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/* ==== bench_read.c ============================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Benchmark reads of /dev/null. Gives a good aprox. of
* syscall times.
*
* 1.00 93/08/01 proven
* -Started coding this file.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include "test.h"
/* ==========================================================================
* usage();
*/
void usage(void)
{
printf("getopt [-d?] [-c count]\n");
errno = 0;
}
main(int argc, char **argv)
{
struct timeval starttime, endtime;
int count = 1000000;
int debug = 0;
int flags;
int fd;
int i;
char word[8192];
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
while ((word[0] = getopt(argc, argv, "c:d?")) != (char)EOF) {
switch (word[0]) {
case 'd':
debug++;
break;
case 'c':
count = atoi(optarg);
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
}
if ((fd = open("/dev/zero", O_RDONLY)) < OK) {
printf("Error: open\n");
exit(0);
}
if (gettimeofday(&starttime, NULL)) {
printf("Error: gettimeofday\n");
exit(0);
}
for (i = 0; i < count; i++) {
if ((flags = fcntl(0, F_GETFL)) < 0) {
perror("fcntl 1st GETFL");
}
}
if (gettimeofday(&endtime, NULL)) {
printf("Error: gettimeofday\n");
exit(0);
}
printf("%d fcntls of /dev/null took %d usecs.\n", count,
(endtime.tv_sec - starttime.tv_sec) * 1000000 +
(endtime.tv_usec - starttime.tv_usec));
}
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