1)
292    {
293        APPL_TRACE_ERROR("cmd socket is not created. socket thread may not initialized");
294        return FALSE;
295    }
296    if(flags & SOCK_THREAD_ADD_FD_SYNC)
297    {
298        //must executed in socket poll thread
299        if(ts[h].thread_id == pthread_self())
300        {
301            //cleanup one-time flags
302            flags &= ~SOCK_THREAD_ADD_FD_SYNC;
303            add_poll(h, fd, type, flags, user_id);
304            return TRUE;
305        }
306        APPL_TRACE_DEBUG("THREAD_ADD_FD_SYNC is not called in poll thread, fallback to async");
307    }
308    sock_cmd_t cmd = {CMD_ADD_FD, fd, type, flags, user_id};
309    APPL_TRACE_DEBUG("adding fd:%d, flags:0x%x", fd, flags);
310    return send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
311}
312
313bool btsock_thread_remove_fd_and_close(int thread_handle, int fd)
314{
315    if (thread_handle < 0 || thread_handle >= MAX_THREAD)
316    {
317        APPL_TRACE_ERROR("%s invalid thread handle: %d", __func__, thread_handle);
318        return false;
319    }
320    if (fd == -1)
321    {
322        APPL_TRACE_ERROR("%s invalid file descriptor.", __func__);
323        return false;
324    }
325
326    sock_cmd_t cmd = {CMD_REMOVE_FD, fd, 0, 0, 0};
327    return send(ts[thread_handle].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
328}
329
330int btsock_thread_post_cmd(int h, int type, const unsigned char* data, int size, uint32_t user_id)
331{
332    if(h < 0 || h >= MAX_THREAD)
333    {
334        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
335        return FALSE;
336    }
337    if(ts[h].cmd_fdw == -1)
338    {
339        APPL_TRACE_ERROR("cmd socket is not created. socket thread may not initialized");
340        return FALSE;
341    }
342    sock_cmd_t cmd = {CMD_USER_PRIVATE, 0, type, size, user_id};
343    APPL_TRACE_DEBUG("post cmd type:%d, size:%d, h:%d, ", type, size, h);
344    sock_cmd_t* cmd_send = &cmd;
345    int size_send = sizeof(cmd);
346    if(data && size)
347    {
348        size_send = sizeof(cmd) + size;
349        cmd_send = (sock_cmd_t*)alloca(size_send);
350        if(cmd_send)
351        {
352            *cmd_send = cmd;
353            memcpy(cmd_send + 1, data, size);
354        }
355        else
356        {
357            APPL_TRACE_ERROR("alloca failed at h:%d, cmd type:%d, size:%d", h, type, size_send);
358            return FALSE;
359        }
360    }
361    return send(ts[h].cmd_fdw, cmd_send, size_send, 0) == size_send;
362}
363int btsock_thread_wakeup(int h)
364{
365    if(h < 0 || h >= MAX_THREAD)
366    {
367        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
368        return FALSE;
369    }
370    if(ts[h].cmd_fdw == -1)
371    {
372        APPL_TRACE_ERROR("thread handle:%d, cmd socket is not created", h);
373        return FALSE;
374    }
375    sock_cmd_t cmd = {CMD_WAKEUP, 0, 0, 0, 0};
376    return send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd);
377}
378int btsock_thread_exit(int h)
379{
380    if(h < 0 || h >= MAX_THREAD)
381    {
382        APPL_TRACE_ERROR("invalid bt thread handle:%d", h);
383        return FALSE;
384    }
385    if(ts[h].cmd_fdw == -1)
386    {
387        APPL_TRACE_ERROR("cmd socket is not created");
388        return FALSE;
389    }
390    sock_cmd_t cmd = {CMD_EXIT, 0, 0, 0, 0};
391    if(send(ts[h].cmd_fdw, &cmd, sizeof(cmd), 0) == sizeof(cmd))
392    {
393        pthread_join(ts[h].thread_id, 0);
394        lock_slot(&thread_slot_lock);
395        free_thread_slot(h);
396        unlock_slot(&thread_slot_lock);
397        return TRUE;
398    }
399    return FALSE;
400}
401static void init_poll(int h)
402{
403    int i;
404    ts[h].poll_count = 0;
405    ts[h].thread_id = -1;
406    ts[h].callback = NULL;
407    ts[h].cmd_callback = NULL;
408    for(i = 0; i < MAX_POLL; i++)
409    {
410        ts[h].ps[i].pfd.fd = -1;
411        ts[h].psi[i] = -1;
412    }
413    init_cmd_fd(h);
414}
415static inline unsigned int flags2pevents(int flags)
416{
417    unsigned int pevents = 0;
418    if(flags & SOCK_THREAD_FD_WR)
419        pevents |= POLLOUT;
420    if(flags & SOCK_THREAD_FD_RD)
421        pevents |= POLLIN;
422    pevents |= POLL_EXCEPTION_EVENTS;
423    return pevents;
424}
425
426static inline void set_poll(poll_slot_t* ps, int fd, int type, int flags, uint32_t user_id)
427{
428    ps->pfd.fd = fd;
429    ps->user_id = user_id;
430    if(ps->type != 0 && ps->type != type)
431        APPL_TRACE_ERROR("poll socket type should not changed! type was:%d, type now:%d", ps->type, type);
432    ps->type = type;
433    ps->flags = flags;
434    ps->pfd.events = flags2pevents(flags);
435    ps->pfd.revents = 0;
436}
437static inline void add_poll(int h, int fd, int type, int flags, uint32_t user_id)
438{
439    asrt(fd != -1);
440    int i;
441    int empty = -1;
442    poll_slot_t* ps = ts[h].ps;
443
444    for(i = 0; i < MAX_POLL; i++)
445    {
446        if(ps[i].pfd.fd == fd)
447        {
448            asrt(ts[h].poll_count < MAX_POLL);
449
450            set_poll(&ps[i], fd, type, flags | ps[i].flags, user_id);
451            return;
452        }
453        else if(empty < 0 && ps[i].pfd.fd == -1)
454            empty = i;
455    }
456    if(empty >= 0)
457    {
458        asrt(ts[h].poll_count < MAX_POLL);
459        set_poll(&ps[empty], fd, type, flags, user_id);
460        ++ts[h].poll_count;
461        return;
462    }
463    APPL_TRACE_ERROR("exceeded max poll slot:%d!", MAX_POLL);
464}
465static inline void remove_poll(int h, poll_slot_t* ps, int flags)
466{
467    if(flags == ps->flags)
468    {
469        //all monitored events signaled. To remove it, just clear the slot
470        --ts[h].poll_count;
471        memset(ps, 0, sizeof(*ps));
472        ps->pfd.fd = -1;
473    }
474    else
475    {
476        //one read or one write monitor event signaled, removed the accordding bit
477        ps->flags &= ~flags;
478        //update the poll events mask
479        ps->pfd.events = flags2pevents(ps->flags);
480    }
481}
482static int process_cmd_sock(int h)
483{
484    sock_cmd_t cmd = {-1, 0, 0, 0, 0};
485    int fd = ts[h].cmd_fdr;
486    if(recv(fd, &cmd, sizeof(cmd), MSG_WAITALL) != sizeof(cmd))
487    {
488        APPL_TRACE_ERROR("recv cmd errno:%d", errno);
489        return FALSE;
490    }
491    APPL_TRACE_DEBUG("cmd.id:%d", cmd.id);
492    switch(cmd.id)
493    {
494        case CMD_ADD_FD:
495            add_poll(h, cmd.fd, cmd.type, cmd.flags, cmd.user_id);
496            break;
497        case CMD_REMOVE_FD:
498            for (int i = 1; i < MAX_POLL; ++i)
499            {
500                poll_slot_t *poll_slot = &ts[h].ps[i];
501                if (poll_slot->pfd.fd == cmd.fd)
502                {
503                    remove_poll(h, poll_slot, poll_slot->flags);
504                    break;
505                }
506            }
507            close(cmd.fd);
508            break;
509        case CMD_WAKEUP:
510            break;
511        case CMD_USER_PRIVATE:
512            asrt(ts[h].cmd_callback);
513            if(ts[h].cmd_callback)
514                ts[h].cmd_callback(fd, cmd.type, cmd.flags, cmd.user_id);
515            break;
516        case CMD_EXIT:
517            return FALSE;
518        default:
519            APPL_TRACE_DEBUG("unknown cmd: %d", cmd.id);
520             break;
521    }
522    return TRUE;
523}
524static void process_data_sock(int h, struct pollfd *pfds, int count)
525{
526    asrt(count <= ts[h].poll_count);
527    int i;
528    for( i= 1; i < ts[h].poll_count; i++)
529    {
530        if(pfds[i].revents)
531        {
532            int ps_i = ts[h].psi[i];
533            asrt(pfds[i].fd == ts[h].ps[ps_i].pfd.fd);
534            uint32_t user_id = ts[h].ps[ps_i].user_id;
535            int type = ts[h].ps[ps_i].type;
536            int flags = 0;
537            print_events(pfds[i].revents);
538            if(IS_READ(pfds[i].revents))
539            {
540                flags |= SOCK_THREAD_FD_RD;
541            }
542            if(IS_WRITE(pfds[i].revents))
543            {
544                flags |= SOCK_THREAD_FD_WR;
545            }
546            if(IS_EXCEPTION(pfds[i].revents))
547            {
548                flags |= SOCK_THREAD_FD_EXCEPTION;
549                //remove the whole slot not flags
550                remove_poll(h, &ts[h].ps[ps_i], ts[h].ps[ps_i].flags);
551            }
552            else if(flags)
553                 remove_poll(h, &ts[h].ps[ps_i], flags); //remove the monitor flags that already processed
554            if(flags)
555                ts[h].callback(pfds[i].fd, type, flags, user_id);
556        }
557    }
558}
559
560static void prepare_poll_fds(int h, struct pollfd* pfds)
561{
562    int count = 0;
563    int ps_i = 0;
564    int pfd_i = 0;
565    asrt(ts[h].poll_count <= MAX_POLL);
566    memset(pfds, 0, sizeof(pfds[0])*ts[h].poll_count);
567    while(count < ts[h].poll_count)
568    {
569        if(ps_i >= MAX_POLL)
570        {
571            APPL_TRACE_ERROR("exceed max poll range, ps_i:%d, MAX_POLL:%d, count:%d, ts[h].poll_count:%d",
572                    ps_i, MAX_POLL, count, ts[h].poll_count);
573            return;
574        }
575        if(ts[h].ps[ps_i].pfd.fd >= 0)
576        {
577            pfds[pfd_i] =  ts[h].ps[ps_i].pfd;
578            ts[h].psi[pfd_i] = ps_i;
579            count++;
580            pfd_i++;
581        }
582        ps_i++;
583    }
584}
585static void *sock_poll_thread(void *arg)
586{
587    struct pollfd pfds[MAX_POLL];
588    memset(pfds, 0, sizeof(pfds));
589    int h = (intptr_t)arg;
590    for(;;)
591    {
592        prepare_poll_fds(h, pfds);
593        int ret = poll(pfds, ts[h].poll_count, -1);
594        if(ret == -1)
595        {
596            APPL_TRACE_ERROR("poll ret -1, exit the thread, errno:%d, err:%s", errno, strerror(errno));
597            break;
598        }
599        if(ret != 0)
600        {
601            int need_process_data_fd = TRUE;
602            if(pfds[0].revents) //cmd fd always is the first one
603            {
604                asrt(pfds[0].fd == ts[h].cmd_fdr);
605                if(!process_cmd_sock(h))
606                {
607                    APPL_TRACE_DEBUG("h:%d, process_cmd_sock return false, exit...", h);
608                    break;
609                }
610                if(ret == 1)
611                    need_process_data_fd = FALSE;
612                else ret--; //exclude the cmd fd
613            }
614            if(need_process_data_fd)
615                process_data_sock(h, pfds, ret);
616        }
617        else {APPL_TRACE_DEBUG("no data, select ret: %d", ret)};
618    }
619    ts[h].thread_id = -1;
620    APPL_TRACE_DEBUG("socket poll thread exiting, h:%d", h);
621    return 0;
622}
623
624