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 #include "app.h"

8

9 static void *thread_func(void *arg);

10

11 static int pfd[2];

12 static pthread_t thr;

13 static int initialized;

14

15 int start_logger(void)

16 {

17 if(initialized) {

18 return 1;

19 }

20

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

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

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

24

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

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

27 return -1;

28 }

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

30

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

32 dup2(pfd[1], 1);

33 dup2(pfd[1], 2);

34

35 /* start the logging thread */

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

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

38 return -1;

39 }

40 pthread_detach(thr);

41 return 0;

42 }

43

44 static void *thread_func(void *arg)

45 {

46 ssize_t rdsz;

47 char buf[257];

48

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

50

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

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

53 --rdsz;

54 }

55 buf[rdsz] = 0;

56 __android_log_write(ANDROID_LOG_DEBUG, APP_NAME, buf);

57 }

58

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

60 return 0;

61 }