| /* |
| * Copyright (c) 2000-2003 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "global.h" |
| |
| int |
| main(int argc, char **argv) |
| { |
| off_t offset = 0; |
| int blksize = 4096; |
| long long maxblks = -1; /* no limit */ |
| long long nblks = 0; |
| int value = 0; |
| int sts = 0; |
| int fd; |
| char *z; |
| char *path; |
| int oflags = O_WRONLY; |
| |
| char *progname; |
| |
| if (strrchr(argv[0],'/')) |
| progname = strrchr(argv[0],'/')+1; |
| else |
| progname = argv[0]; |
| |
| while ((fd = getopt(argc, argv, "b:n:o:v:ct")) != EOF) { |
| switch (fd) { |
| case 'b': |
| blksize = atoi(optarg) * 512; |
| break; |
| case 'n': |
| maxblks = atoll(optarg); |
| break; |
| case 'o': |
| offset = atoll(optarg); |
| break; |
| case 'v': |
| value = atoi(optarg); |
| break; |
| case 'c': |
| oflags |= O_CREAT; |
| break; |
| case 't': |
| oflags |= O_TRUNC; |
| break; |
| default: |
| sts++; |
| } |
| } |
| if (sts || argc - optind != 1) { |
| fprintf(stderr, |
| "Usage: %s [-b N*512] [-n N] [-o off] [-v val] " |
| " [-c] [-t] <dev/file>\n", |
| progname); |
| fprintf(stderr," -c: create -t: truncate\n"); |
| exit(1); |
| } |
| |
| path = argv[optind]; |
| |
| if ((fd = open(path, oflags, 0600)) < 0) { |
| fprintf(stderr, |
| "error opening \"%s\": %s\n", |
| path, strerror(errno)); |
| exit(1); |
| } |
| if ((lseek64(fd, offset, SEEK_SET)) < 0) { |
| fprintf(stderr, "%s: error seeking to offset %llu " |
| "on \"%s\": %s\n", |
| progname, (unsigned long long)offset, path, strerror(errno)); |
| exit(1); |
| } |
| |
| if ((z = memalign(getpagesize(), blksize)) == NULL) { |
| fprintf(stderr, "%s: can't memalign %u bytes: %s\n", |
| progname, blksize, strerror(errno)); |
| exit(1); |
| } |
| memset(z, value, blksize); |
| errno = 0; |
| for (;;) { |
| if (nblks++ == maxblks) |
| break; |
| if ((sts = write(fd, z, blksize)) < blksize) { |
| if (errno == ENOSPC || sts >= 0) |
| break; |
| fprintf(stderr, "%s: write failed: %s\n", |
| progname, strerror(errno)); |
| break; |
| } |
| } |
| printf("Wrote %.2fKb (value 0x%x)\n", |
| (double) ((--nblks) * blksize) / 1024, value); |
| free(z); |
| return 0; |
| } |