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authorAndrew Gregory <andrew.gregory.8@gmail.com>2014-06-28 13:41:39 -0400
committerAllan McRae <allan@archlinux.org>2014-06-29 11:14:42 +1000
commite0a7682607256ef24b5d2d58212c4b958cce0dce (patch)
tree88e95da6a82dbe91e970ac6830c6543578812a18 /src
parente05fd5e060cf5a4a71d5d8a65db7b39876d67726 (diff)
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 <andrew.gregory.8@gmail.com> Signed-off-by: Allan McRae <allan@archlinux.org>
Diffstat (limited to 'src')
-rw-r--r--src/pacman/callback.c58
1 files changed, 31 insertions, 27 deletions
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 <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/time.h>
+#include <sys/time.h> /* gettimeofday */
#include <sys/types.h> /* off_t */
+#include <stdint.h> /* int64_t */
#include <time.h>
#include <unistd.h>
#include <wchar.h>
@@ -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(&current_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 */