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patch 8.2.3510: changes are only detected with one second accuracy

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Problem:    Changes are only detected with one second accuracy.
Solution:   Use the nanosecond time if possible.  (Leah Neukirchen,
            closes #8873, closes #8875)
This commit is contained in:
Leah Neukirchen
2021-10-14 21:27:55 +01:00
committed by Bram Moolenaar
parent 340dd0fbe4
commit 0a7984af56
13 changed files with 151 additions and 6 deletions
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24
src/fileio.c
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@@ -408,6 +408,7 @@ readfile(
{
buf_store_time(curbuf, &st, fname);
curbuf->b_mtime_read = curbuf->b_mtime;
curbuf->b_mtime_read_ns = curbuf->b_mtime_ns;
filesize_disk = st.st_size;
#ifdef UNIX
/*
@@ -432,7 +433,9 @@ readfile(
else
{
curbuf->b_mtime = 0;
curbuf->b_mtime_ns = 0;
curbuf->b_mtime_read = 0;
curbuf->b_mtime_read_ns = 0;
curbuf->b_orig_size = 0;
curbuf->b_orig_mode = 0;
}
@@ -2569,6 +2572,7 @@ failed:
{
buf_store_time(curbuf, &st, fname);
curbuf->b_mtime_read = curbuf->b_mtime;
curbuf->b_mtime_read_ns = curbuf->b_mtime_ns;
}
#endif
}
@@ -3115,15 +3119,19 @@ msg_add_eol(void)
}
int
time_differs(long t1, long t2)
time_differs(stat_T *st, long mtime, long mtime_ns UNUSED)
{
#if defined(__linux__) || defined(MSWIN)
// On a FAT filesystem, esp. under Linux, there are only 5 bits to store
// the seconds. Since the roundoff is done when flushing the inode, the
// time may change unexpectedly by one second!!!
return (t1 - t2 > 1 || t2 - t1 > 1);
return (long)st->st_mtime - mtime > 1 || mtime - (long)st->st_mtime > 1
# ifdef ST_MTIM_NSEC
|| (long)st->ST_MTIM_NSEC != mtime_ns
# endif
;
#else
return (t1 != t2);
return (long)st->st_mtime != mtime;
#endif
}
@@ -4072,7 +4080,7 @@ buf_check_timestamp(
if ( !(buf->b_flags & BF_NOTEDITED)
&& buf->b_mtime != 0
&& ((stat_res = mch_stat((char *)buf->b_ffname, &st)) < 0
|| time_differs((long)st.st_mtime, buf->b_mtime)
|| time_differs(&st, buf->b_mtime, buf->b_mtime_ns)
|| st.st_size != buf->b_orig_size
#ifdef HAVE_ST_MODE
|| (int)st.st_mode != buf->b_orig_mode
@@ -4187,9 +4195,12 @@ buf_check_timestamp(
mesg2 = _("See \":help W16\" for more info.");
}
else
{
// Only timestamp changed, store it to avoid a warning
// in check_mtime() later.
buf->b_mtime_read = buf->b_mtime;
buf->b_mtime_read_ns = buf->b_mtime_ns;
}
}
}
}
@@ -4468,6 +4479,11 @@ buf_reload(buf_T *buf, int orig_mode)
buf_store_time(buf_T *buf, stat_T *st, char_u *fname UNUSED)
{
buf->b_mtime = (long)st->st_mtime;
#ifdef ST_MTIM_NSEC
buf->b_mtime_ns = (long)st->ST_MTIM_NSEC;
#else
buf->b_mtime_ns = 0;
#endif
buf->b_orig_size = st->st_size;
#ifdef HAVE_ST_MODE
buf->b_orig_mode = (int)st->st_mode;