Commit | Line | Data |
---|---|---|
b061d5f1 RS |
1 | /* Unexec for DEC alpha. schoepf@sc.ZIB-Berlin.DE (Rainer Schoepf). |
2 | ||
3 | Copyright (C) 1994 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs 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, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU Emacs 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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b061d5f1 RS |
21 | |
22 | \f | |
23 | #include <config.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/file.h> | |
26 | #include <sys/stat.h> | |
27 | #include <sys/mman.h> | |
28 | #include <stdio.h> | |
29 | #include <varargs.h> | |
61e63089 | 30 | #if !defined (__NetBSD__) && !defined (__OpenBSD__) |
b061d5f1 RS |
31 | #include <filehdr.h> |
32 | #include <aouthdr.h> | |
33 | #include <scnhdr.h> | |
34 | #include <syms.h> | |
d7b43eaa RS |
35 | #ifndef __linux__ |
36 | # include <reloc.h> | |
37 | # include <elf_abi.h> | |
38 | #endif | |
61e63089 | 39 | #else /* __NetBSD__ or __OpenBSD__ */ |
6538ee2e RS |
40 | /* |
41 | * NetBSD/Alpha does not have 'normal' user-land ECOFF support because | |
42 | * there's no desire to support ECOFF as the executable format in the | |
43 | * long term. | |
44 | */ | |
45 | #include <sys/exec_ecoff.h> | |
46 | ||
47 | /* Structures, constants, etc., that NetBSD defines strangely. */ | |
48 | #define filehdr ecoff_filehdr | |
49 | #define aouthdr ecoff_aouthdr | |
50 | #define scnhdr ecoff_scnhdr | |
51 | #define HDRR struct ecoff_symhdr | |
52 | #define pHDRR HDRR * | |
53 | #define cbHDRR sizeof(HDRR) | |
61e63089 RS |
54 | #ifdef __OpenBSD__ |
55 | #define ALPHAMAGIC ECOFF_MAGIC_NATIVE_ALPHA | |
56 | #else | |
6538ee2e | 57 | #define ALPHAMAGIC ECOFF_MAGIC_NETBSD_ALPHA |
61e63089 | 58 | #endif |
6538ee2e RS |
59 | #define ZMAGIC ECOFF_ZMAGIC |
60 | ||
61 | /* Misc. constants that NetBSD doesn't define at all. */ | |
62 | #define ALPHAUMAGIC 0617 | |
63 | #define _MIPS_NSCNS_MAX 35 | |
64 | #define STYP_TEXT 0x00000020 | |
65 | #define STYP_DATA 0x00000040 | |
66 | #define STYP_BSS 0x00000080 | |
67 | #define STYP_RDATA 0x00000100 | |
68 | #define STYP_SDATA 0x00000200 | |
69 | #define STYP_SBSS 0x00000400 | |
70 | #define STYP_INIT 0x80000000 | |
71 | #define _TEXT ".text" | |
72 | #define _DATA ".data" | |
73 | #define _BSS ".bss" | |
74 | #define _INIT ".init" | |
75 | #define _RDATA ".rdata" | |
76 | #define _SDATA ".sdata" | |
77 | #define _SBSS ".sbss" | |
61e63089 | 78 | #endif /* __NetBSD__ || __OpenBSD__ */ |
b061d5f1 RS |
79 | |
80 | static void fatal_unexec (); | |
81 | static void mark_x (); | |
82 | ||
83 | #define READ(_fd, _buffer, _size, _error_message, _error_arg) \ | |
84 | errno = EEOF; \ | |
85 | if (read (_fd, _buffer, _size) != _size) \ | |
86 | fatal_unexec (_error_message, _error_arg); | |
87 | ||
88 | #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \ | |
89 | if (write (_fd, _buffer, _size) != _size) \ | |
90 | fatal_unexec (_error_message, _error_arg); | |
91 | ||
92 | #define SEEK(_fd, _position, _error_message, _error_arg) \ | |
93 | errno = EEOF; \ | |
94 | if (lseek (_fd, _position, L_SET) != _position) \ | |
95 | fatal_unexec (_error_message, _error_arg); | |
96 | ||
97 | extern int errno; | |
98 | extern char *strerror (); | |
99 | ||
d7b43eaa | 100 | void *sbrk (); |
b061d5f1 RS |
101 | |
102 | #define EEOF -1 | |
103 | ||
104 | static struct scnhdr *text_section; | |
d7b43eaa RS |
105 | static struct scnhdr *rel_dyn_section; |
106 | static struct scnhdr *dynstr_section; | |
107 | static struct scnhdr *dynsym_section; | |
b061d5f1 RS |
108 | static struct scnhdr *init_section; |
109 | static struct scnhdr *finit_section; | |
110 | static struct scnhdr *rdata_section; | |
866fc66a | 111 | static struct scnhdr *rconst_section; |
b061d5f1 RS |
112 | static struct scnhdr *data_section; |
113 | static struct scnhdr *pdata_section; | |
114 | static struct scnhdr *xdata_section; | |
115 | static struct scnhdr *got_section; | |
116 | static struct scnhdr *lit8_section; | |
117 | static struct scnhdr *lit4_section; | |
118 | static struct scnhdr *sdata_section; | |
119 | static struct scnhdr *sbss_section; | |
120 | static struct scnhdr *bss_section; | |
121 | ||
d7b43eaa RS |
122 | static struct scnhdr old_data_scnhdr; |
123 | ||
866fc66a | 124 | static unsigned long Brk; |
b061d5f1 RS |
125 | |
126 | struct headers { | |
127 | struct filehdr fhdr; | |
128 | struct aouthdr aout; | |
129 | struct scnhdr section[_MIPS_NSCNS_MAX]; | |
130 | }; | |
131 | ||
132 | ||
133 | ||
134 | /* Define name of label for entry point for the dumped executable. */ | |
135 | ||
136 | #ifndef DEFAULT_ENTRY_ADDRESS | |
137 | #define DEFAULT_ENTRY_ADDRESS __start | |
138 | #endif | |
139 | \f | |
140 | unexec (new_name, a_name, data_start, bss_start, entry_address) | |
141 | char *new_name, *a_name; | |
142 | unsigned long data_start, bss_start, entry_address; | |
143 | { | |
144 | int new, old; | |
145 | char * oldptr; | |
146 | struct headers ohdr, nhdr; | |
147 | struct stat stat; | |
148 | long pagesize, brk; | |
149 | long newsyms, symrel; | |
150 | int nread; | |
151 | int i; | |
152 | long vaddr, scnptr; | |
153 | #define BUFSIZE 8192 | |
154 | char buffer[BUFSIZE]; | |
155 | ||
156 | if ((old = open (a_name, O_RDONLY)) < 0) | |
157 | fatal_unexec ("opening %s", a_name); | |
158 | ||
159 | new = creat (new_name, 0666); | |
160 | if (new < 0) fatal_unexec ("creating %s", new_name); | |
161 | ||
162 | if ((fstat (old, &stat) == -1)) | |
163 | fatal_unexec ("fstat %s", a_name); | |
164 | ||
165 | oldptr = (char *)mmap (0, stat.st_size, PROT_READ, MAP_FILE|MAP_SHARED, old, 0); | |
166 | ||
167 | if (oldptr == (char *)-1) | |
168 | fatal_unexec ("mmap %s", a_name); | |
169 | ||
170 | close (old); | |
171 | ||
172 | /* This is a copy of the a.out header of the original executable */ | |
173 | ||
174 | ohdr = (*(struct headers *)oldptr); | |
175 | ||
176 | /* This is where we build the new header from the in-memory copy */ | |
177 | ||
178 | nhdr = *((struct headers *)TEXT_START); | |
179 | ||
180 | /* First do some consistency checks */ | |
181 | ||
182 | if (nhdr.fhdr.f_magic != ALPHAMAGIC | |
183 | && nhdr.fhdr.f_magic != ALPHAUMAGIC) | |
184 | { | |
185 | fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n", | |
186 | nhdr.fhdr.f_magic, ALPHAMAGIC, ALPHAUMAGIC); | |
187 | exit (1); | |
188 | } | |
189 | ||
190 | if (nhdr.fhdr.f_opthdr != sizeof (nhdr.aout)) | |
191 | { | |
192 | fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n", | |
0c08e6df | 193 | nhdr.fhdr.f_opthdr, (int)sizeof (nhdr.aout)); |
b061d5f1 RS |
194 | exit (1); |
195 | } | |
196 | if (nhdr.aout.magic != ZMAGIC) | |
197 | { | |
198 | fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n", | |
199 | nhdr.aout.magic, ZMAGIC); | |
200 | exit (1); | |
201 | } | |
202 | ||
203 | ||
204 | /* Now check the existence of certain header section and grab | |
205 | their addresses. */ | |
206 | ||
207 | #define CHECK_SCNHDR(ptr, name, flags) \ | |
208 | ptr = NULL; \ | |
209 | for (i = 0; i < nhdr.fhdr.f_nscns && !ptr; i++) \ | |
d7b43eaa | 210 | if (strncmp (nhdr.section[i].s_name, name, 8) == 0) \ |
b061d5f1 RS |
211 | { \ |
212 | if (nhdr.section[i].s_flags != flags) \ | |
213 | fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \ | |
214 | nhdr.section[i].s_flags, flags, name); \ | |
215 | ptr = nhdr.section + i; \ | |
216 | } \ | |
217 | ||
218 | CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT); | |
219 | CHECK_SCNHDR (init_section, _INIT, STYP_INIT); | |
d7b43eaa RS |
220 | #ifdef _REL_DYN |
221 | CHECK_SCNHDR (rel_dyn_section, _REL_DYN, STYP_REL_DYN); | |
222 | #endif /* _REL_DYN */ | |
223 | #ifdef _DYNSYM | |
224 | CHECK_SCNHDR (dynsym_section, _DYNSYM, STYP_DYNSYM); | |
225 | #endif /* _REL_DYN */ | |
226 | #ifdef _DYNSTR | |
227 | CHECK_SCNHDR (dynstr_section, _DYNSTR, STYP_DYNSTR); | |
228 | #endif /* _REL_DYN */ | |
b061d5f1 RS |
229 | #ifdef _FINI |
230 | CHECK_SCNHDR (finit_section, _FINI, STYP_FINI); | |
231 | #endif /* _FINI */ | |
232 | CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA); | |
866fc66a RS |
233 | #ifdef _RCONST |
234 | CHECK_SCNHDR (rconst_section, _RCONST, STYP_RCONST); | |
235 | #endif | |
b061d5f1 RS |
236 | #ifdef _PDATA |
237 | CHECK_SCNHDR (pdata_section, _PDATA, STYP_PDATA); | |
238 | #endif _PDATA | |
239 | #ifdef _GOT | |
240 | CHECK_SCNHDR (got_section, _GOT, STYP_GOT); | |
241 | #endif _GOT | |
242 | CHECK_SCNHDR (data_section, _DATA, STYP_DATA); | |
243 | #ifdef _XDATA | |
244 | CHECK_SCNHDR (xdata_section, _XDATA, STYP_XDATA); | |
245 | #endif /* _XDATA */ | |
246 | #ifdef _LIT8 | |
247 | CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8); | |
248 | CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4); | |
249 | #endif /* _LIT8 */ | |
250 | CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA); | |
251 | CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS); | |
252 | CHECK_SCNHDR (bss_section, _BSS, STYP_BSS); | |
b061d5f1 RS |
253 | |
254 | ||
255 | pagesize = getpagesize (); | |
256 | brk = (((long) (sbrk (0))) + pagesize - 1) & (-pagesize); | |
257 | ||
258 | /* Remember the current break */ | |
259 | ||
260 | Brk = brk; | |
261 | ||
d7b43eaa RS |
262 | bcopy (data_section, &old_data_scnhdr, sizeof (old_data_scnhdr)); |
263 | ||
b061d5f1 RS |
264 | nhdr.aout.dsize = brk - DATA_START; |
265 | nhdr.aout.bsize = 0; | |
266 | if (entry_address == 0) | |
267 | { | |
268 | extern DEFAULT_ENTRY_ADDRESS (); | |
269 | nhdr.aout.entry = (unsigned long)DEFAULT_ENTRY_ADDRESS; | |
270 | } | |
271 | else | |
272 | nhdr.aout.entry = entry_address; | |
273 | ||
274 | nhdr.aout.bss_start = nhdr.aout.data_start + nhdr.aout.dsize; | |
b061d5f1 | 275 | |
866fc66a RS |
276 | if (rdata_section != NULL) |
277 | { | |
278 | rdata_section->s_size = data_start - DATA_START; | |
279 | ||
280 | /* Adjust start and virtual addresses of rdata_section, too. */ | |
281 | rdata_section->s_vaddr = DATA_START; | |
282 | rdata_section->s_paddr = DATA_START; | |
283 | rdata_section->s_scnptr = text_section->s_scnptr + nhdr.aout.tsize; | |
284 | } | |
b061d5f1 RS |
285 | |
286 | data_section->s_vaddr = data_start; | |
287 | data_section->s_paddr = data_start; | |
288 | data_section->s_size = brk - data_start; | |
866fc66a RS |
289 | |
290 | if (rdata_section != NULL) | |
291 | { | |
292 | data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size; | |
293 | } | |
294 | ||
b061d5f1 RS |
295 | vaddr = data_section->s_vaddr + data_section->s_size; |
296 | scnptr = data_section->s_scnptr + data_section->s_size; | |
297 | if (lit8_section != NULL) | |
298 | { | |
299 | lit8_section->s_vaddr = vaddr; | |
300 | lit8_section->s_paddr = vaddr; | |
301 | lit8_section->s_size = 0; | |
302 | lit8_section->s_scnptr = scnptr; | |
303 | } | |
304 | if (lit4_section != NULL) | |
305 | { | |
306 | lit4_section->s_vaddr = vaddr; | |
307 | lit4_section->s_paddr = vaddr; | |
308 | lit4_section->s_size = 0; | |
309 | lit4_section->s_scnptr = scnptr; | |
310 | } | |
311 | if (sdata_section != NULL) | |
312 | { | |
313 | sdata_section->s_vaddr = vaddr; | |
314 | sdata_section->s_paddr = vaddr; | |
315 | sdata_section->s_size = 0; | |
316 | sdata_section->s_scnptr = scnptr; | |
317 | } | |
318 | #ifdef _XDATA | |
319 | if (xdata_section != NULL) | |
320 | { | |
321 | xdata_section->s_vaddr = vaddr; | |
322 | xdata_section->s_paddr = vaddr; | |
323 | xdata_section->s_size = 0; | |
324 | xdata_section->s_scnptr = scnptr; | |
325 | } | |
326 | #endif | |
327 | #ifdef _GOT | |
328 | if (got_section != NULL) | |
329 | { | |
7d713448 RS |
330 | bcopy (got_section, buffer, sizeof (struct scnhdr)); |
331 | ||
b061d5f1 RS |
332 | got_section->s_vaddr = vaddr; |
333 | got_section->s_paddr = vaddr; | |
334 | got_section->s_size = 0; | |
335 | got_section->s_scnptr = scnptr; | |
336 | } | |
337 | #endif /*_GOT */ | |
338 | if (sbss_section != NULL) | |
339 | { | |
340 | sbss_section->s_vaddr = vaddr; | |
341 | sbss_section->s_paddr = vaddr; | |
342 | sbss_section->s_size = 0; | |
343 | sbss_section->s_scnptr = scnptr; | |
344 | } | |
345 | if (bss_section != NULL) | |
346 | { | |
347 | bss_section->s_vaddr = vaddr; | |
348 | bss_section->s_paddr = vaddr; | |
349 | bss_section->s_size = 0; | |
350 | bss_section->s_scnptr = scnptr; | |
351 | } | |
352 | ||
353 | WRITE (new, (char *)TEXT_START, nhdr.aout.tsize, | |
354 | "writing text section to %s", new_name); | |
355 | WRITE (new, (char *)DATA_START, nhdr.aout.dsize, | |
356 | "writing data section to %s", new_name); | |
357 | ||
7d713448 RS |
358 | #ifdef _GOT |
359 | #define old_got_section ((struct scnhdr *)buffer) | |
360 | ||
361 | if (got_section != NULL) | |
362 | { | |
363 | SEEK (new, old_got_section->s_scnptr, | |
364 | "seeking to start of got_section in %s", new_name); | |
365 | WRITE (new, oldptr + old_got_section->s_scnptr, old_got_section->s_size, | |
366 | "writing new got_section of %s", new_name); | |
367 | SEEK (new, nhdr.aout.tsize + nhdr.aout.dsize, | |
368 | "seeking to end of data section of %s", new_name); | |
369 | } | |
370 | ||
371 | #undef old_got_section | |
372 | #endif | |
b061d5f1 RS |
373 | |
374 | /* | |
375 | * Construct new symbol table header | |
376 | */ | |
377 | ||
378 | bcopy (oldptr + nhdr.fhdr.f_symptr, buffer, cbHDRR); | |
379 | ||
380 | #define symhdr ((pHDRR)buffer) | |
381 | newsyms = nhdr.aout.tsize + nhdr.aout.dsize; | |
382 | symrel = newsyms - nhdr.fhdr.f_symptr; | |
383 | nhdr.fhdr.f_symptr = newsyms; | |
384 | symhdr->cbLineOffset += symrel; | |
385 | symhdr->cbDnOffset += symrel; | |
386 | symhdr->cbPdOffset += symrel; | |
387 | symhdr->cbSymOffset += symrel; | |
388 | symhdr->cbOptOffset += symrel; | |
389 | symhdr->cbAuxOffset += symrel; | |
390 | symhdr->cbSsOffset += symrel; | |
391 | symhdr->cbSsExtOffset += symrel; | |
392 | symhdr->cbFdOffset += symrel; | |
393 | symhdr->cbRfdOffset += symrel; | |
394 | symhdr->cbExtOffset += symrel; | |
395 | ||
396 | WRITE (new, buffer, cbHDRR, "writing symbol table header of %s", new_name); | |
397 | ||
398 | /* | |
399 | * Copy the symbol table and line numbers | |
400 | */ | |
401 | WRITE (new, oldptr + ohdr.fhdr.f_symptr + cbHDRR, | |
402 | stat.st_size - ohdr.fhdr.f_symptr - cbHDRR, | |
403 | "writing symbol table of %s", new_name); | |
404 | ||
6ca5cfd1 RS |
405 | #ifdef _REL_DYN |
406 | if (rel_dyn_section) | |
407 | update_dynamic_symbols (oldptr, new_name, new, nhdr.aout); | |
408 | #endif | |
b061d5f1 RS |
409 | |
410 | #undef symhdr | |
411 | ||
412 | SEEK (new, 0, "seeking to start of header in %s", new_name); | |
413 | WRITE (new, &nhdr, sizeof (nhdr), | |
414 | "writing header of %s", new_name); | |
415 | ||
416 | close (old); | |
417 | close (new); | |
418 | mark_x (new_name); | |
419 | } | |
420 | ||
421 | ||
b061d5f1 | 422 | |
d7b43eaa | 423 | update_dynamic_symbols (old, new_name, new, aout) |
866fc66a RS |
424 | char *old; /* Pointer to old executable */ |
425 | char *new_name; /* Name of new executable */ | |
426 | int new; /* File descriptor for new executable */ | |
d7b43eaa | 427 | struct aouthdr aout; /* a.out info from the file header */ |
b061d5f1 | 428 | { |
61e63089 | 429 | #if !defined (__linux__) && !defined (__NetBSD__) && !defined (__OpenBSD__) |
54dfb86c | 430 | |
d7b43eaa RS |
431 | typedef struct dynrel_info { |
432 | char * addr; | |
433 | unsigned type:8; | |
434 | unsigned index:24; | |
435 | unsigned info:8; | |
436 | unsigned pad:8; | |
437 | } dr_info; | |
438 | ||
439 | int nsyms = rel_dyn_section->s_size / sizeof (struct dynrel_info); | |
440 | int i; | |
441 | dr_info * rd_base = (dr_info *) (old + rel_dyn_section->s_scnptr); | |
442 | Elf32_Sym * ds_base = (Elf32_Sym *) (old + dynsym_section->s_scnptr); | |
b061d5f1 | 443 | |
d7b43eaa RS |
444 | for (i = 0; i < nsyms; i++) { |
445 | register Elf32_Sym x; | |
b061d5f1 | 446 | |
d7b43eaa RS |
447 | if (rd_base[i].index == 0) |
448 | continue; | |
b061d5f1 | 449 | |
d7b43eaa RS |
450 | x = ds_base[rd_base[i].index]; |
451 | ||
452 | #if 0 | |
453 | fprintf (stderr, "Object inspected: %s, addr = %lx, shndx = %x", | |
454 | old + dynstr_section->s_scnptr + x.st_name, rd_base[i].addr, x.st_shndx); | |
455 | #endif | |
456 | ||
457 | ||
458 | if ((ELF32_ST_BIND (x.st_info) == STB_GLOBAL) | |
459 | && (x.st_shndx == 0) | |
460 | /* && (x.st_value == NULL) */ | |
461 | ) { | |
462 | /* OK, this is probably a reference to an object in a shared | |
463 | library, so copy the old value. This is done in several steps: | |
464 | 1. reladdr is the address of the location in question relative to | |
465 | the start of the data section, | |
466 | 2. oldref is the addr is the mapped in temacs executable, | |
467 | 3. newref is the address of the location in question in the | |
468 | undumped executable, | |
469 | 4. len is the size of the object reference in bytes -- | |
470 | currently only 4 (long) and 8 (quad) are supported. | |
471 | */ | |
2881ec96 | 472 | register unsigned long reladdr = (long)rd_base[i].addr - old_data_scnhdr.s_vaddr; |
d7b43eaa RS |
473 | char * oldref = old + old_data_scnhdr.s_scnptr + reladdr; |
474 | unsigned long newref = aout.tsize + reladdr; | |
475 | int len; | |
476 | ||
477 | #if 0 | |
478 | fprintf (stderr, "...relocated\n"); | |
479 | #endif | |
480 | ||
481 | if (rd_base[i].type == R_REFLONG) | |
482 | len = 4; | |
483 | else if (rd_base[i].type == R_REFQUAD) | |
484 | len = 8; | |
485 | else | |
486 | fatal_unexec ("unrecognized relocation type in .dyn.rel section (symbol #%d)", i); | |
487 | ||
488 | SEEK (new, newref, "seeking to dynamic symbol in %s", new_name); | |
489 | WRITE (new, oldref, len, "writing old dynrel info in %s", new_name); | |
b061d5f1 RS |
490 | } |
491 | ||
d7b43eaa RS |
492 | #if 0 |
493 | else | |
494 | fprintf (stderr, "...not relocated\n"); | |
495 | #endif | |
496 | ||
497 | } | |
498 | ||
61e63089 | 499 | #endif /* not __linux__ and not __NetBSD__ and not __OpenBSD__ */ |
b061d5f1 RS |
500 | } |
501 | ||
b061d5f1 RS |
502 | \f |
503 | /* | |
504 | * mark_x | |
505 | * | |
506 | * After successfully building the new a.out, mark it executable | |
507 | */ | |
508 | ||
509 | static void | |
510 | mark_x (name) | |
511 | char *name; | |
512 | { | |
513 | struct stat sbuf; | |
514 | int um = umask (777); | |
515 | umask (um); | |
516 | if (stat (name, &sbuf) < 0) | |
517 | fatal_unexec ("getting protection on %s", name); | |
518 | sbuf.st_mode |= 0111 & ~um; | |
519 | if (chmod (name, sbuf.st_mode) < 0) | |
520 | fatal_unexec ("setting protection on %s", name); | |
521 | } | |
522 | ||
523 | static void | |
a084ed10 RS |
524 | fatal_unexec (s, arg) |
525 | char *s; | |
526 | char *arg; | |
b061d5f1 | 527 | { |
b061d5f1 RS |
528 | if (errno == EEOF) |
529 | fputs ("unexec: unexpected end of file, ", stderr); | |
530 | else | |
531 | fprintf (stderr, "unexec: %s, ", strerror (errno)); | |
a084ed10 | 532 | fprintf (stderr, s, arg); |
b061d5f1 RS |
533 | fputs (".\n", stderr); |
534 | exit (1); | |
535 | } |