b52c534bff
Normally, count=n means read(2) will be called n times on the input to dd. If the read() returns short, as may happen when reading from a pipe, fewer bytes will be copied from the input. With conv=sync the buffer is padded with zeros to fill the rest of the block. iflag=fullblock causes dd to continue reading until the block is full, so that count=n means n full blocks are copied. This flag is compatible with illumos and GNU dd and is used in the ZFS test suite. Submitted by: Ryan Moeller Reviewed by: manpages, mmacy@ MFC after: 1 week Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D21441
114 lines
4.5 KiB
C
114 lines
4.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego and Lance
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* Visser of Convex Computer Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)dd.h 8.3 (Berkeley) 4/2/94
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* $FreeBSD$
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*/
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/* Input/output stream state. */
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typedef struct {
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u_char *db; /* buffer address */
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u_char *dbp; /* current buffer I/O address */
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ssize_t dbcnt; /* current buffer byte count */
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ssize_t dbrcnt; /* last read byte count */
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ssize_t dbsz; /* block size */
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#define ISCHR 0x01 /* character device (warn on short) */
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#define ISPIPE 0x02 /* pipe-like (see position.c) */
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#define ISTAPE 0x04 /* tape */
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#define ISSEEK 0x08 /* valid to seek on */
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#define NOREAD 0x10 /* not readable */
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#define ISTRUNC 0x20 /* valid to ftruncate() */
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u_int flags;
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const char *name; /* name */
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int fd; /* file descriptor */
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off_t offset; /* # of blocks to skip */
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off_t seek_offset; /* offset of last seek past output hole */
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} IO;
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typedef struct {
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uintmax_t in_full; /* # of full input blocks */
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uintmax_t in_part; /* # of partial input blocks */
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uintmax_t out_full; /* # of full output blocks */
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uintmax_t out_part; /* # of partial output blocks */
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uintmax_t trunc; /* # of truncated records */
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uintmax_t swab; /* # of odd-length swab blocks */
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uintmax_t bytes; /* # of bytes written */
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struct timespec start; /* start time of dd */
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} STAT;
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/* Flags (in ddflags). */
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#define C_ASCII 0x0000000000000001ULL
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#define C_BLOCK 0x0000000000000002ULL
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#define C_BS 0x0000000000000004ULL
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#define C_CBS 0x0000000000000008ULL
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#define C_COUNT 0x0000000000000010ULL
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#define C_EBCDIC 0x0000000000000020ULL
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#define C_FILES 0x0000000000000040ULL
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#define C_IBS 0x0000000000000080ULL
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#define C_IF 0x0000000000000100ULL
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#define C_LCASE 0x0000000000000200ULL
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#define C_NOERROR 0x0000000000000400ULL
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#define C_NOTRUNC 0x0000000000000800ULL
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#define C_OBS 0x0000000000001000ULL
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#define C_OF 0x0000000000002000ULL
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#define C_OSYNC 0x0000000000004000ULL
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#define C_PAREVEN 0x0000000000008000ULL
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#define C_PARNONE 0x0000000000010000ULL
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#define C_PARODD 0x0000000000020000ULL
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#define C_PARSET 0x0000000000040000ULL
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#define C_SEEK 0x0000000000080000ULL
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#define C_SKIP 0x0000000000100000ULL
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#define C_SPARSE 0x0000000000200000ULL
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#define C_SWAB 0x0000000000400000ULL
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#define C_SYNC 0x0000000000800000ULL
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#define C_UCASE 0x0000000001000000ULL
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#define C_UNBLOCK 0x0000000002000000ULL
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#define C_FILL 0x0000000004000000ULL
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#define C_STATUS 0x0000000008000000ULL
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#define C_NOXFER 0x0000000010000000ULL
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#define C_NOINFO 0x0000000020000000ULL
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#define C_PROGRESS 0x0000000040000000ULL
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#define C_FSYNC 0x0000000080000000ULL
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#define C_FDATASYNC 0x0000000100000000ULL
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#define C_OFSYNC 0x0000000200000000ULL
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#define C_IFULLBLOCK 0x0000000400000000ULL
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#define C_PARITY (C_PAREVEN | C_PARODD | C_PARNONE | C_PARSET)
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#define BISZERO(p, s) ((s) > 0 && *((const char *)p) == 0 && !memcmp( \
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(const void *)(p), (const void *) \
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((const char *)p + 1), (s) - 1))
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