/*-
* Copyright (c) 2007 Sean C. Farley <scf@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/cdefs.h>
const char value1[] = "Large ------------------ value";
const char value2[] = "Small -- value";
char nameValuePair[] = "less=more";
const char name[] = "PATH";
const char name2[] = "SHELL";
const int MaxIterations = 1000000;
const char Tabs[] = "\t\t\t";
static int
report_time(const char *action, struct timeval *startTime,
struct timeval *endTime)
{
int actionLen;
int numTabs;
actionLen = strlen(action);
numTabs = 3 - actionLen / 8;
return (printf("Time spent executing %s:%.*s%f\n", action, numTabs, Tabs,
(endTime->tv_sec - startTime->tv_sec) +
(double)(endTime->tv_usec - startTime->tv_usec) / 1000000));
}
int
main(int argc, char **argv)
{
int iterations;
struct rusage endUsage;
struct rusage startUsage;
/*
* getenv() on the existing environment.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
if (getenv(name) == NULL)
err(EXIT_FAILURE, "getenv(name)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
/*
* setenv() a variable with a large value.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
if (setenv(name, value1, 1) == -1)
err(EXIT_FAILURE, "setenv(name, value1, 1)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("setenv(name, value1, 1)", &startUsage.ru_utime,
&endUsage.ru_utime);
/*
* getenv() the new variable on the new environment.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
/* Set large value to variable. */
if (getenv(name) == NULL)
err(EXIT_FAILURE, "getenv(name)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
/*
* getenv() a different variable on the new environment.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
/* Set large value to variable. */
if (getenv(name2) == NULL)
err(EXIT_FAILURE, "getenv(name2)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
/*
* setenv() a variable with a small value.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
if (setenv(name, value2, 1) == -1)
err(EXIT_FAILURE, "setenv(name, value2, 1)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("setenv(name, value2, 1)", &startUsage.ru_utime,
&endUsage.ru_utime);
/*
* getenv() a different variable on the new environment.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
/* Set large value to variable. */
if (getenv(name2) == NULL)
err(EXIT_FAILURE, "getenv(name)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("getenv(name)", &startUsage.ru_utime, &endUsage.ru_utime);
/*
* getenv() a different variable on the new environment.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
/* Set large value to variable. */
if (getenv(name2) == NULL)
err(EXIT_FAILURE, "getenv(name2)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("getenv(name2)", &startUsage.ru_utime, &endUsage.ru_utime);
/*
* putenv() a variable with a small value.
*/
getrusage(RUSAGE_SELF, &startUsage);
/* Iterate over setting variable. */
for (iterations = 0; iterations < MaxIterations; iterations++)
if (putenv(nameValuePair) == -1)
err(EXIT_FAILURE, "putenv(nameValuePair)");
getrusage(RUSAGE_SELF, &endUsage);
report_time("putenv(nameValuePair)", &startUsage.ru_utime,
&endUsage.ru_utime);
exit(EXIT_SUCCESS);
}
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