533 lines
12 KiB
C
533 lines
12 KiB
C
/* opncls.c -- open and close a BFD.
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Copyright (C) 1990-1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "obstack.h"
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extern void bfd_cache_init PARAMS ((bfd *));
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FILE *bfd_open_file PARAMS ((bfd *));
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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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#define obstack_chunk_alloc bfd_xmalloc_by_size_t
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#define obstack_chunk_free free
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/* Return a new BFD. All BFD's are allocated through this routine. */
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bfd *new_bfd PARAMS ((void))
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{
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bfd *nbfd;
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nbfd = (bfd *)zalloc (sizeof (bfd));
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if (!nbfd)
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return 0;
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bfd_check_init();
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obstack_begin((PTR)&nbfd->memory, 128);
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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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nbfd->sections = (asection *)NULL;
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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->sections = (asection *)NULL;
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nbfd->cacheable = false;
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nbfd->flags = 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 *new_bfd_contained_in(obfd)
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bfd *obfd;
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{
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bfd *nbfd = new_bfd();
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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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/*
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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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This function opens the file supplied (using <<fopen>>) with the target
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supplied, it returns a pointer to the created BFD.
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If NULL is returned then an error has occured. Possible errors
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are <<no_memory>>, <<invalid_target>> or <<system_call>> error.
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*/
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bfd *
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DEFUN(bfd_openr, (filename, target),
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CONST char *filename AND
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CONST char *target)
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{
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bfd *nbfd;
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bfd_target *target_vec;
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nbfd = new_bfd();
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if (nbfd == NULL) {
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bfd_error = no_memory;
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return NULL;
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}
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL) {
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bfd_error = invalid_target;
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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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bfd_error = system_call_error; /* File didn't exist, or some such */
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bfd_release(nbfd,0);
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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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/*
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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_closed, 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), set
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bfd->cacheable nonzero in 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 no_memory, invalid_target and system_call
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error.
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*/
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bfd *
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DEFUN(bfd_fdopenr,(filename, target, fd),
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CONST char *filename AND
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CONST char *target AND
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int fd)
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{
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bfd *nbfd;
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bfd_target *target_vec;
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int fdflags;
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bfd_error = system_call_error;
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#ifdef NO_FCNTL
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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) return NULL;
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nbfd = new_bfd();
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if (nbfd == NULL) {
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bfd_error = no_memory;
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return NULL;
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}
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL) {
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bfd_error = invalid_target;
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return NULL;
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}
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#if defined(VMS) || defined(__GO32__)
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nbfd->iostream = (char *)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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case O_RDONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RB); break;
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case O_WRONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RUB); break;
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case O_RDWR: nbfd->iostream = (char *) 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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(void) obstack_free (&nbfd->memory, (PTR)0);
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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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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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bfd_cache_init (nbfd);
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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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Creates a BFD, associated with file @var{filename}, using the
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file format @var{target}, and returns a pointer to it.
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Possible errors are system_call_error, no_memory,
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invalid_target.
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*/
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bfd *
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DEFUN(bfd_openw,(filename, target),
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CONST char *filename AND
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CONST char *target)
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{
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bfd *nbfd;
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bfd_target *target_vec;
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bfd_error = system_call_error;
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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 = new_bfd();
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if (nbfd == NULL) {
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bfd_error = no_memory;
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return NULL;
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}
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target_vec = bfd_find_target (target, nbfd);
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if (target_vec == NULL) return NULL;
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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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bfd_error = system_call_error; /* File not writeable, etc */
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(void) obstack_free (&nbfd->memory, (PTR)0);
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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 *);
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DESCRIPTION
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This function closes 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's obstacks 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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DEFUN(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_read_p(abfd))
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if (BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)) != true)
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return false;
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if (BFD_SEND (abfd, _close_and_cleanup, (abfd)) != true) 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 == true
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&& abfd->direction == write_direction
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&& abfd->flags & EXEC_P) {
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struct stat buf;
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stat(abfd->filename, &buf);
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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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chmod(abfd->filename, 0777 & (buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH));
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}
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(void) obstack_free (&abfd->memory, (PTR)0);
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(void) free(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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This function closes a BFD. It 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's obstacks 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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DEFUN(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 == true
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&& abfd->direction == write_direction
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&& abfd->flags & EXEC_P) {
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struct stat buf;
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stat(abfd->filename, &buf);
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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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chmod(abfd->filename, 0x777 &(buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH));
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}
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(void) obstack_free (&abfd->memory, (PTR)0);
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(void) free(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_alloc_size
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SYNOPSIS
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bfd_size_type bfd_alloc_size(bfd *abfd);
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DESCRIPTION
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Return the number of bytes in the obstacks connected to the
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supplied BFD.
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*/
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bfd_size_type
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DEFUN(bfd_alloc_size,(abfd),
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bfd *abfd)
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{
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struct _obstack_chunk *chunk = abfd->memory.chunk;
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size_t size = 0;
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while (chunk) {
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size += chunk->limit - &(chunk->contents[0]);
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chunk = chunk->prev;
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}
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return size;
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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 *template);
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DESCRIPTION
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This routine creates 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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DEFUN(bfd_create,(filename, template),
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CONST char *filename AND
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bfd *template)
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{
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bfd *nbfd = new_bfd();
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if (nbfd == (bfd *)NULL) {
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bfd_error = no_memory;
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return (bfd *)NULL;
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}
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nbfd->filename = filename;
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if(template) {
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nbfd->xvec = template->xvec;
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}
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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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INTERNAL_FUNCTION
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bfd_alloc_by_size_t
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SYNOPSIS
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PTR bfd_alloc_by_size_t(bfd *abfd, size_t wanted);
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DESCRIPTION
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This function allocates a block of memory in the obstack
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attatched to <<abfd>> and returns a pointer to it.
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*/
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PTR
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DEFUN(bfd_alloc_by_size_t,(abfd, size),
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bfd *abfd AND
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size_t size)
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{
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PTR res = obstack_alloc(&(abfd->memory), size);
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return res;
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}
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DEFUN(void bfd_alloc_grow,(abfd, ptr, size),
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bfd *abfd AND
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PTR ptr AND
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size_t size)
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{
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(void) obstack_grow(&(abfd->memory), ptr, size);
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}
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DEFUN(PTR bfd_alloc_finish,(abfd),
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bfd *abfd)
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{
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return obstack_finish(&(abfd->memory));
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}
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DEFUN(PTR bfd_alloc, (abfd, size),
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bfd *abfd AND
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size_t size)
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{
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return bfd_alloc_by_size_t(abfd, (size_t)size);
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}
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DEFUN(PTR bfd_zalloc,(abfd, size),
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bfd *abfd AND
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size_t size)
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{
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PTR res;
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res = bfd_alloc(abfd, size);
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memset(res, 0, (size_t)size);
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return res;
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}
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DEFUN(PTR bfd_realloc,(abfd, old, size),
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bfd *abfd AND
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PTR old AND
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size_t size)
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{
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PTR res = bfd_alloc(abfd, size);
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memcpy(res, old, (size_t)size);
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return res;
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}
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