arch.tproj/arch.c

   1 /*
   2  * Copyright (c) 1999-2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <sys/cdefs.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdbool.h>
  28 #include <stdlib.h>
  29 #include <stddef.h>
  30 #include <unistd.h>
  31 #include <spawn.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <sys/param.h>
  35 #include <paths.h>
  36 #include <err.h>
  37 #include <mach/mach.h>
  38 #include <mach-o/arch.h>
  39 #include <limits.h>
  40 #include <sys/fcntl.h>
  41 #include <glob.h>
  42 #include <CoreFoundation/CoreFoundation.h>
  43 #include <NSSystemDirectories.h>
  44 #include <sysdir.h>
  45
  46 #ifndef ARCH_PROG
  47 #define ARCH_PROG       "arch"
  48 #endif
  49 #ifndef MACHINE_PROG
  50 #define MACHINE_PROG    "machine"
  51 #endif
  52
  53 #define kKeyExecPath "ExecutablePath"
  54 #define kKeyPlistVersion "PropertyListVersion"
  55 #define kKeyPrefOrder "PreferredOrder"
  56 #define kPlistExtension ".plist"
  57 #define kSettingsDir "archSettings"
  58
  59 static const char envname[] = "ARCHPREFERENCE";
  60
  61 /* The CPU struct contains the argument buffer to posix_spawnattr_setbinpref_np */
  62
  63 typedef struct {
  64     cpu_type_t *buf;
  65     int errs;
  66     size_t count;
  67     size_t capacity;
  68 } CPU;
  69
  70 typedef struct {
  71     const char *arch;
  72     cpu_type_t cpu;
  73 } CPUTypes;
  74
  75 static const CPUTypes knownArchs[] = {
  76 #if defined(__i386__) || defined(__x86_64__)
  77     {"i386", CPU_TYPE_I386},
  78     {"x86_64", CPU_TYPE_X86_64},
  79 #elif defined(__arm__)
  80     {"arm", CPU_TYPE_ARM},
  81 #else
  82 #error "Unsupported architecture"
  83 #endif
  84 };
  85
  86 /* environment SPI */
  87 char **_copyenv(char **env);
  88 int _setenvp(const char *name, const char *value, int rewrite, char ***envp, void *state);
  89 int _unsetenvp(const char *name, char ***envp, void *state);
  90
  91 /* copy of environment */
  92 char **envCopy = NULL;
  93 extern char **environ;
  94
  95 /*
  96  * The native 32 and 64-bit architectures (this is relative to the architecture
  97  * the arch command is running.  NULL means unsupported.
  98  */
  99 #if defined(__i386__) || defined(__x86_64__)
 100 #define NATIVE_32       "i386"
 101 #define NATIVE_64       "x86_64"
 102 #elif defined(__arm__)
 103 #define NATIVE_32       "arm"
 104 #define NATIVE_64       NULL
 105 #else
 106 #error "Unsupported architecture"
 107 #endif
 108 bool unrecognizednative32seen = false;
 109 bool unrecognizednative64seen = false;
 110
 111 /*
 112  * arch - perform the original behavior of the arch and machine commands.
 113  * The archcmd flag is non-zero for the arch command, zero for the machine
 114  * command.  This routine never returns.
 115  */
 116 static void __dead2
 117 arch(int archcmd)
 118 {
 119     const NXArchInfo *arch = NXGetLocalArchInfo();
 120
 121     if(!arch)
 122         errx(-1, "Unknown architecture.");
 123     if(archcmd) {
 124         arch = NXGetArchInfoFromCpuType(arch->cputype, CPU_SUBTYPE_MULTIPLE);
 125         if(!arch)
 126             errx(-1, "Unknown architecture.");
 127     }
 128     printf("%s%s", arch->name, (isatty(STDIN_FILENO) ? "\n" : ""));
 129     exit(0);
 130 }
 131
 132 /*
 133  * spawnIt - run the posix_spawn command.  cpu is the auto-sizing CPU structure.
 134  * pflag is non-zero to call posix_spawnp; zero means to call posix_spawn.
 135  * str is the name/path to pass to posix_spawn{,p}, and argv are
 136  * the argument arrays to pass.  This routine never returns.
 137  */
 138 static void __dead2
 139 spawnIt(CPU *cpu, int pflag, const char *str, char **argv)
 140 {
 141     posix_spawnattr_t attr;
 142     pid_t pid;
 143     int ret;
 144     size_t copied;
 145     size_t count = cpu->count;
 146     cpu_type_t *prefs = cpu->buf;
 147
 148     if(count == 0) {
 149         if(unrecognizednative32seen)
 150             warnx("Unsupported native 32-bit architecture");
 151         if(unrecognizednative64seen)
 152             warnx("Unsupported native 64-bit architecture");
 153         exit(1);
 154     }
 155
 156     if(unrecognizednative32seen)
 157         fprintf(stderr, "warning: unsupported native 32-bit architecture\n");
 158     if(unrecognizednative64seen)
 159         fprintf(stderr, "warning: unsupported native 64-bit architecture\n");
 160
 161     if((ret = posix_spawnattr_init(&attr)) != 0)
 162         errc(1, ret, "posix_spawnattr_init");
 163     /* do the equivalent of exec, rather than creating a separate process */
 164     if((ret = posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETEXEC)) != 0)
 165         errc(1, ret, "posix_spawnattr_setflags");
 166     if((ret = posix_spawnattr_setbinpref_np(&attr, count, prefs, &copied)) != 0)
 167         errc(1, ret, "posix_spawnattr_setbinpref_np");
 168     if(copied != count)
 169         errx(1, "posix_spawnattr_setbinpref_np only copied %lu of %lu", copied, count);
 170     if(pflag)
 171         ret = posix_spawnp(&pid, str, NULL, &attr, argv, envCopy ? envCopy : environ);
 172     else
 173         ret = posix_spawn(&pid, str, NULL, &attr, argv, envCopy ? envCopy : environ);
 174     errc(1, ret, "posix_spawn%s: %s", (pflag ? "p" : ""), str);
 175 }
 176
 177 /*
 178  * initCPU - initialize a CPU structure, a dynamically expanding CPU types
 179  * array.
 180  */
 181 static void
 182 initCPU(CPU *cpu)
 183 {
 184     cpu->errs = 0;
 185     cpu->count = 0;
 186     cpu->capacity = 1;
 187     cpu->buf = (cpu_type_t *)malloc(cpu->capacity * sizeof(cpu_type_t));
 188     if(!cpu->buf)
 189         err(1, "Failed to malloc CPU buffer");
 190 }
 191
 192 /*
 193  * addCPU - add a new CPU type value to the CPU structure, expanding
 194  * the array as necessary.
 195  */
 196 static void
 197 addCPU(CPU *cpu, cpu_type_t n)
 198 {
 199     if(cpu->count == cpu->capacity) {
 200         cpu_type_t *newcpubuf;
 201
 202         cpu->capacity *= 2;
 203         newcpubuf = (cpu_type_t *)realloc(cpu->buf, cpu->capacity * sizeof(cpu_type_t));
 204         if(!newcpubuf)
 205             err(1, "Out of memory realloc-ing CPU structure");
 206         cpu->buf = newcpubuf;
 207     }
 208     cpu->buf[cpu->count++] = n;
 209 }
 210
 211 /*
 212  * addCPUbyname - add a new CPU type, given by name, to the CPU structure,
 213  * expanding the array as necessary.  The name is converted to a type value
 214  * by the ArchDict dictionary.
 215  */
 216 static void
 217 addCPUbyname(CPU *cpu, const char *name)
 218 {
 219     int i;
 220
 221     for (i=0; i < sizeof(knownArchs)/sizeof(knownArchs[0]); i++) {
 222         if (0 == strcasecmp(name, knownArchs[i].arch)) {
 223             addCPU(cpu, knownArchs[i].cpu);
 224             return;
 225         }
 226     }
 227
 228     /* Didn't match a string in knownArchs */
 229     warnx("Unknown architecture: %s", name);
 230     cpu->errs++;
 231 }
 232
 233 /*
 234  * useEnv - parse the environment variable for CPU preferences.  Use name
 235  * to look for program-specific preferences, and append any CPU types to cpu.
 236  * Returns the number of CPU types.  Returns any specified execute path in
 237  * execpath.
 238  *
 239  * The environment variable ARCHPREFERENCE has the format:
 240  *    spec[;spec]...
 241  * a semicolon separated list of specifiers.  Each specifier has the format:
 242  *    [prog:[execpath:]]type[,type]...
 243  * a comma separate list of CPU type names, optionally proceeded by a program
 244  * name and an execpath.  If program name exist, that types only apply to that
 245  * program.  If execpath is specified, it is returned.  If no program name
 246  * exists, then it applies to all programs.  So ordering of the specifiers is
 247  * important, as the default (no program name) specifier must be last.
 248  */
 249 static size_t
 250 useEnv(CPU *cpu, const char *name, char **execpath)
 251 {
 252     char *val = getenv(envname);
 253     if(!val)
 254         return 0;
 255
 256     /* cp will point to the basename of name */
 257     const char *cp = strrchr(name, '/');
 258     if(cp) {
 259         cp++;
 260         if(!*cp)
 261             errx(1, "%s: no name after last slash", name);
 262     } else
 263         cp = name;
 264     /* make a copy of the environment variable value, so we can modify it */
 265     val = strdup(val);
 266     if(!val)
 267         err(1, "Can't copy environment %s", envname);
 268     char *str = val;
 269     char *blk;
 270     /* for each specifier */
 271     while((blk = strsep(&str, ";")) != NULL) {
 272         if(*blk == 0)
 273             continue; /* two adjacent semicolons */
 274         /* now split on colons */
 275         char *n = strsep(&blk, ":");
 276         if(blk) {
 277             char *p = strsep(&blk, ":");
 278             if(!blk) { /* there is only one colon, so no execpath */
 279                 blk = p;
 280                 p = NULL;
 281             } else if(!*p) /* two consecutive colons, so no execpath */
 282                 p = NULL;
 283             if(!*blk)
 284                 continue; /* no cpu list, so skip */
 285             /* if the name matches, or there is no name, process the cpus */
 286             if(!*n || strcmp(n, cp) == 0) {
 287                 if(cpu->count == 0) { /* only if we haven't processed architectures */
 288                     char *t;
 289                     while((t = strsep(&blk, ",")) != NULL)
 290                         addCPUbyname(cpu, t);
 291                 }
 292                 *execpath = (*n ? p : NULL); /* only use the exec path is name is set */
 293                 break;
 294             }
 295         } else { /* no colons at all, so process as default */
 296             if(cpu->count == 0) { /* only if we haven't processed architectures */
 297                 blk = n;
 298                 while((n = strsep(&blk, ",")) != NULL)
 299                     addCPUbyname(cpu, n);
 300             }
 301             *execpath = NULL;
 302             break;
 303         }
 304     }
 305     if(cpu->errs) /* errors during addCPUbyname are fatal */
 306         exit(1);
 307     return cpu->count; /* return count of architectures */
 308 }
 309
 310 /*
 311  * spawnFromPreference - called when argv[0] is not "arch" or "machine", or
 312  * argv[0] was arch, but no commandline architectures were specified.
 313  * If the environment variable ARCHPREFERENCE is specified, and there is a
 314  * match to argv[0], use the specified cpu preferences.  If no exec path
 315  * is specified in ARCHPREFERENCE, or no match is found in ARCHPREFERENCE,
 316  * get any additional information from a .plist file with the name of argv[0].
 317  * This routine never returns.
 318  */
 319 static void __dead2
 320 spawnFromPreferences(CPU *cpu, int needexecpath, char **argv)
 321 {
 322     char *epath = NULL;
 323     char fpath[PATH_MAX];
 324     char execpath2[PATH_MAX];
 325     CFDictionaryRef plist = NULL;
 326     sysdir_search_path_enumeration_state state;
 327     size_t count, i;
 328     const char *prog = strrchr(*argv, '/');
 329
 330     if(prog)
 331         prog++;
 332     else
 333         prog = *argv;
 334     if(!*prog)
 335         errx(1, "Not program name specified");
 336
 337     /* check the environment variable first */
 338     if((count = useEnv(cpu, prog, &epath)) > 0) {
 339         /* if we were called as arch, use posix_spawnp */
 340         if(!needexecpath)
 341             spawnIt(cpu, 1, (epath ? epath : *argv), argv);
 342         /* otherwise, if we have the executable path, call posix_spawn */
 343         if(epath)
 344             spawnIt(cpu, 0, epath, argv);
 345     }
 346
 347     state = sysdir_start_search_path_enumeration(SYSDIR_DIRECTORY_LIBRARY, SYSDIR_DOMAIN_MASK_ALL);
 348     while ((state = sysdir_get_next_search_path_enumeration(state, fpath))) {
 349
 350         if (fpath[0] == '~') {
 351             glob_t pglob;
 352             int gret;
 353
 354             bzero(&pglob, sizeof(pglob));
 355
 356             gret = glob(fpath, GLOB_TILDE, NULL, &pglob);
 357             if (gret == 0) {
 358                 int i;
 359                 for (i=0; i < pglob.gl_pathc; i++) {
 360                     /* take the first glob expansion */
 361                     strlcpy(fpath, pglob.gl_pathv[i], sizeof(fpath));
 362                     break;
 363                 }
 364             }
 365             globfree(&pglob);
 366         }
 367
 368         // Handle path
 369         strlcat(fpath, "/" kSettingsDir "/", sizeof(fpath));
 370         strlcat(fpath, prog, sizeof(fpath));
 371         strlcat(fpath, kPlistExtension, sizeof(fpath));
 372         // printf("component: %s\n", fpath);
 373
 374         int fd, ret;
 375         size_t length;
 376         ssize_t rsize;
 377         struct stat sb;
 378         void *buffer;
 379         fd = open(fpath, O_RDONLY, 0);
 380         if (fd >= 0) {
 381             ret = fstat(fd, &sb);
 382             if (ret == 0) {
 383                 if (sb.st_size <= SIZE_T_MAX) {
 384                     length = (size_t)sb.st_size;
 385                     buffer = malloc(length); /* ownership transferred to CFData */
 386                     if (buffer) {
 387                         rsize = read(fd, buffer, length);
 388                         if (rsize == length) {
 389                             CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, buffer, length, kCFAllocatorMalloc);
 390                             if (data) {
 391                                 buffer = NULL;
 392                                 plist = CFPropertyListCreateWithData(kCFAllocatorDefault, data, kCFPropertyListImmutable, NULL, NULL);
 393                                 CFRelease(data);
 394                             }
 395                         }
 396                         if (buffer) {
 397                             free(buffer);
 398                         }
 399                     }
 400                 }
 401             }
 402             close(fd);
 403         }
 404
 405         if (plist) {
 406             break;
 407         }
 408     }
 409
 410     if (plist) {
 411         if (CFGetTypeID(plist) != CFDictionaryGetTypeID())
 412             errx(1, "%s: plist not a dictionary", fpath);
 413     } else {
 414         errx(1, "Can't find any plists for %s", prog);
 415     }
 416
 417     int errs = 0; /* scan for all errors and fail later */
 418     do { /* begin block */
 419         /* check the plist version */
 420         CFStringRef vers = CFDictionaryGetValue(plist, CFSTR(kKeyPlistVersion));
 421         if(!vers) {
 422             warnx("%s: No key %s", fpath, kKeyPlistVersion);
 423             errs++;
 424         } else if(CFGetTypeID(vers) != CFStringGetTypeID()) {
 425             warnx("%s: %s is not a string", fpath, kKeyPlistVersion);
 426             errs++;
 427         } else if(!CFEqual(vers, CFSTR("1.0"))) {
 428             warnx("%s: %s not 1.0", fpath, kKeyPlistVersion);
 429             errs++;
 430         }
 431         /* get the execpath */
 432         CFStringRef execpath = CFDictionaryGetValue(plist, CFSTR(kKeyExecPath));
 433         if(!execpath) {
 434             warnx("%s: No key %s", fpath, kKeyExecPath);
 435             errs++;
 436         } else if(CFGetTypeID(execpath) != CFStringGetTypeID()) {
 437             warnx("%s: %s is not a string", fpath, kKeyExecPath);
 438             errs++;
 439         }
 440         if (!CFStringGetFileSystemRepresentation(execpath, execpath2, sizeof(execpath2))) {
 441             warnx("%s: could not get exec path", fpath);
 442             errs++;
 443         }
 444         /* if we already got cpu preferences from ARCHPREFERENCE, we are done */
 445         if(count > 0)
 446             break;
 447         /* otherwise, parse the cpu preferences from the plist */
 448         CFArrayRef p = CFDictionaryGetValue(plist, CFSTR(kKeyPrefOrder));
 449         if(!p) {
 450             warnx("%s: No key %s", fpath, kKeyPrefOrder);
 451             errs++;
 452         } else if(CFGetTypeID(p) != CFArrayGetTypeID()) {
 453             warnx("%s: %s is not an array", fpath, kKeyPrefOrder);
 454             errs++;
 455         } else if((count = CFArrayGetCount(p)) == 0) {
 456             warnx("%s: no entries in %s", fpath, kKeyPrefOrder);
 457             errs++;
 458         } else {
 459             /* finally build the cpu type array */
 460             for(i = 0; i < count; i++) {
 461                 CFStringRef a = CFArrayGetValueAtIndex(p, i);
 462                 if(CFGetTypeID(a) != CFStringGetTypeID()) {
 463                     warnx("%s: entry %lu of %s is not a string", fpath, i, kKeyPrefOrder);
 464                     errs++;
 465                 } else {
 466                     char astr[128];
 467                     if (CFStringGetCString(a, astr, sizeof(astr), kCFStringEncodingASCII)) {
 468                         addCPUbyname(cpu, astr);
 469                     }
 470                 }
 471             }
 472         }
 473     } while(0); /* end block */
 474     if(errs) /* exit if there were any reported errors */
 475         exit(1);
 476
 477     CFRelease(plist);
 478
 479     /* call posix_spawn */
 480     spawnIt(cpu, 0, execpath2, argv);
 481 }
 482
 483 static void __dead2
 484 usage(int ret)
 485 {
 486     fprintf(stderr,
 487             "Usage: %s\n"
 488             "       Display the machine's architecture type\n"
 489             "Usage: %s {-arch_name | -arch arch_name} ... [-c] [-d envname] ... [-e envname=value] ... [-h] prog [arg ...]\n"
 490             "       Run prog with any arguments, using the given architecture\n"
 491             "       order.  If no architectures are specified, use the\n"
 492             "       ARCHPREFERENCE environment variable, or a property list file.\n"
 493             "       -c will clear out all environment variables before running prog.\n"
 494             "       -d will delete the given environment variable before running prog.\n"
 495             "       -e will add the given environment variable/value before running prog.\n"
 496             "       -h will print usage message and exit.\n",
 497             ARCH_PROG, ARCH_PROG);
 498     exit(ret);
 499 }
 500
 501 /*
 502  * wrapped - check the path to see if it is a link to /usr/bin/arch.
 503  */
 504 static int
 505 wrapped(const char *name)
 506 {
 507     size_t lp, ln;
 508     char *p;
 509     char *bp = NULL;
 510     char *cur, *path;
 511     char buf[MAXPATHLEN], rpbuf[MAXPATHLEN];
 512     struct stat sb;
 513
 514     ln = strlen(name);
 515
 516     do { /* begin block */
 517         /* If it's an absolute or relative path name, it's easy. */
 518         if(index(name, '/')) {
 519             if(stat(name, &sb) == 0 && S_ISREG(sb.st_mode) && access(name, X_OK) == 0) {
 520                 bp = (char *)name;
 521                 break;
 522             }
 523             errx(1, "%s isn't executable", name);
 524         }
 525
 526         /* search the PATH, looking for name */
 527         if((path = getenv("PATH")) == NULL)
 528             path = _PATH_DEFPATH;
 529
 530         cur = alloca(strlen(path) + 1);
 531         if(cur == NULL)
 532             err(1, "alloca");
 533         strcpy(cur, path);
 534         while((p = strsep(&cur, ":")) != NULL) {
 535             /*
 536              * It's a SHELL path -- double, leading and trailing colons
 537              * mean the current directory.
 538              */
 539             if(*p == '\0') {
 540                 p = ".";
 541                 lp = 1;
 542             } else
 543                 lp = strlen(p);
 544
 545             /*
 546              * If the path is too long complain.  This is a possible
 547              * security issue; given a way to make the path too long
 548              * the user may execute the wrong program.
 549              */
 550             if(lp + ln + 2 > sizeof(buf)) {
 551                 warn("%s: path too long", p);
 552                 continue;
 553             }
 554             bcopy(p, buf, lp);
 555             buf[lp] = '/';
 556             bcopy(name, buf + lp + 1, ln);
 557             buf[lp + ln + 1] = '\0';
 558             if(stat(buf, &sb) == 0 && S_ISREG(sb.st_mode) && access(buf, X_OK) == 0) {
 559                 bp = buf;
 560                 break;
 561             }
 562         }
 563         if(p == NULL)
 564             errx(1, "Can't find %s in PATH", name);
 565     } while(0); /* end block */
 566     if(realpath(bp, rpbuf) == NULL)
 567         errx(1, "realpath failed on %s", bp);
 568     return (strcmp(rpbuf, "/usr/bin/" ARCH_PROG) == 0);
 569 }
 570
 571 /*
 572  * spawnFromArgs - called when arch has arguments specified.  The arch command
 573  * line arguments are:
 574  * % arch [[{-xxx | -arch xxx}]...] prog [arg]...
 575  * where xxx is a cpu name, and the command to execute and its arguments follow.
 576  * If no commandline cpu names are given, the environment variable
 577  * ARCHPREFERENCE is used.  This routine never returns.
 578  */
 579
 580 #define MATCHARG(a,m)   ({ \
 581     const char *arg = *(a); \
 582     if(arg[1] == '-') arg++; \
 583     strcmp(arg, (m)) == 0; \
 584 })
 585
 586 #define MATCHARGWITHVALUE(a,m,n,e)      ({ \
 587     const char *ret = NULL; \
 588     const char *arg = *(a); \
 589     if(arg[1] == '-') arg++; \
 590     if(strcmp(arg, (m)) == 0) { \
 591         if(*++(a) == NULL) { \
 592             warnx(e); \
 593             usage(1); \
 594         } \
 595         ret = *(a); \
 596     } else if(strncmp(arg, (m), (n)) == 0 && arg[n] == '=') { \
 597          ret = arg + (n) + 1; \
 598     } \
 599     ret; \
 600 })
 601
 602 #define MAKEENVCOPY(e)  \
 603     if(!envCopy) { \
 604         envCopy = _copyenv(environ); \
 605         if(envCopy == NULL) \
 606             errx(1, (e)); \
 607     }
 608
 609 static void __dead2
 610 spawnFromArgs(CPU *cpu, char **argv)
 611 {
 612     const char *ap, *ret;
 613
 614     /* process arguments */
 615     for(argv++; *argv && **argv == '-'; argv++) {
 616         if((ret = MATCHARGWITHVALUE(argv, "-arch", 5, "-arch without architecture"))) {
 617             ap = ret;
 618         } else if(MATCHARG(argv, "-32")) {
 619             ap = NATIVE_32;
 620             if(!ap) {
 621                 unrecognizednative32seen = true;
 622                 continue;
 623             }
 624         } else if(MATCHARG(argv, "-64")) {
 625             ap = NATIVE_64;
 626             if(!ap) {
 627                 unrecognizednative64seen = true;
 628                 continue;
 629             }
 630         } else if(MATCHARG(argv, "-c")) {
 631             free(envCopy);
 632             envCopy = _copyenv(NULL); // create empty environment
 633             if(!envCopy)
 634                 errx(1, "Out of memory processing -c");
 635             continue;
 636         } else if((ret = MATCHARGWITHVALUE(argv, "-d", 2, "-d without envname"))) {
 637             MAKEENVCOPY("Out of memory processing -d");
 638             _unsetenvp(ret, &envCopy, NULL);
 639             continue;
 640         } else if((ret = MATCHARGWITHVALUE(argv, "-e", 2, "-e without envname=value"))) {
 641             MAKEENVCOPY("Out of memory processing -e");
 642             const char *cp = strchr(ret, '=');
 643             if(!cp) {
 644                 warnx("-e %s: no equal sign", ret);
 645                 usage(1);
 646             }
 647             cp++; // skip to value
 648             /*
 649              * _setenvp() only uses the name before any equal sign found in
 650              * the first argument.
 651              */
 652             _setenvp(ret, cp, 1, &envCopy, NULL);
 653             continue;
 654         } else if(MATCHARG(argv, "-h")) {
 655             usage(0);
 656         } else {
 657             ap = *argv + 1;
 658             if(*ap == '-') ap++;
 659         }
 660         addCPUbyname(cpu, ap);
 661     }
 662     if(cpu->errs)
 663         exit(1);
 664     if(!*argv || !**argv) {
 665         warnx("No command to execute");
 666         usage(1);
 667     }
 668     /* if the program is already a link to arch, then force execpath */
 669     int needexecpath = wrapped(*argv);
 670
 671     /*
 672      * If we don't have any architecutures, try ARCHPREFERENCE and plist
 673      * files.
 674      */
 675     if((cpu->count == 0) || needexecpath)
 676         spawnFromPreferences(cpu, needexecpath, argv); /* doesn't return */
 677
 678     /*
 679      * Call posix_spawnp on the program name.
 680      */
 681     spawnIt(cpu, 1, *argv, argv);
 682 }
 683
 684
 685 /* the main() routine */
 686 int
 687 main(int argc, char **argv)
 688 {
 689     const char *prog = getprogname();
 690     int my_name_is_arch;
 691     CPU cpu;
 692
 693     if(strcmp(prog, MACHINE_PROG) == 0) {
 694         if(argc > 1)
 695             errx(-1, "no arguments accepted");
 696         arch(0); /* the "machine" command was called */
 697     } else if((my_name_is_arch = (strcmp(prog, ARCH_PROG) == 0))) {
 698         if(argc == 1)
 699             arch(1); /* the "arch" command with no arguments was called */
 700     }
 701
 702     initCPU(&cpu);
 703
 704     if(my_name_is_arch)
 705         spawnFromArgs(&cpu, argv);
 706     else
 707         spawnFromPreferences(&cpu, 1, argv);
 708
 709     /* should never get here */
 710     errx(1, "returned from spawn");
 711 }