/* opncls.c -- open and close a BFD. Copyright (C) 1990 91, 92, 93, 94, 95, 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "obstack.h" #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 /* fdopen is a loser -- we should use stdio exclusively. Unfortunately if we do that we can't use fcntl. */ #define obstack_chunk_alloc malloc #define obstack_chunk_free free #ifndef HAVE_GETPAGESIZE #define getpagesize() 2048 #endif long _bfd_chunksize = -1; /* Return a new BFD. All BFD's are allocated through this routine. */ bfd * _bfd_new_bfd () { bfd *nbfd; nbfd = (bfd *)bfd_zmalloc (sizeof (bfd)); if (!nbfd) return 0; if (_bfd_chunksize <= 0) { _bfd_chunksize = getpagesize (); if (_bfd_chunksize <= 0) _bfd_chunksize = 2048; /* Leave some slush space, since many malloc implementations prepend a header, and may wind up wasting another page because of it. */ _bfd_chunksize -= 32; } if (!obstack_begin(&nbfd->memory, _bfd_chunksize)) { bfd_set_error (bfd_error_no_memory); return 0; } 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 = BFD_NO_FLAGS; nbfd->mtime_set = false; return nbfd; } /* Allocate a new BFD as a member of archive OBFD. */ bfd * _bfd_new_bfd_contained_in (obfd) bfd *obfd; { bfd *nbfd; nbfd = _bfd_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 Open the file @var{filename} (using <>) with the target @var{target}. Return a pointer to the created BFD. Calls <>, so @var{target} is interpreted as by that function. If <> is returned then an error has occured. Possible errors are <>, <> or <> error. */ bfd * bfd_openr (filename, target) CONST char *filename; CONST char *target; { bfd *nbfd; const bfd_target *target_vec; nbfd = _bfd_new_bfd(); if (nbfd == NULL) return NULL; target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) { bfd_set_error (bfd_error_invalid_target); return NULL; } nbfd->filename = filename; nbfd->direction = read_direction; if (bfd_open_file (nbfd) == NULL) { bfd_set_error (bfd_error_system_call); /* 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 <> is to <> much like <> is to <>. It opens a BFD on a file already described by the @var{fd} supplied. When the file is later <>d, 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), call bfd_set_cacheable(bfd, 1) on the returned BFD. The default is to assume no cacheing; the file descriptor will remain open until <>, and will not be affected by BFD operations on other files. Possible errors are <>, <> and <>. */ bfd * bfd_fdopenr (filename, target, fd) CONST char *filename; CONST char *target; int fd; { bfd *nbfd; const bfd_target *target_vec; int fdflags; bfd_set_error (bfd_error_system_call); #if ! defined(HAVE_FCNTL) || ! defined(F_GETFL) fdflags = O_RDWR; /* Assume full access */ #else fdflags = fcntl (fd, F_GETFL, NULL); #endif if (fdflags == -1) return NULL; nbfd = _bfd_new_bfd(); if (nbfd == NULL) return NULL; target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) { bfd_set_error (bfd_error_invalid_target); return NULL; } #if defined(VMS) || defined(__GO32__) nbfd->iostream = (PTR)fopen(filename, FOPEN_RB); #else /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ switch (fdflags & (O_ACCMODE)) { case O_RDONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RB); break; case O_WRONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB); break; case O_RDWR: nbfd->iostream = (PTR) 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 (); } if (! bfd_cache_init (nbfd)) return NULL; nbfd->opened_once = true; return nbfd; } /* FUNCTION bfd_openstreamr SYNOPSIS bfd *bfd_openstreamr(); DESCRIPTION Open a BFD for read access on an existing stdio stream. When the BFD is passed to <>, the stream will be closed. */ bfd * bfd_openstreamr (filename, target, stream) const char *filename; const char *target; FILE *stream; { bfd *nbfd; const bfd_target *target_vec; nbfd = _bfd_new_bfd (); if (nbfd == NULL) return NULL; target_vec = bfd_find_target (target, nbfd); if (target_vec == NULL) { bfd_set_error (bfd_error_invalid_target); return NULL; } nbfd->iostream = (PTR) stream; nbfd->filename = filename; nbfd->direction = read_direction; if (! bfd_cache_init (nbfd)) return NULL; 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 Create a BFD, associated with file @var{filename}, using the file format @var{target}, and return a pointer to it. Possible errors are <>, <>, <>. */ bfd * bfd_openw (filename, target) CONST char *filename; CONST char *target; { bfd *nbfd; const bfd_target *target_vec; bfd_set_error (bfd_error_system_call); /* nbfd has to point to head of malloc'ed block so that bfd_close may reclaim it correctly. */ nbfd = _bfd_new_bfd(); if (nbfd == NULL) 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_set_error (bfd_error_system_call); /* File not writeable, etc */ (void) obstack_free (&nbfd->memory, (PTR)0); return NULL; } return nbfd; } /* FUNCTION bfd_close SYNOPSIS boolean bfd_close(bfd *abfd); DESCRIPTION Close 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 <>). RETURNS <> is returned if all is ok, otherwise <>. */ boolean bfd_close (abfd) bfd *abfd; { boolean ret; if (!bfd_read_p (abfd)) { if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd))) return false; } if (! BFD_SEND (abfd, _close_and_cleanup, (abfd))) return false; ret = bfd_cache_close (abfd); /* If the file was open for writing and is now executable, make it so */ if (ret && abfd->direction == write_direction && abfd->flags & EXEC_P) { struct stat buf; if (stat (abfd->filename, &buf) == 0) { int mask = umask (0); umask (mask); chmod (abfd->filename, (0777 & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); } } (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 Close a BFD. 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 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 && abfd->direction == write_direction && abfd->flags & EXEC_P) { struct stat buf; if (stat (abfd->filename, &buf) == 0) { int mask = umask (0); umask (mask); chmod (abfd->filename, (0x777 & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask)))); } } (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 @var{abfd}. */ bfd_size_type 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 Create 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 * bfd_create (filename, templ) CONST char *filename; bfd *templ; { bfd *nbfd = _bfd_new_bfd(); if (nbfd == (bfd *)NULL) 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 Allocate a block of @var{wanted} bytes of memory in the obstack attatched to <> and return a pointer to it. */ PTR bfd_alloc_by_size_t (abfd, size) bfd *abfd; size_t size; { PTR ret; ret = obstack_alloc (&(abfd->memory), size); if (ret == NULL) bfd_set_error (bfd_error_no_memory); return ret; } void bfd_alloc_grow (abfd, ptr, size) bfd *abfd; PTR ptr; size_t size; { (void) obstack_grow(&(abfd->memory), ptr, size); } PTR bfd_alloc_finish (abfd) bfd *abfd; { PTR ret; ret = obstack_finish (&(abfd->memory)); if (ret == NULL) bfd_set_error (bfd_error_no_memory); return ret; } PTR bfd_alloc (abfd, size) bfd *abfd; size_t size; { return bfd_alloc_by_size_t(abfd, (size_t)size); } PTR bfd_zalloc (abfd, size) bfd *abfd; size_t size; { PTR res; res = bfd_alloc(abfd, size); if (res) memset(res, 0, (size_t)size); return res; }