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https://github.com/freebsd/freebsd-src
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839529caa9
Some notable improvements include: readelf: - Add AArch64 relocation definitions. - Report value of unknown relocation types. elfcopy: - Consider symbols with STB_GNU_UNIQUE binding as global symbols. - Fixed support for VMA adjustment for loadable sections found in relocatable objects. - Handle nameless global symbols. - Improve wildcard matching for !-prefixed symbols. - Add PE/COFF support. elfdump: - Improve section type reporting. - Add MIPS-specific section types. This update also includes a significant number of bug fixes. PR: 207091 [exp-run] Sponsored by: The FreeBSD Foundation
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*-
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* Copyright (c) 2011, Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "libelftc.h"
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#include "_libelftc.h"
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#if ELFTC_HAVE_MMAP
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#include <sys/mman.h>
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#endif
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ELFTC_VCSID("$Id: elftc_copyfile.c 3297 2016-01-09 15:26:34Z jkoshy $");
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/*
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* Copy the contents referenced by 'ifd' to 'ofd'. Returns 0 on
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* success and -1 on error.
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*/
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int
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elftc_copyfile(int ifd, int ofd)
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{
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size_t file_size, n;
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int buf_mmapped;
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struct stat sb;
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char *b, *buf;
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ssize_t nr, nw;
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/* Determine the input file's size. */
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if (fstat(ifd, &sb) < 0)
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return (-1);
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/* Skip files without content. */
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if (sb.st_size == 0)
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return (0);
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buf = NULL;
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buf_mmapped = 0;
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file_size = (size_t) sb.st_size;
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#if ELFTC_HAVE_MMAP
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/*
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* Prefer mmap() if it is available.
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*/
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buf = mmap(NULL, file_size, PROT_READ, MAP_SHARED, ifd, (off_t) 0);
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if (buf != MAP_FAILED)
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buf_mmapped = 1;
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else
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buf = NULL;
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#endif
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/*
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* If mmap() is not available, or if the mmap() operation
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* failed, allocate a buffer, and read in input data.
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*/
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if (buf_mmapped == false) {
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if ((buf = malloc(file_size)) == NULL)
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return (-1);
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b = buf;
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for (n = file_size; n > 0; n -= (size_t) nr, b += nr) {
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if ((nr = read(ifd, b, n)) < 0) {
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free(buf);
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return (-1);
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}
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}
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}
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/*
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* Write data to the output file descriptor.
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*/
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for (n = file_size, b = buf; n > 0; n -= (size_t) nw, b += nw)
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if ((nw = write(ofd, b, n)) <= 0)
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break;
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/* Release the input buffer. */
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#if ELFTC_HAVE_MMAP
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if (buf_mmapped && munmap(buf, file_size) < 0)
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return (-1);
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#endif
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if (!buf_mmapped)
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free(buf);
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return (n > 0 ? -1 : 0);
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}
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