694 lines
15 KiB
C
694 lines
15 KiB
C
/* opncls.c -- open and close a BFD.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
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2001, 2002
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Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "objalloc.h"
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#include "libbfd.h"
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#ifndef S_IXUSR
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#define S_IXUSR 0100 /* Execute by owner. */
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#endif
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#ifndef S_IXGRP
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#define S_IXGRP 0010 /* Execute by group. */
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#endif
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#ifndef S_IXOTH
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#define S_IXOTH 0001 /* Execute by others. */
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#endif
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/* fdopen is a loser -- we should use stdio exclusively. Unfortunately
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if we do that we can't use fcntl. */
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/* Return a new BFD. All BFD's are allocated through this routine. */
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bfd *
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_bfd_new_bfd ()
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{
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bfd *nbfd;
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nbfd = (bfd *) bfd_zmalloc ((bfd_size_type) sizeof (bfd));
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if (nbfd == NULL)
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return NULL;
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nbfd->memory = (PTR) objalloc_create ();
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if (nbfd->memory == NULL)
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{
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bfd_set_error (bfd_error_no_memory);
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free (nbfd);
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return NULL;
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}
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nbfd->arch_info = &bfd_default_arch_struct;
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nbfd->direction = no_direction;
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nbfd->iostream = NULL;
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nbfd->where = 0;
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if (!bfd_hash_table_init (&nbfd->section_htab, bfd_section_hash_newfunc))
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{
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free (nbfd);
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return NULL;
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}
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nbfd->sections = (asection *) NULL;
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nbfd->section_tail = &nbfd->sections;
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nbfd->format = bfd_unknown;
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nbfd->my_archive = (bfd *) NULL;
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nbfd->origin = 0;
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nbfd->opened_once = false;
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nbfd->output_has_begun = false;
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nbfd->section_count = 0;
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nbfd->usrdata = (PTR) NULL;
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nbfd->cacheable = false;
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nbfd->flags = BFD_NO_FLAGS;
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nbfd->mtime_set = false;
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return nbfd;
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}
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/* Allocate a new BFD as a member of archive OBFD. */
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bfd *
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_bfd_new_bfd_contained_in (obfd)
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bfd *obfd;
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{
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bfd *nbfd;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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nbfd->xvec = obfd->xvec;
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nbfd->my_archive = obfd;
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nbfd->direction = read_direction;
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nbfd->target_defaulted = obfd->target_defaulted;
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return nbfd;
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}
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/* Delete a BFD. */
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void
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_bfd_delete_bfd (abfd)
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bfd *abfd;
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{
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bfd_hash_table_free (&abfd->section_htab);
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objalloc_free ((struct objalloc *) abfd->memory);
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free (abfd);
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}
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/*
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SECTION
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Opening and closing BFDs
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*/
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/*
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FUNCTION
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bfd_openr
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SYNOPSIS
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bfd *bfd_openr(const char *filename, const char *target);
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DESCRIPTION
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Open the file @var{filename} (using <<fopen>>) with the target
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@var{target}. Return a pointer to the created BFD.
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Calls <<bfd_find_target>>, so @var{target} is interpreted as by
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that function.
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If <<NULL>> is returned then an error has occured. Possible errors
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are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or <<system_call>> error.
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*/
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bfd *
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bfd_openr (filename, target)
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const char *filename;
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const char *target;
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{
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bfd *nbfd;
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const bfd_target *target_vec;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL)
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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nbfd->filename = filename;
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nbfd->direction = read_direction;
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if (bfd_open_file (nbfd) == NULL)
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{
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/* File didn't exist, or some such. */
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bfd_set_error (bfd_error_system_call);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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return nbfd;
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}
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/* Don't try to `optimize' this function:
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o - We lock using stack space so that interrupting the locking
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won't cause a storage leak.
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o - We open the file stream last, since we don't want to have to
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close it if anything goes wrong. Closing the stream means closing
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the file descriptor too, even though we didn't open it. */
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/*
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FUNCTION
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bfd_fdopenr
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SYNOPSIS
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bfd *bfd_fdopenr(const char *filename, const char *target, int fd);
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DESCRIPTION
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<<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to <<fopen>>.
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It opens a BFD on a file already described by the @var{fd}
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supplied.
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When the file is later <<bfd_close>>d, the file descriptor will be closed.
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If the caller desires that this file descriptor be cached by BFD
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(opened as needed, closed as needed to free descriptors for
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other opens), with the supplied @var{fd} used as an initial
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file descriptor (but subject to closure at any time), call
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bfd_set_cacheable(bfd, 1) on the returned BFD. The default is to
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assume no cacheing; the file descriptor will remain open until
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<<bfd_close>>, and will not be affected by BFD operations on other
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files.
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Possible errors are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
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*/
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bfd *
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bfd_fdopenr (filename, target, fd)
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const char *filename;
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const char *target;
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int fd;
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{
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bfd *nbfd;
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const bfd_target *target_vec;
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int fdflags;
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bfd_set_error (bfd_error_system_call);
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#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
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fdflags = O_RDWR; /* Assume full access. */
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#else
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fdflags = fcntl (fd, F_GETFL, NULL);
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#endif
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if (fdflags == -1)
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return NULL;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL)
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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#ifndef HAVE_FDOPEN
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nbfd->iostream = (PTR) fopen (filename, FOPEN_RB);
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#else
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/* (O_ACCMODE) parens are to avoid Ultrix header file bug. */
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switch (fdflags & (O_ACCMODE))
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{
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case O_RDONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RB); break;
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case O_WRONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB); break;
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case O_RDWR: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB); break;
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default: abort ();
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}
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#endif
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if (nbfd->iostream == NULL)
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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/* OK, put everything where it belongs. */
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nbfd->filename = filename;
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/* As a special case we allow a FD open for read/write to
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be written through, although doing so requires that we end
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the previous clause with a preposition. */
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/* (O_ACCMODE) parens are to avoid Ultrix header file bug. */
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switch (fdflags & (O_ACCMODE))
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{
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case O_RDONLY: nbfd->direction = read_direction; break;
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case O_WRONLY: nbfd->direction = write_direction; break;
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case O_RDWR: nbfd->direction = both_direction; break;
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default: abort ();
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}
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if (! bfd_cache_init (nbfd))
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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nbfd->opened_once = true;
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return nbfd;
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}
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/*
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FUNCTION
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bfd_openstreamr
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SYNOPSIS
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bfd *bfd_openstreamr(const char *, const char *, PTR);
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DESCRIPTION
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Open a BFD for read access on an existing stdio stream. When
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the BFD is passed to <<bfd_close>>, the stream will be closed.
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*/
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bfd *
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bfd_openstreamr (filename, target, streamarg)
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const char *filename;
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const char *target;
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PTR streamarg;
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{
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FILE *stream = (FILE *) streamarg;
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bfd *nbfd;
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const bfd_target *target_vec;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL)
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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nbfd->iostream = (PTR) stream;
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nbfd->filename = filename;
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nbfd->direction = read_direction;
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if (! bfd_cache_init (nbfd))
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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return nbfd;
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}
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/* bfd_openw -- open for writing.
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Returns a pointer to a freshly-allocated BFD on success, or NULL.
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See comment by bfd_fdopenr before you try to modify this function. */
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/*
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FUNCTION
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bfd_openw
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SYNOPSIS
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bfd *bfd_openw(const char *filename, const char *target);
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DESCRIPTION
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Create a BFD, associated with file @var{filename}, using the
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file format @var{target}, and return a pointer to it.
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Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
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<<bfd_error_invalid_target>>.
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*/
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bfd *
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bfd_openw (filename, target)
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const char *filename;
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const char *target;
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{
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bfd *nbfd;
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const bfd_target *target_vec;
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/* nbfd has to point to head of malloc'ed block so that bfd_close may
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reclaim it correctly. */
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL)
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{
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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nbfd->filename = filename;
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nbfd->direction = write_direction;
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if (bfd_open_file (nbfd) == NULL)
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{
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/* File not writeable, etc. */
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bfd_set_error (bfd_error_system_call);
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_bfd_delete_bfd (nbfd);
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return NULL;
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}
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return nbfd;
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}
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/*
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FUNCTION
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bfd_close
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SYNOPSIS
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boolean bfd_close(bfd *abfd);
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DESCRIPTION
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Close a BFD. If the BFD was open for writing,
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then pending operations are completed and the file written out
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and closed. If the created file is executable, then
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<<chmod>> is called to mark it as such.
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All memory attached to the BFD is released.
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The file descriptor associated with the BFD is closed (even
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if it was passed in to BFD by <<bfd_fdopenr>>).
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RETURNS
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<<true>> is returned if all is ok, otherwise <<false>>.
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*/
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boolean
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bfd_close (abfd)
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bfd *abfd;
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{
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boolean ret;
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if (bfd_write_p (abfd))
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{
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if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
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return false;
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}
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if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
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return false;
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ret = bfd_cache_close (abfd);
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/* If the file was open for writing and is now executable,
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make it so. */
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if (ret
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&& abfd->direction == write_direction
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&& abfd->flags & EXEC_P)
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{
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struct stat buf;
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if (stat (abfd->filename, &buf) == 0)
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{
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unsigned int mask = umask (0);
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umask (mask);
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chmod (abfd->filename,
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(0777
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& (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
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}
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}
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_bfd_delete_bfd (abfd);
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return ret;
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}
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/*
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FUNCTION
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bfd_close_all_done
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SYNOPSIS
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boolean bfd_close_all_done(bfd *);
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DESCRIPTION
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Close a BFD. Differs from <<bfd_close>>
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since it does not complete any pending operations. This
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routine would be used if the application had just used BFD for
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swapping and didn't want to use any of the writing code.
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If the created file is executable, then <<chmod>> is called
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to mark it as such.
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All memory attached to the BFD is released.
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RETURNS
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<<true>> is returned if all is ok, otherwise <<false>>.
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*/
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boolean
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bfd_close_all_done (abfd)
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bfd *abfd;
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{
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boolean ret;
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ret = bfd_cache_close (abfd);
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/* If the file was open for writing and is now executable,
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make it so. */
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if (ret
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&& abfd->direction == write_direction
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&& abfd->flags & EXEC_P)
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{
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struct stat buf;
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if (stat (abfd->filename, &buf) == 0)
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{
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unsigned int mask = umask (0);
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umask (mask);
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chmod (abfd->filename,
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(0777
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& (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
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}
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}
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_bfd_delete_bfd (abfd);
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return ret;
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}
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/*
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FUNCTION
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bfd_create
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SYNOPSIS
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bfd *bfd_create(const char *filename, bfd *templ);
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DESCRIPTION
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Create a new BFD in the manner of
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<<bfd_openw>>, but without opening a file. The new BFD
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takes the target from the target used by @var{template}. The
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format is always set to <<bfd_object>>.
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*/
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bfd *
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bfd_create (filename, templ)
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const char *filename;
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bfd *templ;
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{
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bfd *nbfd;
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nbfd = _bfd_new_bfd ();
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if (nbfd == NULL)
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return NULL;
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nbfd->filename = filename;
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if (templ)
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nbfd->xvec = templ->xvec;
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nbfd->direction = no_direction;
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bfd_set_format (nbfd, bfd_object);
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return nbfd;
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}
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/*
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FUNCTION
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bfd_make_writable
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SYNOPSIS
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boolean bfd_make_writable(bfd *abfd);
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DESCRIPTION
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Takes a BFD as created by <<bfd_create>> and converts it
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into one like as returned by <<bfd_openw>>. It does this
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by converting the BFD to BFD_IN_MEMORY. It's assumed that
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you will call <<bfd_make_readable>> on this bfd later.
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RETURNS
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<<true>> is returned if all is ok, otherwise <<false>>.
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*/
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boolean
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bfd_make_writable(abfd)
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bfd *abfd;
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{
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struct bfd_in_memory *bim;
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if (abfd->direction != no_direction)
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{
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bfd_set_error (bfd_error_invalid_operation);
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return false;
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}
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bim = ((struct bfd_in_memory *)
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bfd_malloc ((bfd_size_type) sizeof (struct bfd_in_memory)));
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abfd->iostream = (PTR) bim;
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/* bfd_bwrite will grow these as needed. */
|
||
bim->size = 0;
|
||
bim->buffer = 0;
|
||
|
||
abfd->flags |= BFD_IN_MEMORY;
|
||
abfd->direction = write_direction;
|
||
abfd->where = 0;
|
||
|
||
return true;
|
||
}
|
||
|
||
/*
|
||
FUNCTION
|
||
bfd_make_readable
|
||
|
||
SYNOPSIS
|
||
boolean bfd_make_readable(bfd *abfd);
|
||
|
||
DESCRIPTION
|
||
Takes a BFD as created by <<bfd_create>> and
|
||
<<bfd_make_writable>> and converts it into one like as
|
||
returned by <<bfd_openr>>. It does this by writing the
|
||
contents out to the memory buffer, then reversing the
|
||
direction.
|
||
|
||
RETURNS
|
||
<<true>> is returned if all is ok, otherwise <<false>>. */
|
||
|
||
boolean
|
||
bfd_make_readable(abfd)
|
||
bfd *abfd;
|
||
{
|
||
if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return false;
|
||
}
|
||
|
||
if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
|
||
return false;
|
||
|
||
if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
|
||
return false;
|
||
|
||
|
||
abfd->arch_info = &bfd_default_arch_struct;
|
||
|
||
abfd->where = 0;
|
||
abfd->format = bfd_unknown;
|
||
abfd->my_archive = (bfd *) NULL;
|
||
abfd->origin = 0;
|
||
abfd->opened_once = false;
|
||
abfd->output_has_begun = false;
|
||
abfd->section_count = 0;
|
||
abfd->usrdata = (PTR) NULL;
|
||
abfd->cacheable = false;
|
||
abfd->flags = BFD_IN_MEMORY;
|
||
abfd->mtime_set = false;
|
||
|
||
abfd->target_defaulted = true;
|
||
abfd->direction = read_direction;
|
||
abfd->sections = 0;
|
||
abfd->symcount = 0;
|
||
abfd->outsymbols = 0;
|
||
abfd->tdata.any = 0;
|
||
|
||
bfd_section_list_clear (abfd);
|
||
bfd_check_format (abfd, bfd_object);
|
||
|
||
return true;
|
||
}
|
||
|
||
/*
|
||
INTERNAL_FUNCTION
|
||
bfd_alloc
|
||
|
||
SYNOPSIS
|
||
PTR bfd_alloc (bfd *abfd, size_t wanted);
|
||
|
||
DESCRIPTION
|
||
Allocate a block of @var{wanted} bytes of memory attached to
|
||
<<abfd>> and return a pointer to it.
|
||
*/
|
||
|
||
|
||
PTR
|
||
bfd_alloc (abfd, size)
|
||
bfd *abfd;
|
||
bfd_size_type size;
|
||
{
|
||
PTR ret;
|
||
|
||
if (size != (unsigned long) size)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return NULL;
|
||
}
|
||
|
||
ret = objalloc_alloc (abfd->memory, (unsigned long) size);
|
||
if (ret == NULL)
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return ret;
|
||
}
|
||
|
||
PTR
|
||
bfd_zalloc (abfd, size)
|
||
bfd *abfd;
|
||
bfd_size_type size;
|
||
{
|
||
PTR res;
|
||
|
||
res = bfd_alloc (abfd, size);
|
||
if (res)
|
||
memset (res, 0, (size_t) size);
|
||
return res;
|
||
}
|
||
|
||
/* Free a block allocated for a BFD.
|
||
Note: Also frees all more recently allocated blocks! */
|
||
|
||
void
|
||
bfd_release (abfd, block)
|
||
bfd *abfd;
|
||
PTR block;
|
||
{
|
||
objalloc_free_block ((struct objalloc *) abfd->memory, block);
|
||
}
|