/* opncls.c -- open and close a BFD. Copyright (C) 1990-1991 Free Software Foundation, Inc. Written by Cygnus Support. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. $Id: opncls.c,v 1.1 1995/10/18 08:39:53 deraadt Exp $ */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "obstack.h" extern void bfd_cache_init PARAMS ((bfd *)); FILE *bfd_open_file PARAMS ((bfd *)); /* fdopen is a loser -- we should use stdio exclusively. Unfortunately if we do that we can't use fcntl. */ #define obstack_chunk_alloc bfd_xmalloc_by_size_t #define obstack_chunk_free free /* Return a new BFD. All BFD's are allocated through this routine. */ bfd * new_bfd PARAMS ((void)) { bfd *nbfd; nbfd = (bfd *)zalloc (sizeof (bfd)); if (!nbfd) return 0; bfd_check_init(); obstack_begin((PTR)&nbfd->memory, 128); nbfd->arch_info = &bfd_default_arch_struct; nbfd->direction = no_direction; nbfd->iostream = NULL; nbfd->where = 0; nbfd->sections = (asection *)NULL; nbfd->format = bfd_unknown; nbfd->my_archive = (bfd *)NULL; nbfd->origin = 0; nbfd->opened_once = false; nbfd->output_has_begun = false; nbfd->section_count = 0; nbfd->usrdata = (PTR)NULL; nbfd->cacheable = false; nbfd->flags = NO_FLAGS; nbfd->mtime_set = false; return nbfd; } /* Allocate a new BFD as a member of archive OBFD. */ bfd * new_bfd_contained_in (obfd) bfd *obfd; { bfd *nbfd; nbfd = new_bfd(); nbfd->xvec = obfd->xvec; nbfd->my_archive = obfd; nbfd->direction = read_direction; nbfd->target_defaulted = obfd->target_defaulted; return nbfd; } /* SECTION Opening and Closing BFDs */ /* FUNCTION bfd_openr SYNOPSIS bfd *bfd_openr(CONST char *filename, CONST char*target); DESCRIPTION This function opens the file supplied (using <>) with the target supplied, it returns a pointer to the created BFD. If NULL is returned then an error has occured. Possible errors are <>, <> or <> error. */ bfd * DEFUN(bfd_openr, (filename, target), CONST char *filename AND CONST char *target) { bfd *nbfd; bfd_target *target_vec; nbfd = new_bfd(); if (nbfd == NULL) { bfd_error = no_memory; return NULL; } target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) { bfd_error = invalid_target; return NULL; } nbfd->filename = filename; nbfd->direction = read_direction; if (bfd_open_file (nbfd) == NULL) { bfd_error = system_call_error; /* File didn't exist, or some such */ bfd_release(nbfd,0); return NULL; } return nbfd; } /* Don't try to `optimize' this function: o - We lock using stack space so that interrupting the locking won't cause a storage leak. o - We open the file stream last, since we don't want to have to close it if anything goes wrong. Closing the stream means closing the file descriptor too, even though we didn't open it. */ /* FUNCTION bfd_fdopenr SYNOPSIS bfd *bfd_fdopenr(CONST char *filename, CONST char *target, int fd); DESCRIPTION bfd_fdopenr is to bfd_fopenr much like fdopen is to fopen. It opens a BFD on a file already described by the @var{fd} supplied. When the file is later bfd_closed, the file descriptor will be closed. If the caller desires that this file descriptor be cached by BFD (opened as needed, closed as needed to free descriptors for other opens), with the supplied @var{fd} used as an initial file descriptor (but subject to closure at any time), set bfd->cacheable nonzero in the returned BFD. The default is to assume no cacheing; the file descriptor will remain open until bfd_close, and will not be affected by BFD operations on other files. Possible errors are no_memory, invalid_target and system_call error. */ bfd * DEFUN(bfd_fdopenr,(filename, target, fd), CONST char *filename AND CONST char *target AND int fd) { bfd *nbfd; bfd_target *target_vec; int fdflags; bfd_error = system_call_error; #ifdef NO_FCNTL fdflags = O_RDWR; /* Assume full access */ #else fdflags = fcntl (fd, F_GETFL, NULL); #endif if (fdflags == -1) return NULL; nbfd = new_bfd(); if (nbfd == NULL) { bfd_error = no_memory; return NULL; } target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) { bfd_error = invalid_target; return NULL; } #if defined(VMS) || defined(__GO32__) nbfd->iostream = (char *)fopen(filename, FOPEN_RB); #else /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ switch (fdflags & (O_ACCMODE)) { case O_RDONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RB); break; case O_WRONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RUB); break; case O_RDWR: nbfd->iostream = (char *) fdopen (fd, FOPEN_RUB); break; default: abort (); } #endif if (nbfd->iostream == NULL) { (void) obstack_free (&nbfd->memory, (PTR)0); return NULL; } /* OK, put everything where it belongs */ nbfd->filename = filename; /* As a special case we allow a FD open for read/write to be written through, although doing so requires that we end the previous clause with a preposition. */ /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ switch (fdflags & (O_ACCMODE)) { case O_RDONLY: nbfd->direction = read_direction; break; case O_WRONLY: nbfd->direction = write_direction; break; case O_RDWR: nbfd->direction = both_direction; break; default: abort (); } bfd_cache_init (nbfd); return nbfd; } /** bfd_openw -- open for writing. Returns a pointer to a freshly-allocated BFD on success, or NULL. See comment by bfd_fdopenr before you try to modify this function. */ /* FUNCTION bfd_openw SYNOPSIS bfd *bfd_openw(CONST char *filename, CONST char *target); DESCRIPTION Creates a BFD, associated with file @var{filename}, using the file format @var{target}, and returns a pointer to it. Possible errors are system_call_error, no_memory, invalid_target. */ bfd * DEFUN(bfd_openw,(filename, target), CONST char *filename AND CONST char *target) { bfd *nbfd; bfd_target *target_vec; bfd_error = system_call_error; /* nbfd has to point to head of malloc'ed block so that bfd_close may reclaim it correctly. */ nbfd = new_bfd(); if (nbfd == NULL) { bfd_error = no_memory; return NULL; } target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) return NULL; nbfd->filename = filename; nbfd->direction = write_direction; if (bfd_open_file (nbfd) == NULL) { bfd_error = system_call_error; /* File not writeable, etc */ (void) obstack_free (&nbfd->memory, (PTR)0); return NULL; } return nbfd; } /* FUNCTION bfd_close SYNOPSIS boolean bfd_close(bfd *); DESCRIPTION This function closes a BFD. If the BFD was open for writing, then pending operations are completed and the file written out and closed. If the created file is executable, then <> is called to mark it as such. All memory attached to the BFD's obstacks is released. The file descriptor associated with the BFD is closed (even if it was passed in to BFD by bfd_fdopenr). RETURNS <> is returned if all is ok, otherwise <>. */ boolean DEFUN(bfd_close,(abfd), bfd *abfd) { boolean ret; if (!bfd_read_p(abfd)) if (BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)) != true) return false; if (BFD_SEND (abfd, _close_and_cleanup, (abfd)) != true) return false; ret = bfd_cache_close(abfd); /* If the file was open for writing and is now executable, make it so */ if (ret == true && abfd->direction == write_direction && abfd->flags & EXEC_P) { struct stat buf; stat(abfd->filename, &buf); #ifndef S_IXUSR #define S_IXUSR 0100 /* Execute by owner. */ #endif #ifndef S_IXGRP #define S_IXGRP 0010 /* Execute by group. */ #endif #ifndef S_IXOTH #define S_IXOTH 0001 /* Execute by others. */ #endif chmod(abfd->filename, 0777 & (buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH)); } (void) obstack_free (&abfd->memory, (PTR)0); (void) free(abfd); return ret; } /* FUNCTION bfd_close_all_done SYNOPSIS boolean bfd_close_all_done(bfd *); DESCRIPTION This function closes a BFD. It differs from <> since it does not complete any pending operations. This routine would be used if the application had just used BFD for swapping and didn't want to use any of the writing code. If the created file is executable, then <> is called to mark it as such. All memory attached to the BFD's obstacks is released. RETURNS <> is returned if all is ok, otherwise <>. */ boolean DEFUN(bfd_close_all_done,(abfd), bfd *abfd) { boolean ret; ret = bfd_cache_close(abfd); /* If the file was open for writing and is now executable, make it so */ if (ret == true && abfd->direction == write_direction && abfd->flags & EXEC_P) { struct stat buf; stat(abfd->filename, &buf); #ifndef S_IXUSR #define S_IXUSR 0100 /* Execute by owner. */ #endif #ifndef S_IXGRP #define S_IXGRP 0010 /* Execute by group. */ #endif #ifndef S_IXOTH #define S_IXOTH 0001 /* Execute by others. */ #endif chmod(abfd->filename, 0x777 &(buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH)); } (void) obstack_free (&abfd->memory, (PTR)0); (void) free(abfd); return ret; } /* FUNCTION bfd_alloc_size SYNOPSIS bfd_size_type bfd_alloc_size(bfd *abfd); DESCRIPTION Return the number of bytes in the obstacks connected to the supplied BFD. */ bfd_size_type DEFUN(bfd_alloc_size,(abfd), bfd *abfd) { struct _obstack_chunk *chunk = abfd->memory.chunk; size_t size = 0; while (chunk) { size += chunk->limit - &(chunk->contents[0]); chunk = chunk->prev; } return size; } /* FUNCTION bfd_create SYNOPSIS bfd *bfd_create(CONST char *filename, bfd *templ); DESCRIPTION This routine creates a new BFD in the manner of <>, but without opening a file. The new BFD takes the target from the target used by @var{template}. The format is always set to <>. */ bfd * DEFUN(bfd_create,(filename, templ), CONST char *filename AND bfd *templ) { bfd *nbfd = new_bfd(); if (nbfd == (bfd *)NULL) { bfd_error = no_memory; return (bfd *)NULL; } nbfd->filename = filename; if(templ) { nbfd->xvec = templ->xvec; } nbfd->direction = no_direction; bfd_set_format(nbfd, bfd_object); return nbfd; } /* INTERNAL_FUNCTION bfd_alloc_by_size_t SYNOPSIS PTR bfd_alloc_by_size_t(bfd *abfd, size_t wanted); DESCRIPTION This function allocates a block of memory in the obstack attatched to <> and returns a pointer to it. */ PTR DEFUN(bfd_alloc_by_size_t,(abfd, size), bfd *abfd AND size_t size) { PTR res = obstack_alloc(&(abfd->memory), size); return res; } DEFUN(void bfd_alloc_grow,(abfd, ptr, size), bfd *abfd AND PTR ptr AND size_t size) { (void) obstack_grow(&(abfd->memory), ptr, size); } DEFUN(PTR bfd_alloc_finish,(abfd), bfd *abfd) { return obstack_finish(&(abfd->memory)); } DEFUN(PTR bfd_alloc, (abfd, size), bfd *abfd AND size_t size) { return bfd_alloc_by_size_t(abfd, (size_t)size); } DEFUN(PTR bfd_zalloc,(abfd, size), bfd *abfd AND size_t size) { PTR res; res = bfd_alloc(abfd, size); memset(res, 0, (size_t)size); return res; } DEFUN(PTR bfd_realloc,(abfd, old, size), bfd *abfd AND PTR old AND size_t size) { PTR res = bfd_alloc(abfd, size); memcpy(res, old, (size_t)size); return res; }