1 /* opncls.c -- open and close a BFD.
2 Copyright (C) 1990-1991 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 extern void bfd_cache_init PARAMS ((bfd *));
26 FILE *bfd_open_file PARAMS ((bfd *));
28 /* fdopen is a loser -- we should use stdio exclusively. Unfortunately
29 if we do that we can't use fcntl. */
32 #define obstack_chunk_alloc bfd_xmalloc_by_size_t
33 #define obstack_chunk_free free
35 /* Return a new BFD. All BFD's are allocated through this routine. */
38 new_bfd PARAMS ((void))
42 nbfd = (bfd *)zalloc (sizeof (bfd));
47 obstack_begin((PTR)&nbfd->memory, 128);
49 nbfd->arch_info = &bfd_default_arch_struct;
51 nbfd->direction = no_direction;
52 nbfd->iostream = NULL;
54 nbfd->sections = (asection *)NULL;
55 nbfd->format = bfd_unknown;
56 nbfd->my_archive = (bfd *)NULL;
58 nbfd->opened_once = false;
59 nbfd->output_has_begun = false;
60 nbfd->section_count = 0;
61 nbfd->usrdata = (PTR)NULL;
62 nbfd->cacheable = false;
63 nbfd->flags = NO_FLAGS;
64 nbfd->mtime_set = false;
69 /* Allocate a new BFD as a member of archive OBFD. */
72 new_bfd_contained_in (obfd)
78 nbfd->xvec = obfd->xvec;
79 nbfd->my_archive = obfd;
80 nbfd->direction = read_direction;
81 nbfd->target_defaulted = obfd->target_defaulted;
87 Opening and Closing BFDs
96 bfd *bfd_openr(CONST char *filename, CONST char*target);
99 This function opens the file supplied (using <<fopen>>) with the target
100 supplied, it returns a pointer to the created BFD.
102 If NULL is returned then an error has occured. Possible errors
103 are <<no_memory>>, <<invalid_target>> or <<system_call>> error.
107 DEFUN(bfd_openr, (filename, target),
108 CONST char *filename AND
112 bfd_target *target_vec;
116 bfd_error = no_memory;
120 target_vec = bfd_find_target (target, nbfd);
121 if (target_vec == NULL) {
122 bfd_error = invalid_target;
126 nbfd->filename = filename;
127 nbfd->direction = read_direction;
129 if (bfd_open_file (nbfd) == NULL) {
130 bfd_error = system_call_error; /* File didn't exist, or some such */
138 /* Don't try to `optimize' this function:
140 o - We lock using stack space so that interrupting the locking
141 won't cause a storage leak.
142 o - We open the file stream last, since we don't want to have to
143 close it if anything goes wrong. Closing the stream means closing
144 the file descriptor too, even though we didn't open it.
151 bfd *bfd_fdopenr(CONST char *filename, CONST char *target, int fd);
154 bfd_fdopenr is to bfd_fopenr much like fdopen is to fopen.
155 It opens a BFD on a file already described by the @var{fd}
158 When the file is later bfd_closed, the file descriptor will be closed.
160 If the caller desires that this file descriptor be cached by BFD
161 (opened as needed, closed as needed to free descriptors for
162 other opens), with the supplied @var{fd} used as an initial
163 file descriptor (but subject to closure at any time), call
164 bfd_set_cacheable(bfd, 1) on the returned BFD. The default is to
165 assume no cacheing; the file descriptor will remain open until
166 bfd_close, and will not be affected by BFD operations on other
169 Possible errors are no_memory, invalid_target and system_call
174 DEFUN(bfd_fdopenr,(filename, target, fd),
175 CONST char *filename AND
176 CONST char *target AND
180 bfd_target *target_vec;
183 bfd_error = system_call_error;
186 fdflags = O_RDWR; /* Assume full access */
188 fdflags = fcntl (fd, F_GETFL, NULL);
190 if (fdflags == -1) return NULL;
195 bfd_error = no_memory;
199 target_vec = bfd_find_target (target, nbfd);
200 if (target_vec == NULL) {
201 bfd_error = invalid_target;
204 #if defined(VMS) || defined(__GO32__)
205 nbfd->iostream = (char *)fopen(filename, FOPEN_RB);
207 /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
208 switch (fdflags & (O_ACCMODE)) {
209 case O_RDONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RB); break;
210 case O_WRONLY: nbfd->iostream = (char *) fdopen (fd, FOPEN_RUB); break;
211 case O_RDWR: nbfd->iostream = (char *) fdopen (fd, FOPEN_RUB); break;
215 if (nbfd->iostream == NULL) {
216 (void) obstack_free (&nbfd->memory, (PTR)0);
220 /* OK, put everything where it belongs */
222 nbfd->filename = filename;
224 /* As a special case we allow a FD open for read/write to
225 be written through, although doing so requires that we end
226 the previous clause with a preposition. */
227 /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
228 switch (fdflags & (O_ACCMODE)) {
229 case O_RDONLY: nbfd->direction = read_direction; break;
230 case O_WRONLY: nbfd->direction = write_direction; break;
231 case O_RDWR: nbfd->direction = both_direction; break;
235 bfd_cache_init (nbfd);
240 /** bfd_openw -- open for writing.
241 Returns a pointer to a freshly-allocated BFD on success, or NULL.
243 See comment by bfd_fdopenr before you try to modify this function. */
250 bfd *bfd_openw(CONST char *filename, CONST char *target);
253 Creates a BFD, associated with file @var{filename}, using the
254 file format @var{target}, and returns a pointer to it.
256 Possible errors are system_call_error, no_memory,
261 DEFUN(bfd_openw,(filename, target),
262 CONST char *filename AND
266 bfd_target *target_vec;
268 bfd_error = system_call_error;
270 /* nbfd has to point to head of malloc'ed block so that bfd_close may
271 reclaim it correctly. */
275 bfd_error = no_memory;
279 target_vec = bfd_find_target (target, nbfd);
280 if (target_vec == NULL) return NULL;
282 nbfd->filename = filename;
283 nbfd->direction = write_direction;
285 if (bfd_open_file (nbfd) == NULL) {
286 bfd_error = system_call_error; /* File not writeable, etc */
287 (void) obstack_free (&nbfd->memory, (PTR)0);
299 boolean bfd_close(bfd *);
303 This function closes a BFD. If the BFD was open for writing,
304 then pending operations are completed and the file written out
305 and closed. If the created file is executable, then
306 <<chmod>> is called to mark it as such.
308 All memory attached to the BFD's obstacks is released.
310 The file descriptor associated with the BFD is closed (even
311 if it was passed in to BFD by bfd_fdopenr).
314 <<true>> is returned if all is ok, otherwise <<false>>.
319 DEFUN(bfd_close,(abfd),
324 if (!bfd_read_p(abfd))
325 if (BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)) != true)
328 if (BFD_SEND (abfd, _close_and_cleanup, (abfd)) != true) return false;
330 ret = bfd_cache_close(abfd);
332 /* If the file was open for writing and is now executable,
335 && abfd->direction == write_direction
336 && abfd->flags & EXEC_P) {
338 stat(abfd->filename, &buf);
340 #define S_IXUSR 0100 /* Execute by owner. */
343 #define S_IXGRP 0010 /* Execute by group. */
346 #define S_IXOTH 0001 /* Execute by others. */
349 chmod(abfd->filename, 0777 & (buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH));
351 (void) obstack_free (&abfd->memory, (PTR)0);
361 boolean bfd_close_all_done(bfd *);
364 This function closes a BFD. It differs from <<bfd_close>>
365 since it does not complete any pending operations. This
366 routine would be used if the application had just used BFD for
367 swapping and didn't want to use any of the writing code.
369 If the created file is executable, then <<chmod>> is called
372 All memory attached to the BFD's obstacks is released.
375 <<true>> is returned if all is ok, otherwise <<false>>.
380 DEFUN(bfd_close_all_done,(abfd),
385 ret = bfd_cache_close(abfd);
387 /* If the file was open for writing and is now executable,
390 && abfd->direction == write_direction
391 && abfd->flags & EXEC_P) {
393 stat(abfd->filename, &buf);
395 #define S_IXUSR 0100 /* Execute by owner. */
398 #define S_IXGRP 0010 /* Execute by group. */
401 #define S_IXOTH 0001 /* Execute by others. */
404 chmod(abfd->filename, 0x777 &(buf.st_mode | S_IXUSR | S_IXGRP | S_IXOTH));
406 (void) obstack_free (&abfd->memory, (PTR)0);
417 bfd_size_type bfd_alloc_size(bfd *abfd);
420 Return the number of bytes in the obstacks connected to the
426 DEFUN(bfd_alloc_size,(abfd),
429 struct _obstack_chunk *chunk = abfd->memory.chunk;
432 size += chunk->limit - &(chunk->contents[0]);
445 bfd *bfd_create(CONST char *filename, bfd *templ);
448 This routine creates a new BFD in the manner of
449 <<bfd_openw>>, but without opening a file. The new BFD
450 takes the target from the target used by @var{template}. The
451 format is always set to <<bfd_object>>.
456 DEFUN(bfd_create,(filename, templ),
457 CONST char *filename AND
460 bfd *nbfd = new_bfd();
461 if (nbfd == (bfd *)NULL) {
462 bfd_error = no_memory;
465 nbfd->filename = filename;
467 nbfd->xvec = templ->xvec;
469 nbfd->direction = no_direction;
470 bfd_set_format(nbfd, bfd_object);
479 PTR bfd_alloc_by_size_t(bfd *abfd, size_t wanted);
482 This function allocates a block of memory in the obstack
483 attatched to <<abfd>> and returns a pointer to it.
488 DEFUN(bfd_alloc_by_size_t,(abfd, size),
492 PTR res = obstack_alloc(&(abfd->memory), size);
496 DEFUN(void bfd_alloc_grow,(abfd, ptr, size),
501 (void) obstack_grow(&(abfd->memory), ptr, size);
503 DEFUN(PTR bfd_alloc_finish,(abfd),
506 return obstack_finish(&(abfd->memory));
509 DEFUN(PTR bfd_alloc, (abfd, size),
513 return bfd_alloc_by_size_t(abfd, (size_t)size);
516 DEFUN(PTR bfd_zalloc,(abfd, size),
521 res = bfd_alloc(abfd, size);
522 memset(res, 0, (size_t)size);
526 DEFUN(PTR bfd_realloc,(abfd, old, size),
531 PTR res = bfd_alloc(abfd, size);
532 memcpy(res, old, (size_t)size);