111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* read.c -- File views without mmap.
|
|
Copyright (C) 2012-2021 Free Software Foundation, Inc.
|
|
Written by Ian Lance Taylor, Google.
|
|
|
|
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) The name of the author may not be used to
|
|
endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "config.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "backtrace.h"
|
|
#include "internal.h"
|
|
|
|
/* This file implements file views when mmap is not available. */
|
|
|
|
/* Create a view of SIZE bytes from DESCRIPTOR at OFFSET. */
|
|
|
|
int
|
|
backtrace_get_view (struct backtrace_state *state, int descriptor,
|
|
off_t offset, uint64_t size,
|
|
backtrace_error_callback error_callback,
|
|
void *data, struct backtrace_view *view)
|
|
{
|
|
uint64_t got;
|
|
ssize_t r;
|
|
|
|
if ((uint64_t) (size_t) size != size)
|
|
{
|
|
error_callback (data, "file size too large", 0);
|
|
return 0;
|
|
}
|
|
|
|
if (lseek (descriptor, offset, SEEK_SET) < 0)
|
|
{
|
|
error_callback (data, "lseek", errno);
|
|
return 0;
|
|
}
|
|
|
|
view->base = backtrace_alloc (state, size, error_callback, data);
|
|
if (view->base == NULL)
|
|
return 0;
|
|
view->data = view->base;
|
|
view->len = size;
|
|
|
|
got = 0;
|
|
while (got < size)
|
|
{
|
|
r = read (descriptor, view->base, size - got);
|
|
if (r < 0)
|
|
{
|
|
error_callback (data, "read", errno);
|
|
free (view->base);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
break;
|
|
got += (uint64_t) r;
|
|
}
|
|
|
|
if (got < size)
|
|
{
|
|
error_callback (data, "file too short", 0);
|
|
free (view->base);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Release a view read by backtrace_get_view. */
|
|
|
|
void
|
|
backtrace_release_view (struct backtrace_state *state,
|
|
struct backtrace_view *view,
|
|
backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
backtrace_free (state, view->base, view->len, error_callback, data);
|
|
view->data = NULL;
|
|
view->base = NULL;
|
|
}
|