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Index: share/man/man5/core.5
===================================================================
--- share/man/man5/core.5
+++ share/man/man5/core.5
@@ -28,7 +28,7 @@
.\" @(#)core.5 8.3 (Berkeley) 12/11/93
.\" $FreeBSD$
.\"
-.Dd November 22, 2012
+.Dd November 10, 2014
.Dt CORE 5
.Os
.Sh NAME
@@ -101,25 +101,23 @@
.Va kern.sugid_coredump
to 1.
.Pp
-Corefiles can be compressed by the kernel if the following items
-are included in the kernel configuration file:
+Corefiles can be compressed by the kernel if the following item
+is included in the kernel configuration file:
.Bl -tag -width "1234567890" -compact -offset "12345"
.It options
-COMPRESS_USER_CORES
-.It devices
-gzio
+GZIO
.El
.Pp
-When COMPRESS_USER_CORES is included the following sysctls can control
-if core files will be compressed:
+When the GZIO option is included, the following sysctls control whether core
+files will be compressed:
.Bl -tag -width "kern.compress_user_cores_gzlevel" -compact -offset "12345"
.It Em kern.compress_user_cores_gzlevel
Gzip compression level.
-Defaults to -1.
+Defaults to 6.
.It Em kern.compress_user_cores
Actually compress user cores.
-Core files will have the suffix
-.Em .gz
+Compressed core files will have a suffix of
+.Ql .gz
appended to them.
.El
.Sh EXAMPLES
Index: share/man/man9/Makefile
===================================================================
--- share/man/man9/Makefile
+++ share/man/man9/Makefile
@@ -130,6 +130,7 @@
g_provider_by_name.9 \
groupmember.9 \
g_wither_geom.9 \
+ gzio.9 \
hash.9 \
hashinit.9 \
hexdump.9 \
@@ -736,6 +737,10 @@
MLINKS+=g_provider.9 g_destroy_provider.9 \
g_provider.9 g_error_provider.9 \
g_provider.9 g_new_providerf.9
+MLINKS+=gzio.9 gzio_init.9 \
+ gzio.9 gzio_write.9 \
+ gzio.9 gzio_flush.9 \
+ gzio.9 gzio_fini.9
MLINKS+=hash.9 hash32.9 \
hash.9 hash32_buf.9 \
hash.9 hash32_str.9 \
Index: share/man/man9/gzio.9
===================================================================
--- /dev/null
+++ share/man/man9/gzio.9
@@ -0,0 +1,118 @@
+.\" Copyright (c) 2015 Mark Johnston <markj@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd February 14, 2015
+.Dt GZIO 9
+.Os
+.Sh NAME
+.Nm gzio
+.Nd a callback interface for the zlib compression library
+.Sh SYNOPSIS
+.Cd "options GZIO"
+.Pp
+.In sys/gzio.h
+.Bd -literal
+typedef int (*gzio_cb)(void *base, size_t len, off_t off, void *arg);
+.Ed
+.Pp
+.Ft struct gzio_stream *
+.Fn gzio_init "gzio_cb cb" "enum gzio_mode mode" "size_t bufsz" "int level" "void *arg"
+.Ft int
+.Fn gzio_write "struct gzio_stream *s" "void *data" "u_int len"
+.Ft int
+.Fn gzio_flush "struct gzio_stream *s"
+.Ft void
+.Fn gzio_fini "struct gzio_stream *s"
+.Sh DESCRIPTION
+The
+.Nm
+interface is a simple wrapper for the zlib library.
+It currently only supports compression of a data stream.
+A
+.Ft struct gzio_stream
+stores state for the stream and is allocated and freed using
+.Fn gzio_init
+and
+.Fn gzio_fini
+respectively.
+As data is written to the stream using
+.Fn gzio_write ,
+the caller-provided callback is invoked, making the processed data available.
+The callback is only invoked when the stream's internal buffer is full; to
+force the processing of partially-buffered data, use
+.Fn gzio_flush .
+.Fn gzio_fini
+is used to free a flushed stream.
+.Pp
+The
+.Fn gzio_init
+function allocates a new stream with callback
+.Va cb ,
+and an internal buffer of size
+.Va bufsz .
+The
+.Va mode
+parameter must be
+.Dv GZIO_DEFLATE .
+The
+.Va level
+parameter is a zlib parameter which determines the compression level used;
+valid values are 0-9 inclusive, and -1, which tells zlib to use its default
+compression level.
+Larger values give better compression ratios at the cost of CPU time and
+memory usage.
+Note that all memory used by
+.Nm
+is allocated in
+.Fn gzio_init .
+In particular, memory will not be allocated while writing to a
+.Nm
+stream.
+Finally,
+.Va arg
+is an opaque argument that is passed to
+.Va cb .
+.Fn gzio_init
+will return
+.Dv NULL
+if an error occurs during stream initialization.
+.Pp
+The
+.Fn gzio_write
+and
+.Fn gzio_flush
+functions write data to be compressed to a
+.Dv GZIO_DEFLATE
+stream.
+If the callback returns a non-zero value, these functions will return it to
+the caller.
+If an error occurs during compression,
+.Dv EIO will be returned.
+.Fn gzio_flush
+should be called exactly once for a given stream.
+.Sh SEE ALSO
+.Xr zlib 3 ,
+.Xr core 5
Index: sys/conf/NOTES
===================================================================
--- sys/conf/NOTES
+++ sys/conf/NOTES
@@ -2889,11 +2889,6 @@
# a single process at one time.
options SHMSEG=9
-# Compress user core dumps.
-options COMPRESS_USER_CORES
-# required to compress file output from kernel for COMPRESS_USER_CORES.
-device gzio
-
# Set the amount of time (in seconds) the system will wait before
# rebooting automatically when a kernel panic occurs. If set to (-1),
# the system will wait indefinitely until a key is pressed on the
@@ -2983,3 +2978,7 @@
# Module to enable execution of application via emulators like QEMU
options IMAGACT_BINMISC
+
+# zlib I/O stream support
+# This enables support for compressed core dumps.
+options GZIO
Index: sys/conf/options
===================================================================
--- sys/conf/options
+++ sys/conf/options
@@ -87,13 +87,13 @@
COMPAT_FREEBSD10 opt_compat.h
COMPAT_LINUXAPI opt_compat.h
COMPILING_LINT opt_global.h
-COMPRESS_USER_CORES opt_core.h
CY_PCI_FASTINTR
DEADLKRES opt_watchdog.h
DIRECTIO
FILEMON opt_dontuse.h
FFCLOCK
FULL_PREEMPTION opt_sched.h
+GZIO opt_gzio.h
IMAGACT_BINMISC opt_dontuse.h
IPI_PREEMPTION opt_sched.h
GEOM_AES opt_geom.h
Index: sys/kern/imgact_elf.c
===================================================================
--- sys/kern/imgact_elf.c
+++ sys/kern/imgact_elf.c
@@ -33,12 +33,13 @@
#include "opt_capsicum.h"
#include "opt_compat.h"
-#include "opt_core.h"
+#include "opt_gzio.h"
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/exec.h>
#include <sys/fcntl.h>
+#include <sys/gzio.h>
#include <sys/imgact.h>
#include <sys/imgact_elf.h>
#include <sys/kernel.h>
@@ -68,8 +69,6 @@
#include <sys/eventhandler.h>
#include <sys/user.h>
-#include <net/zlib.h>
-
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_param.h>
@@ -104,11 +103,7 @@
SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
"");
-#ifdef COMPRESS_USER_CORES
-static int compress_core(gzFile, char *, char *, unsigned int,
- struct thread * td);
-#endif
-#define CORE_BUF_SIZE (16 * 1024)
+#define CORE_BUF_SIZE (16 * 1024)
int __elfN(fallback_brand) = -1;
SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
@@ -1065,11 +1060,21 @@
TAILQ_HEAD(note_info_list, note_info);
+/* Coredump output parameters. */
+struct coredump_params {
+ off_t offset;
+ struct ucred *active_cred;
+ struct ucred *file_cred;
+ struct thread *td;
+ struct vnode *vp;
+ struct gzio_stream *gzs;
+};
+
static void cb_put_phdr(vm_map_entry_t, void *);
static void cb_size_segment(vm_map_entry_t, void *);
static void each_writable_segment(struct thread *, segment_callback, void *);
-static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
- int, void *, size_t, struct note_info_list *, size_t, gzFile);
+static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
+ struct note_info_list *, size_t);
static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
size_t *);
static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
@@ -1093,42 +1098,58 @@
static void note_procstat_umask(void *, struct sbuf *, size_t *);
static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
-#ifdef COMPRESS_USER_CORES
+#ifdef GZIO
extern int compress_user_cores;
extern int compress_user_cores_gzlevel;
-#endif
+/*
+ * Compress and write out a core segment for a user process.
+ */
static int
-core_output(struct vnode *vp, void *base, size_t len, off_t offset,
- struct ucred *active_cred, struct ucred *file_cred,
- struct thread *td, char *core_buf, gzFile gzfile) {
-
+compress_chunk(char *base, char *buf, u_int len, struct coredump_params *p)
+{
+ u_int chunk_len;
int error;
- if (gzfile) {
-#ifdef COMPRESS_USER_CORES
- error = compress_core(gzfile, base, core_buf, len, td);
-#else
- panic("shouldn't be here");
-#endif
- } else {
- error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset,
- UIO_USERSPACE, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
- active_cred, file_cred, NULL, td);
+
+ while (len > 0) {
+ chunk_len = MIN(len, CORE_BUF_SIZE);
+ copyin(base, buf, chunk_len);
+ error = gzio_write(p->gzs, buf, chunk_len);
+ if (error != 0)
+ break;
+ base += chunk_len;
+ len -= chunk_len;
}
return (error);
}
+#endif /* GZIO */
-/* Coredump output parameters for sbuf drain routine. */
-struct sbuf_drain_core_params {
- off_t offset;
- struct ucred *active_cred;
- struct ucred *file_cred;
- struct thread *td;
- struct vnode *vp;
-#ifdef COMPRESS_USER_CORES
- gzFile gzfile;
+static int
+core_write(void *base, size_t len, off_t offset, void *arg)
+{
+ struct coredump_params *p;
+
+ p = (struct coredump_params *)arg;
+
+ return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset,
+ UIO_SYSSPACE, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
+ p->active_cred, p->file_cred, NULL, p->td));
+}
+
+static int
+core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
+ void *tmpbuf)
+{
+ int error;
+
+#ifdef GZIO
+ if (p->gzs != NULL)
+ error = compress_chunk(base, tmpbuf, len, p);
+ else
#endif
-};
+ error = core_write(base, len, offset, p);
+ return (error);
+}
/*
* Drain into a core file.
@@ -1136,10 +1157,10 @@
static int
sbuf_drain_core_output(void *arg, const char *data, int len)
{
- struct sbuf_drain_core_params *p;
+ struct coredump_params *p;
int error, locked;
- p = (struct sbuf_drain_core_params *)arg;
+ p = (struct coredump_params *)arg;
/*
* Some kern_proc out routines that print to this sbuf may
@@ -1152,16 +1173,12 @@
locked = PROC_LOCKED(p->td->td_proc);
if (locked)
PROC_UNLOCK(p->td->td_proc);
-#ifdef COMPRESS_USER_CORES
- if (p->gzfile != Z_NULL)
- error = compress_core(p->gzfile, NULL, __DECONST(char *, data),
- len, p->td);
+#ifdef GZIO
+ if (p->gzs != NULL)
+ error = gzio_write(p->gzs, __DECONST(char *, data), len);
else
#endif
- error = vn_rdwr_inchunks(UIO_WRITE, p->vp,
- __DECONST(void *, data), len, p->offset, UIO_SYSSPACE,
- IO_UNIT | IO_DIRECT | IO_RANGELOCKED, p->active_cred,
- p->file_cred, NULL, p->td);
+ error = core_write(__DECONST(void *, data), len, p->offset, p);
if (locked)
PROC_LOCK(p->td->td_proc);
if (error != 0)
@@ -1190,42 +1207,16 @@
int error = 0;
struct sseg_closure seginfo;
struct note_info_list notelst;
+ struct coredump_params params;
struct note_info *ninfo;
- void *hdr;
+ void *hdr, *tmpbuf;
size_t hdrsize, notesz, coresize;
+ boolean_t compress;
- gzFile gzfile = Z_NULL;
- char *core_buf = NULL;
-#ifdef COMPRESS_USER_CORES
- char gzopen_flags[8];
- char *p;
- int doing_compress = flags & IMGACT_CORE_COMPRESS;
-#endif
-
+ compress = (flags & IMGACT_CORE_COMPRESS) != 0;
hdr = NULL;
TAILQ_INIT(&notelst);
-#ifdef COMPRESS_USER_CORES
- if (doing_compress) {
- p = gzopen_flags;
- *p++ = 'w';
- if (compress_user_cores_gzlevel >= 0 &&
- compress_user_cores_gzlevel <= 9)
- *p++ = '0' + compress_user_cores_gzlevel;
- *p = 0;
- gzfile = gz_open("", gzopen_flags, vp);
- if (gzfile == Z_NULL) {
- error = EFAULT;
- goto done;
- }
- core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
- if (!core_buf) {
- error = ENOMEM;
- goto done;
- }
- }
-#endif
-
/* Size the program segments. */
seginfo.count = 0;
seginfo.size = 0;
@@ -1252,6 +1243,28 @@
goto done;
}
+ /* Set up core dump parameters. */
+ params.offset = 0;
+ params.active_cred = cred;
+ params.file_cred = NOCRED;
+ params.td = td;
+ params.vp = vp;
+ params.gzs = NULL;
+
+ tmpbuf = NULL;
+#ifdef GZIO
+ /* Create a compression stream if necessary. */
+ if (compress) {
+ params.gzs = gzio_init(core_write, GZIO_DEFLATE, CORE_BUF_SIZE,
+ compress_user_cores_gzlevel, &params);
+ if (params.gzs == NULL) {
+ error = EFAULT;
+ goto done;
+ }
+ tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
+ }
+#endif
+
/*
* Allocate memory for building the header, fill it up,
* and write it out following the notes.
@@ -1261,8 +1274,8 @@
error = EINVAL;
goto done;
}
- error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize,
- &notelst, notesz, gzfile);
+ error = __elfN(corehdr)(&params, seginfo.count, hdr, hdrsize, &notelst,
+ notesz);
/* Write the contents of all of the writable segments. */
if (error == 0) {
@@ -1273,13 +1286,17 @@
php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
offset = round_page(hdrsize + notesz);
for (i = 0; i < seginfo.count; i++) {
- error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr,
- php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile);
+ error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
+ php->p_filesz, offset, &params, tmpbuf);
if (error != 0)
break;
offset += php->p_filesz;
php++;
}
+#ifdef GZIO
+ if (error == 0 && compress)
+ error = gzio_flush(params.gzs);
+#endif
}
if (error) {
log(LOG_WARNING,
@@ -1288,11 +1305,11 @@
}
done:
-#ifdef COMPRESS_USER_CORES
- if (core_buf)
- free(core_buf, M_TEMP);
- if (gzfile)
- gzclose(gzfile);
+#ifdef GZIO
+ if (compress) {
+ free(tmpbuf, M_TEMP);
+ gzio_fini(params.gzs);
+ }
#endif
while ((ninfo = TAILQ_FIRST(&notelst)) != NULL) {
TAILQ_REMOVE(&notelst, ninfo, link);
@@ -1416,29 +1433,19 @@
* the page boundary.
*/
static int
-__elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred,
- int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst,
- size_t notesz, gzFile gzfile)
+__elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
+ size_t hdrsize, struct note_info_list *notelst, size_t notesz)
{
- struct sbuf_drain_core_params params;
struct note_info *ninfo;
struct sbuf *sb;
int error;
/* Fill in the header. */
bzero(hdr, hdrsize);
- __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz);
+ __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
- params.offset = 0;
- params.active_cred = cred;
- params.file_cred = NOCRED;
- params.td = td;
- params.vp = vp;
-#ifdef COMPRESS_USER_CORES
- params.gzfile = gzfile;
-#endif
sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
- sbuf_set_drain(sb, sbuf_drain_core_output, &params);
+ sbuf_set_drain(sb, sbuf_drain_core_output, p);
sbuf_start_section(sb, NULL);
sbuf_bcat(sb, hdr, hdrsize);
TAILQ_FOREACH(ninfo, notelst, link)
@@ -2105,58 +2112,6 @@
};
EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
-#ifdef COMPRESS_USER_CORES
-/*
- * Compress and write out a core segment for a user process.
- *
- * 'inbuf' is the starting address of a VM segment in the process' address
- * space that is to be compressed and written out to the core file. 'dest_buf'
- * is a buffer in the kernel's address space. The segment is copied from
- * 'inbuf' to 'dest_buf' first before being processed by the compression
- * routine gzwrite(). This copying is necessary because the content of the VM
- * segment may change between the compression pass and the crc-computation pass
- * in gzwrite(). This is because realtime threads may preempt the UNIX kernel.
- *
- * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'.
- */
-static int
-compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len,
- struct thread *td)
-{
- int len_compressed;
- int error = 0;
- unsigned int chunk_len;
-
- while (len) {
- if (inbuf != NULL) {
- chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len;
- copyin(inbuf, dest_buf, chunk_len);
- inbuf += chunk_len;
- } else {
- chunk_len = len;
- }
- len_compressed = gzwrite(file, dest_buf, chunk_len);
-
- EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
-
- if ((unsigned int)len_compressed != chunk_len) {
- log(LOG_WARNING,
- "compress_core: length mismatch (0x%x returned, "
- "0x%x expected)\n", len_compressed, chunk_len);
- EVENTHANDLER_INVOKE(app_coredump_error, td,
- "compress_core: length mismatch %x -> %x",
- chunk_len, len_compressed);
- error = EFAULT;
- break;
- }
- len -= chunk_len;
- maybe_yield();
- }
-
- return (error);
-}
-#endif /* COMPRESS_USER_CORES */
-
static vm_prot_t
__elfN(trans_prot)(Elf_Word flags)
{
Index: sys/kern/kern_gzio.c
===================================================================
--- sys/kern/kern_gzio.c
+++ sys/kern/kern_gzio.c
@@ -1,400 +1,223 @@
-/*
- * $Id: kern_gzio.c,v 1.6 2008-10-18 22:54:45 lbazinet Exp $
+/*-
+ * Copyright (c) 2014 Mark Johnston <markj@FreeBSD.org>
*
- * core_gzip.c -- gzip routines used in compressing user process cores
+ * 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.
*
- * This file is derived from src/lib/libz/gzio.c in FreeBSD.
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
-/* gzio.c -- IO on .gz files
- * Copyright (C) 1995-1998 Jean-loup Gailly.
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- */
-
-/* @(#) $FreeBSD$ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
#include <sys/param.h>
-#include <sys/proc.h>
+
+#include <sys/gzio.h>
+#include <sys/kernel.h>
#include <sys/malloc.h>
-#include <sys/vnode.h>
-#include <sys/syslog.h>
-#include <sys/endian.h>
-#include <net/zutil.h>
-#include <sys/libkern.h>
-
-#include <sys/vnode.h>
-#include <sys/mount.h>
-
-#define GZ_HEADER_LEN 10
-
-#ifndef Z_BUFSIZE
-# ifdef MAXSEG_64K
-# define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */
-# else
-# define Z_BUFSIZE 16384
-# endif
-#endif
-#ifndef Z_PRINTF_BUFSIZE
-# define Z_PRINTF_BUFSIZE 4096
-#endif
-
-#define ALLOC(size) malloc(size, M_TEMP, M_WAITOK | M_ZERO)
-#define TRYFREE(p) {if (p) free(p, M_TEMP);}
-
-static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
-
-/* gzip flag byte */
-#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
-#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
-#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
-#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
-#define COMMENT 0x10 /* bit 4 set: file comment present */
-#define RESERVED 0xE0 /* bits 5..7: reserved */
-
-typedef struct gz_stream {
- z_stream stream;
- int z_err; /* error code for last stream operation */
- int z_eof; /* set if end of input file */
- struct vnode *file; /* vnode pointer of .gz file */
- Byte *inbuf; /* input buffer */
- Byte *outbuf; /* output buffer */
- uLong crc; /* crc32 of uncompressed data */
- char *msg; /* error message */
- char *path; /* path name for debugging only */
- int transparent; /* 1 if input file is not a .gz file */
- char mode; /* 'w' or 'r' */
- long startpos; /* start of compressed data in file (header skipped) */
- off_t outoff; /* current offset in output file */
- int flags;
-} gz_stream;
-
-
-local int do_flush OF((gzFile file, int flush));
-local int destroy OF((gz_stream *s));
-local void putU32 OF((gz_stream *file, uint32_t x));
-local void *gz_alloc OF((void *notused, u_int items, u_int size));
-local void gz_free OF((void *notused, void *ptr));
-
-/* ===========================================================================
- Opens a gzip (.gz) file for reading or writing. The mode parameter
- is as in fopen ("rb" or "wb"). The file is given either by file descriptor
- or path name (if fd == -1).
- gz_open return NULL if the file could not be opened or if there was
- insufficient memory to allocate the (de)compression state; errno
- can be checked to distinguish the two cases (if errno is zero, the
- zlib error is Z_MEM_ERROR).
-*/
-gzFile gz_open (path, mode, vp)
- const char *path;
- const char *mode;
- struct vnode *vp;
-{
- int err;
- int level = Z_DEFAULT_COMPRESSION; /* compression level */
- int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
- const char *p = mode;
- gz_stream *s;
- char fmode[80]; /* copy of mode, without the compression level */
- char *m = fmode;
- ssize_t resid;
- int error;
- char buf[GZ_HEADER_LEN + 1];
-
- if (!path || !mode) return Z_NULL;
-
- s = (gz_stream *)ALLOC(sizeof(gz_stream));
- if (!s) return Z_NULL;
-
- s->stream.zalloc = (alloc_func)gz_alloc;
- s->stream.zfree = (free_func)gz_free;
- s->stream.opaque = (voidpf)0;
- s->stream.next_in = s->inbuf = Z_NULL;
- s->stream.next_out = s->outbuf = Z_NULL;
- s->stream.avail_in = s->stream.avail_out = 0;
- s->file = NULL;
- s->z_err = Z_OK;
- s->z_eof = 0;
- s->crc = 0;
- s->msg = NULL;
- s->transparent = 0;
- s->outoff = 0;
- s->flags = 0;
-
- s->path = (char*)ALLOC(strlen(path)+1);
- if (s->path == NULL) {
- return destroy(s), (gzFile)Z_NULL;
- }
- strcpy(s->path, path); /* do this early for debugging */
-
- s->mode = '\0';
- do {
- if (*p == 'r') s->mode = 'r';
- if (*p == 'w' || *p == 'a') s->mode = 'w';
- if (*p >= '0' && *p <= '9') {
- level = *p - '0';
- } else if (*p == 'f') {
- strategy = Z_FILTERED;
- } else if (*p == 'h') {
- strategy = Z_HUFFMAN_ONLY;
- } else {
- *m++ = *p; /* copy the mode */
- }
- } while (*p++ && m != fmode + sizeof(fmode));
-
- if (s->mode != 'w') {
- log(LOG_ERR, "gz_open: mode is not w (%c)\n", s->mode);
- return destroy(s), (gzFile)Z_NULL;
- }
-
- err = deflateInit2(&(s->stream), level,
- Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
- /* windowBits is passed < 0 to suppress zlib header */
-
- s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
- if (err != Z_OK || s->outbuf == Z_NULL) {
- return destroy(s), (gzFile)Z_NULL;
- }
-
- s->stream.avail_out = Z_BUFSIZE;
- s->file = vp;
-
- /* Write a very simple .gz header:
- */
- snprintf(buf, sizeof(buf), "%c%c%c%c%c%c%c%c%c%c", gz_magic[0],
- gz_magic[1], Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/,
- 0 /*xflags*/, OS_CODE);
-
- if ((error = vn_rdwr(UIO_WRITE, s->file, buf, GZ_HEADER_LEN, s->outoff,
- UIO_SYSSPACE, IO_UNIT, curproc->p_ucred,
- NOCRED, &resid, curthread))) {
- s->outoff += GZ_HEADER_LEN - resid;
- return destroy(s), (gzFile)Z_NULL;
- }
- s->outoff += GZ_HEADER_LEN;
- s->startpos = 10L;
-
- return (gzFile)s;
-}
+#include <net/zutil.h>
- /* ===========================================================================
- * Cleanup then free the given gz_stream. Return a zlib error code.
- Try freeing in the reverse order of allocations.
- */
-local int destroy (s)
- gz_stream *s;
+#define KERN_GZ_HDRLEN 10 /* gzip header length */
+#define KERN_GZ_TRAILERLEN 8 /* gzip trailer length */
+#define KERN_GZ_MAGIC1 0x1f /* first magic byte */
+#define KERN_GZ_MAGIC2 0x8b /* second magic byte */
+
+MALLOC_DEFINE(M_GZIO, "gzio", "zlib state");
+
+struct gzio_stream {
+ uint8_t * gz_buffer; /* output buffer */
+ size_t gz_bufsz; /* total buffer size */
+ off_t gz_off; /* offset into the output stream */
+ enum gzio_mode gz_mode; /* stream mode */
+ uint32_t gz_crc; /* stream CRC32 */
+ gzio_cb gz_cb; /* output callback */
+ void * gz_arg; /* private callback arg */
+ z_stream gz_stream; /* zlib state */
+};
+
+static void * gz_alloc(void *, u_int, u_int);
+static void gz_free(void *, void *);
+static int gz_write(struct gzio_stream *, void *, u_int, int);
+
+struct gzio_stream *
+gzio_init(gzio_cb cb, enum gzio_mode mode, size_t bufsz, int level, void *arg)
{
- int err = Z_OK;
-
- if (!s) return Z_STREAM_ERROR;
-
- TRYFREE(s->msg);
-
- if (s->stream.state != NULL) {
- if (s->mode == 'w') {
- err = deflateEnd(&(s->stream));
- }
- }
- if (s->z_err < 0) err = s->z_err;
-
- TRYFREE(s->inbuf);
- TRYFREE(s->outbuf);
- TRYFREE(s->path);
- TRYFREE(s);
- return err;
+ struct gzio_stream *s;
+ uint8_t *hdr;
+ int error;
+
+ if (bufsz < KERN_GZ_HDRLEN)
+ return (NULL);
+ if (mode != GZIO_DEFLATE)
+ return (NULL);
+
+ s = gz_alloc(NULL, 1, sizeof(*s));
+ s->gz_bufsz = bufsz;
+ s->gz_buffer = gz_alloc(NULL, 1, s->gz_bufsz);
+ s->gz_mode = mode;
+ s->gz_crc = ~0U;
+ s->gz_cb = cb;
+ s->gz_arg = arg;
+
+ s->gz_stream.zalloc = gz_alloc;
+ s->gz_stream.zfree = gz_free;
+ s->gz_stream.opaque = NULL;
+ s->gz_stream.next_in = Z_NULL;
+ s->gz_stream.avail_in = 0;
+
+ error = deflateInit2(&s->gz_stream, level, Z_DEFLATED, -MAX_WBITS,
+ DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+ if (error != 0)
+ goto fail;
+
+ s->gz_stream.avail_out = s->gz_bufsz;
+ s->gz_stream.next_out = s->gz_buffer;
+
+ /* Write the gzip header to the output buffer. */
+ hdr = s->gz_buffer;
+ memset(hdr, 0, KERN_GZ_HDRLEN);
+ hdr[0] = KERN_GZ_MAGIC1;
+ hdr[1] = KERN_GZ_MAGIC2;
+ hdr[2] = Z_DEFLATED;
+ hdr[9] = OS_CODE;
+ s->gz_stream.next_out += KERN_GZ_HDRLEN;
+ s->gz_stream.avail_out -= KERN_GZ_HDRLEN;
+
+ return (s);
+
+fail:
+ gz_free(NULL, s->gz_buffer);
+ gz_free(NULL, s);
+ return (NULL);
}
-
-/* ===========================================================================
- Writes the given number of uncompressed bytes into the compressed file.
- gzwrite returns the number of bytes actually written (0 in case of error).
-*/
-int ZEXPORT gzwrite (file, buf, len)
- gzFile file;
- const voidp buf;
- unsigned len;
+int
+gzio_write(struct gzio_stream *s, void *data, u_int len)
{
- gz_stream *s = (gz_stream*)file;
- off_t curoff;
- size_t resid;
- int error;
-
- if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
-
- s->stream.next_in = (Bytef*)buf;
- s->stream.avail_in = len;
-
- curoff = s->outoff;
- while (s->stream.avail_in != 0) {
-
- if (s->stream.avail_out == 0) {
-
- s->stream.next_out = s->outbuf;
- error = vn_rdwr_inchunks(UIO_WRITE, s->file, s->outbuf, Z_BUFSIZE,
- curoff, UIO_SYSSPACE, IO_UNIT,
- curproc->p_ucred, NOCRED, &resid, curthread);
- if (error) {
- log(LOG_ERR, "gzwrite: vn_rdwr return %d\n", error);
- curoff += Z_BUFSIZE - resid;
- s->z_err = Z_ERRNO;
- break;
- }
- curoff += Z_BUFSIZE;
- s->stream.avail_out = Z_BUFSIZE;
- }
- s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
- if (s->z_err != Z_OK) {
- log(LOG_ERR,
- "gzwrite: deflate returned error %d\n", s->z_err);
- break;
- }
- }
-
- s->crc = ~crc32_raw(buf, len, ~s->crc);
- s->outoff = curoff;
-
- return (int)(len - s->stream.avail_in);
-}
-
-/* ===========================================================================
- Flushes all pending output into the compressed file. The parameter
- flush is as in the deflate() function.
-*/
-local int do_flush (file, flush)
- gzFile file;
- int flush;
-{
- uInt len;
- int done = 0;
- gz_stream *s = (gz_stream*)file;
- off_t curoff = s->outoff;
- size_t resid;
- int error;
-
- if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
-
- if (s->stream.avail_in) {
- log(LOG_WARNING, "do_flush: avail_in non-zero on entry\n");
- }
-
- s->stream.avail_in = 0; /* should be zero already anyway */
-
- for (;;) {
- len = Z_BUFSIZE - s->stream.avail_out;
-
- if (len != 0) {
- error = vn_rdwr_inchunks(UIO_WRITE, s->file, s->outbuf, len, curoff,
- UIO_SYSSPACE, IO_UNIT, curproc->p_ucred,
- NOCRED, &resid, curthread);
- if (error) {
- s->z_err = Z_ERRNO;
- s->outoff = curoff + len - resid;
- return Z_ERRNO;
- }
- s->stream.next_out = s->outbuf;
- s->stream.avail_out = Z_BUFSIZE;
- curoff += len;
- }
- if (done) break;
- s->z_err = deflate(&(s->stream), flush);
-
- /* Ignore the second of two consecutive flushes: */
- if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
-
- /* deflate has finished flushing only when it hasn't used up
- * all the available space in the output buffer:
- */
- done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
-
- if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
- }
- s->outoff = curoff;
-
- return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
+ return (gz_write(s, data, len, Z_NO_FLUSH));
}
-int ZEXPORT gzflush (file, flush)
- gzFile file;
- int flush;
+int
+gzio_flush(struct gzio_stream *s)
{
- gz_stream *s = (gz_stream*)file;
- int err = do_flush (file, flush);
- if (err) return err;
- return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
+ return (gz_write(s, NULL, 0, Z_FINISH));
}
-
-/* ===========================================================================
- Outputs a long in LSB order to the given file
-*/
-local void putU32 (s, x)
- gz_stream *s;
- uint32_t x;
+void
+gzio_fini(struct gzio_stream *s)
{
- uint32_t xx;
- off_t curoff = s->outoff;
- ssize_t resid;
-
-#if BYTE_ORDER == BIG_ENDIAN
- xx = bswap32(x);
-#else
- xx = x;
-#endif
- vn_rdwr(UIO_WRITE, s->file, (caddr_t)&xx, sizeof(xx), curoff,
- UIO_SYSSPACE, IO_UNIT, curproc->p_ucred,
- NOCRED, &resid, curthread);
- s->outoff += sizeof(xx) - resid;
-}
-
-/* ===========================================================================
- Flushes all pending output if necessary, closes the compressed file
- and deallocates all the (de)compression state.
-*/
-int ZEXPORT gzclose (file)
- gzFile file;
-{
- int err;
- gz_stream *s = (gz_stream*)file;
-
- if (s == NULL) return Z_STREAM_ERROR;
-
- if (s->mode == 'w') {
- err = do_flush (file, Z_FINISH);
- if (err != Z_OK) {
- log(LOG_ERR, "gzclose: do_flush failed (err %d)\n", err);
- return destroy((gz_stream*)file);
- }
-#if 0
- printf("gzclose: putting crc: %lld total: %lld\n",
- (long long)s->crc, (long long)s->stream.total_in);
- printf("sizeof uLong = %d\n", (int)sizeof(uLong));
-#endif
- putU32 (s, s->crc);
- putU32 (s, (uint32_t) s->stream.total_in);
- }
- return destroy((gz_stream*)file);
+ (void)deflateEnd(&s->gz_stream);
+ gz_free(NULL, s->gz_buffer);
+ gz_free(NULL, s);
}
-/*
- * Space allocation and freeing routines for use by zlib routines when called
- * from gzip modules.
- */
static void *
-gz_alloc(void *notused __unused, u_int items, u_int size)
+gz_alloc(void *arg __unused, u_int n, u_int sz)
{
- void *ptr;
- MALLOC(ptr, void *, items * size, M_TEMP, M_NOWAIT | M_ZERO);
- return ptr;
+ /*
+ * Memory for zlib state is allocated using M_NODUMP since it may be
+ * used to compress a kernel dump, and we don't want zlib to attempt to
+ * compress its own state.
+ */
+ return (malloc(n * sz, M_GZIO, M_WAITOK | M_ZERO | M_NODUMP));
}
-
+
static void
-gz_free(void *opaque __unused, void *ptr)
+gz_free(void *arg __unused, void *ptr)
{
- FREE(ptr, M_TEMP);
+
+ free(ptr, M_GZIO);
}
+static int
+gz_write(struct gzio_stream *s, void *buf, u_int len, int zflag)
+{
+ uint8_t trailer[KERN_GZ_TRAILERLEN];
+ size_t room;
+ int error, zerror;
+
+ KASSERT(zflag == Z_FINISH || zflag == Z_NO_FLUSH,
+ ("unexpected flag %d", zflag));
+ KASSERT(s->gz_mode == GZIO_DEFLATE,
+ ("invalid stream mode %d", s->gz_mode));
+
+ if (len > 0) {
+ s->gz_stream.avail_in = len;
+ s->gz_stream.next_in = buf;
+ s->gz_crc = crc32_raw(buf, len, s->gz_crc);
+ } else
+ s->gz_crc ^= ~0U;
+
+ error = 0;
+ do {
+ zerror = deflate(&s->gz_stream, zflag);
+ if (zerror != Z_OK && zerror != Z_STREAM_END) {
+ error = EIO;
+ break;
+ }
+
+ if (s->gz_stream.avail_out == 0 || zerror == Z_STREAM_END) {
+ /*
+ * Our output buffer is full or there's nothing left
+ * to produce, so we're flushing the buffer.
+ */
+ len = s->gz_bufsz - s->gz_stream.avail_out;
+ if (zerror == Z_STREAM_END) {
+ /*
+ * Try to pack as much of the trailer into the
+ * output buffer as we can.
+ */
+ ((uint32_t *)trailer)[0] = s->gz_crc;
+ ((uint32_t *)trailer)[1] =
+ s->gz_stream.total_in;
+ room = MIN(KERN_GZ_TRAILERLEN,
+ s->gz_bufsz - len);
+ memcpy(s->gz_buffer + len, trailer, room);
+ len += room;
+ }
+
+ error = s->gz_cb(s->gz_buffer, len, s->gz_off,
+ s->gz_arg);
+ if (error != 0)
+ break;
+
+ s->gz_off += len;
+ s->gz_stream.next_out = s->gz_buffer;
+ s->gz_stream.avail_out = s->gz_bufsz;
+
+ /*
+ * If we couldn't pack the trailer into the output
+ * buffer, write it out now.
+ */
+ if (zerror == Z_STREAM_END && room < KERN_GZ_TRAILERLEN)
+ error = s->gz_cb(trailer + room,
+ KERN_GZ_TRAILERLEN - room, s->gz_off,
+ s->gz_arg);
+ }
+ } while (zerror != Z_STREAM_END &&
+ (zflag == Z_FINISH || s->gz_stream.avail_in > 0));
+
+ return (error);
+}
Index: sys/kern/kern_sig.c
===================================================================
--- sys/kern/kern_sig.c
+++ sys/kern/kern_sig.c
@@ -38,8 +38,8 @@
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
+#include "opt_gzio.h"
#include "opt_ktrace.h"
-#include "opt_core.h"
#include <sys/param.h>
#include <sys/ctype.h>
@@ -3075,18 +3075,17 @@
SYSCTL_PROC(_debug, OID_AUTO, ncores, CTLTYPE_INT|CTLFLAG_RW,
0, sizeof(int), sysctl_debug_num_cores_check, "I", "");
-#if defined(COMPRESS_USER_CORES)
+#ifdef GZIO
int compress_user_cores = 1;
SYSCTL_INT(_kern, OID_AUTO, compress_user_cores, CTLFLAG_RW,
&compress_user_cores, 0, "Compression of user corefiles");
-int compress_user_cores_gzlevel = -1; /* default level */
+int compress_user_cores_gzlevel = 6;
SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_gzlevel, CTLFLAG_RW,
- &compress_user_cores_gzlevel, -1, "Corefile gzip compression level");
+ &compress_user_cores_gzlevel, 0, "Corefile gzip compression level");
-#define GZ_SUFFIX ".gz"
-#define GZ_SUFFIX_LEN 3
-#endif
+#define GZ_SUFFIX ".gz"
+#endif /* GZIO */
static char corefilename[MAXPATHLEN] = {"%N.core"};
SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RWTUN, corefilename,
@@ -3162,7 +3161,7 @@
}
}
free(hostname, M_TEMP);
-#ifdef COMPRESS_USER_CORES
+#ifdef GZIO
if (compress)
sbuf_printf(&sb, GZ_SUFFIX);
#endif
@@ -3267,7 +3266,7 @@
static const char comm_name[] = "comm=";
static const char core_name[] = "core=";
-#ifdef COMPRESS_USER_CORES
+#ifdef GZIO
compress = compress_user_cores;
#else
compress = 0;
Index: sys/net/zlib.h
===================================================================
--- sys/net/zlib.h
+++ sys/net/zlib.h
@@ -1010,13 +1010,6 @@
uLongf *get_crc_table OF((void)); /* can be used by asm versions of crc32() */
-#ifdef _KERNEL
-struct vnode;
-extern gzFile gz_open OF((const char *path, const char *mode,
- struct vnode *vp));
-#endif
-
-
#ifdef __cplusplus
}
#endif
Index: sys/sys/gzio.h
===================================================================
--- /dev/null
+++ sys/sys/gzio.h
@@ -0,0 +1,49 @@
+/*-
+ * Copyright (c) 2014 Mark Johnston <markj@FreeBSD.org>
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS__GZIO_H_
+#define _SYS__GZIO_H_
+
+#ifdef _KERNEL
+
+enum gzio_mode {
+ GZIO_DEFLATE,
+};
+
+typedef int (*gzio_cb)(void *, size_t, off_t, void *);
+
+struct gzio_stream;
+
+struct gzio_stream *gzio_init(gzio_cb cb, enum gzio_mode, size_t, int, void *);
+int gzio_write(struct gzio_stream *, void *, u_int);
+int gzio_flush(struct gzio_stream *);
+void gzio_fini(struct gzio_stream *);
+
+#endif /* _KERNEL */
+
+#endif /* _SYS__GZIO_H_ */

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