San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 1 | #include <stdlib.h> |
| 2 | #include <sys/socket.h> |
| 3 | #include <sys/select.h> |
| 4 | #include <sys/time.h> |
| 5 | #include <sys/types.h> |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 6 | #include <errno.h> |
| 7 | #include <pthread.h> |
| 8 | |
| 9 | #define LOG_TAG "WifiScanner" |
| 10 | #include <cutils/log.h> |
| 11 | |
| 12 | #include "WifiScanner.h" |
| 13 | #include "Supplicant.h" |
| 14 | |
| 15 | extern "C" int pthread_cancel(pthread_t thread); |
| 16 | |
| 17 | WifiScanner::WifiScanner(Supplicant *suppl, int period) { |
| 18 | mSuppl = suppl; |
| 19 | mPeriod = period; |
| 20 | mActive = false; |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 21 | } |
| 22 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 23 | int WifiScanner::start(bool active) { |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 24 | mActive = active; |
| 25 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 26 | if(pipe(mCtrlPipe)) |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 27 | return -1; |
| 28 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 29 | if (pthread_create(&mThread, NULL, WifiScanner::threadStart, this)) |
| 30 | return -1; |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | void *WifiScanner::threadStart(void *obj) { |
| 35 | WifiScanner *me = reinterpret_cast<WifiScanner *>(obj); |
| 36 | me->run(); |
| 37 | pthread_exit(NULL); |
| 38 | return NULL; |
| 39 | } |
| 40 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 41 | int WifiScanner::stop() { |
| 42 | char c = 0; |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 43 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 44 | if (write(mCtrlPipe[1], &c, 1) != 1) { |
| 45 | LOGE("Error writing to control pipe (%s)", strerror(errno)); |
| 46 | return -1; |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 47 | } |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 48 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 49 | void *ret; |
| 50 | if (pthread_join(mThread, &ret)) { |
| 51 | LOGE("Error joining to scanner thread (%s)", strerror(errno)); |
| 52 | return -1; |
| 53 | } |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 54 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 55 | close(mCtrlPipe[0]); |
| 56 | close(mCtrlPipe[1]); |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | void WifiScanner::run() { |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 61 | LOGD("Starting wifi scanner (active = %d)", mActive); |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 62 | |
| 63 | while(1) { |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 64 | fd_set read_fds; |
| 65 | struct timeval to; |
| 66 | int rc = 0; |
| 67 | |
San Mehat | 4876567 | 2009-05-20 15:28:43 -0700 | [diff] [blame^] | 68 | to.tv_usec = 0; |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 69 | to.tv_sec = mPeriod; |
| 70 | |
| 71 | FD_ZERO(&read_fds); |
| 72 | FD_SET(mCtrlPipe[0], &read_fds); |
| 73 | |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 74 | if (mSuppl->triggerScan(mActive)) { |
| 75 | LOGW("Error triggering scan (%s)", strerror(errno)); |
| 76 | } |
| 77 | |
San Mehat | e67651c | 2009-05-12 15:50:49 -0700 | [diff] [blame] | 78 | if ((rc = select(mCtrlPipe[0] + 1, &read_fds, NULL, NULL, &to)) < 0) { |
| 79 | LOGE("select failed (%s) - sleeping for one scanner period", strerror(errno)); |
| 80 | sleep(mPeriod); |
| 81 | continue; |
| 82 | } else if (!rc) { |
| 83 | } else if (FD_ISSET(mCtrlPipe[0], &read_fds)) |
| 84 | break; |
| 85 | } // while |
San Mehat | 4876567 | 2009-05-20 15:28:43 -0700 | [diff] [blame^] | 86 | LOGD("Stopping wifi scanner"); |
San Mehat | 1441e76 | 2009-05-07 11:37:10 -0700 | [diff] [blame] | 87 | } |