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93 lines
1.7 KiB
93 lines
1.7 KiB
/* random-access.c (GPL)*/
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/* Hironobu SUZUKI <hironobu@h2np.net> */
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#include <stdio.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <time.h>
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#include <stdlib.h>
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#define FAIL 0
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#define SUCCESS 1
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int openlog[2] = { 0, 0 };
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#define MAXNUM 0x100000
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void open_read_close(char *fname);
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int nullfd;
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int main(int ac, char **av)
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{
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int r;
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char fname[1024];
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time_t t;
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int i;
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int m;
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if (ac != 2) {
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printf("%s hex-style-filename \n", av[0]);
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printf("ex) %s 00022300\n", av[0]);
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exit(1);
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}
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sscanf(av[1], "%x", &m);
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if (m < 1 || m > MAXNUM) {
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printf("out of size %d\n", m);
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exit(1);
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}
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time(&t);
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srandom((unsigned int)getpid() ^
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(((unsigned int)t << 16) | (unsigned int)t >> 16));
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if ((nullfd = open("/dev/null", O_WRONLY)) < 0) {
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perror("/dev/null");
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exit(1);
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}
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/* 00/00/00/00 */
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for (i = 0; i < m; i++) {
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r = random() % m;
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sprintf(fname, "00/%2.2x/%2.2x/00%2.2x%2.2x%2.2x",
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((r >> 16) & 0xFF),
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((r >> 8) & 0xFF),
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((r >> 16) & 0xFF), ((r >> 8) & 0xFF), (r & 0xFF));
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open_read_close(fname);
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}
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close(nullfd);
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printf("Success:\t%d\nFail:\t%d\n", openlog[SUCCESS], openlog[FAIL]);
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exit(0);
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}
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#define BUFS 8192
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void open_read_close(char *fname)
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{
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int fd;
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char buf[BUFS];
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int c;
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if ((fd = open(fname, O_RDONLY)) < 0) {
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openlog[FAIL]++;
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close(fd);
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return;
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}
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openlog[SUCCESS]++;
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while ((c = read(fd, buf, BUFS)) > 0) {
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if (write(nullfd, buf, c) < 0) {
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perror("/dev/null");
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printf("Opened\t %d\nUnopend:\t%d\n", openlog[SUCCESS],
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openlog[FAIL]);
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exit(1);
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}
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}
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if (c < 0) {
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perror(fname);
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printf("Opened\t %d\nUnopend:\t%d\n", openlog[SUCCESS],
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openlog[FAIL]);
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exit(1);
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}
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close(fd);
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}
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