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 static void *thread_func(void *arg);

9

10 static int pfd[2];

11 static pthread_t thr;

12 static int initialized;

13

14 int start_logger(void)

15 {

16 if(initialized) {

17 return 1;

18 }

19

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

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

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

23

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

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

26 return -1;

27 }

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

29

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

31 dup2(pfd[1], 1);

32 dup2(pfd[1], 2);

33

34 /* start the logging thread */

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

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

37 return -1;

38 }

39 pthread_detach(thr);

40 return 0;

41 }

42

43 static void *thread_func(void *arg)

44 {

45 ssize_t rdsz;

46 char buf[257];

47

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

49

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

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

52 --rdsz;

53 }

54 buf[rdsz] = 0;

55 __android_log_write(ANDROID_LOG_DEBUG, APP_NAME, buf);

56 }

57

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

59 return 0;

60 }