compiler/clib/__open.c

   1 /*
   2     Copyright © 1995-2007, 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 <dos/dos.h>
  22 #include <dos/filesystem.h>
  23 #include <aros/symbolsets.h>
  24 #include <aros/debug.h>
  25 #include "__errno.h"
  26 #include "__open.h"
  27 #include "__upath.h"
  28
  29 int c;
  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_TRUNC)    openmode |= FMF_CLEAR;
 104     if (flags & O_CREAT)    openmode |= FMF_CREATE;
 105     if (flags & O_NONBLOCK) openmode |= FMF_NONBLOCK;
 106     if (flags & O_APPEND)   openmode |= FMF_APPEND;
 107
 108     return openmode;
 109 }
 110
 111 int __open(int wanted_fd, const char *pathname, int flags, int mode)
 112 {
 113     BPTR fh = NULL, lock = NULL;
 114     fdesc *currdesc = 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     currdesc = malloc(sizeof(fdesc));
 138     if (!currdesc) { D(bug("__open: no memory [1]\n")); goto err; }
 139
 140     wanted_fd = __getfdslot(wanted_fd);
 141     if (wanted_fd == -1) { D(bug("__open: no free fd\n")); goto err; }
 142
 143     lock = Lock((char *)pathname, SHARED_LOCK);
 144     if (!lock)
 145     {
 146         if
 147         (
 148             (IoErr() != ERROR_OBJECT_NOT_FOUND) ||
 149             /* If the file doesn't exist and the flag O_CREAT is not set return an error */
 150             (IoErr() == ERROR_OBJECT_NOT_FOUND && !(flags & O_CREAT))
 151         )
 152         {
 153             errno = IoErr2errno(IoErr());
 154             goto err;
 155         }
 156     }
 157     else
 158     {
 159         /* If the file exists, but O_EXCL is set, then return an error */
 160         if (flags & O_EXCL)
 161         {
 162             errno = EEXIST;
 163             goto err;
 164         }
 165
 166         fib = AllocDosObject(DOS_FIB, NULL);
 167         if (!fib)
 168         {
 169            errno = IoErr2errno(IoErr());
 170            goto err;
 171         }
 172
 173         if (!Examine(lock, fib))
 174         {
 175             /*
 176                 The filesystem in which the files resides doesn't support
 177                 the EXAMINE action. It might be broken or migth also not
 178                 be a filesystem at all. So let's assume the file is not a
 179                 diretory.
 180            */
 181            fib->fib_DirEntryType = 0;
 182         }
 183
 184 #       warning implement softlink handling
 185
 186         /* Check if it's a directory or a softlink.
 187            Softlinks are not handled yet, though */
 188         if (fib->fib_DirEntryType > 0)
 189         {
 190             /* A directory cannot be opened for writing */
 191             if (openmode & FMF_WRITE)
 192             {
 193                 errno = EISDIR;
 194                 goto err;
 195             }
 196
 197             fh = lock;
 198             FreeDosObject(DOS_FIB, fib);
 199
 200             goto success;
 201         }
 202         FreeDosObject(DOS_FIB, fib);
 203         fib = NULL;
 204     }
 205
 206     /* the file exists and it's not a directory or the file doesn't exist */
 207
 208     if (!(fh = Open ((char *)pathname, openmode)) )
 209     {
 210         errno = IoErr2errno (IoErr ());
 211         goto err;
 212     }
 213
 214     if (lock) UnLock(lock);
 215
 216 success:
 217     currdesc->fh        = fh;
 218     currdesc->flags     = flags;
 219     currdesc->opencount = 1;
 220
 221     __setfdesc(wanted_fd, currdesc);
 222
 223     D(bug("__open: exiting fd=%d\n", wanted_fd));
 224
 225     return wanted_fd;
 226
 227 err:
 228     if (fib) FreeDosObject(DOS_FIB, fib);
 229     if (currdesc) free(currdesc);
 230     if (fh && fh != lock) Close(fh);
 231     if (lock) UnLock(lock);
 232
 233     D(bug("__open: exiting with error %d\n", errno ));
 234
 235     return -1;
 236 }
 237
 238
 239 #warning perhaps this has to be handled in a different way...
 240 int __init_stdfiles(void)
 241 {
 242     struct Process *me;
 243     fdesc *indesc=NULL, *outdesc=NULL, *errdesc=NULL;
 244     int res = __getfdslot(2);
 245
 246     if
 247     (
 248         res == -1                           ||
 249         !(indesc  = malloc(sizeof(fdesc))) ||
 250         !(outdesc = malloc(sizeof(fdesc))) ||
 251         !(errdesc = malloc(sizeof(fdesc)))
 252     )
 253     {
 254         SetIoErr(ERROR_NO_FREE_STORE);
 255         return 0;
 256     }
 257
 258     me = (struct Process *)FindTask (NULL);
 259     indesc->fh  = __stdfiles[STDIN_FILENO]  = Input();
 260     outdesc->fh = __stdfiles[STDOUT_FILENO] = Output();
 261     errdesc->fh = __stdfiles[STDERR_FILENO] = me->pr_CES ? me->pr_CES : me->pr_COS;
 262
 263     indesc->flags  = O_RDONLY;
 264     outdesc->flags = O_WRONLY | O_APPEND;
 265     errdesc->flags = O_WRONLY | O_APPEND;
 266
 267     indesc->opencount = outdesc->opencount = errdesc->opencount = 1;
 268
 269     __fd_array[STDIN_FILENO]  = indesc;
 270     __fd_array[STDOUT_FILENO] = outdesc;
 271     __fd_array[STDERR_FILENO] = errdesc;
 272
 273     return 1;
 274 }
 275
 276 void __exit_stdfiles(void)
 277 {
 278     int i = __numslots;
 279     while (i)
 280     {
 281         if (__fd_array[--i])
 282             close(i);
 283     }
 284 }
 285
 286 #include <stdio.h>
 287
 288 void __updatestdio(void)
 289 {
 290     struct Process *me;
 291
 292     me = (struct Process *)FindTask(NULL);
 293
 294     fflush(stdin);
 295     fflush(stdout);
 296     fflush(stderr);
 297
 298     __fd_array[STDIN_FILENO]->fh  = __stdfiles[STDIN_FILENO]  = Input();
 299     __fd_array[STDOUT_FILENO]->fh = __stdfiles[STDOUT_FILENO] = Output();
 300     __fd_array[STDERR_FILENO]->fh = __stdfiles[STDERR_FILENO] = me->pr_CES ? me->pr_CES : me->pr_COS;
 301 }
 302
 303 ADD2INIT(__init_stdfiles, 2);
 304 ADD2EXIT(__exit_stdfiles, 2);