1 #include <stdio.h>

2 #include <assert.h>

3 #include <unistd.h>

4 #include <pthread.h>

5 #include <android/log.h>

6 #include "logger.h"

7

8 #ifndef APP_NAME

9 #define APP_NAME "stereotunnel"

10 #endif

11

12 static void *thread_func(void *arg);

13

14 static int pfd[2];

15 static pthread_t thr;

16 static int initialized;

17

18 int start_logger(void)

19 {

20 if(initialized) {

21 return 1;

22 }

23

24 /* set stdout to line-buffered, and stderr to unbuffered */

25 setvbuf(stdout, 0, _IOLBF, 0);

26 setvbuf(stderr, 0, _IONBF, 0);

27

28 if(pipe(pfd) == -1) {

29 perror("failed to create logging pipe");

30 return -1;

31 }

32 assert(pfd[0] > 2 && pfd[1] > 2);

33

34 /* redirect stdout & stderr to the write-end of the pipe */

35 dup2(pfd[1], 1);

36 dup2(pfd[1], 2);

37

38 /* start the logging thread */

39 if(pthread_create(&thr, 0, thread_func, 0) == -1) {

40 perror("failed to spawn logging thread");

41 return -1;

42 }

43 pthread_detach(thr);

44 return 0;

45 }

46

47 static void *thread_func(void *arg)

48 {

49 ssize_t rdsz;

50 char buf[257];

51

52 __android_log_print(ANDROID_LOG_DEBUG, APP_NAME, "logger starting up...");

53

54 while((rdsz = read(pfd[0], buf, sizeof buf - 1)) > 0) {

55 if(buf[rdsz - 1] == '\n') {

56 --rdsz;

57 }

58 buf[rdsz] = 0;

59 __android_log_write(ANDROID_LOG_DEBUG, APP_NAME, buf);

60 }

61

62 __android_log_print(ANDROID_LOG_DEBUG, APP_NAME, "logger shutting down...");

63 return 0;

64 }