| 1 | /* Modified version of unexec for convex machines. |
| 2 | Note that the GNU project considers support for the peculiarities |
| 3 | of the Convex operating system a peripheral activity which should |
| 4 | not be allowed to divert effort from development of the GNU system. |
| 5 | Changes in this code will be installed when Convex system |
| 6 | maintainers send them in, but aside from that we don't plan to |
| 7 | think about it, or about whether other Emacs maintenance might |
| 8 | break it. |
| 9 | |
| 10 | Copyright (C) 1985, 1986, 1988, 2002, 2003, 2004, |
| 11 | 2005, 2006 Free Software Foundation, Inc. |
| 12 | |
| 13 | This file is part of GNU Emacs. |
| 14 | |
| 15 | GNU Emacs is free software; you can redistribute it and/or modify |
| 16 | it under the terms of the GNU General Public License as published by |
| 17 | the Free Software Foundation; either version 2, or (at your option) |
| 18 | any later version. |
| 19 | |
| 20 | GNU Emacs is distributed in the hope that it will be useful, |
| 21 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | GNU General Public License for more details. |
| 24 | |
| 25 | You should have received a copy of the GNU General Public License |
| 26 | along with GNU Emacs; see the file COPYING. If not, write to |
| 27 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 28 | Boston, MA 02110-1301, USA. */ |
| 29 | |
| 30 | |
| 31 | /* modified for C-1 arch by jthomp@convex 871103 */ |
| 32 | /* Corrected to support convex SOFF object file formats and thread specific |
| 33 | * regions. streepy@convex 890302 |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * unexec.c - Convert a running program into an a.out file. |
| 38 | * |
| 39 | * Author: Spencer W. Thomas |
| 40 | * Computer Science Dept. |
| 41 | * University of Utah |
| 42 | * Date: Tue Mar 2 1982 |
| 43 | * Modified heavily since then. |
| 44 | * |
| 45 | * Synopsis: |
| 46 | * unexec (new_name, a_name, data_start, bss_start, entry_address) |
| 47 | * char *new_name, *a_name; |
| 48 | * unsigned data_start, bss_start, entry_address; |
| 49 | * |
| 50 | * Takes a snapshot of the program and makes an a.out format file in the |
| 51 | * file named by the string argument new_name. |
| 52 | * If a_name is non-NULL, the symbol table will be taken from the given file. |
| 53 | * On some machines, an existing a_name file is required. |
| 54 | * |
| 55 | * The boundaries within the a.out file may be adjusted with the data_start |
| 56 | * and bss_start arguments. Either or both may be given as 0 for defaults. |
| 57 | * |
| 58 | * Data_start gives the boundary between the text segment and the data |
| 59 | * segment of the program. The text segment can contain shared, read-only |
| 60 | * program code and literal data, while the data segment is always unshared |
| 61 | * and unprotected. Data_start gives the lowest unprotected address. |
| 62 | * The value you specify may be rounded down to a suitable boundary |
| 63 | * as required by the machine you are using. |
| 64 | * |
| 65 | * Specifying zero for data_start means the boundary between text and data |
| 66 | * should not be the same as when the program was loaded. |
| 67 | * If NO_REMAP is defined, the argument data_start is ignored and the |
| 68 | * segment boundaries are never changed. |
| 69 | * |
| 70 | * Bss_start indicates how much of the data segment is to be saved in the |
| 71 | * a.out file and restored when the program is executed. It gives the lowest |
| 72 | * unsaved address, and is rounded up to a page boundary. The default when 0 |
| 73 | * is given assumes that the entire data segment is to be stored, including |
| 74 | * the previous data and bss as well as any additional storage allocated with |
| 75 | * break (2). |
| 76 | * |
| 77 | * The new file is set up to start at entry_address. |
| 78 | * |
| 79 | * If you make improvements I'd like to get them too. |
| 80 | * harpo!utah-cs!thomas, thomas@Utah-20 |
| 81 | * |
| 82 | */ |
| 83 | |
| 84 | /* There are several compilation parameters affecting unexec: |
| 85 | |
| 86 | * COFF |
| 87 | |
| 88 | Define this if your system uses COFF for executables. |
| 89 | Otherwise we assume you use Berkeley format. |
| 90 | |
| 91 | * NO_REMAP |
| 92 | |
| 93 | Define this if you do not want to try to save Emacs's pure data areas |
| 94 | as part of the text segment. |
| 95 | |
| 96 | Saving them as text is good because it allows users to share more. |
| 97 | |
| 98 | However, on machines that locate the text area far from the data area, |
| 99 | the boundary cannot feasibly be moved. Such machines require |
| 100 | NO_REMAP. |
| 101 | |
| 102 | Also, remapping can cause trouble with the built-in startup routine |
| 103 | /lib/crt0.o, which defines `environ' as an initialized variable. |
| 104 | Dumping `environ' as pure does not work! So, to use remapping, |
| 105 | you must write a startup routine for your machine in Emacs's crt0.c. |
| 106 | If NO_REMAP is defined, Emacs uses the system's crt0.o. |
| 107 | |
| 108 | * SECTION_ALIGNMENT |
| 109 | |
| 110 | Some machines that use COFF executables require that each section |
| 111 | start on a certain boundary *in the COFF file*. Such machines should |
| 112 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be |
| 113 | zero on such a boundary. This mask is used to control padding between |
| 114 | segments in the COFF file. |
| 115 | |
| 116 | If SECTION_ALIGNMENT is not defined, the segments are written |
| 117 | consecutively with no attempt at alignment. This is right for |
| 118 | unmodified system V. |
| 119 | |
| 120 | * SEGMENT_MASK |
| 121 | |
| 122 | Some machines require that the beginnings and ends of segments |
| 123 | *in core* be on certain boundaries. For most machines, a page |
| 124 | boundary is sufficient. That is the default. When a larger |
| 125 | boundary is needed, define SEGMENT_MASK to a mask of |
| 126 | the bits that must be zero on such a boundary. |
| 127 | |
| 128 | * A_TEXT_OFFSET(HDR) |
| 129 | |
| 130 | Some machines count the a.out header as part of the size of the text |
| 131 | segment (a_text); they may actually load the header into core as the |
| 132 | first data in the text segment. Some have additional padding between |
| 133 | the header and the real text of the program that is counted in a_text. |
| 134 | |
| 135 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header |
| 136 | structure HDR and return the number of bytes to add to `a_text' |
| 137 | before writing it (above and beyond the number of bytes of actual |
| 138 | program text). HDR's standard fields are already correct, except that |
| 139 | this adjustment to the `a_text' field has not yet been made; |
| 140 | thus, the amount of offset can depend on the data in the file. |
| 141 | |
| 142 | * A_TEXT_SEEK(HDR) |
| 143 | |
| 144 | If defined, this macro specifies the number of bytes to seek into the |
| 145 | a.out file before starting to write the text segment.a |
| 146 | |
| 147 | * EXEC_MAGIC |
| 148 | |
| 149 | For machines using COFF, this macro, if defined, is a value stored |
| 150 | into the magic number field of the output file. |
| 151 | |
| 152 | * ADJUST_EXEC_HEADER |
| 153 | |
| 154 | This macro can be used to generate statements to adjust or |
| 155 | initialize nonstandard fields in the file header |
| 156 | |
| 157 | * ADDR_CORRECT(ADDR) |
| 158 | |
| 159 | Macro to correct an int which is the bit pattern of a pointer to a byte |
| 160 | into an int which is the number of a byte. |
| 161 | |
| 162 | This macro has a default definition which is usually right. |
| 163 | This default definition is a no-op on most machines (where a |
| 164 | pointer looks like an int) but not on all machines. |
| 165 | |
| 166 | */ |
| 167 | |
| 168 | #include <config.h> |
| 169 | #define PERROR(file) report_error (file, new) |
| 170 | |
| 171 | #include <a.out.h> |
| 172 | /* Define getpagesize () if the system does not. |
| 173 | Note that this may depend on symbols defined in a.out.h |
| 174 | */ |
| 175 | #include "getpagesize.h" |
| 176 | |
| 177 | #include <sys/types.h> |
| 178 | #include <stdio.h> |
| 179 | #include <sys/stat.h> |
| 180 | #include <errno.h> |
| 181 | |
| 182 | extern char *start_of_text (); /* Start of text */ |
| 183 | extern char *start_of_data (); /* Start of initialized data */ |
| 184 | |
| 185 | #include <machine/filehdr.h> |
| 186 | #include <machine/opthdr.h> |
| 187 | #include <machine/scnhdr.h> |
| 188 | #include <machine/pte.h> |
| 189 | |
| 190 | static long block_copy_start; /* Old executable start point */ |
| 191 | static struct filehdr f_hdr; /* File header */ |
| 192 | static struct opthdr f_ohdr; /* Optional file header (a.out) */ |
| 193 | long bias; /* Bias to add for growth */ |
| 194 | #define SYMS_START block_copy_start |
| 195 | |
| 196 | static long text_scnptr; |
| 197 | static long data_scnptr; |
| 198 | |
| 199 | static int pagemask; |
| 200 | static int pagesz; |
| 201 | |
| 202 | static |
| 203 | report_error (file, fd) |
| 204 | char *file; |
| 205 | int fd; |
| 206 | { |
| 207 | if (fd) |
| 208 | close (fd); |
| 209 | error ("Failure operating on %s", file); |
| 210 | } |
| 211 | |
| 212 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
| 213 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 |
| 214 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 |
| 215 | |
| 216 | static |
| 217 | report_error_1 (fd, msg, a1, a2) |
| 218 | int fd; |
| 219 | char *msg; |
| 220 | int a1, a2; |
| 221 | { |
| 222 | close (fd); |
| 223 | error (msg, a1, a2); |
| 224 | } |
| 225 | \f |
| 226 | /* **************************************************************** |
| 227 | * unexec |
| 228 | * |
| 229 | * driving logic. |
| 230 | */ |
| 231 | unexec (new_name, a_name, data_start, bss_start, entry_address) |
| 232 | char *new_name, *a_name; |
| 233 | unsigned data_start, bss_start, entry_address; |
| 234 | { |
| 235 | int new, a_out = -1; |
| 236 | |
| 237 | if (a_name && (a_out = open (a_name, 0)) < 0) { |
| 238 | PERROR (a_name); |
| 239 | } |
| 240 | if ((new = creat (new_name, 0666)) < 0) { |
| 241 | PERROR (new_name); |
| 242 | } |
| 243 | |
| 244 | if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0 |
| 245 | || copy_text_and_data (new) < 0 |
| 246 | || copy_sym (new, a_out, a_name, new_name) < 0 ) { |
| 247 | close (new); |
| 248 | return -1; |
| 249 | } |
| 250 | |
| 251 | close (new); |
| 252 | if (a_out >= 0) |
| 253 | close (a_out); |
| 254 | mark_x (new_name); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* **************************************************************** |
| 259 | * make_hdr |
| 260 | * |
| 261 | * Make the header in the new a.out from the header in core. |
| 262 | * Modify the text and data sizes. |
| 263 | */ |
| 264 | |
| 265 | struct scnhdr *stbl; /* Table of all scnhdr's */ |
| 266 | struct scnhdr *f_thdr; /* Text section header */ |
| 267 | struct scnhdr *f_dhdr; /* Data section header */ |
| 268 | struct scnhdr *f_tdhdr; /* Thread Data section header */ |
| 269 | struct scnhdr *f_bhdr; /* Bss section header */ |
| 270 | struct scnhdr *f_tbhdr; /* Thread Bss section header */ |
| 271 | |
| 272 | static int |
| 273 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) |
| 274 | int new, a_out; |
| 275 | unsigned data_start, bss_start, entry_address; |
| 276 | char *a_name; |
| 277 | char *new_name; |
| 278 | { |
| 279 | register int scns; |
| 280 | unsigned int bss_end; |
| 281 | unsigned int eo_data; /* End of initialized data in new exec file */ |
| 282 | int scntype; /* Section type */ |
| 283 | int i; /* Var for sorting by vaddr */ |
| 284 | struct scnhdr scntemp; /* For swapping entries in sort */ |
| 285 | extern char *start_of_data(); |
| 286 | |
| 287 | pagemask = (pagesz = getpagesize()) - 1; |
| 288 | |
| 289 | /* Adjust text/data boundary. */ |
| 290 | if (!data_start) |
| 291 | data_start = (unsigned) start_of_data (); |
| 292 | |
| 293 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
| 294 | |
| 295 | bss_end = (sbrk(0) + pagemask) & ~pagemask; |
| 296 | |
| 297 | /* Adjust data/bss boundary. */ |
| 298 | if (bss_start != 0) { |
| 299 | bss_start = (bss_start + pagemask) & ~pagemask;/* (Up) to page bdry. */ |
| 300 | if (bss_start > bss_end) { |
| 301 | ERROR1 ("unexec: Specified bss_start (%x) is past end of program", |
| 302 | bss_start); |
| 303 | } |
| 304 | } else |
| 305 | bss_start = bss_end; |
| 306 | |
| 307 | if (data_start > bss_start) { /* Can't have negative data size. */ |
| 308 | ERROR2 ("unexec: data_start (%x) can't be greater than bss_start (%x)", |
| 309 | data_start, bss_start); |
| 310 | } |
| 311 | |
| 312 | /* Salvage as much info from the existing file as possible */ |
| 313 | if (a_out < 0) { |
| 314 | ERROR0 ("can't build a COFF file from scratch yet"); |
| 315 | /*NOTREACHED*/ |
| 316 | } |
| 317 | |
| 318 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) { |
| 319 | PERROR (a_name); |
| 320 | } |
| 321 | block_copy_start += sizeof (f_hdr); |
| 322 | if (f_hdr.h_opthdr > 0) { |
| 323 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) { |
| 324 | PERROR (a_name); |
| 325 | } |
| 326 | block_copy_start += sizeof (f_ohdr); |
| 327 | } |
| 328 | |
| 329 | /* Allocate room for scn headers */ |
| 330 | stbl = (struct scnhdr *)malloc( sizeof(struct scnhdr) * f_hdr.h_nscns ); |
| 331 | if( stbl == NULL ) { |
| 332 | ERROR0( "unexec: malloc of stbl failed" ); |
| 333 | } |
| 334 | |
| 335 | f_tdhdr = f_tbhdr = NULL; |
| 336 | |
| 337 | /* Loop through section headers, copying them in */ |
| 338 | for (scns = 0; scns < f_hdr.h_nscns; scns++) { |
| 339 | |
| 340 | if( read( a_out, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) { |
| 341 | PERROR (a_name); |
| 342 | } |
| 343 | |
| 344 | scntype = stbl[scns].s_flags & S_TYPMASK; /* What type of section */ |
| 345 | |
| 346 | if( stbl[scns].s_scnptr > 0L) { |
| 347 | if( block_copy_start < stbl[scns].s_scnptr + stbl[scns].s_size ) |
| 348 | block_copy_start = stbl[scns].s_scnptr + stbl[scns].s_size; |
| 349 | } |
| 350 | |
| 351 | if( scntype == S_TEXT) { |
| 352 | f_thdr = &stbl[scns]; |
| 353 | } else if( scntype == S_DATA) { |
| 354 | f_dhdr = &stbl[scns]; |
| 355 | #ifdef S_TDATA |
| 356 | } else if( scntype == S_TDATA ) { |
| 357 | f_tdhdr = &stbl[scns]; |
| 358 | } else if( scntype == S_TBSS ) { |
| 359 | f_tbhdr = &stbl[scns]; |
| 360 | #endif /* S_TDATA (thread stuff) */ |
| 361 | |
| 362 | } else if( scntype == S_BSS) { |
| 363 | f_bhdr = &stbl[scns]; |
| 364 | } |
| 365 | |
| 366 | } |
| 367 | |
| 368 | /* We will now convert TEXT and DATA into TEXT, BSS into DATA, and leave |
| 369 | * all thread stuff alone. |
| 370 | */ |
| 371 | |
| 372 | /* Now we alter the contents of all the f_*hdr variables |
| 373 | to correspond to what we want to dump. */ |
| 374 | |
| 375 | f_thdr->s_vaddr = (long) start_of_text (); |
| 376 | f_thdr->s_size = data_start - f_thdr->s_vaddr; |
| 377 | f_thdr->s_scnptr = pagesz; |
| 378 | f_thdr->s_relptr = 0; |
| 379 | f_thdr->s_nrel = 0; |
| 380 | |
| 381 | eo_data = f_thdr->s_scnptr + f_thdr->s_size; |
| 382 | |
| 383 | if( f_tdhdr ) { /* Process thread data */ |
| 384 | |
| 385 | f_tdhdr->s_vaddr = data_start; |
| 386 | f_tdhdr->s_size += f_dhdr->s_size - (data_start - f_dhdr->s_vaddr); |
| 387 | f_tdhdr->s_scnptr = eo_data; |
| 388 | f_tdhdr->s_relptr = 0; |
| 389 | f_tdhdr->s_nrel = 0; |
| 390 | |
| 391 | eo_data += f_tdhdr->s_size; |
| 392 | |
| 393 | /* And now for DATA */ |
| 394 | |
| 395 | f_dhdr->s_vaddr = f_bhdr->s_vaddr; /* Take BSS start address */ |
| 396 | f_dhdr->s_size = bss_end - f_bhdr->s_vaddr; |
| 397 | f_dhdr->s_scnptr = eo_data; |
| 398 | f_dhdr->s_relptr = 0; |
| 399 | f_dhdr->s_nrel = 0; |
| 400 | |
| 401 | eo_data += f_dhdr->s_size; |
| 402 | |
| 403 | } else { |
| 404 | |
| 405 | f_dhdr->s_vaddr = data_start; |
| 406 | f_dhdr->s_size = bss_start - data_start; |
| 407 | f_dhdr->s_scnptr = eo_data; |
| 408 | f_dhdr->s_relptr = 0; |
| 409 | f_dhdr->s_nrel = 0; |
| 410 | |
| 411 | eo_data += f_dhdr->s_size; |
| 412 | |
| 413 | } |
| 414 | |
| 415 | f_bhdr->s_vaddr = bss_start; |
| 416 | f_bhdr->s_size = bss_end - bss_start + pagesz /* fudge */; |
| 417 | f_bhdr->s_scnptr = 0; |
| 418 | f_bhdr->s_relptr = 0; |
| 419 | f_bhdr->s_nrel = 0; |
| 420 | |
| 421 | text_scnptr = f_thdr->s_scnptr; |
| 422 | data_scnptr = f_dhdr->s_scnptr; |
| 423 | bias = eo_data - block_copy_start; |
| 424 | |
| 425 | if (f_ohdr.o_symptr > 0L) { |
| 426 | f_ohdr.o_symptr += bias; |
| 427 | } |
| 428 | |
| 429 | if (f_hdr.h_strptr > 0) { |
| 430 | f_hdr.h_strptr += bias; |
| 431 | } |
| 432 | |
| 433 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) { |
| 434 | PERROR (new_name); |
| 435 | } |
| 436 | |
| 437 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) { |
| 438 | PERROR (new_name); |
| 439 | } |
| 440 | |
| 441 | for( scns = 0; scns < f_hdr.h_nscns; scns++ ) { |
| 442 | |
| 443 | /* This is a cheesy little loop to write out the section headers |
| 444 | * in order of increasing virtual address. Dull but effective. |
| 445 | */ |
| 446 | |
| 447 | for( i = scns+1; i < f_hdr.h_nscns; i++ ) { |
| 448 | if( stbl[i].s_vaddr < stbl[scns].s_vaddr ) { /* Swap */ |
| 449 | scntemp = stbl[i]; |
| 450 | stbl[i] = stbl[scns]; |
| 451 | stbl[scns] = scntemp; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | } |
| 456 | |
| 457 | for( scns = 0; scns < f_hdr.h_nscns; scns++ ) { |
| 458 | |
| 459 | if( write( new, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) { |
| 460 | PERROR (new_name); |
| 461 | } |
| 462 | |
| 463 | } |
| 464 | |
| 465 | return (0); |
| 466 | |
| 467 | } |
| 468 | \f |
| 469 | /* **************************************************************** |
| 470 | * copy_text_and_data |
| 471 | * |
| 472 | * Copy the text and data segments from memory to the new a.out |
| 473 | */ |
| 474 | static int |
| 475 | copy_text_and_data (new) |
| 476 | int new; |
| 477 | { |
| 478 | register int scns; |
| 479 | |
| 480 | for( scns = 0; scns < f_hdr.h_nscns; scns++ ) |
| 481 | write_segment( new, &stbl[scns] ); |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | write_segment( new, sptr ) |
| 487 | int new; |
| 488 | struct scnhdr *sptr; |
| 489 | { |
| 490 | register char *ptr, *end; |
| 491 | register int nwrite, ret; |
| 492 | char buf[80]; |
| 493 | extern int errno; |
| 494 | char zeros[128]; |
| 495 | |
| 496 | if( sptr->s_scnptr == 0 ) |
| 497 | return; /* Nothing to do */ |
| 498 | |
| 499 | if( lseek( new, (long) sptr->s_scnptr, 0 ) == -1 ) |
| 500 | PERROR( "unexecing" ); |
| 501 | |
| 502 | bzero (zeros, sizeof zeros); |
| 503 | |
| 504 | ptr = (char *) sptr->s_vaddr; |
| 505 | end = ptr + sptr->s_size; |
| 506 | |
| 507 | while( ptr < end ) { |
| 508 | |
| 509 | /* distance to next multiple of 128. */ |
| 510 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; |
| 511 | /* But not beyond specified end. */ |
| 512 | if (nwrite > end - ptr) nwrite = end - ptr; |
| 513 | ret = write (new, ptr, nwrite); |
| 514 | /* If write gets a page fault, it means we reached |
| 515 | a gap between the old text segment and the old data segment. |
| 516 | This gap has probably been remapped into part of the text segment. |
| 517 | So write zeros for it. */ |
| 518 | if (ret == -1 && errno == EFAULT) |
| 519 | write (new, zeros, nwrite); |
| 520 | else if (nwrite != ret) { |
| 521 | sprintf (buf, |
| 522 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
| 523 | ptr, new, nwrite, ret, errno); |
| 524 | PERROR (buf); |
| 525 | } |
| 526 | ptr += nwrite; |
| 527 | } |
| 528 | } |
| 529 | \f |
| 530 | /* **************************************************************** |
| 531 | * copy_sym |
| 532 | * |
| 533 | * Copy the relocation information and symbol table from the a.out to the new |
| 534 | */ |
| 535 | static int |
| 536 | copy_sym (new, a_out, a_name, new_name) |
| 537 | int new, a_out; |
| 538 | char *a_name, *new_name; |
| 539 | { |
| 540 | char page[1024]; |
| 541 | int n; |
| 542 | |
| 543 | if (a_out < 0) |
| 544 | return 0; |
| 545 | |
| 546 | if (SYMS_START == 0L) |
| 547 | return 0; |
| 548 | |
| 549 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ |
| 550 | lseek( new, (long)f_ohdr.o_symptr, 0 ); |
| 551 | |
| 552 | while ((n = read (a_out, page, sizeof page)) > 0) { |
| 553 | if (write (new, page, n) != n) { |
| 554 | PERROR (new_name); |
| 555 | } |
| 556 | } |
| 557 | if (n < 0) { |
| 558 | PERROR (a_name); |
| 559 | } |
| 560 | return 0; |
| 561 | } |
| 562 | \f |
| 563 | /* **************************************************************** |
| 564 | * mark_x |
| 565 | * |
| 566 | * After successfully building the new a.out, mark it executable |
| 567 | */ |
| 568 | static |
| 569 | mark_x (name) |
| 570 | char *name; |
| 571 | { |
| 572 | struct stat sbuf; |
| 573 | int um; |
| 574 | int new = 0; /* for PERROR */ |
| 575 | |
| 576 | um = umask (777); |
| 577 | umask (um); |
| 578 | if (stat (name, &sbuf) == -1) { |
| 579 | PERROR (name); |
| 580 | } |
| 581 | sbuf.st_mode |= 0111 & ~um; |
| 582 | if (chmod (name, sbuf.st_mode) == -1) |
| 583 | PERROR (name); |
| 584 | } |
| 585 | \f |
| 586 | /* Find the first pty letter. This is usually 'p', as in ptyp0, but |
| 587 | is sometimes configured down to 'm', 'n', or 'o' for some reason. */ |
| 588 | |
| 589 | first_pty_letter () |
| 590 | { |
| 591 | struct stat buf; |
| 592 | char pty_name[16]; |
| 593 | char c; |
| 594 | |
| 595 | for (c = 'o'; c >= 'a'; c--) |
| 596 | { |
| 597 | sprintf (pty_name, "/dev/pty%c0", c); |
| 598 | if (stat (pty_name, &buf) < 0) |
| 599 | return c + 1; |
| 600 | } |
| 601 | return 'a'; |
| 602 | } |
| 603 | |
| 604 | /* arch-tag: 8199e06d-69b5-4f79-84d8-00f6ea929af9 |
| 605 | (do not change this comment) */ |