f4b4526f23
FreeBSD DD utility has not had support for the O_DIRECT flag, which is useful to bypass local caching, e.g. for unconditionally issuing NFS IO requests during testing. Reviewed by: rgrimes (mentor) Approved by: rgrimes (mentor, blanket) MFC after: 3 weeks Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D25066
645 lines
16 KiB
C
645 lines
16 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Keith Muller of the University of California, San Diego and Lance
|
|
* Visser of Convex Computer Corporation.
|
|
*
|
|
* 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.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*/
|
|
|
|
#if 0
|
|
#ifndef lint
|
|
static char const copyright[] =
|
|
"@(#) Copyright (c) 1991, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)dd.c 8.5 (Berkeley) 4/2/94";
|
|
#endif /* not lint */
|
|
#endif
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/capsicum.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/mtio.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <assert.h>
|
|
#include <capsicum_helpers.h>
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
#include <locale.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "dd.h"
|
|
#include "extern.h"
|
|
|
|
static void dd_close(void);
|
|
static void dd_in(void);
|
|
static void getfdtype(IO *);
|
|
static void setup(void);
|
|
|
|
IO in, out; /* input/output state */
|
|
STAT st; /* statistics */
|
|
void (*cfunc)(void); /* conversion function */
|
|
uintmax_t cpy_cnt; /* # of blocks to copy */
|
|
static off_t pending = 0; /* pending seek if sparse */
|
|
uint64_t ddflags = 0; /* conversion options */
|
|
size_t cbsz; /* conversion block size */
|
|
uintmax_t files_cnt = 1; /* # of files to copy */
|
|
const u_char *ctab; /* conversion table */
|
|
char fill_char; /* Character to fill with if defined */
|
|
size_t speed = 0; /* maximum speed, in bytes per second */
|
|
volatile sig_atomic_t need_summary;
|
|
volatile sig_atomic_t need_progress;
|
|
|
|
int
|
|
main(int argc __unused, char *argv[])
|
|
{
|
|
struct itimerval itv = { { 1, 0 }, { 1, 0 } }; /* SIGALARM every second, if needed */
|
|
|
|
(void)setlocale(LC_CTYPE, "");
|
|
jcl(argv);
|
|
setup();
|
|
|
|
caph_cache_catpages();
|
|
if (caph_enter() < 0)
|
|
err(1, "unable to enter capability mode");
|
|
|
|
(void)signal(SIGINFO, siginfo_handler);
|
|
if (ddflags & C_PROGRESS) {
|
|
(void)signal(SIGALRM, sigalarm_handler);
|
|
setitimer(ITIMER_REAL, &itv, NULL);
|
|
}
|
|
(void)signal(SIGINT, terminate);
|
|
|
|
atexit(summary);
|
|
|
|
while (files_cnt--)
|
|
dd_in();
|
|
|
|
dd_close();
|
|
/*
|
|
* Some devices such as cfi(4) may perform significant amounts
|
|
* of work when a write descriptor is closed. Close the out
|
|
* descriptor explicitly so that the summary handler (called
|
|
* from an atexit() hook) includes this work.
|
|
*/
|
|
if (close(out.fd) == -1 && errno != EINTR)
|
|
err(1, "close");
|
|
exit(0);
|
|
}
|
|
|
|
static int
|
|
parity(u_char c)
|
|
{
|
|
int i;
|
|
|
|
i = c ^ (c >> 1) ^ (c >> 2) ^ (c >> 3) ^
|
|
(c >> 4) ^ (c >> 5) ^ (c >> 6) ^ (c >> 7);
|
|
return (i & 1);
|
|
}
|
|
|
|
static void
|
|
setup(void)
|
|
{
|
|
u_int cnt;
|
|
int iflags, oflags;
|
|
cap_rights_t rights;
|
|
unsigned long cmds[] = { FIODTYPE, MTIOCTOP };
|
|
|
|
if (in.name == NULL) {
|
|
in.name = "stdin";
|
|
in.fd = STDIN_FILENO;
|
|
} else {
|
|
iflags = 0;
|
|
if (ddflags & C_IDIRECT)
|
|
iflags |= O_DIRECT;
|
|
in.fd = open(in.name, O_RDONLY | iflags, 0);
|
|
if (in.fd == -1)
|
|
err(1, "%s", in.name);
|
|
}
|
|
|
|
getfdtype(&in);
|
|
|
|
cap_rights_init(&rights, CAP_READ, CAP_SEEK);
|
|
if (caph_rights_limit(in.fd, &rights) == -1)
|
|
err(1, "unable to limit capability rights");
|
|
|
|
if (files_cnt > 1 && !(in.flags & ISTAPE))
|
|
errx(1, "files is not supported for non-tape devices");
|
|
|
|
cap_rights_set(&rights, CAP_FTRUNCATE, CAP_IOCTL, CAP_WRITE);
|
|
if (ddflags & (C_FDATASYNC | C_FSYNC))
|
|
cap_rights_set(&rights, CAP_FSYNC);
|
|
if (out.name == NULL) {
|
|
/* No way to check for read access here. */
|
|
out.fd = STDOUT_FILENO;
|
|
out.name = "stdout";
|
|
if (ddflags & C_OFSYNC) {
|
|
oflags = fcntl(out.fd, F_GETFL);
|
|
if (oflags == -1)
|
|
err(1, "unable to get fd flags for stdout");
|
|
oflags |= O_FSYNC;
|
|
if (fcntl(out.fd, F_SETFL, oflags) == -1)
|
|
err(1, "unable to set fd flags for stdout");
|
|
}
|
|
} else {
|
|
oflags = O_CREAT;
|
|
if (!(ddflags & (C_SEEK | C_NOTRUNC)))
|
|
oflags |= O_TRUNC;
|
|
if (ddflags & C_OFSYNC)
|
|
oflags |= O_FSYNC;
|
|
if (ddflags & C_ODIRECT)
|
|
oflags |= O_DIRECT;
|
|
out.fd = open(out.name, O_RDWR | oflags, DEFFILEMODE);
|
|
/*
|
|
* May not have read access, so try again with write only.
|
|
* Without read we may have a problem if output also does
|
|
* not support seeks.
|
|
*/
|
|
if (out.fd == -1) {
|
|
out.fd = open(out.name, O_WRONLY | oflags, DEFFILEMODE);
|
|
out.flags |= NOREAD;
|
|
cap_rights_clear(&rights, CAP_READ);
|
|
}
|
|
if (out.fd == -1)
|
|
err(1, "%s", out.name);
|
|
}
|
|
|
|
getfdtype(&out);
|
|
|
|
if (caph_rights_limit(out.fd, &rights) == -1)
|
|
err(1, "unable to limit capability rights");
|
|
if (caph_ioctls_limit(out.fd, cmds, nitems(cmds)) == -1)
|
|
err(1, "unable to limit capability rights");
|
|
|
|
if (in.fd != STDIN_FILENO && out.fd != STDIN_FILENO) {
|
|
if (caph_limit_stdin() == -1)
|
|
err(1, "unable to limit capability rights");
|
|
}
|
|
|
|
if (in.fd != STDOUT_FILENO && out.fd != STDOUT_FILENO) {
|
|
if (caph_limit_stdout() == -1)
|
|
err(1, "unable to limit capability rights");
|
|
}
|
|
|
|
if (in.fd != STDERR_FILENO && out.fd != STDERR_FILENO) {
|
|
if (caph_limit_stderr() == -1)
|
|
err(1, "unable to limit capability rights");
|
|
}
|
|
|
|
/*
|
|
* Allocate space for the input and output buffers. If not doing
|
|
* record oriented I/O, only need a single buffer.
|
|
*/
|
|
if (!(ddflags & (C_BLOCK | C_UNBLOCK))) {
|
|
if ((in.db = malloc((size_t)out.dbsz + in.dbsz - 1)) == NULL)
|
|
err(1, "input buffer");
|
|
out.db = in.db;
|
|
} else if ((in.db = malloc(MAX((size_t)in.dbsz, cbsz) + cbsz)) == NULL ||
|
|
(out.db = malloc(out.dbsz + cbsz)) == NULL)
|
|
err(1, "output buffer");
|
|
|
|
/* dbp is the first free position in each buffer. */
|
|
in.dbp = in.db;
|
|
out.dbp = out.db;
|
|
|
|
/* Position the input/output streams. */
|
|
if (in.offset)
|
|
pos_in();
|
|
if (out.offset)
|
|
pos_out();
|
|
|
|
/*
|
|
* Truncate the output file. If it fails on a type of output file
|
|
* that it should _not_ fail on, error out.
|
|
*/
|
|
if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK) &&
|
|
out.flags & ISTRUNC)
|
|
if (ftruncate(out.fd, out.offset * out.dbsz) == -1)
|
|
err(1, "truncating %s", out.name);
|
|
|
|
if (ddflags & (C_LCASE | C_UCASE | C_ASCII | C_EBCDIC | C_PARITY)) {
|
|
if (ctab != NULL) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = ctab[cnt];
|
|
} else {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = cnt;
|
|
}
|
|
if ((ddflags & C_PARITY) && !(ddflags & C_ASCII)) {
|
|
/*
|
|
* If the input is not EBCDIC, and we do parity
|
|
* processing, strip input parity.
|
|
*/
|
|
for (cnt = 200; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = casetab[cnt & 0x7f];
|
|
}
|
|
if (ddflags & C_LCASE) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = tolower(casetab[cnt]);
|
|
} else if (ddflags & C_UCASE) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = toupper(casetab[cnt]);
|
|
}
|
|
if ((ddflags & C_PARITY)) {
|
|
/*
|
|
* This should strictly speaking be a no-op, but I
|
|
* wonder what funny LANG settings could get us.
|
|
*/
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = casetab[cnt] & 0x7f;
|
|
}
|
|
if ((ddflags & C_PARSET)) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
casetab[cnt] = casetab[cnt] | 0x80;
|
|
}
|
|
if ((ddflags & C_PAREVEN)) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
if (parity(casetab[cnt]))
|
|
casetab[cnt] = casetab[cnt] | 0x80;
|
|
}
|
|
if ((ddflags & C_PARODD)) {
|
|
for (cnt = 0; cnt <= 0377; ++cnt)
|
|
if (!parity(casetab[cnt]))
|
|
casetab[cnt] = casetab[cnt] | 0x80;
|
|
}
|
|
|
|
ctab = casetab;
|
|
}
|
|
|
|
if (clock_gettime(CLOCK_MONOTONIC, &st.start))
|
|
err(1, "clock_gettime");
|
|
}
|
|
|
|
static void
|
|
getfdtype(IO *io)
|
|
{
|
|
struct stat sb;
|
|
int type;
|
|
|
|
if (fstat(io->fd, &sb) == -1)
|
|
err(1, "%s", io->name);
|
|
if (S_ISREG(sb.st_mode))
|
|
io->flags |= ISTRUNC;
|
|
if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) {
|
|
if (ioctl(io->fd, FIODTYPE, &type) == -1) {
|
|
err(1, "%s", io->name);
|
|
} else {
|
|
if (type & D_TAPE)
|
|
io->flags |= ISTAPE;
|
|
else if (type & (D_DISK | D_MEM))
|
|
io->flags |= ISSEEK;
|
|
if (S_ISCHR(sb.st_mode) && (type & D_TAPE) == 0)
|
|
io->flags |= ISCHR;
|
|
}
|
|
return;
|
|
}
|
|
errno = 0;
|
|
if (lseek(io->fd, (off_t)0, SEEK_CUR) == -1 && errno == ESPIPE)
|
|
io->flags |= ISPIPE;
|
|
else
|
|
io->flags |= ISSEEK;
|
|
}
|
|
|
|
/*
|
|
* Limit the speed by adding a delay before every block read.
|
|
* The delay (t_usleep) is equal to the time computed from block
|
|
* size and the specified speed limit (t_target) minus the time
|
|
* spent on actual read and write operations (t_io).
|
|
*/
|
|
static void
|
|
speed_limit(void)
|
|
{
|
|
static double t_prev, t_usleep;
|
|
double t_now, t_io, t_target;
|
|
|
|
t_now = secs_elapsed();
|
|
t_io = t_now - t_prev - t_usleep;
|
|
t_target = (double)in.dbsz / (double)speed;
|
|
t_usleep = t_target - t_io;
|
|
if (t_usleep > 0)
|
|
usleep(t_usleep * 1000000);
|
|
else
|
|
t_usleep = 0;
|
|
t_prev = t_now;
|
|
}
|
|
|
|
static void
|
|
swapbytes(void *v, size_t len)
|
|
{
|
|
unsigned char *p = v;
|
|
unsigned char t;
|
|
|
|
while (len > 1) {
|
|
t = p[0];
|
|
p[0] = p[1];
|
|
p[1] = t;
|
|
p += 2;
|
|
len -= 2;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dd_in(void)
|
|
{
|
|
ssize_t n;
|
|
|
|
for (;;) {
|
|
switch (cpy_cnt) {
|
|
case -1: /* count=0 was specified */
|
|
return;
|
|
case 0:
|
|
break;
|
|
default:
|
|
if (st.in_full + st.in_part >= (uintmax_t)cpy_cnt)
|
|
return;
|
|
break;
|
|
}
|
|
|
|
if (speed > 0)
|
|
speed_limit();
|
|
|
|
/*
|
|
* Zero the buffer first if sync; if doing block operations,
|
|
* use spaces.
|
|
*/
|
|
if (ddflags & C_SYNC) {
|
|
if (ddflags & C_FILL)
|
|
memset(in.dbp, fill_char, in.dbsz);
|
|
else if (ddflags & (C_BLOCK | C_UNBLOCK))
|
|
memset(in.dbp, ' ', in.dbsz);
|
|
else
|
|
memset(in.dbp, 0, in.dbsz);
|
|
}
|
|
|
|
in.dbrcnt = 0;
|
|
fill:
|
|
n = read(in.fd, in.dbp + in.dbrcnt, in.dbsz - in.dbrcnt);
|
|
|
|
/* EOF */
|
|
if (n == 0 && in.dbrcnt == 0)
|
|
return;
|
|
|
|
/* Read error */
|
|
if (n == -1) {
|
|
/*
|
|
* If noerror not specified, die. POSIX requires that
|
|
* the warning message be followed by an I/O display.
|
|
*/
|
|
if (!(ddflags & C_NOERROR))
|
|
err(1, "%s", in.name);
|
|
warn("%s", in.name);
|
|
summary();
|
|
|
|
/*
|
|
* If it's a seekable file descriptor, seek past the
|
|
* error. If your OS doesn't do the right thing for
|
|
* raw disks this section should be modified to re-read
|
|
* in sector size chunks.
|
|
*/
|
|
if (in.flags & ISSEEK &&
|
|
lseek(in.fd, (off_t)in.dbsz, SEEK_CUR))
|
|
warn("%s", in.name);
|
|
|
|
/* If sync not specified, omit block and continue. */
|
|
if (!(ddflags & C_SYNC))
|
|
continue;
|
|
}
|
|
|
|
/* If conv=sync, use the entire block. */
|
|
if (ddflags & C_SYNC)
|
|
n = in.dbsz;
|
|
|
|
/* Count the bytes read for this block. */
|
|
in.dbrcnt += n;
|
|
|
|
/* Count the number of full and partial blocks. */
|
|
if (in.dbrcnt == in.dbsz)
|
|
++st.in_full;
|
|
else if (ddflags & C_IFULLBLOCK && n != 0)
|
|
goto fill; /* these don't count */
|
|
else
|
|
++st.in_part;
|
|
|
|
/* Count the total bytes read for this file. */
|
|
in.dbcnt += in.dbrcnt;
|
|
|
|
/*
|
|
* POSIX states that if bs is set and no other conversions
|
|
* than noerror, notrunc or sync are specified, the block
|
|
* is output without buffering as it is read.
|
|
*/
|
|
if ((ddflags & ~(C_NOERROR | C_NOTRUNC | C_SYNC)) == C_BS) {
|
|
out.dbcnt = in.dbcnt;
|
|
dd_out(1);
|
|
in.dbcnt = 0;
|
|
continue;
|
|
}
|
|
|
|
if (ddflags & C_SWAB) {
|
|
if ((n = in.dbrcnt) & 1) {
|
|
++st.swab;
|
|
--n;
|
|
}
|
|
swapbytes(in.dbp, (size_t)n);
|
|
}
|
|
|
|
/* Advance to the next block. */
|
|
in.dbp += in.dbrcnt;
|
|
(*cfunc)();
|
|
if (need_summary)
|
|
summary();
|
|
if (need_progress)
|
|
progress();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clean up any remaining I/O and flush output. If necessary, the output file
|
|
* is truncated.
|
|
*/
|
|
static void
|
|
dd_close(void)
|
|
{
|
|
if (cfunc == def)
|
|
def_close();
|
|
else if (cfunc == block)
|
|
block_close();
|
|
else if (cfunc == unblock)
|
|
unblock_close();
|
|
if (ddflags & C_OSYNC && out.dbcnt && out.dbcnt < out.dbsz) {
|
|
if (ddflags & C_FILL)
|
|
memset(out.dbp, fill_char, out.dbsz - out.dbcnt);
|
|
else if (ddflags & (C_BLOCK | C_UNBLOCK))
|
|
memset(out.dbp, ' ', out.dbsz - out.dbcnt);
|
|
else
|
|
memset(out.dbp, 0, out.dbsz - out.dbcnt);
|
|
out.dbcnt = out.dbsz;
|
|
}
|
|
if (out.dbcnt || pending)
|
|
dd_out(1);
|
|
|
|
/*
|
|
* If the file ends with a hole, ftruncate it to extend its size
|
|
* up to the end of the hole (without having to write any data).
|
|
*/
|
|
if (out.seek_offset > 0 && (out.flags & ISTRUNC)) {
|
|
if (ftruncate(out.fd, out.seek_offset) == -1)
|
|
err(1, "truncating %s", out.name);
|
|
}
|
|
|
|
if (ddflags & C_FSYNC) {
|
|
if (fsync(out.fd) == -1)
|
|
err(1, "fsyncing %s", out.name);
|
|
} else if (ddflags & C_FDATASYNC) {
|
|
if (fdatasync(out.fd) == -1)
|
|
err(1, "fdatasyncing %s", out.name);
|
|
}
|
|
}
|
|
|
|
void
|
|
dd_out(int force)
|
|
{
|
|
u_char *outp;
|
|
size_t cnt, n;
|
|
ssize_t nw;
|
|
static int warned;
|
|
int sparse;
|
|
|
|
/*
|
|
* Write one or more blocks out. The common case is writing a full
|
|
* output block in a single write; increment the full block stats.
|
|
* Otherwise, we're into partial block writes. If a partial write,
|
|
* and it's a character device, just warn. If a tape device, quit.
|
|
*
|
|
* The partial writes represent two cases. 1: Where the input block
|
|
* was less than expected so the output block was less than expected.
|
|
* 2: Where the input block was the right size but we were forced to
|
|
* write the block in multiple chunks. The original versions of dd(1)
|
|
* never wrote a block in more than a single write, so the latter case
|
|
* never happened.
|
|
*
|
|
* One special case is if we're forced to do the write -- in that case
|
|
* we play games with the buffer size, and it's usually a partial write.
|
|
*/
|
|
outp = out.db;
|
|
|
|
/*
|
|
* If force, first try to write all pending data, else try to write
|
|
* just one block. Subsequently always write data one full block at
|
|
* a time at most.
|
|
*/
|
|
for (n = force ? out.dbcnt : out.dbsz;; n = out.dbsz) {
|
|
cnt = n;
|
|
do {
|
|
sparse = 0;
|
|
if (ddflags & C_SPARSE) {
|
|
/* Is buffer sparse? */
|
|
sparse = BISZERO(outp, cnt);
|
|
}
|
|
if (sparse && !force) {
|
|
pending += cnt;
|
|
nw = cnt;
|
|
} else {
|
|
if (pending != 0) {
|
|
/*
|
|
* Seek past hole. Note that we need to record the
|
|
* reached offset, because we might have no more data
|
|
* to write, in which case we'll need to call
|
|
* ftruncate to extend the file size.
|
|
*/
|
|
out.seek_offset = lseek(out.fd, pending, SEEK_CUR);
|
|
if (out.seek_offset == -1)
|
|
err(2, "%s: seek error creating sparse file",
|
|
out.name);
|
|
pending = 0;
|
|
}
|
|
if (cnt) {
|
|
nw = write(out.fd, outp, cnt);
|
|
out.seek_offset = 0;
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (nw <= 0) {
|
|
if (nw == 0)
|
|
errx(1, "%s: end of device", out.name);
|
|
if (errno != EINTR)
|
|
err(1, "%s", out.name);
|
|
nw = 0;
|
|
}
|
|
|
|
outp += nw;
|
|
st.bytes += nw;
|
|
|
|
if ((size_t)nw == n && n == (size_t)out.dbsz)
|
|
++st.out_full;
|
|
else
|
|
++st.out_part;
|
|
|
|
if ((size_t) nw != cnt) {
|
|
if (out.flags & ISTAPE)
|
|
errx(1, "%s: short write on tape device",
|
|
out.name);
|
|
if (out.flags & ISCHR && !warned) {
|
|
warned = 1;
|
|
warnx("%s: short write on character device",
|
|
out.name);
|
|
}
|
|
}
|
|
|
|
cnt -= nw;
|
|
} while (cnt != 0);
|
|
|
|
if ((out.dbcnt -= n) < out.dbsz)
|
|
break;
|
|
}
|
|
|
|
/* Reassemble the output block. */
|
|
if (out.dbcnt)
|
|
(void)memmove(out.db, out.dbp - out.dbcnt, out.dbcnt);
|
|
out.dbp = out.db + out.dbcnt;
|
|
}
|