92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*-
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* Copyright (c) 2006,2008-2011 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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* 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libelf.h>
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#include "_libelf.h"
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ELFTC_VCSID("$Id: elf_begin.c 2364 2011-12-28 17:55:25Z jkoshy $");
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Elf *
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elf_begin(int fd, Elf_Cmd c, Elf *a)
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{
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Elf *e;
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e = NULL;
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if (LIBELF_PRIVATE(version) == EV_NONE) {
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LIBELF_SET_ERROR(SEQUENCE, 0);
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return (NULL);
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}
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switch (c) {
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case ELF_C_NULL:
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return (NULL);
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case ELF_C_WRITE:
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/*
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* The ELF_C_WRITE command is required to ignore the
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* descriptor passed in.
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*/
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a = NULL;
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break;
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case ELF_C_RDWR:
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if (a != NULL) { /* not allowed for ar(1) archives. */
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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/*FALLTHROUGH*/
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case ELF_C_READ:
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/*
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* Descriptor `a' could be for a regular ELF file, or
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* for an ar(1) archive. If descriptor `a' was opened
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* using a valid file descriptor, we need to check if
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* the passed in `fd' value matches the original one.
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*/
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if (a &&
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((a->e_fd != -1 && a->e_fd != fd) || c != a->e_cmd)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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break;
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default:
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (a == NULL)
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e = _libelf_open_object(fd, c, 1);
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else if (a->e_kind == ELF_K_AR)
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e = _libelf_ar_open_member(a->e_fd, c, a);
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else
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(e = a)->e_activations++;
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return (e);
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}
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