From e0a7682607256ef24b5d2d58212c4b958cce0dce Mon Sep 17 00:00:00 2001 From: Andrew Gregory Date: Sat, 28 Jun 2014 13:41:39 -0400 Subject: use monotonic clock for progress updates gettimeofday is susceptible to backwards system time adjustments, skewing or altogether breaking progress output. For the sake of platforms that lack clock_gettime support, gettimeofday is retained as a fallback. Fixes FS#36983 Signed-off-by: Andrew Gregory Signed-off-by: Allan McRae --- src/pacman/callback.c | 58 +++++++++++++++++++++++++++------------------------ 1 file changed, 31 insertions(+), 27 deletions(-) (limited to 'src') diff --git a/src/pacman/callback.c b/src/pacman/callback.c index 6be20eca..1d68db4c 100644 --- a/src/pacman/callback.c +++ b/src/pacman/callback.c @@ -21,8 +21,9 @@ #include #include #include -#include +#include /* gettimeofday */ #include /* off_t */ +#include /* int64_t */ #include #include #include @@ -47,6 +48,24 @@ static alpm_list_t *output = NULL; /* update speed for the fill_progress based functions */ #define UPDATE_SPEED_MS 200 +#if !defined(CLOCK_MONOTONIC_COARSE) && defined(CLOCK_MONOTONIC) +#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC +#endif + +static int64_t get_time_ms(void) +{ +#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0) && defined(CLOCK_MONOTONIC_COARSE) + struct timespec ts = {0, 0}; + clock_gettime(CLOCK_MONOTONIC_COARSE, &ts); + return (ts.tv_sec * 1000) + (ts.tv_nsec / 1000000); +#else + /* darwin doesn't support clock_gettime, fallback to gettimeofday */ + struct timeval tv = {0, 0}; + gettimeofday(&tv, NULL); + return (tv.tv_sec * 1000) + (tv.tv_usec / 1000); +#endif +} + /** * Silly little helper function, determines if the caller needs a visual update * since the last time this function was called. @@ -54,27 +73,20 @@ static alpm_list_t *output = NULL; * @param first_call 1 on first call for initialization purposes, 0 otherwise * @return number of milliseconds since last call */ -static long get_update_timediff(int first_call) +static int64_t get_update_timediff(int first_call) { - long retval = 0; - static struct timeval last_time = {0, 0}; + int64_t retval = 0; + static int64_t last_time = 0; /* on first call, simply set the last time and return */ if(first_call) { - gettimeofday(&last_time, NULL); + last_time = get_time_ms(); } else { - struct timeval this_time; - time_t diff_sec; - suseconds_t diff_usec; - - gettimeofday(&this_time, NULL); - diff_sec = this_time.tv_sec - last_time.tv_sec; - diff_usec = this_time.tv_usec - last_time.tv_usec; - - retval = (diff_sec * 1000) + (diff_usec / 1000); + int64_t this_time = get_time_ms(); + retval = this_time - last_time; /* do not update last_time if interval was too short */ - if(retval >= UPDATE_SPEED_MS) { + if(retval < 0 || retval >= UPDATE_SPEED_MS) { last_time = this_time; } } @@ -647,7 +659,7 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total) { static double rate_last; static off_t xfered_last; - static struct timeval initial_time; + static int64_t initial_time = 0; int infolen; int filenamelen; char *fname, *p; @@ -658,7 +670,6 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total) int totaldownload = 0; off_t xfered, total; double rate = 0.0; - long timediff = 0; unsigned int eta_h = 0, eta_m = 0, eta_s = 0; double rate_human, xfered_human; const char *rate_label, *xfered_label; @@ -709,21 +720,14 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total) /* set default starting values, ensure we only call this once * if TotalDownload is enabled */ if(!totaldownload || (totaldownload && list_xfered == 0)) { - gettimeofday(&initial_time, NULL); + initial_time = get_time_ms(); xfered_last = (off_t)0; rate_last = 0.0; get_update_timediff(1); } } else if(file_xfered == file_total) { /* compute final values */ - struct timeval current_time; - time_t diff_sec; - suseconds_t diff_usec; - - gettimeofday(¤t_time, NULL); - diff_sec = current_time.tv_sec - initial_time.tv_sec; - diff_usec = current_time.tv_usec - initial_time.tv_usec; - timediff = (diff_sec * 1000) + (diff_usec / 1000); + int64_t timediff = get_time_ms() - initial_time; if(timediff > 0) { rate = (double)xfered / (timediff / 1000.0); /* round elapsed time (in ms) to the nearest second */ @@ -733,7 +737,7 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total) } } else { /* compute current average values */ - timediff = get_update_timediff(0); + int64_t timediff = get_update_timediff(0); if(timediff < UPDATE_SPEED_MS) { /* return if the calling interval was too short */ -- cgit v1.2.3-54-g00ecf