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modified post c9be by Anonymous on Sat 17th Sep 2022 15:20
original post 78a by Anonymous on Wed 14th Sep 2022 19:02
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#!/usr/bin/ksh93

	1	+	#!/usr/bin/ksh93
1	2
2		-	/*
	3	+	#
3		-	* count_timer_syscalls.c - runs timer 1000 times, strace can count syscalls
	4	+	# Count timer syscalls
4		-	*
	5	+	#
5		-	*/
	6	+	# Tests whether clock_gettime() is implemented via traditional
	7	+	# syscalls or uses a shortcut (e.g. via shared memory/Linux VDSO)
6	9
7		-	#include <sys/types.h>
	10	+	builtin cat
8		-	#include <sys/stat.h>
	11	+	builtin wc
9		-	#include <fcntl.h>
	12	+	#builtin rm
18	13
	14	+	set -o nounset
19	15
20		-	#ifndef CLOCK_INVALID
	16	+	function enumerate_clock_sources
	17	+	{
23	21
24		-	#define NSEC_PER_SEC (1000000000LL)
	22	+	s="$( clang -E -dM -m32 -include time.h - < '/dev/null' \| \
	23	+	egrep \
25	26
26		-
	27	+	while read dummy aname avalue ; do
27		-	static
	28	+	if [[ \
28		-	clockid_t get_clockid(int fd)
	29	+	"${aname}" != ~(El)CLOCK_ \|\| \
29		-	{
	30	+	"${avalue}" != ~(Elr)[[:digit:]]+ ]] ; then
30		-	const int CLOCKFD = 3;
	31	+	continue
	32	+	fi
31	37
32		-	return (((unsigned int) ~fd) << 3) \| CLOCKFD;
	38	+	return 0
33	39		}
34	40
	41	+	function generate_test_code
35	44
36		-	static
	45	+	set -o errexit
41	46
42		-	for(cycles = 0UL ; cycles < num_cycles ; cycles++)
	47	+	printf $"## Generating test code...\n"
48	48
	49	+	rm -f \
49	52
51	53		{
52		-	const char *clockname = av[1];
	54	+	cat <<EOF
53	55
54		-	(void)puts("# start.");
	56	+	/*
	57	+	* count_timer_syscalls.c - runs timer NUM_TESTRUNS times,
55	64
56		-	if ((ac != 2) \|\| (!clockname)) {
	65	+	#include <sys/types.h>
57		-	(void)fprintf(stderr, "%s: Missing clockname argument\n", av[0]);
	66	+	#include <sys/stat.h>
58		-	return EXIT_FAILURE;
	67	+	#include <fcntl.h>
59		-	}
	68	+	#include <unistd.h>
	69	+	#include <time.h>
60	76
65	77
66		-	/*
	78	+	#ifndef CLOCK_INVALID
67		-	* count_timer_syscalls.c - runs timer 1000 times, strace can count syscalls
	79	+	#define CLOCK_INVALID -1
68		-	*
	80	+	#endif
70	81
71		-	#include <sys/types.h>
	82	+	#define NSEC_PER_SEC (1000000000LL)
72		-	#include <sys/stat.h>
	83	+
73		-	#include <fcntl.h>
	84	+	#define NUM_TESTRUNS (32000UL)
82	85
83	86
84		-	#ifndef CLOCK_INVALID
85		-	#define CLOCK_INVALID -1
86		-	#endif
87		-
88		-	#define NSEC_PER_SEC (1000000000LL)
89		-
90		-
	87	+	static