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- /* read.c -- File views without mmap.
- Copyright (C) 2012-2022 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;
- }
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