From 459be35234cc24b69309eb0ee22600024c73713e Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Sun, 17 Jun 2007 19:09:05 +0000 Subject: 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 --- libbb/time.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 libbb/time.c (limited to 'libbb/time.c') 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 + +/* 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 -- cgit v1.2.3