mm_session.c

   1 /*
   2  * libmm-session
   3  *
   4  * Copyright (c) 2000 - 2013 Samsung Electronics Co., Ltd. All rights reserved.
   5  *
   6  * Contact: Seungbae Shin <seungbae.shin at samsung.com>, Sangchul Lee <sc11.lee at samsung.com>
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  * http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  *
  20  */
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <mm_session_private.h>
  28 #include <mm_error.h>
  29 #include <mm_debug.h>
  30 #include <errno.h>
  31 #include <pthread.h>
  32 #include <signal.h>
  33
  34 #define EXPORT_API __attribute__((__visibility__("default")))
  35 #define MAX_FILE_LENGTH 256
  36
  37 int g_session_type = -1;
  38
  39 struct sigaction session_int_old_action;
  40 struct sigaction session_abrt_old_action;
  41 struct sigaction session_segv_old_action;
  42 struct sigaction session_term_old_action;
  43 struct sigaction session_sys_old_action;
  44 struct sigaction session_xcpu_old_action;
  45
  46 EXPORT_API
  47 int mm_session_init(int sessiontype)
  48 {
  49         int result = MM_ERROR_NONE;
  50         int ltype = 0;
  51         bool do_not_update_session_info = false;
  52
  53         debug_fenter();
  54         debug_log("type : %d", sessiontype);
  55
  56         if (sessiontype < MM_SESSION_TYPE_MEDIA || sessiontype >= MM_SESSION_TYPE_NUM) {
  57                 debug_error("Invalid argument %d",sessiontype);
  58                 return MM_ERROR_INVALID_ARGUMENT;
  59         }
  60
  61         result = _mm_session_util_read_type(-1, &ltype);
  62         if (MM_ERROR_INVALID_HANDLE != result) {
  63                 if ((ltype == MM_SESSION_TYPE_MEDIA_RECORD) && sessiontype == MM_SESSION_TYPE_MEDIA) {
  64                         /* already set by mm-camcorder, mm-sound(pcm in), keep going */
  65                         do_not_update_session_info = true;
  66                 } else {
  67                         debug_error("Session already initialized. Please finish current session first");
  68                         return MM_ERROR_POLICY_DUPLICATED;
  69                 }
  70         }
  71
  72         g_session_type = sessiontype;
  73
  74         if (!do_not_update_session_info) {
  75                 result = _mm_session_util_write_type(-1, sessiontype);
  76                 if (MM_ERROR_NONE != result) {
  77                         debug_error("Write type failed");
  78                         g_session_type = -1;
  79                         return result;
  80                 }
  81         }
  82
  83         debug_fleave();
  84
  85         return MM_ERROR_NONE;
  86 }
  87
  88 EXPORT_API
  89 int mm_session_update_option(session_update_type_t update_type, int options)
  90 {
  91         int result = MM_ERROR_NONE;
  92         int ltype = 0;
  93         int loption = 0;
  94
  95         debug_log("update_type: %d(0:Add, 1:Remove), options: %x", update_type, options);
  96
  97         if (update_type < 0 || update_type >= MM_SESSION_UPDATE_TYPE_NUM) {
  98                 debug_error("Invalid update_type value(%d)", update_type);
  99                 return MM_ERROR_INVALID_ARGUMENT;
 100         }
 101         if (options < 0) {
 102                 debug_error("Invalid options value(%x)", options);
 103                 return MM_ERROR_INVALID_ARGUMENT;
 104         }
 105
 106         result = _mm_session_util_read_information(-1, &ltype, &loption);
 107         if (result) {
 108                 debug_error("failed to _mm_session_util_read_information(), ret(%x)", result);
 109                 return result;
 110         }
 111         debug_log("[current] session_type: %d, session_option: %x", ltype, loption);
 112
 113         if (update_type == MM_SESSION_UPDATE_TYPE_ADD) {
 114                 loption |= options;
 115         } else if (update_type == MM_SESSION_UPDATE_TYPE_REMOVE) {
 116                 loption &= ~options;
 117         }
 118
 119         result = _mm_session_util_write_information(-1, ltype, loption);
 120         if (result) {
 121                 debug_error("failed to _mm_session_util_write_information(), ret(%x)", result);
 122                 return result;
 123         }
 124
 125         debug_log("[updated] session_type: %d, session_option: %x", ltype, loption);
 126
 127
 128         return MM_ERROR_NONE;
 129 }
 130
 131 EXPORT_API
 132 int mm_session_get_current_type(int *sessiontype)
 133 {
 134         int result = MM_ERROR_NONE;
 135         int ltype = 0;
 136
 137         debug_fenter();
 138
 139         if (sessiontype == NULL) {
 140                 debug_error("input argument is NULL\n");
 141                 return MM_ERROR_INVALID_ARGUMENT;
 142         }
 143
 144         result = _mm_session_util_read_type(-1, &ltype);
 145         if (result == MM_ERROR_NONE) {
 146                 debug_log("Current process session type = [%d]\n", ltype);
 147                 *sessiontype = ltype;
 148         } else {
 149                 debug_error("failed to get current process session type!!\n");
 150         }
 151
 152         debug_fleave();
 153
 154         return result;
 155 }
 156
 157 EXPORT_API
 158 int mm_session_get_current_information(int *session_type, int *session_options)
 159 {
 160         int result = MM_ERROR_NONE;
 161         int ltype = 0;
 162         int loption = 0;
 163
 164         debug_fenter();
 165
 166         if (session_type == NULL) {
 167                 debug_error("input argument is NULL\n");
 168                 return MM_ERROR_INVALID_ARGUMENT;
 169         }
 170
 171         result = _mm_session_util_read_information(-1, &ltype, &loption);
 172         if (result == MM_ERROR_NONE) {
 173                 debug_log("Current process session type = [%d], options = [%x]\n", ltype, loption);
 174                 *session_type = ltype;
 175                 *session_options = loption;
 176         } else {
 177                 debug_error("failed to get current process session type, option!!\n");
 178         }
 179
 180         debug_fleave();
 181
 182         return result;
 183 }
 184
 185 EXPORT_API
 186 int mm_session_finish(void)
 187 {
 188         int result = MM_ERROR_NONE;
 189         int sessiontype = MM_SESSION_TYPE_MEDIA;
 190
 191         debug_fenter();
 192
 193         result = _mm_session_util_read_type(-1, &sessiontype);
 194         if (MM_ERROR_NONE != result) {
 195                 debug_error("Can not read current type");
 196                 return result;
 197         }
 198
 199         /* Check monitor handle */
 200         result = _mm_session_util_delete_information(-1);
 201         if(result != MM_ERROR_NONE)
 202                 return result;
 203
 204         debug_fleave();
 205
 206         return MM_ERROR_NONE;
 207 }
 208
 209 EXPORT_API
 210 int _mm_session_util_delete_information(int app_pid)
 211 {
 212         pid_t mypid;
 213         char filename[MAX_FILE_LENGTH];
 214
 215         if(app_pid == -1)
 216                 mypid = getpid();
 217         else
 218                 mypid = (pid_t)app_pid;
 219
 220         ////// DELETE SESSION TYPE /////////
 221         snprintf(filename, sizeof(filename)-1, "/tmp/mm_session_%d", mypid);
 222         if(-1 ==  unlink(filename))
 223                 return MM_ERROR_FILE_NOT_FOUND;
 224         ////// DELETE SESSION TYPE /////////
 225
 226         return MM_ERROR_NONE;
 227 }
 228
 229 EXPORT_API
 230 int _mm_session_util_write_type(int app_pid, int sessiontype)
 231 {
 232         pid_t mypid;
 233         int fd = -1;
 234         char filename[MAX_FILE_LENGTH];
 235
 236         if(sessiontype < MM_SESSION_TYPE_MEDIA || sessiontype >= MM_SESSION_TYPE_NUM) {
 237                 return MM_ERROR_INVALID_ARGUMENT;
 238         }
 239
 240         if(app_pid == -1)
 241                 mypid = getpid();
 242         else
 243                 mypid = (pid_t)app_pid;
 244
 245         ////// WRITE SESSION TYPE /////////
 246         snprintf(filename, sizeof(filename)-1, "/tmp/mm_session_%d", mypid);
 247         fd = open(filename, O_WRONLY | O_CREAT, 0644 );
 248         if(fd < 0) {
 249                 debug_error("open() failed with %d",errno);
 250                 return MM_ERROR_FILE_WRITE;
 251         }
 252         sessiontype = sessiontype << 16;
 253         write(fd, &sessiontype, sizeof(int));
 254         if(0 > fchmod (fd, 00777)) {
 255                 debug_error("fchmod failed with %d", errno);
 256         } else {
 257                 debug_warning("write sessiontype(%d) to /tmp/mm_session_%d", sessiontype >> 16, mypid);
 258         }
 259         close(fd);
 260         ////// WRITE SESSION TYPE /////////
 261
 262         return MM_ERROR_NONE;
 263 }
 264
 265 EXPORT_API
 266 int _mm_session_util_read_type(int app_pid, int *sessiontype)
 267 {
 268         pid_t mypid;
 269         int fd = -1;
 270         char filename[MAX_FILE_LENGTH];
 271
 272         debug_fenter();
 273
 274         if(sessiontype == NULL)
 275                 return MM_ERROR_INVALID_ARGUMENT;
 276
 277         if(app_pid == -1)
 278                 mypid = getpid();
 279         else
 280                 mypid = (pid_t)app_pid;
 281
 282         ////// READ SESSION TYPE /////////
 283         snprintf(filename, sizeof(filename)-1, "/tmp/mm_session_%d", mypid);
 284         fd = open(filename, O_RDONLY);
 285         if(fd < 0) {
 286                 return MM_ERROR_INVALID_HANDLE;
 287         }
 288         read(fd, sessiontype, sizeof(int));
 289         *sessiontype = *sessiontype >> 16;
 290         debug_warning("read sessiontype(%d) from /tmp/mm_session_%d", *sessiontype, mypid);
 291         close(fd);
 292         ////// READ SESSION TYPE /////////
 293
 294         debug_fleave();
 295
 296         return MM_ERROR_NONE;
 297 }
 298
 299 EXPORT_API
 300 int _mm_session_util_write_information(int app_pid, int session_type, int flags)
 301 {
 302         pid_t mypid;
 303         int fd = -1;
 304         char filename[MAX_FILE_LENGTH];
 305         int result_info = 0;
 306
 307         if ((session_type != MM_SESSION_TYPE_REPLACED_BY_STREAM) &&
 308             (session_type < MM_SESSION_TYPE_MEDIA || session_type >= MM_SESSION_TYPE_NUM)) {
 309                 return MM_ERROR_INVALID_ARGUMENT;
 310         }
 311         if(flags < 0) {
 312                 return MM_ERROR_INVALID_ARGUMENT;
 313         }
 314
 315         if(app_pid == -1) {
 316                 mypid = getpid();
 317         } else {
 318                 mypid = (pid_t)app_pid;
 319         }
 320
 321         ////// WRITE SESSION INFO /////////
 322         snprintf(filename, sizeof(filename)-1, "/tmp/mm_session_%d", mypid);
 323         fd = open(filename, O_WRONLY | O_CREAT, 0644 );
 324         if(fd < 0) {
 325                 debug_error("open() failed with %d",errno);
 326                 return MM_ERROR_FILE_WRITE;
 327         }
 328
 329         result_info = (flags) | (session_type << 16);
 330         write(fd, &result_info, sizeof(int));
 331         if (0 > fchmod (fd, 00777)) {
 332                 debug_error("fchmod failed with %d", errno);
 333         } else {
 334                 debug_warning("write session information(%x) to /tmp/mm_session_%d", result_info, mypid);
 335         }
 336         close(fd);
 337         ////// WRITE SESSION INFO /////////
 338
 339         return MM_ERROR_NONE;
 340 }
 341
 342 EXPORT_API
 343 int _mm_session_util_read_information(int app_pid, int *session_type, int *flags)
 344 {
 345         pid_t mypid;
 346         int fd = -1;
 347         char filename[MAX_FILE_LENGTH];
 348         int result_info = 0;
 349
 350         debug_fenter();
 351
 352         if(session_type == NULL || flags == NULL) {
 353                 return MM_ERROR_INVALID_ARGUMENT;
 354         }
 355
 356         if(app_pid == -1) {
 357                 mypid = getpid();
 358         } else {
 359                 mypid = (pid_t)app_pid;
 360         }
 361
 362         ////// READ SESSION INFO /////////
 363         snprintf(filename, sizeof(filename)-1, "/tmp/mm_session_%d", mypid);
 364         fd = open(filename, O_RDONLY);
 365         if(fd < 0) {
 366                 return MM_ERROR_INVALID_HANDLE;
 367         }
 368         read(fd, &result_info, sizeof(int));
 369         *session_type = result_info >> 16;
 370         *flags = result_info & 0x0000ffff;
 371
 372         debug_warning("read session_type(%d), session_option(%x) from /tmp/mm_session_%d", *session_type, *flags, mypid);
 373         close(fd);
 374         ////// READ SESSION INFO /////////
 375
 376         debug_fleave();
 377
 378         return MM_ERROR_NONE;
 379 }
 380
 381 void __session_signal_handler(int signo, siginfo_t *siginfo, void *context)
 382 {
 383         char filename[MAX_FILE_LENGTH];
 384         char str_error[256];
 385
 386         debug_warning("ENTER, sig.num(%d)", signo);
 387
 388         /* signal block -------------- */
 389         sigset_t old_mask, all_mask;
 390         sigfillset(&all_mask);
 391         sigprocmask(SIG_BLOCK, &all_mask, &old_mask);
 392
 393         snprintf(filename, sizeof(filename) - 1, "/tmp/mm_session_%d", getpid());
 394         if (!remove(filename)) {
 395                 debug_log(" remove %s success\n", filename);
 396         } else {
 397                 strerror_r(errno, str_error, sizeof(str_error));
 398                 debug_error(" remove %s failed with %s\n", filename, str_error);
 399         }
 400
 401         sigprocmask(SIG_SETMASK, &old_mask, NULL);
 402         /* signal unblock ------------ */
 403
 404         switch (signo) {
 405         case SIGINT:
 406                 if (session_int_old_action.sa_sigaction)
 407                         session_int_old_action.sa_sigaction(signo, siginfo, context);
 408                 else
 409                         sigaction(signo, &session_int_old_action, NULL);
 410                 break;
 411         case SIGABRT:
 412                 if (session_abrt_old_action.sa_sigaction)
 413                         session_abrt_old_action.sa_sigaction(signo, siginfo, context);
 414                 else
 415                         sigaction(signo, &session_abrt_old_action, NULL);
 416                 break;
 417         case SIGSEGV:
 418                 if (session_segv_old_action.sa_sigaction)
 419                         session_segv_old_action.sa_sigaction(signo, siginfo, context);
 420                 else
 421                         sigaction(signo, &session_segv_old_action, NULL);
 422                 break;
 423         case SIGTERM:
 424                 if (session_term_old_action.sa_sigaction)
 425                         session_term_old_action.sa_sigaction(signo, siginfo, context);
 426                 else
 427                         sigaction(signo, &session_term_old_action, NULL);
 428                 break;
 429         case SIGSYS:
 430                 if (session_sys_old_action.sa_sigaction)
 431                         session_sys_old_action.sa_sigaction(signo, siginfo, context);
 432                 else
 433                         sigaction(signo, &session_sys_old_action, NULL);
 434                 break;
 435         case SIGXCPU:
 436                 if (session_xcpu_old_action.sa_sigaction)
 437                         session_xcpu_old_action.sa_sigaction(signo, siginfo, context);
 438                 else
 439                         sigaction(signo, &session_xcpu_old_action, NULL);
 440                 break;
 441         default:
 442                 break;
 443         }
 444
 445         debug_warning("LEAVE");
 446 }
 447
 448 __attribute__ ((constructor))
 449 void __mmsession_initialize(void)
 450 {
 451         struct sigaction session_action;
 452         session_action.sa_sigaction = __session_signal_handler;
 453         session_action.sa_flags = SA_NOCLDSTOP | SA_SIGINFO;
 454
 455         debug_fenter();
 456
 457         sigemptyset(&session_action.sa_mask);
 458
 459         sigaction(SIGINT, &session_action, &session_int_old_action);
 460         sigaction(SIGABRT, &session_action, &session_abrt_old_action);
 461         sigaction(SIGSEGV, &session_action, &session_segv_old_action);
 462         sigaction(SIGTERM, &session_action, &session_term_old_action);
 463         sigaction(SIGSYS, &session_action, &session_sys_old_action);
 464         sigaction(SIGXCPU, &session_action, &session_xcpu_old_action);
 465
 466         debug_fleave();
 467 }
 468
 469 __attribute__ ((destructor))
 470 void __mmsession_finalize(void)
 471 {
 472
 473         debug_fenter();
 474
 475         _mm_session_util_delete_information(-1);
 476
 477         sigaction(SIGINT, &session_int_old_action, NULL);
 478         sigaction(SIGABRT, &session_abrt_old_action, NULL);
 479         sigaction(SIGSEGV, &session_segv_old_action, NULL);
 480         sigaction(SIGTERM, &session_term_old_action, NULL);
 481         sigaction(SIGSYS, &session_sys_old_action, NULL);
 482         sigaction(SIGXCPU, &session_xcpu_old_action, NULL);
 483
 484         debug_fleave();
 485 }
 486