Listtree.mcc: use internal inherited class of NListtree
[AROS.git] / compiler / posixc / fdopen.c
blob7117b89a83e145ec2cc55da643fb4f9184040ab5
1 /*
2 Copyright © 1995-2013, The AROS Development Team. All rights reserved.
3 $Id$
5 POSIX.1-2008 function fdopen().
6 */
8 #include "__posixc_intbase.h"
10 #include <stdlib.h>
11 #include <fcntl.h>
12 #include <errno.h>
14 #include <exec/lists.h>
15 #include <proto/exec.h>
17 #include "__stdio.h"
18 #include "__fdesc.h"
20 /*****************************************************************************
22 NAME */
23 #include <stdio.h>
25 FILE *fdopen (
27 /* SYNOPSIS */
28 int filedes,
29 const char *mode
32 /* FUNCTION
33 function associates a stream with an existing file descriptor.
35 INPUTS
36 filedes - The descriptor the stream has to be associated with
37 mode - The mode of the stream (same as with fopen()) must be com­
38 patible with the mode of the file descriptor. The file
39 position indicator of the new stream is set to that
40 belonging to filedes, and the error and end-of-file indica­
41 tors are cleared. Modes "w" or "w+" do not cause trunca­
42 tion of the file. The file descriptor is not dup'ed, and
43 will be closed when the stream created by fdopen is
44 closed.
46 RESULT
47 NULL on error or the new stream associated with the descriptor.
49 The new descriptor returned by the call is the lowest numbered
50 descriptor currently not in use by the process.
52 NOTES
54 EXAMPLE
56 BUGS
58 SEE ALSO
59 open(), fclose(), fileno()
61 INTERNALS
63 ******************************************************************************/
65 struct PosixCIntBase *PosixCBase =
66 (struct PosixCIntBase *)__aros_getbase_PosixCBase();
67 int oflags, wanted_accmode, current_accmode;
68 fdesc *fdesc;
69 FILENODE *fn;
71 if (!(fdesc = __getfdesc(filedes)))
73 errno = EBADF;
74 return NULL;
77 oflags = fdesc->fcb->flags;
79 if (mode)
81 oflags = __smode2oflags(mode);
83 wanted_accmode = oflags & O_ACCMODE;
84 current_accmode = fdesc->fcb->flags & O_ACCMODE;
86 /*
87 Check if the requested access mode flags are a valid subset of the
88 flags the already open file has. Thus, if the file's access mode
89 is O_RDWR the requested mode can be anything (O_RDONLY, O_WRONLY or
90 O_RDWR), else they must match exactly.
93 if ((current_accmode != O_RDWR) && (wanted_accmode != current_accmode))
95 errno = EINVAL;
96 return NULL;
100 fn = AllocPooled(PosixCBase->internalpool, sizeof(FILENODE));
101 if (!fn) return NULL;
103 AddTail ((struct List *)&PosixCBase->stdio_files, (struct Node *)fn);
105 fn->File.flags = __oflags2sflags(oflags);
106 fn->File.fd = filedes;
108 return FILENODE2FILE(fn);