compiler/clib/__open.c

   1 /*
   2     Copyright © 1995-2009, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     File descriptors handling internals.
   6 */
   7
   8 #include "__arosc_privdata.h"
   9
  10 #include <string.h>
  11 #include <fcntl.h>
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <errno.h>
  15
  16 #define DEBUG 0
  17
  18 #include <proto/exec.h>
  19 #include <proto/dos.h>
  20 #include <exec/memory.h>
  21 #include <exec/semaphores.h>
  22 #include <dos/dos.h>
  23 #include <dos/filesystem.h>
  24 #include <aros/symbolsets.h>
  25 #include <aros/debug.h>
  26 #include "__errno.h"
  27 #include "__open.h"
  28 #include "__upath.h"
  29
  30
  31 fdesc *__getfdesc(register int fd)
  32 {
  33     return ((__numslots>fd) && (fd>=0))?__fd_array[fd]:NULL;
  34 }
  35
  36 void __setfdesc(register int fd, fdesc *desc)
  37 {
  38     /* FIXME: Check if fd is in valid range... */
  39     __fd_array[fd] = desc;
  40 }
  41
  42 int __getfirstfd(register int startfd)
  43 {
  44     /* FIXME: Check if fd is in valid range... */
  45     for (
  46         ;
  47         startfd < __numslots && __fd_array[startfd];
  48         startfd++
  49     );
  50
  51     return startfd;
  52 }
  53
  54 int __getfdslot(int wanted_fd)
  55 {
  56     if (wanted_fd>=__numslots)
  57     {
  58         void *tmp;
  59
  60         tmp = malloc((wanted_fd+1)*sizeof(fdesc *));
  61
  62         if (!tmp) return -1;
  63
  64         if (__fd_array)
  65         {
  66             CopyMem(__fd_array, tmp, __numslots*sizeof(fdesc *));
  67             free(__fd_array);
  68         }
  69
  70         __fd_array = tmp;
  71
  72         bzero(__fd_array + __numslots, (wanted_fd - __numslots + 1) * sizeof(fdesc *));
  73         __numslots = wanted_fd+1;
  74     }
  75     else if (wanted_fd < 0)
  76     {
  77         errno = EINVAL;
  78         return -1;
  79     }
  80     else if (__fd_array[wanted_fd])
  81     {
  82         close(wanted_fd);
  83     }
  84
  85     return wanted_fd;
  86 }
  87
  88 LONG __oflags2amode(int flags)
  89 {
  90     LONG openmode = 0;
  91
  92     /* filter out invalid modes */
  93     switch (flags & (O_CREAT|O_TRUNC|O_EXCL))
  94     {
  95         case O_EXCL:
  96         case O_EXCL|O_TRUNC:
  97             return -1;
  98     }
  99
 100     if (flags & O_WRITE)    openmode |= FMF_WRITE;
 101     if (flags & O_READ)     openmode |= FMF_READ;
 102     if (flags & O_EXEC)     openmode |= FMF_EXECUTE;
 103     if (flags & O_CREAT)    openmode |= FMF_CREATE;
 104     if (flags & O_NONBLOCK) openmode |= FMF_NONBLOCK;
 105     if (flags & O_APPEND)   openmode |= FMF_APPEND;
 106
 107     return openmode;
 108 }
 109
 110 int __open(int wanted_fd, const char *pathname, int flags, int mode)
 111 {
 112     BPTR fh = NULL, lock = NULL;
 113     fdesc *currdesc = NULL;
 114     fcb *cblock = NULL;
 115     struct FileInfoBlock *fib = NULL;
 116     LONG  openmode = __oflags2amode(flags);
 117
 118     if (__doupath && pathname[0] == '\0')
 119     {
 120         /* On *nix "" is not really a valid file name.  */
 121         errno = ENOENT;
 122         return -1;
 123     }
 124
 125     pathname = __path_u2a(pathname);
 126     if (!pathname) return -1;
 127
 128     D(bug("__open: entering, wanted fd = %d, path = %s, flags = %d, mode = %d\n", wanted_fd, pathname, flags, mode));
 129
 130     if (openmode == -1)
 131     {
 132         errno = EINVAL;
 133         D(bug( "__open: exiting with error EINVAL\n"));
 134         return -1;
 135     }
 136
 137     cblock = AllocVec(sizeof(fcb), MEMF_ANY | MEMF_CLEAR);
 138     if (!cblock) { D(bug("__open: no memory [1]\n")); goto err; }
 139     currdesc = __alloc_fdesc();
 140     if (!currdesc) { D(bug("__open: no memory [2]\n")); goto err; }
 141     currdesc->fdflags = 0;
 142     currdesc->fcb = cblock;
 143
 144     wanted_fd = __getfdslot(wanted_fd);
 145     if (wanted_fd == -1) { D(bug("__open: no free fd\n")); goto err; }
 146
 147     lock = Lock((char *)pathname, SHARED_LOCK);
 148     if (!lock)
 149     {
 150         if
 151         (
 152             (IoErr() != ERROR_OBJECT_NOT_FOUND) ||
 153             /* If the file doesn't exist and the flag O_CREAT is not set return an error */
 154             (IoErr() == ERROR_OBJECT_NOT_FOUND && !(flags & O_CREAT))
 155         )
 156         {
 157             errno = IoErr2errno(IoErr());
 158             goto err;
 159         }
 160     }
 161     else
 162     {
 163         /* If the file exists, but O_EXCL is set, then return an error */
 164         if (flags & O_EXCL)
 165         {
 166             errno = EEXIST;
 167             goto err;
 168         }
 169
 170         fib = AllocDosObject(DOS_FIB, NULL);
 171         if (!fib)
 172         {
 173            errno = IoErr2errno(IoErr());
 174            goto err;
 175         }
 176
 177         if (!Examine(lock, fib))
 178         {
 179             /*
 180                 The filesystem in which the file resides doesn't support
 181                 the EXAMINE action. It might be broken or might also not
 182                 be a filesystem at all. So let's assume the file is not a
 183                 diretory.
 184            */
 185            fib->fib_DirEntryType = 0;
 186         }
 187
 188 #       warning implement softlink handling
 189
 190         /* Check if it's a directory or a softlink.
 191            Softlinks are not handled yet, though */
 192         if (fib->fib_DirEntryType > 0)
 193         {
 194             /* A directory cannot be opened for writing */
 195             if (openmode & FMF_WRITE)
 196             {
 197                 errno = EISDIR;
 198                 goto err;
 199             }
 200
 201             fh = lock;
 202             FreeDosObject(DOS_FIB, fib);
 203             currdesc->fcb->isdir = 1;
 204
 205             goto success;
 206         }
 207         FreeDosObject(DOS_FIB, fib);
 208         fib = NULL;
 209     }
 210
 211     /* the file exists and it's not a directory or the file doesn't exist */
 212
 213     if (lock)
 214     {
 215         UnLock(lock);
 216         lock = NULL;
 217     }
 218
 219     if (openmode & (FMF_APPEND | FMF_WRITE))
 220         openmode |= FMF_READ; /* force filesystem ACTION_FINDUPDATE */
 221
 222     if (!(fh = Open ((char *)pathname, openmode)) )
 223     {
 224         ULONG ioerr = IoErr();
 225         D(bug("[clib] Open ioerr=%d\n", ioerr));
 226         errno = IoErr2errno(ioerr);
 227         goto err;
 228     }
 229
 230     if((flags & O_TRUNC) && (flags & (O_RDWR | O_WRONLY)))
 231     {
 232         if(SetFileSize(fh, 0, OFFSET_BEGINNING) != 0)
 233         {
 234             /* Ignore error if FSA_SET_FILE_SIZE is not implemented */
 235             if(IoErr() != ERROR_NOT_IMPLEMENTED)
 236             {
 237                 errno = IoErr2errno(IoErr());
 238                 goto err;
 239             }
 240         }
 241     }
 242
 243 success:
 244     currdesc->fcb->fh        = fh;
 245     currdesc->fcb->flags     = flags;
 246     currdesc->fcb->opencount = 1;
 247
 248     __setfdesc(wanted_fd, currdesc);
 249
 250     D(bug("__open: exiting fd=%d\n", wanted_fd));
 251
 252     return wanted_fd;
 253
 254 err:
 255     if (fib) FreeDosObject(DOS_FIB, fib);
 256     if (cblock) FreeVec(cblock);
 257     if (currdesc) __free_fdesc(currdesc);
 258     if (fh && fh != lock) Close(fh);
 259     if (lock) UnLock(lock);
 260
 261     D(bug("__open: exiting with error %d\n", errno ));
 262
 263     return -1;
 264 }
 265
 266 fdesc *__alloc_fdesc(void)
 267 {
 268     fdesc * fdesc;
 269
 270     fdesc = AllocPooled(__fd_mempool, sizeof(fdesc));
 271
 272     D(bug("Allocated fdesc %x from %x pool\n", fdesc, __fd_mempool));
 273
 274     return fdesc;
 275 }
 276
 277 void __free_fdesc(fdesc *fdesc)
 278 {
 279     D(bug("Freeing fdesc %x from %x pool\n", fdesc, __fd_mempool));
 280     FreePooled(__fd_mempool, fdesc, sizeof(fdesc));
 281 }
 282
 283
 284 struct __reg_fdarray {
 285     struct MinNode node;
 286     struct Task *task;
 287     fdesc **fdarray;
 288     int numslots;
 289 };
 290
 291 /* Some local variables for register_init_fdarray */
 292 static int __fdinit = 0;
 293 static struct SignalSemaphore __fdsem;
 294 static struct MinList __fdreglist;
 295
 296 int __init_vars(void)
 297 {
 298     InitSemaphore(&__fdsem);
 299     NEWLIST(&__fdreglist);
 300
 301     return TRUE;
 302 }
 303
 304 int __register_init_fdarray(fdesc **__fdarray, int numslots)
 305 {
 306     /* arosc privdata should not be used inside this function,
 307      * this function is called before aroscbase is initialized
 308      */
 309     struct __reg_fdarray *regnode = AllocVec(sizeof(struct __reg_fdarray), MEMF_ANY|MEMF_CLEAR);
 310
 311     if (regnode == NULL)
 312         return 0;
 313
 314     regnode->task = FindTask(NULL);
 315     regnode->fdarray = __fdarray;
 316     regnode->numslots = numslots;
 317
 318     D(bug("Allocated regnode: %p, fdarray: %p, numslots: %d\n",
 319           regnode, regnode->fdarray, regnode->numslots
 320     ));
 321
 322     ObtainSemaphore(&__fdsem);
 323     AddHead((struct List *)&__fdreglist, (struct Node *)regnode);
 324     ReleaseSemaphore(&__fdsem);
 325
 326     return 1;
 327 }
 328
 329
 330 #warning perhaps this has to be handled in a different way...
 331 int __init_stdfiles(void)
 332 {
 333     struct Process *me;
 334     fcb *infcb = NULL, *outfcb = NULL, *errfcb = NULL;
 335     fdesc *indesc=NULL, *outdesc=NULL, *errdesc=NULL;
 336     int res = __getfdslot(2);
 337
 338     if
 339     (
 340         res == -1                           ||
 341         !(infcb  = AllocVec(sizeof(fcb), MEMF_ANY | MEMF_CLEAR)) ||
 342         !(indesc  = __alloc_fdesc()) ||
 343         !(outfcb = AllocVec(sizeof(fcb), MEMF_ANY | MEMF_CLEAR)) ||
 344         !(outdesc = __alloc_fdesc()) ||
 345         !(errfcb = AllocVec(sizeof(fcb), MEMF_ANY | MEMF_CLEAR)) ||
 346         !(errdesc = __alloc_fdesc())
 347     )
 348     {
 349         if(infcb)
 350             FreeVec(infcb);
 351         if(indesc)
 352             __free_fdesc(indesc);
 353         if(outfcb)
 354             FreeVec(outfcb);
 355         if(outdesc)
 356             __free_fdesc(outdesc);
 357         if(errfcb)
 358             FreeVec(errfcb);
 359         if(errdesc)
 360             __free_fdesc(errdesc);
 361         SetIoErr(ERROR_NO_FREE_STORE);
 362         return 0;
 363     }
 364
 365     indesc->fdflags = 0;
 366     outdesc->fdflags = 0;
 367     errdesc->fdflags = 0;
 368
 369     indesc->fcb = infcb;
 370     outdesc->fcb = outfcb;
 371     errdesc->fcb = errfcb;
 372
 373     me = (struct Process *)FindTask (NULL);
 374     indesc->fcb->fh  = Input();
 375     outdesc->fcb->fh = Output();
 376     errdesc->fcb->fh = me->pr_CES ? me->pr_CES : me->pr_COS;
 377
 378     indesc->fcb->flags  = O_RDONLY;
 379     outdesc->fcb->flags = O_WRONLY | O_APPEND;
 380     errdesc->fcb->flags = O_WRONLY | O_APPEND;
 381
 382     indesc->fcb->opencount = outdesc->fcb->opencount = errdesc->fcb->opencount = 1;
 383     indesc->fcb->privflags = outdesc->fcb->privflags = errdesc->fcb->privflags = _FCB_DONTCLOSE_FH;
 384
 385     __fd_array[STDIN_FILENO]  = indesc;
 386     __fd_array[STDOUT_FILENO] = outdesc;
 387     __fd_array[STDERR_FILENO] = errdesc;
 388
 389     return 1;
 390 }
 391
 392 static int __copy_fdarray(fdesc **__src_fd_array, int numslots)
 393 {
 394     int i;
 395
 396     for(i = numslots - 1; i >= 0; i--)
 397     {
 398         if(__src_fd_array[i])
 399         {
 400             if(__getfdslot(i) != i)
 401                 return 0;
 402
 403             if((__fd_array[i] = __alloc_fdesc()) == NULL)
 404                 return 0;
 405
 406             __fd_array[i]->fdflags = 0;
 407             __fd_array[i]->fcb = __src_fd_array[i]->fcb;
 408             __fd_array[i]->fcb->opencount++;
 409         }
 410     }
 411
 412     return 1;
 413 }
 414
 415 int __init_fd(void)
 416 {
 417     struct __reg_fdarray *regnodeit, *regnode = NULL;
 418     struct Task *self = FindTask(NULL);
 419
 420     if (!__fdinit)
 421     {
 422         __init_vars();
 423         __fdinit = 1;
 424     }
 425
 426     __fd_mempool = CreatePool(MEMF_PUBLIC, 16*sizeof(fdesc), 16*sizeof(fdesc));
 427
 428     ObtainSemaphore(&__fdsem);
 429     ForeachNode(&__fdreglist, regnodeit)
 430     {
 431         if (regnodeit->task == self)
 432         {
 433             regnode = regnodeit;
 434
 435             D(bug("Found regnode: %p, fdarray: %p, numslots: %d\n",
 436                   regnode, regnode->fdarray, regnode->numslots
 437             ));
 438             Remove((struct Node *)regnode);
 439             break;
 440         }
 441     }
 442     ReleaseSemaphore(&__fdsem);
 443
 444     if (regnode == NULL)
 445         return __init_stdfiles();
 446     else
 447     {
 448         int ok = __copy_fdarray(regnode->fdarray, regnode->numslots);
 449
 450         FreeVec(regnode);
 451
 452         return ok;
 453     }
 454 }
 455
 456 void __exit_fd(void)
 457 {
 458     int i = __numslots;
 459     while (i)
 460     {
 461         if (__fd_array[--i])
 462             close(i);
 463     }
 464     DeletePool(__fd_mempool);
 465 }
 466
 467 #include <stdio.h>
 468
 469 void __updatestdio(void)
 470 {
 471     struct Process *me;
 472
 473     me = (struct Process *)FindTask(NULL);
 474
 475     fflush(stdin);
 476     fflush(stdout);
 477     fflush(stderr);
 478
 479     __fd_array[STDIN_FILENO]->fcb->fh  = Input();
 480     __fd_array[STDOUT_FILENO]->fcb->fh = Output();
 481     __fd_array[STDERR_FILENO]->fcb->fh = me->pr_CES ? me->pr_CES : me->pr_COS;
 482
 483     __fd_array[STDIN_FILENO]->fcb->privflags =
 484         __fd_array[STDOUT_FILENO]->fcb->privflags =
 485         __fd_array[STDERR_FILENO]->fcb->privflags = _FCB_DONTCLOSE_FH;
 486 }
 487
 488 ADD2INIT(__init_fd, 2);
 489 ADD2EXIT(__exit_fd, 2);