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>
37const char value1[] = "Large ------------------ value";
38const char value2[] = "Small -- value";
39char nameValuePair[] = "less=more";
40const char name[] = "PATH";
41const char name2[] = "SHELL";
42const int MaxIterations = 1000000;
43const char Tabs[] = "\t\t\t";
44
45
46static int
47report_time(const char *action, struct timeval *startTime,
48    struct timeval *endTime)
49{
50	int actionLen;
51	int numTabs;
52
53	actionLen = strlen(action);
54	numTabs = 3 - actionLen / 8;
55
56	return (printf("Time spent executing %s:%.*s%f\n", action, numTabs, Tabs,
57	    (endTime->tv_sec - startTime->tv_sec) +
58	    (double)(endTime->tv_usec - startTime->tv_usec) / 1000000));
59}
60
61
62int
63main(int argc, char **argv)
64{
65	int iterations;
66	struct rusage endUsage;
67	struct rusage startUsage;
68
69	/*
70	 * getenv() on the existing environment.
71	 */
72	getrusage(RUSAGE_SELF, &startUsage);
73
74	/* Iterate over setting variable. */
75	for (iterations = 0; iterations < MaxIterations; iterations++)
76		if (getenv(name) == NULL)
77			err(EXIT_FAILURE, "getenv(name)");
78
79	getrusage(RUSAGE_SELF, &endUsage);
80
81	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
82
83
84	/*
85	 * setenv() a variable with a large value.
86	 */
87	getrusage(RUSAGE_SELF, &startUsage);
88
89	/* Iterate over setting variable. */
90	for (iterations = 0; iterations < MaxIterations; iterations++)
91		if (setenv(name, value1, 1) == -1)
92			err(EXIT_FAILURE, "setenv(name, value1, 1)");
93
94	getrusage(RUSAGE_SELF, &endUsage);
95
96	report_time("setenv(name, value1, 1)", &startUsage.ru_utime,
97	    &endUsage.ru_utime);
98
99
100	/*
101	 * getenv() the new variable on the new environment.
102	 */
103	getrusage(RUSAGE_SELF, &startUsage);
104
105	/* Iterate over setting variable. */
106	for (iterations = 0; iterations < MaxIterations; iterations++)
107		/* Set large value to variable. */
108		if (getenv(name) == NULL)
109			err(EXIT_FAILURE, "getenv(name)");
110
111	getrusage(RUSAGE_SELF, &endUsage);
112
113	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
114
115
116	/*
117	 * getenv() a different variable on the new environment.
118	 */
119	getrusage(RUSAGE_SELF, &startUsage);
120
121	/* Iterate over setting variable. */
122	for (iterations = 0; iterations < MaxIterations; iterations++)
123		/* Set large value to variable. */
124		if (getenv(name2) == NULL)
125			err(EXIT_FAILURE, "getenv(name2)");
126
127	getrusage(RUSAGE_SELF, &endUsage);
128
129	report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
130
131
132	/*
133	 * setenv() a variable with a small value.
134	 */
135	getrusage(RUSAGE_SELF, &startUsage);
136
137	/* Iterate over setting variable. */
138	for (iterations = 0; iterations < MaxIterations; iterations++)
139		if (setenv(name, value2, 1) == -1)
140			err(EXIT_FAILURE, "setenv(name, value2, 1)");
141
142	getrusage(RUSAGE_SELF, &endUsage);
143
144	report_time("setenv(name, value2, 1)", &startUsage.ru_utime,
145	    &endUsage.ru_utime);
146
147
148	/*
149	 * getenv() a different variable on the new environment.
150	 */
151	getrusage(RUSAGE_SELF, &startUsage);
152
153	/* Iterate over setting variable. */
154	for (iterations = 0; iterations < MaxIterations; iterations++)
155		/* Set large value to variable. */
156		if (getenv(name2) == NULL)
157			err(EXIT_FAILURE, "getenv(name)");
158
159	getrusage(RUSAGE_SELF, &endUsage);
160
161	report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
162
163
164	/*
165	 * getenv() a different variable on the new environment.
166	 */
167	getrusage(RUSAGE_SELF, &startUsage);
168
169	/* Iterate over setting variable. */
170	for (iterations = 0; iterations < MaxIterations; iterations++)
171		/* Set large value to variable. */
172		if (getenv(name2) == NULL)
173			err(EXIT_FAILURE, "getenv(name2)");
174
175	getrusage(RUSAGE_SELF, &endUsage);
176
177	report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
178
179
180	/*
181	 * putenv() a variable with a small value.
182	 */
183	getrusage(RUSAGE_SELF, &startUsage);
184
185	/* Iterate over setting variable. */
186	for (iterations = 0; iterations < MaxIterations; iterations++)
187		if (putenv(nameValuePair) == -1)
188			err(EXIT_FAILURE, "putenv(nameValuePair)");
189
190	getrusage(RUSAGE_SELF, &endUsage);
191
192	report_time("putenv(nameValuePair)", &startUsage.ru_utime,
193	    &endUsage.ru_utime);
194
195
196	exit(EXIT_SUCCESS);
197}
198