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authorDenis Vlasenko <vda.linux@googlemail.com>2007-06-17 19:09:05 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-06-17 19:09:05 +0000
commit459be35234cc24b69309eb0ee22600024c73713e (patch)
tree15ac4122d9c42ec75ba68d342827e37fcb1306ed /libbb
parente79dd06782175d50f639180cde5b2c56933aa2ee (diff)
downloadbusybox-459be35234cc24b69309eb0ee22600024c73713e.tar.gz
hwclock: size optimizations
libbb/time.c: new file, introducing monotonic_us() pscan, traceroute, arping: use it instead of gettimeofday ping, zcip: TODO function old new delta monotonic_us - 89 +89 find_pair 164 180 +16 .rodata 129747 129763 +16 refresh 1144 1152 +8 ............ timeout 8 4 -4 static.start 8 4 -4 last 8 4 -4 parse_conf 1303 1284 -19 time_main 1149 1124 -25 gettimeofday_us 39 - -39 arping_main 2042 1969 -73 hwclock_main 594 501 -93 catcher 485 380 -105 traceroute_main 4300 4117 -183 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 8/11 up/down: 157/-562) Total: -405 bytes
Diffstat (limited to 'libbb')
-rw-r--r--libbb/Config.in10
-rw-r--r--libbb/Kbuild1
-rw-r--r--libbb/time.c32
3 files changed, 43 insertions, 0 deletions
diff --git a/libbb/Config.in b/libbb/Config.in
index a1ff7c056..0a3769df2 100644
--- a/libbb/Config.in
+++ b/libbb/Config.in
@@ -95,4 +95,14 @@ config FEATURE_EDITING_FANCY_PROMPT
Setting this option allows for prompts to use things like \w and
\$ and escape codes.
+config MONOTONIC_SYSCALL
+ bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
+ default y
+ help
+ Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
+ time intervals (time, ping, traceroute etc need this).
+ Probably requires Linux 2.6+. If not selected, gettimeofday
+ will be used instead (which gives wrong results if date/time
+ is reset).
+
endmenu
diff --git a/libbb/Kbuild b/libbb/Kbuild
index e562f3222..693f6092c 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -78,6 +78,7 @@ lib-y += simplify_path.o
lib-y += skip_whitespace.o
lib-y += speed_table.o
lib-y += str_tolower.o
+lib-y += time.o
lib-y += trim.o
lib-y += u_signal_names.o
lib-y += udp_io.o
diff --git a/libbb/time.c b/libbb/time.c
new file mode 100644
index 000000000..f2a741521
--- /dev/null
+++ b/libbb/time.c
@@ -0,0 +1,32 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2007 Denis Vlasenko
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+#if ENABLE_MONOTONIC_SYSCALL
+#include <sys/syscall.h>
+
+/* libc has incredibly messy way of doing this,
+ * typically requiring -lrt. We just skip all this mess */
+unsigned long long monotonic_us(void)
+{
+ struct timespec ts;
+ if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts))
+ bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
+ return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
+}
+#else
+unsigned long long monotonic_us(void)
+{
+ struct timeval tv;
+ if (gettimeofday(&tv, NULL))
+ bb_error_msg_and_die("gettimeofday failed");
+ return tv.tv_sec * 1000000ULL + tv_usec;
+}
+#endif