root/init/main.c

/* */

DEFINITIONS

1. get_options
2. profile_setup
3. ramdisk_setup
4. checksetup
5. calibrate_delay
6. parse_options
7. start_secondary
8. smp_idle
9. smp_init
10. smp_begin
11. start_kernel
12. printf
13. do_rc
14. do_shell
15. init

   1 /*
   2  *  linux/init/main.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *
   6  *  GK 2/5/95  -  Changed to support mounting root fs via NFS
   7  */
   8 
   9 #define __KERNEL_SYSCALLS__
  10 #include <stdarg.h>
  11 
  12 #include <asm/system.h>
  13 #include <asm/io.h>
  14 
  15 #include <linux/types.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/config.h>
  18 #include <linux/sched.h>
  19 #include <linux/tty.h>
  20 #include <linux/head.h>
  21 #include <linux/unistd.h>
  22 #include <linux/string.h>
  23 #include <linux/timer.h>
  24 #include <linux/fs.h>
  25 #include <linux/ctype.h>
  26 #include <linux/delay.h>
  27 #include <linux/utsname.h>
  28 #include <linux/ioport.h>
  29 #include <linux/hdreg.h>
  30 #include <linux/mm.h>
  31 #include <linux/major.h>
  32 
  33 #include <asm/bugs.h>
  34 
  35 extern char _stext, _etext;
  36 extern char *linux_banner;
  37 
  38 static char printbuf[1024];
  39 
  40 extern int console_loglevel;
  41 
  42 static int init(void *);
  43 
  44 extern void init_IRQ(void);
  45 extern void init_modules(void);
  46 extern long console_init(long, long);
  47 extern long kmalloc_init(long,long);
  48 extern void sock_init(void);
  49 extern long rd_init(long mem_start, int length);
  50 extern long pci_init(long, long);
  51 
  52 extern void swap_setup(char *str, int *ints);
  53 extern void buff_setup(char *str, int *ints);
  54 extern void bmouse_setup(char *str, int *ints);
  55 extern void eth_setup(char *str, int *ints);
  56 extern void xd_setup(char *str, int *ints);
  57 extern void floppy_setup(char *str, int *ints);
  58 extern void st_setup(char *str, int *ints);
  59 extern void st0x_setup(char *str, int *ints);
  60 extern void tmc8xx_setup(char *str, int *ints);
  61 extern void t128_setup(char *str, int *ints);
  62 extern void pas16_setup(char *str, int *ints);
  63 extern void generic_NCR5380_setup(char *str, int *intr);
  64 extern void aha152x_setup(char *str, int *ints);
  65 extern void aha1542_setup(char *str, int *ints);
  66 extern void aic7xxx_setup(char *str, int *ints);
  67 extern void BusLogic_Setup(char *str, int *ints);
  68 extern void fdomain_setup(char *str, int *ints);
  69 extern void NCR53c406a_setup(char *str, int *ints);
  70 extern void scsi_luns_setup(char *str, int *ints);
  71 extern void sound_setup(char *str, int *ints);
  72 #ifdef CONFIG_CDU31A
  73 extern void cdu31a_setup(char *str, int *ints);
  74 #endif CONFIG_CDU31A
  75 #ifdef CONFIG_MCD
  76 extern void mcd_setup(char *str, int *ints);
  77 #endif CONFIG_MCD
  78 #ifdef CONFIG_MCDX
  79 extern void mcdx_setup(char *str, int *ints);
  80 #endif CONFIG_MCDX
  81 #ifdef CONFIG_SBPCD
  82 extern void sbpcd_setup(char *str, int *ints);
  83 #endif CONFIG_SBPCD
  84 #ifdef CONFIG_AZTCD
  85 extern void aztcd_setup(char *str, int *ints);
  86 #endif CONFIG_AZTCD
  87 #ifdef CONFIG_CDU535
  88 extern void sonycd535_setup(char *str, int *ints);
  89 #endif CONFIG_CDU535
  90 #ifdef CONFIG_GSCD
  91 extern void gscd_setup(char *str, int *ints);
  92 #endif CONFIG_GSCD
  93 #ifdef CONFIG_CM206
  94 extern void cm206_setup(char *str, int *ints);
  95 #endif CONFIG_CM206
  96 #ifdef CONFIG_OPTCD
  97 extern void optcd_setup(char *str, int *ints);
  98 #endif CONFIG_OPTCD
  99 #ifdef CONFIG_SJCD
 100 extern void sjcd_setup(char *str, int *ints);
 101 #endif CONFIG_SJCD
 102 static void ramdisk_setup(char *str, int *ints);
 103 
 104 #ifdef CONFIG_SYSVIPC
 105 extern void ipc_init(void);
 106 #endif
 107 
 108 /*
 109  * Boot command-line arguments
 110  */
 111 #define MAX_INIT_ARGS 8
 112 #define MAX_INIT_ENVS 8
 113 
 114 extern void time_init(void);
 115 
 116 static unsigned long memory_start = 0;
 117 static unsigned long memory_end = 0;
 118 
 119 int rows, cols;
 120 
 121 int ramdisk_size;
 122 int root_mountflags = MS_RDONLY;
 123 
 124 #ifdef CONFIG_ROOT_NFS
 125 char nfs_root_name[256] = { 0, };
 126 extern int nfs_root_init(char *name);
 127 #endif
 128 
 129 static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
 130 static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
 131 
 132 static char * argv_rc[] = { "/bin/sh", NULL };
 133 static char * envp_rc[] = { "HOME=/", "TERM=linux", NULL };
 134 
 135 static char * argv[] = { "-/bin/sh",NULL };
 136 static char * envp[] = { "HOME=/usr/root", "TERM=linux", NULL };
 137 
 138 char *get_options(char *str, int *ints)
     /*  */
 139 {
 140         char *cur = str;
 141         int i=1;
 142 
 143         while (cur && isdigit(*cur) && i <= 10) {
 144                 ints[i++] = simple_strtoul(cur,NULL,0);
 145                 if ((cur = strchr(cur,',')) != NULL)
 146                         cur++;
 147         }
 148         ints[0] = i-1;
 149         return(cur);
 150 }
 151 
 152 static void profile_setup(char *str, int *ints)
     /*  */
 153 {
 154         if (ints[0] > 0)
 155                 prof_shift = (unsigned long) ints[1];
 156         else
 157 #ifdef CONFIG_PROFILE_SHIFT
 158                 prof_shift = CONFIG_PROFILE_SHIFT;
 159 #else
 160                 prof_shift = 2;
 161 #endif
 162 }
 163 
 164 struct {
 165         const char *str;
 166         void (*setup_func)(char *, int *);
 167 } bootsetups[] = {
 168         { "reserve=", reserve_setup },
 169         { "profile=", profile_setup },
 170         { "ramdisk=", ramdisk_setup },
 171         { "swap=", swap_setup },
 172         { "buff=", buff_setup },
 173 #ifdef CONFIG_BUGi386
 174         { "no-hlt", no_halt },
 175         { "no387", no_387 },
 176 #endif
 177 #ifdef CONFIG_INET
 178         { "ether=", eth_setup },
 179 #endif
 180 #ifdef CONFIG_SCSI
 181         { "max_scsi_luns=", scsi_luns_setup },
 182 #endif
 183 #if defined(CONFIG_BLK_DEV_HD)
 184         { "hd=", hd_setup },
 185 #endif
 186 #ifdef CONFIG_CHR_DEV_ST
 187         { "st=", st_setup },
 188 #endif
 189 #ifdef CONFIG_BUSMOUSE
 190         { "bmouse=", bmouse_setup },
 191 #endif
 192 #ifdef CONFIG_SCSI_SEAGATE
 193         { "st0x=", st0x_setup },
 194         { "tmc8xx=", tmc8xx_setup },
 195 #endif
 196 #ifdef CONFIG_SCSI_T128
 197         { "t128=", t128_setup },
 198 #endif
 199 #ifdef CONFIG_SCSI_PAS16
 200         { "pas16=", pas16_setup },
 201 #endif
 202 #ifdef CONFIG_SCSI_GENERIC_NCR5380
 203         { "ncr5380=", generic_NCR5380_setup },
 204 #endif
 205 #ifdef CONFIG_SCSI_AHA152X
 206         { "aha152x=", aha152x_setup},
 207 #endif
 208 #ifdef CONFIG_SCSI_AHA1542
 209         { "aha1542=", aha1542_setup},
 210 #endif
 211 #ifdef CONFIG_SCSI_AIC7XXX
 212         { "aic7xxx=", aic7xxx_setup},
 213 #endif
 214 #ifdef CONFIG_SCSI_BUSLOGIC
 215         { "BusLogic=", BusLogic_Setup},
 216 #endif
 217 #ifdef CONFIG_SCSI_NCR53C406A
 218         { "ncr53c406a=", NCR53c406a_setup},
 219 #endif
 220 #ifdef CONFIG_SCSI_FUTURE_DOMAIN
 221         { "fdomain=", fdomain_setup},
 222 #endif
 223 #ifdef CONFIG_BLK_DEV_XD
 224         { "xd=", xd_setup },
 225 #endif
 226 #ifdef CONFIG_BLK_DEV_FD
 227         { "floppy=", floppy_setup },
 228 #endif
 229 #ifdef CONFIG_CDU31A
 230         { "cdu31a=", cdu31a_setup },
 231 #endif CONFIG_CDU31A
 232 #ifdef CONFIG_MCD
 233         { "mcd=", mcd_setup },
 234 #endif CONFIG_MCD
 235 #ifdef CONFIG_MCDX
 236         { "mcdx=", mcdx_setup },
 237 #endif CONFIG_MCDX
 238 #ifdef CONFIG_SBPCD
 239         { "sbpcd=", sbpcd_setup },
 240 #endif CONFIG_SBPCD
 241 #ifdef CONFIG_AZTCD
 242         { "aztcd=", aztcd_setup },
 243 #endif CONFIG_AZTCD
 244 #ifdef CONFIG_CDU535
 245         { "sonycd535=", sonycd535_setup },
 246 #endif CONFIG_CDU535
 247 #ifdef CONFIG_GSCD
 248         { "gscd=", gscd_setup },
 249 #endif CONFIG_GSCD
 250 #ifdef CONFIG_CM206
 251         { "cm206=", cm206_setup },
 252 #endif CONFIG_CM206
 253 #ifdef CONFIG_OPTCD
 254         { "optcd=", optcd_setup },
 255 #endif CONFIG_OPTCD
 256 #ifdef CONFIG_SJCD
 257         { "sjcd=", sjcd_setup },
 258 #endif CONFIG_SJCD
 259 #ifdef CONFIG_SOUND
 260         { "sound=", sound_setup },
 261 #endif
 262         { 0, 0 }
 263 };
 264 
 265 static void ramdisk_setup(char *str, int *ints)
     /*  */
 266 {
 267    if (ints[0] > 0 && ints[1] >= 0)
 268       ramdisk_size = ints[1];
 269 }
 270 
 271 static int checksetup(char *line)
     /*  */
 272 {
 273         int i = 0;
 274         int ints[11];
 275 
 276 #ifdef CONFIG_BLK_DEV_IDE
 277         /* ide driver needs the basic string, rather than pre-processed values */
 278         if (!strncmp(line,"ide",3) || (!strncmp(line,"hd",2) && line[2] != '=')) {
 279                 ide_setup(line);
 280                 return 1;
 281         }
 282 #endif
 283         while (bootsetups[i].str) {
 284                 int n = strlen(bootsetups[i].str);
 285                 if (!strncmp(line,bootsetups[i].str,n)) {
 286                         bootsetups[i].setup_func(get_options(line+n,ints), ints);
 287                         return 1;
 288                 }
 289                 i++;
 290         }
 291         return 0;
 292 }
 293 
 294 /* this should be approx 2 Bo*oMips to start (note initial shift), and will
 295    still work even if initally too large, it will just take slightly longer */
 296 unsigned long loops_per_sec = (1<<12);
 297 
 298 /* This is the number of bits of precision for the loops_per_second.  Each
 299    bit takes on average 1.5/HZ seconds.  This (like the original) is a little
 300    better than 1% */
 301 #define LPS_PREC 8
 302 
 303 void calibrate_delay(void)
     /*  */
 304 {
 305         int ticks;
 306         int loopbit;
 307         int lps_precision = LPS_PREC;
 308 
 309         loops_per_sec = (1<<12);
 310 
 311         printk("Calibrating delay loop.. ");
 312         while (loops_per_sec <<= 1) {
 313                 /* wait for "start of" clock tick */
 314                 ticks = jiffies;
 315                 while (ticks == jiffies)
 316                         /* nothing */;
 317                 /* Go .. */
 318                 ticks = jiffies;
 319                 __delay(loops_per_sec);
 320                 ticks = jiffies - ticks;
 321                 if (ticks)
 322                         break;
 323                 }
 324 
 325 /* Do a binary approximation to get loops_per_second set to equal one clock
 326    (up to lps_precision bits) */
 327         loops_per_sec >>= 1;
 328         loopbit = loops_per_sec;
 329         while ( lps_precision-- && (loopbit >>= 1) ) {
 330                 loops_per_sec |= loopbit;
 331                 ticks = jiffies;
 332                 while (ticks == jiffies);
 333                 ticks = jiffies;
 334                 __delay(loops_per_sec);
 335                 if (jiffies != ticks)   /* longer than 1 tick */
 336                         loops_per_sec &= ~loopbit;
 337         }
 338 
 339 /* finally, adjust loops per second in terms of seconds instead of clocks */    
 340         loops_per_sec *= HZ;
 341 /* Round the value and print it */      
 342         printk("ok - %lu.%02lu BogoMIPS\n",
 343                 (loops_per_sec+2500)/500000,
 344                 ((loops_per_sec+2500)/5000) % 100);
 345 }
 346 
 347 /*
 348  * This is a simple kernel command line parsing function: it parses
 349  * the command line, and fills in the arguments/environment to init
 350  * as appropriate. Any cmd-line option is taken to be an environment
 351  * variable if it contains the character '='.
 352  *
 353  *
 354  * This routine also checks for options meant for the kernel.
 355  * These options are not given to init - they are for internal kernel use only.
 356  */
 357 static void parse_options(char *line)
     /*  */
 358 {
 359         char *next;
 360 #ifdef CONFIG_ROOT_NFS
 361         char *devnames[] = { "nfs", "hda", "hdb", "hdc", "hdd", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
 362         int devnums[]    = { 0x0FF, 0x300, 0x340, 0x1600, 0x1640, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0};
 363 #else
 364         static const char *devnames[] = { "hda", "hdb", "hdc", "hdd", "sda", "sdb", "sdc", "sdd", "sde", "fd", "xda", "xdb", NULL };
 365         static int devnums[]    = { 0x300, 0x340, 0x1600, 0x1640, 0x800, 0x810, 0x820, 0x830, 0x840, 0x200, 0xD00, 0xD40, 0};
 366 #endif
 367         int args, envs;
 368         if (!*line)
 369                 return;
 370         args = 0;
 371         envs = 1;       /* TERM is set to 'linux' by default */
 372         next = line;
 373         while ((line = next) != NULL) {
 374                 if ((next = strchr(line,' ')) != NULL)
 375                         *next++ = 0;
 376                 /*
 377                  * check for kernel options first..
 378                  */
 379                 if (!strncmp(line,"root=",5)) {
 380                         int n;
 381                         line += 5;
 382                         if (strncmp(line,"/dev/",5)) {
 383                                 ROOT_DEV = to_kdev_t(
 384                                              simple_strtoul(line,NULL,16));
 385                                 continue;
 386                         }
 387                         line += 5;
 388                         for (n = 0 ; devnames[n] ; n++) {
 389                                 int len = strlen(devnames[n]);
 390                                 if (!strncmp(line,devnames[n],len)) {
 391                                         ROOT_DEV = to_kdev_t(devnums[n]+
 392                                              simple_strtoul(line+len,NULL,0));
 393                                         break;
 394                                 }
 395                         }
 396                         continue;
 397                 }
 398 #ifdef CONFIG_ROOT_NFS
 399                 if (!strncmp(line,"nfsroot=",8)) {
 400                         int n = 255 - strlen (NFS_ROOT);
 401                         line += 8;
 402                         if (line [0] == '/' || (line [0] >= '0' && line [0] <= '9')){
 403                                 strncpy (nfs_root_name, line, 255);
 404                                 continue;
 405                         }
 406                         if (strlen (line) >= n)
 407                                 line [n] = 0;
 408                         sprintf (nfs_root_name, NFS_ROOT, line);
 409                         continue;
 410                 }
 411 #endif
 412                 if (!strcmp(line,"ro")) {
 413                         root_mountflags |= MS_RDONLY;
 414                         continue;
 415                 }
 416                 if (!strcmp(line,"rw")) {
 417                         root_mountflags &= ~MS_RDONLY;
 418                         continue;
 419                 }
 420                 if (!strcmp(line,"debug")) {
 421                         console_loglevel = 10;
 422                         continue;
 423                 }
 424                 if (checksetup(line))
 425                         continue;
 426                 /*
 427                  * Then check if it's an environment variable or
 428                  * an option.
 429                  */
 430                 if (strchr(line,'=')) {
 431                         if (envs >= MAX_INIT_ENVS)
 432                                 break;
 433                         envp_init[++envs] = line;
 434                 } else {
 435                         if (args >= MAX_INIT_ARGS)
 436                                 break;
 437                         argv_init[++args] = line;
 438                 }
 439         }
 440         argv_init[args+1] = NULL;
 441         envp_init[envs+1] = NULL;
 442 }
 443 
 444 extern void setup_arch(char **, unsigned long *, unsigned long *);
 445 
 446 #ifdef __SMP__
 447 /*
 448  *      Activate a secondary processor.
 449  */
 450  
 451 asmlinkage void start_secondary(void)
     /*  */
 452 {
 453         trap_init();
 454         init_IRQ();
 455         smp_callin();
 456         for(;;)
 457                 idle();
 458 }
 459 
 460 int smp_idle(void * unused)
     /*  */
 461 {
 462         for (;;)
 463                 idle();
 464 }
 465 
 466 /*
 467  *      Called by CPU#0 to activate the rest.
 468  */
 469  
 470 static void smp_init(void)
     /*  */
 471 {
 472         int i=0;
 473         smp_boot_cpus();
 474         
 475         /*
 476          *      Create the slave init tasks as sharing pid 0.
 477          */
 478 
 479         for(i=1;i<smp_num_cpus;i++)
 480         {
 481                 kernel_thread(smp_idle, NULL, CLONE_PID);
 482                 /*
 483                  *      Assume linear processor numbering
 484                  */
 485                 current_set[i]=task[i];
 486                 current_set[i]->processor=i;
 487         }
 488 }               
 489 
 490 /*
 491  *      The autoprobe routines assume CPU#0 on the i386
 492  *      so we don't actually set the game in motion until
 493  *      they are finished.
 494  */
 495  
 496 static void smp_begin(void)
     /*  */
 497 {
 498         smp_threads_ready=1;
 499         smp_commence();
 500 }
 501         
 502 #endif
 503 
 504 /*
 505  *      Activate the first processor.
 506  */
 507  
 508 asmlinkage void start_kernel(void)
     /*  */
 509 {
 510         char * command_line;
 511 
 512 /*
 513  *      This little check will move.
 514  */
 515 
 516 #ifdef __SMP__
 517         static int first_cpu=1;
 518         
 519         if(!first_cpu)
 520                 start_secondary();
 521         first_cpu=0;
 522         
 523 #endif  
 524 /*
 525  * Interrupts are still disabled. Do necessary setups, then
 526  * enable them
 527  */
 528         setup_arch(&command_line, &memory_start, &memory_end);
 529         memory_start = paging_init(memory_start,memory_end);
 530         trap_init();
 531         init_IRQ();
 532         sched_init();
 533         time_init();
 534         parse_options(command_line);
 535         init_modules();
 536 #ifdef CONFIG_PROFILE
 537         if (!prof_shift)
 538 #ifdef CONFIG_PROFILE_SHIFT
 539                 prof_shift = CONFIG_PROFILE_SHIFT;
 540 #else
 541                 prof_shift = 2;
 542 #endif
 543 #endif
 544         if (prof_shift) {
 545                 prof_buffer = (unsigned long *) memory_start;
 546                 /* only text is profiled */
 547                 prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
 548                 prof_len >>= prof_shift;
 549                 memory_start += prof_len * sizeof(unsigned long);
 550         }
 551         memory_start = console_init(memory_start,memory_end);
 552 #ifdef CONFIG_PCI
 553         memory_start = pci_init(memory_start,memory_end);
 554 #endif
 555         memory_start = kmalloc_init(memory_start,memory_end);
 556         sti();
 557         calibrate_delay();
 558         memory_start = inode_init(memory_start,memory_end);
 559         memory_start = file_table_init(memory_start,memory_end);
 560         memory_start = name_cache_init(memory_start,memory_end);
 561         if (ramdisk_size)
 562                 memory_start += rd_init(memory_start, ramdisk_size*1024);
 563         mem_init(memory_start,memory_end);
 564         buffer_init();
 565         sock_init();
 566 #ifdef CONFIG_SYSVIPC
 567         ipc_init();
 568 #endif
 569         sti();
 570         check_bugs();
 571 
 572         printk(linux_banner);
 573 #ifdef __SMP__
 574         smp_init();
 575 #endif
 576         /* we count on the initial thread going ok */
 577         kernel_thread(init, NULL, 0);
 578 /*
 579  * task[0] is meant to be used as an "idle" task: it may not sleep, but
 580  * it might do some general things like count free pages or it could be
 581  * used to implement a reasonable LRU algorithm for the paging routines:
 582  * anything that can be useful, but shouldn't take time from the real
 583  * processes.
 584  *
 585  * Right now task[0] just does a infinite idle loop.
 586  */
 587         for(;;)
 588                 idle();
 589 }
 590 
 591 static int printf(const char *fmt, ...)
     /*  */
 592 {
 593         va_list args;
 594         int i;
 595 
 596         va_start(args, fmt);
 597         write(1,printbuf,i=vsprintf(printbuf, fmt, args));
 598         va_end(args);
 599         return i;
 600 }
 601 
 602 static int do_rc(void * rc)
     /*  */
 603 {
 604         close(0);
 605         if (open(rc,O_RDONLY,0))
 606                 return -1;
 607         return execve("/bin/sh", argv_rc, envp_rc);
 608 }
 609 
 610 static int do_shell(void * shell)
     /*  */
 611 {
 612         close(0);close(1);close(2);
 613         setsid();
 614         (void) open("/dev/tty1",O_RDWR,0);
 615         (void) dup(0);
 616         (void) dup(0);
 617         return execve(shell, argv, envp);
 618 }
 619 
 620 static int init(void * unused)
     /*  */
 621 {
 622         int pid,i;
 623 
 624         setup();
 625 
 626 #ifdef __SMP__
 627         /*
 628          *      With the devices probed and setup we can
 629          *      now enter SMP mode.
 630          */
 631         
 632         smp_begin();
 633 #endif  
 634 
 635         #ifdef CONFIG_UMSDOS_FS
 636         {
 637                 /*
 638                         When mounting a umsdos fs as root, we detect
 639                         the pseudo_root (/linux) and initialise it here.
 640                         pseudo_root is defined in fs/umsdos/inode.c
 641                 */
 642                 extern struct inode *pseudo_root;
 643                 if (pseudo_root != NULL){
 644                         current->fs->root = pseudo_root;
 645                         current->fs->pwd  = pseudo_root;
 646                 }
 647         }
 648         #endif
 649 
 650         (void) open("/dev/tty1",O_RDWR,0);
 651         (void) dup(0);
 652         (void) dup(0);
 653 
 654         execve("/etc/init",argv_init,envp_init);
 655         execve("/bin/init",argv_init,envp_init);
 656         execve("/sbin/init",argv_init,envp_init);
 657         /* if this fails, fall through to original stuff */
 658 
 659         pid = kernel_thread(do_rc, "/etc/rc", SIGCHLD);
 660         if (pid>0)
 661                 while (pid != wait(&i))
 662                         /* nothing */;
 663         while (1) {
 664                 pid = kernel_thread(do_shell, "/bin/sh", SIGCHLD);
 665                 if (pid < 0) {
 666                         printf("Fork failed in init\n\r");
 667                         continue;
 668                 }
 669                 while (1)
 670                         if (pid == wait(&i))
 671                                 break;
 672                 printf("\n\rchild %d died with code %04x\n\r",pid,i);
 673                 sync();
 674         }
 675         return -1;
 676 }

/* */