svn commit: trunk/busybox: include libbb shell
vda at busybox.net
vda at busybox.net
Sun Jun 29 02:25:54 UTC 2008
Author: vda
Date: 2008-06-28 19:25:53 -0700 (Sat, 28 Jun 2008)
New Revision: 22558
Log:
libbb: shrink monotonic_XXX functions, introduce monotonic_ns
(unused for now)
function old new delta
get_mono - 31 +31
sv_main 1228 1234 +6
expand 1693 1697 +4
get_address 178 181 +3
utoa_to_buf 108 110 +2
builtin_exit 46 48 +2
qrealloc 36 33 -3
qgravechar 109 106 -3
ash_main 1383 1380 -3
grep_file 850 846 -4
popstring 140 134 -6
monotonic_us 85 60 -25
monotonic_sec 41 16 -25
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 5/7 up/down: 48/-69) Total: -21 bytes
Modified:
trunk/busybox/include/libbb.h
trunk/busybox/libbb/time.c
trunk/busybox/shell/ash.c
Changeset:
Modified: trunk/busybox/include/libbb.h
===================================================================
--- trunk/busybox/include/libbb.h 2008-06-29 00:32:35 UTC (rev 22557)
+++ trunk/busybox/include/libbb.h 2008-06-29 02:25:53 UTC (rev 22558)
@@ -237,6 +237,7 @@
#define errno (*bb_errno)
#endif
+unsigned long long monotonic_ns(void) FAST_FUNC;
unsigned long long monotonic_us(void) FAST_FUNC;
unsigned monotonic_sec(void) FAST_FUNC;
Modified: trunk/busybox/libbb/time.c
===================================================================
--- trunk/busybox/libbb/time.c 2008-06-29 00:32:35 UTC (rev 22557)
+++ trunk/busybox/libbb/time.c 2008-06-29 02:25:53 UTC (rev 22558)
@@ -10,8 +10,8 @@
#include "libbb.h"
#if ENABLE_MONOTONIC_SYSCALL
+
#include <sys/syscall.h>
-
/* Old glibc (< 2.3.4) does not provide this constant. We use syscall
* directly so this definition is safe. */
#ifndef CLOCK_MONOTONIC
@@ -20,30 +20,47 @@
/* libc has incredibly messy way of doing this,
* typically requiring -lrt. We just skip all this mess */
+static void get_mono(struct timespec *ts)
+{
+ if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
+ bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
+}
+unsigned long long FAST_FUNC monotonic_ns(void)
+{
+ struct timespec ts;
+ get_mono(&ts);
+ return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+}
unsigned long long FAST_FUNC monotonic_us(void)
{
struct timespec ts;
- if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts))
- bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
+ get_mono(&ts);
return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
}
unsigned FAST_FUNC monotonic_sec(void)
{
struct timespec ts;
- if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts))
- bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
+ get_mono(&ts);
return ts.tv_sec;
}
+
#else
+
+unsigned long long FAST_FUNC monotonic_ns(void)
+{
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
+}
unsigned long long FAST_FUNC monotonic_us(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000ULL + tv.tv_usec;
}
-
unsigned FAST_FUNC monotonic_sec(void)
{
return time(NULL);
}
+
#endif
Modified: trunk/busybox/shell/ash.c
===================================================================
--- trunk/busybox/shell/ash.c 2008-06-29 00:32:35 UTC (rev 22557)
+++ trunk/busybox/shell/ash.c 2008-06-29 02:25:53 UTC (rev 22558)
@@ -9615,7 +9615,6 @@
}
#if ENABLE_ASH_RANDOM_SUPPORT
-/* Roughly copied from bash.. */
static void
change_random(const char *value)
{
@@ -9636,10 +9635,11 @@
if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
t ^= MASK;
random_galois_LFSR = t;
- /* Both are weak, xoring them gives better randomness
+ /* Both are weak, combining them gives better randomness
* and ~2^64 period. & 0x7fff is probably bash compat
- * for $RANDOM range. */
- t = (t ^ random_LCG) & 0x7fff;
+ * for $RANDOM range. Combining with subtraction is
+ * just for fun. + and ^ would work equally well. */
+ t = (t - random_LCG) & 0x7fff;
/* set without recursion */
setvar(vrandom.text, utoa(t), VNOFUNC);
vrandom.flags &= ~VNOFUNC;
@@ -13432,7 +13432,9 @@
rootpid = getpid();
#if ENABLE_ASH_RANDOM_SUPPORT
- random_galois_LFSR = random_LCG = rootpid + time(NULL);
+ /* Can use monotonic_ns() for better randomness but for now it is
+ * not used anywhere else in busybox... so avoid bloat */
+ random_galois_LFSR = random_LCG = rootpid + monotonic_us();
#endif
init();
setstackmark(&smark);
More information about the busybox-cvs
mailing list