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: stable/9/tools/regression/environ/timings.c 171525 2007-07-20 23:30:13Z scf $");
38
39
40 const char value1[] = "Large ------------------ value";
41 const char value2[] = "Small -- value";
42 char nameValuePair[] = "less=more";
43 const char name[] = "PATH";
44 const char name2[] = "SHELL";
45 const int MaxIterations = 1000000;
46 const char Tabs[] = "\t\t\t";
47
48
49 static int
report_time(const char * action,struct timeval * startTime,struct timeval * endTime)50 report_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
65 int
main(int argc,char ** argv)66 main(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