system_cmds-597.1.1/arch.tproj/arch.c

   1 /*
   2  * Copyright (c) 1999, 2006, 2011 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
  45 #ifndef ARCH_PROG
  46 #define ARCH_PROG       "arch"
  47 #endif
  48 #ifndef MACHINE_PROG
  49 #define MACHINE_PROG    "machine"
  50 #endif
  51
  52 #define kKeyExecPath "ExecutablePath"
  53 #define kKeyPlistVersion "PropertyListVersion"
  54 #define kKeyPrefOrder "PreferredOrder"
  55 #define kPlistExtension ".plist"
  56 #define kSettingsDir "archSettings"
  57
  58 static const char envname[] = "ARCHPREFERENCE";
  59
  60 /* The CPU struct contains the argument buffer to posix_spawnattr_setbinpref_np */
  61
  62 typedef struct {
  63     cpu_type_t *buf;
  64     int errs;
  65     size_t count;
  66     size_t capacity;
  67 } CPU;
  68
  69 typedef struct {
  70     const char *arch;
  71     cpu_type_t cpu;
  72 } CPUTypes;
  73
  74 static const CPUTypes knownArchs[] = {
  75 #if defined(__i386__) || defined(__x86_64__)
  76     {"i386", CPU_TYPE_I386},
  77     {"x86_64", CPU_TYPE_X86_64},
  78 #elif defined(__arm__)
  79     {"arm", CPU_TYPE_ARM},
  80 #else
  81 #error "Unsupported architecture"
  82 #endif
  83 };
  84
  85 /* environment SPI */
  86 char **_copyenv(char **env);
  87 int _setenvp(const char *name, const char *value, int rewrite, char ***envp, void *state);
  88 int _unsetenvp(const char *name, char ***envp, void *state);
  89
  90 /* copy of environment */
  91 char **envCopy = NULL;
  92 extern char **environ;
  93
  94 /*
  95  * The native 32 and 64-bit architectures (this is relative to the architecture
  96  * the arch command is running.  NULL means unsupported.
  97  */
  98 #if defined(__i386__) || defined(__x86_64__)
  99 #define NATIVE_32       "i386"
 100 #define NATIVE_64       "x86_64"
 101 #elif defined(__arm__)
 102 #define NATIVE_32       "arm"
 103 #define NATIVE_64       NULL
 104 #else
 105 #error "Unsupported architecture"
 106 #endif
 107 bool unrecognizednative32seen = false;
 108 bool unrecognizednative64seen = false;
 109
 110 /*
 111  * arch - perform the original behavior of the arch and machine commands.
 112  * The archcmd flag is non-zero for the arch command, zero for the machine
 113  * command.  This routine never returns.
 114  */
 115 static void __dead2
 116 arch(int archcmd)
 117 {
 118     const NXArchInfo *arch = NXGetLocalArchInfo();
 119
 120     if(!arch)
 121         errx(-1, "Unknown architecture.");
 122     if(archcmd) {
 123         arch = NXGetArchInfoFromCpuType(arch->cputype, CPU_SUBTYPE_MULTIPLE);
 124         if(!arch)
 125             errx(-1, "Unknown architecture.");
 126     }
 127     printf("%s%s", arch->name, (isatty(STDIN_FILENO) ? "\n" : ""));
 128     exit(0);
 129 }
 130
 131 /*
 132  * spawnIt - run the posix_spawn command.  cpu is the auto-sizing CPU structure.
 133  * pflag is non-zero to call posix_spawnp; zero means to call posix_spawn.
 134  * str is the name/path to pass to posix_spawn{,p}, and argv are
 135  * the argument arrays to pass.  This routine never returns.
 136  */
 137 static void __dead2
 138 spawnIt(CPU *cpu, int pflag, const char *str, char **argv)
 139 {
 140     posix_spawnattr_t attr;
 141     pid_t pid;
 142     int ret;
 143     size_t copied;
 144     size_t count = cpu->count;
 145     cpu_type_t *prefs = cpu->buf;
 146
 147     if(count == 0) {
 148         if(unrecognizednative32seen)
 149             warnx("Unsupported native 32-bit architecture");
 150         if(unrecognizednative64seen)
 151             warnx("Unsupported native 64-bit architecture");
 152         exit(1);
 153     }
 154
 155     if(unrecognizednative32seen)
 156         fprintf(stderr, "warning: unsupported native 32-bit architecture\n");
 157     if(unrecognizednative64seen)
 158         fprintf(stderr, "warning: unsupported native 64-bit architecture\n");
 159
 160     if((ret = posix_spawnattr_init(&attr)) != 0)
 161         errc(1, ret, "posix_spawnattr_init");
 162     /* do the equivalent of exec, rather than creating a separate process */
 163     if((ret = posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETEXEC)) != 0)
 164         errc(1, ret, "posix_spawnattr_setflags");
 165     if((ret = posix_spawnattr_setbinpref_np(&attr, count, prefs, &copied)) != 0)
 166         errc(1, ret, "posix_spawnattr_setbinpref_np");
 167     if(copied != count)
 168         errx(1, "posix_spawnattr_setbinpref_np only copied %lu of %lu", copied, count);
 169     if(pflag)
 170         ret = posix_spawnp(&pid, str, NULL, &attr, argv, envCopy ? envCopy : environ);
 171     else
 172         ret = posix_spawn(&pid, str, NULL, &attr, argv, envCopy ? envCopy : environ);
 173     errc(1, ret, "posix_spawn%s: %s", (pflag ? "p" : ""), str);
 174 }
 175
 176 /*
 177  * initCPU - initialize a CPU structure, a dynamically expanding CPU types
 178  * array.
 179  */
 180 static void
 181 initCPU(CPU *cpu)
 182 {
 183     cpu->errs = 0;
 184     cpu->count = 0;
 185     cpu->capacity = 1;
 186     cpu->buf = (cpu_type_t *)malloc(cpu->capacity * sizeof(cpu_type_t));
 187     if(!cpu->buf)
 188         err(1, "Failed to malloc CPU buffer");
 189 }
 190
 191 /*
 192  * addCPU - add a new CPU type value to the CPU structure, expanding
 193  * the array as necessary.
 194  */
 195 static void
 196 addCPU(CPU *cpu, cpu_type_t n)
 197 {
 198     if(cpu->count == cpu->capacity) {
 199         cpu_type_t *newcpubuf;
 200
 201         cpu->capacity *= 2;
 202         newcpubuf = (cpu_type_t *)realloc(cpu->buf, cpu->capacity * sizeof(cpu_type_t));
 203         if(!newcpubuf)
 204             err(1, "Out of memory realloc-ing CPU structure");
 205         cpu->buf = newcpubuf;
 206     }
 207     cpu->buf[cpu->count++] = n;
 208 }
 209
 210 /*
 211  * addCPUbyname - add a new CPU type, given by name, to the CPU structure,
 212  * expanding the array as necessary.  The name is converted to a type value
 213  * by the ArchDict dictionary.
 214  */
 215 static void
 216 addCPUbyname(CPU *cpu, const char *name)
 217 {
 218     int i;
 219
 220     for (i=0; i < sizeof(knownArchs)/sizeof(knownArchs[0]); i++) {
 221         if (0 == strcasecmp(name, knownArchs[i].arch)) {
 222             addCPU(cpu, knownArchs[i].cpu);
 223             return;
 224         }
 225     }
 226
 227     /* Didn't match a string in knownArchs */
 228     warnx("Unknown architecture: %s", name);
 229     cpu->errs++;
 230 }
 231
 232 /*
 233  * useEnv - parse the environment variable for CPU preferences.  Use name
 234  * to look for program-specific preferences, and append any CPU types to cpu.
 235  * Returns the number of CPU types.  Returns any specified execute path in
 236  * execpath.
 237  *
 238  * The environment variable ARCHPREFERENCE has the format:
 239  *    spec[;spec]...
 240  * a semicolon separated list of specifiers.  Each specifier has the format:
 241  *    [prog:[execpath:]]type[,type]...
 242  * a comma separate list of CPU type names, optionally proceeded by a program
 243  * name and an execpath.  If program name exist, that types only apply to that
 244  * program.  If execpath is specified, it is returned.  If no program name
 245  * exists, then it applies to all programs.  So ordering of the specifiers is
 246  * important, as the default (no program name) specifier must be last.
 247  */
 248 static size_t
 249 useEnv(CPU *cpu, const char *name, char **execpath)
 250 {
 251     char *val = getenv(envname);
 252     if(!val)
 253         return 0;
 254
 255     /* cp will point to the basename of name */
 256     const char *cp = strrchr(name, '/');
 257     if(cp) {
 258         cp++;
 259         if(!*cp)
 260             errx(1, "%s: no name after last slash", name);
 261     } else
 262         cp = name;
 263     /* make a copy of the environment variable value, so we can modify it */
 264     val = strdup(val);
 265     if(!val)
 266         err(1, "Can't copy environment %s", envname);
 267     char *str = val;
 268     char *blk;
 269     /* for each specifier */
 270     while((blk = strsep(&str, ";")) != NULL) {
 271         if(*blk == 0)
 272             continue; /* two adjacent semicolons */
 273         /* now split on colons */
 274         char *n = strsep(&blk, ":");
 275         if(blk) {
 276             char *p = strsep(&blk, ":");
 277             if(!blk) { /* there is only one colon, so no execpath */
 278                 blk = p;
 279                 p = NULL;
 280             } else if(!*p) /* two consecutive colons, so no execpath */
 281                 p = NULL;
 282             if(!*blk)
 283                 continue; /* no cpu list, so skip */
 284             /* if the name matches, or there is no name, process the cpus */
 285             if(!*n || strcmp(n, cp) == 0) {
 286                 if(cpu->count == 0) { /* only if we haven't processed architectures */
 287                     char *t;
 288                     while((t = strsep(&blk, ",")) != NULL)
 289                         addCPUbyname(cpu, t);
 290                 }
 291                 *execpath = (*n ? p : NULL); /* only use the exec path is name is set */
 292                 break;
 293             }
 294         } else { /* no colons at all, so process as default */
 295             if(cpu->count == 0) { /* only if we haven't processed architectures */
 296                 blk = n;
 297                 while((n = strsep(&blk, ",")) != NULL)
 298                     addCPUbyname(cpu, n);
 299             }
 300             *execpath = NULL;
 301             break;
 302         }
 303     }
 304     if(cpu->errs) /* errors during addCPUbyname are fatal */
 305         exit(1);
 306     return cpu->count; /* return count of architectures */
 307 }
 308
 309 /*
 310  * spawnFromPreference - called when argv[0] is not "arch" or "machine", or
 311  * argv[0] was arch, but no commandline architectures were specified.
 312  * If the environment variable ARCHPREFERENCE is specified, and there is a
 313  * match to argv[0], use the specified cpu preferences.  If no exec path
 314  * is specified in ARCHPREFERENCE, or no match is found in ARCHPREFERENCE,
 315  * get any additional information from a .plist file with the name of argv[0].
 316  * This routine never returns.
 317  */
 318 static void __dead2
 319 spawnFromPreferences(CPU *cpu, int needexecpath, char **argv)
 320 {
 321     char *epath = NULL;
 322     char fpath[PATH_MAX];
 323     char execpath2[PATH_MAX];
 324     CFDictionaryRef plist = NULL;
 325     NSSearchPathEnumerationState state;
 326     size_t count, i;
 327     const char *prog = strrchr(*argv, '/');
 328
 329     if(prog)
 330         prog++;
 331     else
 332         prog = *argv;
 333     if(!*prog)
 334         errx(1, "Not program name specified");
 335
 336     /* check the environment variable first */
 337     if((count = useEnv(cpu, prog, &epath)) > 0) {
 338         /* if we were called as arch, use posix_spawnp */
 339         if(!needexecpath)
 340             spawnIt(cpu, 1, (epath ? epath : *argv), argv);
 341         /* otherwise, if we have the executable path, call posix_spawn */
 342         if(epath)
 343             spawnIt(cpu, 0, epath, argv);
 344     }
 345
 346     state = NSStartSearchPathEnumeration(NSLibraryDirectory, NSAllDomainsMask);
 347     while ((state = NSGetNextSearchPathEnumeration(state, fpath))) {
 348
 349         CFURLRef url;
 350         CFReadStreamRef stream;
 351
 352         if (fpath[0] == '~') {
 353             glob_t pglob;
 354             int gret;
 355
 356             bzero(&pglob, sizeof(pglob));
 357
 358             gret = glob(fpath, GLOB_TILDE, NULL, &pglob);
 359             if (gret == 0) {
 360                 int i;
 361                 for (i=0; i < pglob.gl_pathc; i++) {
 362                     /* take the first glob expansion */
 363                     strlcpy(fpath, pglob.gl_pathv[i], sizeof(fpath));
 364                     break;
 365                 }
 366             }
 367             globfree(&pglob);
 368         }
 369
 370         // Handle path
 371         strlcat(fpath, "/" kSettingsDir "/", sizeof(fpath));
 372         strlcat(fpath, prog, sizeof(fpath));
 373         strlcat(fpath, kPlistExtension, sizeof(fpath));
 374         // printf("component: %s\n", fpath);
 375
 376         int fd, ret;
 377         size_t length;
 378         ssize_t rsize;
 379         struct stat sb;
 380         void *buffer;
 381         fd = open(fpath, O_RDONLY, 0);
 382         if (fd >= 0) {
 383             ret = fstat(fd, &sb);
 384             if (ret == 0) {
 385                 if (sb.st_size <= SIZE_T_MAX) {
 386                     length = (size_t)sb.st_size;
 387                     buffer = malloc(length); /* ownership transferred to CFData */
 388                     if (buffer) {
 389                         rsize = read(fd, buffer, length);
 390                         if (rsize == length) {
 391                             CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, buffer, length, kCFAllocatorMalloc);
 392                             if (data) {
 393                                 buffer = NULL;
 394                                 plist = CFPropertyListCreateWithData(kCFAllocatorDefault, data, kCFPropertyListImmutable, NULL, NULL);
 395                                 CFRelease(data);
 396                             }
 397                         }
 398                         if (buffer) {
 399                             free(buffer);
 400                         }
 401                     }
 402                 }
 403             }
 404             close(fd);
 405         }
 406
 407         if (plist) {
 408             break;
 409         }
 410     }
 411
 412     if (plist) {
 413         if (CFGetTypeID(plist) != CFDictionaryGetTypeID())
 414             errx(1, "%s: plist not a dictionary", fpath);
 415     } else {
 416         errx(1, "Can't find any plists for %s", prog);
 417     }
 418
 419
 420     int errs = 0; /* scan for all errors and fail later */
 421     do { /* begin block */
 422         /* check the plist version */
 423         CFStringRef vers = CFDictionaryGetValue(plist, CFSTR(kKeyPlistVersion));
 424         if(!vers) {
 425             warnx("%s: No key %s", fpath, kKeyPlistVersion);
 426             errs++;
 427         } else if(CFGetTypeID(vers) != CFStringGetTypeID()) {
 428             warnx("%s: %s is not a string", fpath, kKeyPlistVersion);
 429             errs++;
 430         } else if(!CFEqual(vers, CFSTR("1.0"))) {
 431             warnx("%s: %s not 1.0", fpath, kKeyPlistVersion);
 432             errs++;
 433         }
 434         /* get the execpath */
 435         CFStringRef execpath = CFDictionaryGetValue(plist, CFSTR(kKeyExecPath));
 436         if(!execpath) {
 437             warnx("%s: No key %s", fpath, kKeyExecPath);
 438             errs++;
 439         } else if(CFGetTypeID(execpath) != CFStringGetTypeID()) {
 440             warnx("%s: %s is not a string", fpath, kKeyExecPath);
 441             errs++;
 442         }
 443         if (!CFStringGetFileSystemRepresentation(execpath, execpath2, sizeof(execpath2))) {
 444             warnx("%s: could not get exec path", fpath);
 445             errs++;
 446         }
 447         /* if we already got cpu preferences from ARCHPREFERENCE, we are done */
 448         if(count > 0)
 449             break;
 450         /* otherwise, parse the cpu preferences from the plist */
 451         CFArrayRef p = CFDictionaryGetValue(plist, CFSTR(kKeyPrefOrder));
 452         if(!p) {
 453             warnx("%s: No key %s", fpath, kKeyPrefOrder);
 454             errs++;
 455         } else if(CFGetTypeID(p) != CFArrayGetTypeID()) {
 456             warnx("%s: %s is not an array", fpath, kKeyPrefOrder);
 457             errs++;
 458         } else if((count = CFArrayGetCount(p)) == 0) {
 459             warnx("%s: no entries in %s", fpath, kKeyPrefOrder);
 460             errs++;
 461         } else {
 462             /* finally build the cpu type array */
 463             for(i = 0; i < count; i++) {
 464                 CFStringRef a = CFArrayGetValueAtIndex(p, i);
 465                 if(CFGetTypeID(a) != CFStringGetTypeID()) {
 466                     warnx("%s: entry %lu of %s is not a string", fpath, i, kKeyPrefOrder);
 467                     errs++;
 468                 } else {
 469                     char astr[128];
 470                     if (CFStringGetCString(a, astr, sizeof(astr), kCFStringEncodingASCII)) {
 471                         addCPUbyname(cpu, astr);
 472                     }
 473                 }
 474             }
 475         }
 476     } while(0); /* end block */
 477     if(errs) /* exit if there were any reported errors */
 478         exit(1);
 479
 480     CFRelease(plist);
 481
 482     /* call posix_spawn */
 483     spawnIt(cpu, 0, execpath2, argv);
 484 }
 485
 486 static void __dead2
 487 usage(int ret)
 488 {
 489     fprintf(stderr,
 490             "Usage: %s\n"
 491             "       Display the machine's architecture type\n"
 492             "Usage: %s {-arch_name | -arch arch_name} ... [-c] [-d envname] ... [-e envname=value] ... [-h] prog [arg ...]\n"
 493             "       Run prog with any arguments, using the given architecture\n"
 494             "       order.  If no architectures are specified, use the\n"
 495             "       ARCHPREFERENCE environment variable, or a property list file.\n"
 496             "       -c will clear out all environment variables before running prog.\n"
 497             "       -d will delete the given environment variable before running prog.\n"
 498             "       -e will add the given environment variable/value before running prog.\n"
 499             "       -h will print usage message and exit.\n",
 500             ARCH_PROG, ARCH_PROG);
 501     exit(ret);
 502 }
 503
 504 /*
 505  * wrapped - check the path to see if it is a link to /usr/bin/arch.
 506  */
 507 static int
 508 wrapped(const char *name)
 509 {
 510     size_t lp, ln;
 511     char *p;
 512     char *bp = NULL;
 513     char *cur, *path;
 514     char buf[MAXPATHLEN], rpbuf[MAXPATHLEN];
 515     struct stat sb;
 516
 517     ln = strlen(name);
 518
 519     do { /* begin block */
 520         /* If it's an absolute or relative path name, it's easy. */
 521         if(index(name, '/')) {
 522             if(stat(name, &sb) == 0 && S_ISREG(sb.st_mode) && access(name, X_OK) == 0) {
 523                 bp = (char *)name;
 524                 break;
 525             }
 526             errx(1, "%s isn't executable", name);
 527         }
 528
 529         /* search the PATH, looking for name */
 530         if((path = getenv("PATH")) == NULL)
 531             path = _PATH_DEFPATH;
 532
 533         cur = alloca(strlen(path) + 1);
 534         if(cur == NULL)
 535             err(1, "alloca");
 536         strcpy(cur, path);
 537         while((p = strsep(&cur, ":")) != NULL) {
 538             /*
 539              * It's a SHELL path -- double, leading and trailing colons
 540              * mean the current directory.
 541              */
 542             if(*p == '\0') {
 543                 p = ".";
 544                 lp = 1;
 545             } else
 546                 lp = strlen(p);
 547
 548             /*
 549              * If the path is too long complain.  This is a possible
 550              * security issue; given a way to make the path too long
 551              * the user may execute the wrong program.
 552              */
 553             if(lp + ln + 2 > sizeof(buf)) {
 554                 warn("%s: path too long", p);
 555                 continue;
 556             }
 557             bcopy(p, buf, lp);
 558             buf[lp] = '/';
 559             bcopy(name, buf + lp + 1, ln);
 560             buf[lp + ln + 1] = '\0';
 561             if(stat(buf, &sb) == 0 && S_ISREG(sb.st_mode) && access(buf, X_OK) == 0) {
 562                 bp = buf;
 563                 break;
 564             }
 565         }
 566         if(p == NULL)
 567             errx(1, "Can't find %s in PATH", name);
 568     } while(0); /* end block */
 569     if(realpath(bp, rpbuf) == NULL)
 570         errx(1, "realpath failed on %s", bp);
 571     return (strcmp(rpbuf, "/usr/bin/" ARCH_PROG) == 0);
 572 }
 573
 574 /*
 575  * spawnFromArgs - called when arch has arguments specified.  The arch command
 576  * line arguments are:
 577  * % arch [[{-xxx | -arch xxx}]...] prog [arg]...
 578  * where xxx is a cpu name, and the command to execute and its arguments follow.
 579  * If no commandline cpu names are given, the environment variable
 580  * ARCHPREFERENCE is used.  This routine never returns.
 581  */
 582
 583 #define MATCHARG(a,m)   ({ \
 584     const char *arg = *(a); \
 585     if(arg[1] == '-') arg++; \
 586     strcmp(arg, (m)) == 0; \
 587 })
 588
 589 #define MATCHARGWITHVALUE(a,m,n,e)      ({ \
 590     const char *ret = NULL; \
 591     const char *arg = *(a); \
 592     if(arg[1] == '-') arg++; \
 593     if(strcmp(arg, (m)) == 0) { \
 594         if(*++(a) == NULL) { \
 595             warnx(e); \
 596             usage(1); \
 597         } \
 598         ret = *(a); \
 599     } else if(strncmp(arg, (m), (n)) == 0 && arg[n] == '=') { \
 600          ret = arg + (n) + 1; \
 601     } \
 602     ret; \
 603 })
 604
 605 #define MAKEENVCOPY(e)  \
 606     if(!envCopy) { \
 607         envCopy = _copyenv(environ); \
 608         if(envCopy == NULL) \
 609             errx(1, (e)); \
 610     }
 611
 612 static void __dead2
 613 spawnFromArgs(CPU *cpu, char **argv)
 614 {
 615     const char *ap, *ret;
 616
 617     /* process arguments */
 618     for(argv++; *argv && **argv == '-'; argv++) {
 619         if((ret = MATCHARGWITHVALUE(argv, "-arch", 5, "-arch without architecture"))) {
 620             ap = ret;
 621         } else if(MATCHARG(argv, "-32")) {
 622             ap = NATIVE_32;
 623             if(!ap) {
 624                 unrecognizednative32seen = true;
 625                 continue;
 626             }
 627         } else if(MATCHARG(argv, "-64")) {
 628             ap = NATIVE_64;
 629             if(!ap) {
 630                 unrecognizednative64seen = true;
 631                 continue;
 632             }
 633         } else if(MATCHARG(argv, "-c")) {
 634             free(envCopy);
 635             envCopy = _copyenv(NULL); // create empty environment
 636             if(!envCopy)
 637                 errx(1, "Out of memory processing -c");
 638             continue;
 639         } else if((ret = MATCHARGWITHVALUE(argv, "-d", 2, "-d without envname"))) {
 640             MAKEENVCOPY("Out of memory processing -d");
 641             _unsetenvp(ret, &envCopy, NULL);
 642             continue;
 643         } else if((ret = MATCHARGWITHVALUE(argv, "-e", 2, "-e without envname=value"))) {
 644             MAKEENVCOPY("Out of memory processing -e");
 645             const char *cp = strchr(ret, '=');
 646             if(!cp) {
 647                 warnx("-e %s: no equal sign", ret);
 648                 usage(1);
 649             }
 650             cp++; // skip to value
 651             /*
 652              * _setenvp() only uses the name before any equal sign found in
 653              * the first argument.
 654              */
 655             _setenvp(ret, cp, 1, &envCopy, NULL);
 656             continue;
 657         } else if(MATCHARG(argv, "-h")) {
 658             usage(0);
 659         } else {
 660             ap = *argv + 1;
 661             if(*ap == '-') ap++;
 662         }
 663         addCPUbyname(cpu, ap);
 664     }
 665     if(cpu->errs)
 666         exit(1);
 667     if(!*argv || !**argv) {
 668         warnx("No command to execute");
 669         usage(1);
 670     }
 671     /* if the program is already a link to arch, then force execpath */
 672     int needexecpath = wrapped(*argv);
 673
 674     /*
 675      * If we don't have any architecutures, try ARCHPREFERENCE and plist
 676      * files.
 677      */
 678     if((cpu->count == 0) || needexecpath)
 679         spawnFromPreferences(cpu, needexecpath, argv); /* doesn't return */
 680
 681     /*
 682      * Call posix_spawnp on the program name.
 683      */
 684     spawnIt(cpu, 1, *argv, argv);
 685 }
 686
 687
 688 /* the main() routine */
 689 int
 690 main(int argc, char **argv)
 691 {
 692     const char *prog = getprogname();
 693     int my_name_is_arch;
 694     CPU cpu;
 695
 696     if(strcmp(prog, MACHINE_PROG) == 0) {
 697         if(argc > 1)
 698             errx(-1, "no arguments accepted");
 699         arch(0); /* the "machine" command was called */
 700     } else if((my_name_is_arch = (strcmp(prog, ARCH_PROG) == 0))) {
 701         if(argc == 1)
 702             arch(1); /* the "arch" command with no arguments was called */
 703     }
 704
 705     initCPU(&cpu);
 706
 707     if(my_name_is_arch)
 708         spawnFromArgs(&cpu, argv);
 709     else
 710         spawnFromPreferences(&cpu, 1, argv);
 711
 712     /* should never get here */
 713     errx(1, "returned from spawn");
 714 }