1/*-
2 * Copyright (c) 2007 Sean C. Farley <scf@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26#include <sys/types.h>
27#include <sys/time.h>
28#include <sys/resource.h>
29#include <err.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <unistd.h>
34
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39
40const char value1[] = "Large ------------------ value";
41const char value2[] = "Small -- value";
42char nameValuePair[] = "less=more";
43const char name[] = "PATH";
44const char name2[] = "SHELL";
45const int MaxIterations = 1000000;
46const char Tabs[] = "\t\t\t";
47
48
49static int
50report_time(const char *action, struct timeval *startTime,
51    struct timeval *endTime)
52{
53	int actionLen;
54	int numTabs;
55
56	actionLen = strlen(action);
57	numTabs = 3 - actionLen / 8;
58
59	return (printf("Time spent executing %s:%.*s%f\n", action, numTabs, Tabs,
60	    (endTime->tv_sec - startTime->tv_sec) +
61	    (double)(endTime->tv_usec - startTime->tv_usec) / 1000000));
62}
63
64
65int
66main(int argc, char **argv)
67{
68	int iterations;
69	struct rusage endUsage;
70	struct rusage startUsage;
71
72	/*
73	 * getenv() on the existing environment.
74	 */
75	getrusage(RUSAGE_SELF, &startUsage);
76
77	/* Iterate over setting variable. */
78	for (iterations = 0; iterations < MaxIterations; iterations++)
79		if (getenv(name) == NULL)
80			err(EXIT_FAILURE, "getenv(name)");
81
82	getrusage(RUSAGE_SELF, &endUsage);
83
84	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
85
86
87	/*
88	 * setenv() a variable with a large value.
89	 */
90	getrusage(RUSAGE_SELF, &startUsage);
91
92	/* Iterate over setting variable. */
93	for (iterations = 0; iterations < MaxIterations; iterations++)
94		if (setenv(name, value1, 1) == -1)
95			err(EXIT_FAILURE, "setenv(name, value1, 1)");
96
97	getrusage(RUSAGE_SELF, &endUsage);
98
99	report_time("setenv(name, value1, 1)", &startUsage.ru_utime,
100	    &endUsage.ru_utime);
101
102
103	/*
104	 * getenv() the new variable on the new environment.
105	 */
106	getrusage(RUSAGE_SELF, &startUsage);
107
108	/* Iterate over setting variable. */
109	for (iterations = 0; iterations < MaxIterations; iterations++)
110		/* Set large value to variable. */
111		if (getenv(name) == NULL)
112			err(EXIT_FAILURE, "getenv(name)");
113
114	getrusage(RUSAGE_SELF, &endUsage);
115
116	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
117
118
119	/*
120	 * getenv() a different variable on the new environment.
121	 */
122	getrusage(RUSAGE_SELF, &startUsage);
123
124	/* Iterate over setting variable. */
125	for (iterations = 0; iterations < MaxIterations; iterations++)
126		/* Set large value to variable. */
127		if (getenv(name2) == NULL)
128			err(EXIT_FAILURE, "getenv(name2)");
129
130	getrusage(RUSAGE_SELF, &endUsage);
131
132	report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
133
134
135	/*
136	 * setenv() a variable with a small value.
137	 */
138	getrusage(RUSAGE_SELF, &startUsage);
139
140	/* Iterate over setting variable. */
141	for (iterations = 0; iterations < MaxIterations; iterations++)
142		if (setenv(name, value2, 1) == -1)
143			err(EXIT_FAILURE, "setenv(name, value2, 1)");
144
145	getrusage(RUSAGE_SELF, &endUsage);
146
147	report_time("setenv(name, value2, 1)", &startUsage.ru_utime,
148	    &endUsage.ru_utime);
149
150
151	/*
152	 * getenv() a different variable on the new environment.
153	 */
154	getrusage(RUSAGE_SELF, &startUsage);
155
156	/* Iterate over setting variable. */
157	for (iterations = 0; iterations < MaxIterations; iterations++)
158		/* Set large value to variable. */
159		if (getenv(name2) == NULL)
160			err(EXIT_FAILURE, "getenv(name)");
161
162	getrusage(RUSAGE_SELF, &endUsage);
163
164	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
165
166
167	/*
168	 * getenv() a different variable on the new environment.
169	 */
170	getrusage(RUSAGE_SELF, &startUsage);
171
172	/* Iterate over setting variable. */
173	for (iterations = 0; iterations < MaxIterations; iterations++)
174		/* Set large value to variable. */
175		if (getenv(name2) == NULL)
176			err(EXIT_FAILURE, "getenv(name2)");
177
178	getrusage(RUSAGE_SELF, &endUsage);
179
180	report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
181
182
183	/*
184	 * putenv() a variable with a small value.
185	 */
186	getrusage(RUSAGE_SELF, &startUsage);
187
188	/* Iterate over setting variable. */
189	for (iterations = 0; iterations < MaxIterations; iterations++)
190		if (putenv(nameValuePair) == -1)
191			err(EXIT_FAILURE, "putenv(nameValuePair)");
192
193	getrusage(RUSAGE_SELF, &endUsage);
194
195	report_time("putenv(nameValuePair)", &startUsage.ru_utime,
196	    &endUsage.ru_utime);
197
198
199	exit(EXIT_SUCCESS);
200}
201