Commit | Line | Data |
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ab422c4d PE |
1 | /* Copyright (C) 1985-1988, 1992-1994, 2001-2013 Free Software |
2 | * Foundation, Inc. | |
7dd63af1 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
9ec0b715 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
7dd63af1 | 7 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
7dd63af1 RS |
10 | |
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
7dd63af1 RS |
18 | |
19 | ||
20 | /* | |
29cf3e20 EZ |
21 | * unexcoff.c - Convert a running program into an a.out or COFF file. |
22 | * | |
23 | * ================================================================== | |
24 | * Note: This file is currently used only by the MSDOS (a.k.a. DJGPP) | |
25 | * build of Emacs. If you are not interested in the MSDOS build, you | |
26 | * are looking at the wrong version of unexec! | |
27 | * ================================================================== | |
7dd63af1 RS |
28 | * |
29 | * Author: Spencer W. Thomas | |
30 | * Computer Science Dept. | |
31 | * University of Utah | |
32 | * Date: Tue Mar 2 1982 | |
29cf3e20 | 33 | * Originally under the name unexec.c. |
7dd63af1 RS |
34 | * Modified heavily since then. |
35 | * | |
36 | * Synopsis: | |
dd5ecd6b | 37 | * unexec (const char *new_name, const char *old_name); |
7dd63af1 RS |
38 | * |
39 | * Takes a snapshot of the program and makes an a.out format file in the | |
40 | * file named by the string argument new_name. | |
41 | * If a_name is non-NULL, the symbol table will be taken from the given file. | |
42 | * On some machines, an existing a_name file is required. | |
43 | * | |
7dd63af1 RS |
44 | * If you make improvements I'd like to get them too. |
45 | * harpo!utah-cs!thomas, thomas@Utah-20 | |
46 | * | |
47 | */ | |
48 | ||
49 | /* Modified to support SysVr3 shared libraries by James Van Artsdalen | |
50 | * of Dell Computer Corporation. james@bigtex.cactus.org. | |
51 | */ | |
52 | ||
18160b98 | 53 | #include <config.h> |
ce701a33 PE |
54 | #include "unexec.h" |
55 | ||
7dd63af1 | 56 | #define PERROR(file) report_error (file, new) |
7dd63af1 RS |
57 | |
58 | #ifndef CANNOT_DUMP /* all rest of file! */ | |
59 | ||
f914a6bf | 60 | #ifdef HAVE_COFF_H |
2a4487ac | 61 | #include <coff.h> |
3680bdc6 | 62 | #ifdef MSDOS |
8eb2807f | 63 | #include <fcntl.h> /* for O_RDONLY, O_RDWR */ |
c17a2102 | 64 | #include <crt0.h> /* for _crt0_startup_flags and its bits */ |
5f2f0bc1 | 65 | #include <sys/exceptn.h> |
c17a2102 | 66 | static int save_djgpp_startup_flags; |
3680bdc6 RS |
67 | #define filehdr external_filehdr |
68 | #define scnhdr external_scnhdr | |
69 | #define syment external_syment | |
70 | #define auxent external_auxent | |
71 | #define n_numaux e_numaux | |
72 | #define n_type e_type | |
73 | struct aouthdr | |
74 | { | |
234d3183 RS |
75 | unsigned short magic; /* type of file */ |
76 | unsigned short vstamp; /* version stamp */ | |
77 | unsigned long tsize; /* text size in bytes, padded to FW bdry*/ | |
78 | unsigned long dsize; /* initialized data " " */ | |
79 | unsigned long bsize; /* uninitialized data " " */ | |
80 | unsigned long entry; /* entry pt. */ | |
81 | unsigned long text_start;/* base of text used for this file */ | |
82 | unsigned long data_start;/* base of data used for this file */ | |
3680bdc6 | 83 | }; |
3680bdc6 | 84 | #endif /* not MSDOS */ |
f914a6bf | 85 | #else /* not HAVE_COFF_H */ |
8d228cb0 | 86 | #include <a.out.h> |
f914a6bf | 87 | #endif /* not HAVE_COFF_H */ |
265a9e55 | 88 | |
f34e2e18 RS |
89 | /* Define getpagesize if the system does not. |
90 | Note that this may depend on symbols defined in a.out.h. */ | |
7dd63af1 RS |
91 | #include "getpagesize.h" |
92 | ||
93 | #ifndef makedev /* Try to detect types.h already loaded */ | |
94 | #include <sys/types.h> | |
265a9e55 | 95 | #endif /* makedev */ |
7dd63af1 RS |
96 | #include <stdio.h> |
97 | #include <sys/stat.h> | |
98 | #include <errno.h> | |
99 | ||
f914a6bf | 100 | #include <sys/file.h> |
2d30a233 | 101 | |
1ddc2bd6 | 102 | extern int etext; |
7dd63af1 | 103 | |
7dd63af1 RS |
104 | static long block_copy_start; /* Old executable start point */ |
105 | static struct filehdr f_hdr; /* File header */ | |
106 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ | |
107 | long bias; /* Bias to add for growth */ | |
108 | long lnnoptr; /* Pointer to line-number info within file */ | |
109 | #define SYMS_START block_copy_start | |
110 | ||
111 | static long text_scnptr; | |
112 | static long data_scnptr; | |
113 | ||
c8b14b5f RS |
114 | static long coff_offset; |
115 | ||
7dd63af1 RS |
116 | static int pagemask; |
117 | ||
118 | /* Correct an int which is the bit pattern of a pointer to a byte | |
119 | into an int which is the number of a byte. | |
120 | This is a no-op on ordinary machines, but not on all. */ | |
121 | ||
7dd63af1 | 122 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) |
7dd63af1 | 123 | |
2d30a233 RM |
124 | #include "lisp.h" |
125 | ||
5f2f0bc1 EZ |
126 | static void |
127 | report_error (const char *file, int fd) | |
7dd63af1 RS |
128 | { |
129 | if (fd) | |
130 | close (fd); | |
2d30a233 | 131 | report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil)); |
7dd63af1 | 132 | } |
7dd63af1 RS |
133 | |
134 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 | |
135 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 | |
136 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 | |
137 | ||
5f2f0bc1 EZ |
138 | static void |
139 | report_error_1 (int fd, const char *msg, int a1, int a2) | |
7dd63af1 RS |
140 | { |
141 | close (fd); | |
7dd63af1 | 142 | error (msg, a1, a2); |
7dd63af1 RS |
143 | } |
144 | \f | |
c3911ead | 145 | static int make_hdr (int, int, const char *, const char *); |
5f2f0bc1 EZ |
146 | static int copy_text_and_data (int, int); |
147 | static int copy_sym (int, int, const char *, const char *); | |
148 | static void mark_x (const char *); | |
7dd63af1 | 149 | |
7dd63af1 RS |
150 | /* **************************************************************** |
151 | * make_hdr | |
152 | * | |
153 | * Make the header in the new a.out from the header in core. | |
154 | * Modify the text and data sizes. | |
155 | */ | |
156 | static int | |
dd5ecd6b DN |
157 | make_hdr (int new, int a_out, |
158 | const char *a_name, const char *new_name) | |
7dd63af1 | 159 | { |
7dd63af1 RS |
160 | auto struct scnhdr f_thdr; /* Text section header */ |
161 | auto struct scnhdr f_dhdr; /* Data section header */ | |
162 | auto struct scnhdr f_bhdr; /* Bss section header */ | |
163 | auto struct scnhdr scntemp; /* Temporary section header */ | |
164 | register int scns; | |
dd5ecd6b DN |
165 | unsigned int bss_start; |
166 | unsigned int data_start; | |
7dd63af1 RS |
167 | |
168 | pagemask = getpagesize () - 1; | |
169 | ||
170 | /* Adjust text/data boundary. */ | |
1ddc2bd6 | 171 | data_start = (int) DATA_START; |
7dd63af1 | 172 | data_start = ADDR_CORRECT (data_start); |
7dd63af1 | 173 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
7dd63af1 | 174 | |
dd5ecd6b DN |
175 | bss_start = ADDR_CORRECT (sbrk (0)) + pagemask; |
176 | bss_start &= ~ pagemask; | |
7dd63af1 RS |
177 | |
178 | if (data_start > bss_start) /* Can't have negative data size. */ | |
179 | { | |
180 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", | |
181 | data_start, bss_start); | |
182 | } | |
183 | ||
c8b14b5f RS |
184 | coff_offset = 0L; /* stays zero, except in DJGPP */ |
185 | ||
7dd63af1 RS |
186 | /* Salvage as much info from the existing file as possible */ |
187 | if (a_out >= 0) | |
188 | { | |
c8b14b5f | 189 | #ifdef MSDOS |
c8b14b5f RS |
190 | /* Support the coff-go32-exe format with a prepended stub, since |
191 | this is what GCC 2.8.0 and later generates by default in DJGPP. */ | |
192 | unsigned short mz_header[3]; | |
193 | ||
194 | if (read (a_out, &mz_header, sizeof (mz_header)) != sizeof (mz_header)) | |
195 | { | |
196 | PERROR (a_name); | |
197 | } | |
198 | if (mz_header[0] == 0x5a4d || mz_header[0] == 0x4d5a) /* "MZ" or "ZM" */ | |
199 | { | |
200 | coff_offset = (long)mz_header[2] * 512L; | |
201 | if (mz_header[1]) | |
202 | coff_offset += (long)mz_header[1] - 512L; | |
203 | lseek (a_out, coff_offset, 0); | |
204 | } | |
205 | else | |
206 | lseek (a_out, 0L, 0); | |
c8b14b5f | 207 | #endif /* MSDOS */ |
7dd63af1 RS |
208 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
209 | { | |
210 | PERROR (a_name); | |
211 | } | |
212 | block_copy_start += sizeof (f_hdr); | |
213 | if (f_hdr.f_opthdr > 0) | |
214 | { | |
215 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
216 | { | |
217 | PERROR (a_name); | |
218 | } | |
219 | block_copy_start += sizeof (f_ohdr); | |
220 | } | |
221 | /* Loop through section headers, copying them in */ | |
c8b14b5f | 222 | lseek (a_out, coff_offset + sizeof (f_hdr) + f_hdr.f_opthdr, 0); |
7dd63af1 RS |
223 | for (scns = f_hdr.f_nscns; scns > 0; scns--) { |
224 | if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp)) | |
225 | { | |
226 | PERROR (a_name); | |
227 | } | |
228 | if (scntemp.s_scnptr > 0L) | |
229 | { | |
230 | if (block_copy_start < scntemp.s_scnptr + scntemp.s_size) | |
231 | block_copy_start = scntemp.s_scnptr + scntemp.s_size; | |
232 | } | |
233 | if (strcmp (scntemp.s_name, ".text") == 0) | |
234 | { | |
235 | f_thdr = scntemp; | |
236 | } | |
237 | else if (strcmp (scntemp.s_name, ".data") == 0) | |
238 | { | |
239 | f_dhdr = scntemp; | |
240 | } | |
241 | else if (strcmp (scntemp.s_name, ".bss") == 0) | |
242 | { | |
243 | f_bhdr = scntemp; | |
244 | } | |
245 | } | |
246 | } | |
247 | else | |
248 | { | |
249 | ERROR0 ("can't build a COFF file from scratch yet"); | |
250 | } | |
251 | ||
252 | /* Now we alter the contents of all the f_*hdr variables | |
253 | to correspond to what we want to dump. */ | |
254 | ||
7dd63af1 | 255 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); |
7dd63af1 | 256 | f_ohdr.dsize = bss_start - f_ohdr.data_start; |
dd5ecd6b | 257 | f_ohdr.bsize = 0; |
7dd63af1 RS |
258 | f_thdr.s_size = f_ohdr.tsize; |
259 | f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr); | |
260 | f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr)); | |
7dd63af1 | 261 | lnnoptr = f_thdr.s_lnnoptr; |
7dd63af1 | 262 | text_scnptr = f_thdr.s_scnptr; |
7dd63af1 | 263 | f_dhdr.s_paddr = f_ohdr.data_start; |
7dd63af1 RS |
264 | f_dhdr.s_vaddr = f_ohdr.data_start; |
265 | f_dhdr.s_size = f_ohdr.dsize; | |
266 | f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size; | |
7dd63af1 | 267 | data_scnptr = f_dhdr.s_scnptr; |
7dd63af1 | 268 | f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize; |
7dd63af1 RS |
269 | f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize; |
270 | f_bhdr.s_size = f_ohdr.bsize; | |
271 | f_bhdr.s_scnptr = 0L; | |
7dd63af1 | 272 | bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start; |
7dd63af1 RS |
273 | |
274 | if (f_hdr.f_symptr > 0L) | |
275 | { | |
276 | f_hdr.f_symptr += bias; | |
277 | } | |
278 | ||
279 | if (f_thdr.s_lnnoptr > 0L) | |
280 | { | |
281 | f_thdr.s_lnnoptr += bias; | |
282 | } | |
283 | ||
7dd63af1 RS |
284 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
285 | { | |
286 | PERROR (new_name); | |
287 | } | |
288 | ||
289 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) | |
290 | { | |
291 | PERROR (new_name); | |
292 | } | |
293 | ||
7dd63af1 RS |
294 | if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr)) |
295 | { | |
296 | PERROR (new_name); | |
297 | } | |
298 | ||
299 | if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr)) | |
300 | { | |
301 | PERROR (new_name); | |
302 | } | |
303 | ||
304 | if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr)) | |
305 | { | |
306 | PERROR (new_name); | |
307 | } | |
308 | ||
7dd63af1 RS |
309 | return (0); |
310 | ||
7dd63af1 RS |
311 | } |
312 | \f | |
5f2f0bc1 EZ |
313 | void |
314 | write_segment (int new, const char *ptr, const char *end) | |
730f4d72 EZ |
315 | { |
316 | register int i, nwrite, ret; | |
730f4d72 EZ |
317 | /* This is the normal amount to write at once. |
318 | It is the size of block that NFS uses. */ | |
319 | int writesize = 1 << 13; | |
320 | int pagesize = getpagesize (); | |
321 | char zeros[1 << 13]; | |
322 | ||
72af86bd | 323 | memset (zeros, 0, sizeof (zeros)); |
730f4d72 EZ |
324 | |
325 | for (i = 0; ptr < end;) | |
326 | { | |
327 | /* Distance to next multiple of writesize. */ | |
328 | nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr; | |
329 | /* But not beyond specified end. */ | |
330 | if (nwrite > end - ptr) nwrite = end - ptr; | |
331 | ret = write (new, ptr, nwrite); | |
332 | /* If write gets a page fault, it means we reached | |
333 | a gap between the old text segment and the old data segment. | |
334 | This gap has probably been remapped into part of the text segment. | |
335 | So write zeros for it. */ | |
22626a85 | 336 | if (ret == -1 && errno == EFAULT) |
730f4d72 EZ |
337 | { |
338 | /* Write only a page of zeros at once, | |
2b34df4e | 339 | so that we don't overshoot the start |
730f4d72 EZ |
340 | of the valid memory in the old data segment. */ |
341 | if (nwrite > pagesize) | |
342 | nwrite = pagesize; | |
343 | write (new, zeros, nwrite); | |
344 | } | |
730f4d72 EZ |
345 | i += nwrite; |
346 | ptr += nwrite; | |
347 | } | |
348 | } | |
7dd63af1 RS |
349 | /* **************************************************************** |
350 | * copy_text_and_data | |
351 | * | |
352 | * Copy the text and data segments from memory to the new a.out | |
353 | */ | |
354 | static int | |
5f2f0bc1 | 355 | copy_text_and_data (int new, int a_out) |
7dd63af1 RS |
356 | { |
357 | register char *end; | |
358 | register char *ptr; | |
359 | ||
8eb2807f | 360 | #ifdef MSDOS |
8eb2807f RS |
361 | /* Dump the original table of exception handlers, not the one |
362 | where our exception hooks are registered. */ | |
363 | __djgpp_exception_toggle (); | |
c17a2102 KH |
364 | |
365 | /* Switch off startup flags that might have been set at runtime | |
366 | and which might change the way that dumped Emacs works. */ | |
367 | save_djgpp_startup_flags = _crt0_startup_flags; | |
368 | _crt0_startup_flags &= ~(_CRT0_FLAG_NO_LFN | _CRT0_FLAG_NEARPTR); | |
8eb2807f RS |
369 | #endif |
370 | ||
7dd63af1 RS |
371 | lseek (new, (long) text_scnptr, 0); |
372 | ptr = (char *) f_ohdr.text_start; | |
7dd63af1 RS |
373 | end = ptr + f_ohdr.tsize; |
374 | write_segment (new, ptr, end); | |
375 | ||
376 | lseek (new, (long) data_scnptr, 0); | |
377 | ptr = (char *) f_ohdr.data_start; | |
378 | end = ptr + f_ohdr.dsize; | |
379 | write_segment (new, ptr, end); | |
380 | ||
8eb2807f | 381 | #ifdef MSDOS |
8eb2807f RS |
382 | /* Restore our exception hooks. */ |
383 | __djgpp_exception_toggle (); | |
c17a2102 KH |
384 | |
385 | /* Restore the startup flags. */ | |
386 | _crt0_startup_flags = save_djgpp_startup_flags; | |
8eb2807f | 387 | #endif |
8eb2807f | 388 | |
7dd63af1 RS |
389 | |
390 | return 0; | |
391 | } | |
7dd63af1 RS |
392 | \f |
393 | /* **************************************************************** | |
394 | * copy_sym | |
395 | * | |
396 | * Copy the relocation information and symbol table from the a.out to the new | |
397 | */ | |
398 | static int | |
5f2f0bc1 | 399 | copy_sym (int new, int a_out, const char *a_name, const char *new_name) |
7dd63af1 RS |
400 | { |
401 | char page[1024]; | |
402 | int n; | |
403 | ||
404 | if (a_out < 0) | |
405 | return 0; | |
406 | ||
7dd63af1 RS |
407 | if (SYMS_START == 0L) |
408 | return 0; | |
7dd63af1 | 409 | |
7dd63af1 | 410 | if (lnnoptr) /* if there is line number info */ |
c8b14b5f | 411 | lseek (a_out, coff_offset + lnnoptr, 0); /* start copying from there */ |
7dd63af1 | 412 | else |
c8b14b5f | 413 | lseek (a_out, coff_offset + SYMS_START, 0); /* Position a.out to symtab. */ |
7dd63af1 RS |
414 | |
415 | while ((n = read (a_out, page, sizeof page)) > 0) | |
416 | { | |
417 | if (write (new, page, n) != n) | |
418 | { | |
419 | PERROR (new_name); | |
420 | } | |
421 | } | |
422 | if (n < 0) | |
423 | { | |
424 | PERROR (a_name); | |
425 | } | |
426 | return 0; | |
427 | } | |
428 | \f | |
429 | /* **************************************************************** | |
430 | * mark_x | |
431 | * | |
eb8c3be9 | 432 | * After successfully building the new a.out, mark it executable |
7dd63af1 RS |
433 | */ |
434 | static void | |
5f2f0bc1 | 435 | mark_x (const char *name) |
7dd63af1 RS |
436 | { |
437 | struct stat sbuf; | |
438 | int um; | |
439 | int new = 0; /* for PERROR */ | |
440 | ||
441 | um = umask (777); | |
442 | umask (um); | |
443 | if (stat (name, &sbuf) == -1) | |
444 | { | |
445 | PERROR (name); | |
446 | } | |
447 | sbuf.st_mode |= 0111 & ~um; | |
448 | if (chmod (name, sbuf.st_mode) == -1) | |
449 | PERROR (name); | |
450 | } | |
451 | \f | |
7dd63af1 RS |
452 | |
453 | /* | |
454 | * If the COFF file contains a symbol table and a line number section, | |
455 | * then any auxiliary entries that have values for x_lnnoptr must | |
456 | * be adjusted by the amount that the line number section has moved | |
457 | * in the file (bias computed in make_hdr). The #@$%&* designers of | |
458 | * the auxiliary entry structures used the absolute file offsets for | |
459 | * the line number entry rather than an offset from the start of the | |
460 | * line number section! | |
461 | * | |
462 | * When I figure out how to scan through the symbol table and pick out | |
463 | * the auxiliary entries that need adjustment, this routine will | |
464 | * be fixed. As it is now, all such entries are wrong and sdb | |
465 | * will complain. Fred Fish, UniSoft Systems Inc. | |
466 | */ | |
467 | ||
468 | /* This function is probably very slow. Instead of reopening the new | |
469 | file for input and output it should copy from the old to the new | |
470 | using the two descriptors already open (WRITEDESC and READDESC). | |
471 | Instead of reading one small structure at a time it should use | |
472 | a reasonable size buffer. But I don't have time to work on such | |
473 | things, so I am installing it as submitted to me. -- RMS. */ | |
474 | ||
5f2f0bc1 EZ |
475 | int |
476 | adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name) | |
7dd63af1 RS |
477 | { |
478 | register int nsyms; | |
479 | register int new; | |
7dd63af1 RS |
480 | struct syment symentry; |
481 | union auxent auxentry; | |
7dd63af1 RS |
482 | |
483 | if (!lnnoptr || !f_hdr.f_symptr) | |
484 | return 0; | |
485 | ||
3680bdc6 RS |
486 | #ifdef MSDOS |
487 | if ((new = writedesc) < 0) | |
488 | #else | |
2d30a233 | 489 | if ((new = open (new_name, O_RDWR)) < 0) |
3680bdc6 | 490 | #endif |
7dd63af1 RS |
491 | { |
492 | PERROR (new_name); | |
493 | return -1; | |
494 | } | |
495 | ||
496 | lseek (new, f_hdr.f_symptr, 0); | |
497 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) | |
498 | { | |
499 | read (new, &symentry, SYMESZ); | |
500 | if (symentry.n_numaux) | |
501 | { | |
502 | read (new, &auxentry, AUXESZ); | |
503 | nsyms++; | |
1ba3de00 RS |
504 | if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400) |
505 | { | |
506 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; | |
507 | lseek (new, -AUXESZ, 1); | |
508 | write (new, &auxentry, AUXESZ); | |
509 | } | |
7dd63af1 RS |
510 | } |
511 | } | |
3680bdc6 | 512 | #ifndef MSDOS |
7dd63af1 | 513 | close (new); |
3680bdc6 RS |
514 | #endif |
515 | return 0; | |
7dd63af1 RS |
516 | } |
517 | ||
730f4d72 EZ |
518 | /* **************************************************************** |
519 | * unexec | |
520 | * | |
521 | * driving logic. | |
522 | */ | |
381259ef | 523 | void |
dd5ecd6b | 524 | unexec (const char *new_name, const char *a_name) |
730f4d72 | 525 | { |
5f2f0bc1 | 526 | int new = -1, a_out = -1; |
730f4d72 EZ |
527 | |
528 | if (a_name && (a_out = open (a_name, O_RDONLY)) < 0) | |
529 | { | |
530 | PERROR (a_name); | |
531 | } | |
532 | if ((new = creat (new_name, 0666)) < 0) | |
533 | { | |
534 | PERROR (new_name); | |
535 | } | |
536 | ||
dd5ecd6b | 537 | if (make_hdr (new, a_out, a_name, new_name) < 0 |
730f4d72 EZ |
538 | || copy_text_and_data (new, a_out) < 0 |
539 | || copy_sym (new, a_out, a_name, new_name) < 0 | |
730f4d72 | 540 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
730f4d72 EZ |
541 | ) |
542 | { | |
543 | close (new); | |
fffe2e14 | 544 | return; |
730f4d72 EZ |
545 | } |
546 | ||
547 | close (new); | |
548 | if (a_out >= 0) | |
549 | close (a_out); | |
550 | mark_x (new_name); | |
730f4d72 EZ |
551 | } |
552 | ||
7dd63af1 | 553 | #endif /* not CANNOT_DUMP */ |