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sys/compat/linuxkpi/common/src/linux_seq_file.c
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2016-2018, Matthew Macy <mmacy@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. | |||||
* | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/types.h> | |||||
#include <sys/systm.h> | |||||
#include <sys/param.h> | |||||
#include <sys/sbuf.h> | |||||
#include <sys/syslog.h> | |||||
#include <sys/vnode.h> | |||||
#include <linux/seq_file.h> | |||||
#include <linux/file.h> | |||||
#undef file | |||||
MALLOC_DEFINE(M_LSEQ, "seq_file", "seq_file"); | |||||
ssize_t | |||||
seq_read(struct linux_file *f, char *ubuf, size_t size, off_t *ppos) | |||||
{ | |||||
struct seq_file *m = f->private_data; | |||||
void *p; | |||||
int rc; | |||||
off_t pos = 0; | |||||
p = m->op->start(m, &pos); | |||||
rc = m->op->show(m, p); | |||||
if (rc) | |||||
return (rc); | |||||
return (size); | |||||
} | |||||
int | |||||
seq_write(struct seq_file *seq, const void *data, size_t len) | |||||
{ | |||||
return (sbuf_bcpy(seq->buf, data, len)); | |||||
} | |||||
/* | |||||
* This only needs to be a valid address for lkpi | |||||
* drivers it should never actually be called | |||||
*/ | |||||
off_t | |||||
seq_lseek(struct linux_file *file, off_t offset, int whence) | |||||
{ | |||||
panic("%s not supported\n", __FUNCTION__); | |||||
return (0); | |||||
} | |||||
static void * | |||||
single_start(struct seq_file *p, off_t *pos) | |||||
{ | |||||
return ((void *)(uintptr_t)(*pos == 0)); | |||||
} | |||||
static void * | |||||
single_next(struct seq_file *p, void *v, off_t *pos) | |||||
{ | |||||
++*pos; | |||||
return (NULL); | |||||
} | |||||
static void | |||||
single_stop(struct seq_file *p, void *v) | |||||
{ | |||||
} | |||||
int | |||||
seq_open(struct linux_file *f, const struct seq_operations *op) | |||||
{ | |||||
struct seq_file *p; | |||||
if (f->private_data != NULL) | |||||
log(LOG_WARNING, "%s private_data not NULL", __func__); | |||||
if ((p = malloc(sizeof(*p), M_LSEQ, M_NOWAIT|M_ZERO)) == NULL) | |||||
return (-ENOMEM); | |||||
f->private_data = p; | |||||
p->op = op; | |||||
p->file = f; | |||||
return (0); | |||||
} | |||||
int | |||||
single_open(struct linux_file *f, int (*show)(struct seq_file *, void *), void *d) | |||||
{ | |||||
struct seq_operations *op; | |||||
int rc = -ENOMEM; | |||||
op = malloc(sizeof(*op), M_LSEQ, M_NOWAIT); | |||||
if (op) { | |||||
op->start = single_start; | |||||
op->next = single_next; | |||||
op->stop = single_stop; | |||||
op->show = show; | |||||
rc = seq_open(f, op); | |||||
if (rc) | |||||
free(op, M_LSEQ); | |||||
else | |||||
((struct seq_file *)f->private_data)->private = d; | |||||
} | |||||
return (rc); | |||||
} | |||||
int | |||||
seq_release(struct inode *inode __unused, struct linux_file *file) | |||||
{ | |||||
struct seq_file *m; | |||||
m = file->private_data; | |||||
free(m, M_LSEQ); | |||||
return (0); | |||||
} | |||||
int | |||||
single_release(struct vnode *v, struct linux_file *f) | |||||
{ | |||||
const struct seq_operations *op = ((struct seq_file *)f->private_data)->op; | |||||
int rc; | |||||
rc = seq_release(v, f); | |||||
free(__DECONST(void *, op), M_LSEQ); | |||||
return (rc); | |||||
} |