1 /* Copyright (c) 2003 Christopher Faylor <me@cgf.cx> */
2 /*
3 FUNCTION
4 <<fdopen64>>---turn open large file into a stream
5
6 INDEX
7 fdopen64
8 INDEX
9 _fdopen64_r
10
11 SYNOPSIS
12 #include <stdio.h>
13 FILE *fdopen64(int <[fd]>, const char *<[mode]>);
14 FILE *_fdopen64_r(void *<[reent]>,
15 int <[fd]>, const char *<[mode]>);
16
17 DESCRIPTION
18 <<fdopen64>> produces a file descriptor of type <<FILE *>>, from a
19 descriptor for an already-open file (returned, for example, by the
20 system subroutine <<open>> rather than by <<fopen>>).
21 The <[mode]> argument has the same meanings as in <<fopen>>.
22
23 RETURNS
24 File pointer or <<NULL>>, as for <<fopen>>.
25 */
26
27 #define _DEFAULT_SOURCE
28 #include <sys/types.h>
29 #include <sys/fcntl.h>
30
31 #include <stdio.h>
32 #include <errno.h>
33 #include <_syslist.h>
34 #include <sys/lock.h>
35 #include "../stdio/local.h"
36
37 FILE *
fdopen64(int fd,const char * mode)38 fdopen64 (
39 int fd,
40 const char *mode)
41 {
42 register FILE *fp;
43 int flags, oflags;
44 #ifdef _HAVE_FCNTL
45 int fdflags, fdmode;
46 #endif
47
48 if ((flags = __sflags (mode, &oflags)) == 0)
49 return 0;
50
51 /* make sure the mode the user wants is a subset of the actual mode */
52 #ifdef _HAVE_FCNTL
53 if ((fdflags = fcntl (fd, F_GETFL, 0)) < 0)
54 return 0;
55 fdmode = fdflags & O_ACCMODE;
56 if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE)))
57 {
58 _REENT_ERRNO(ptr) = EBADF;
59 return 0;
60 }
61 #endif
62
63 if ((fp = __sfp ()) == 0)
64 return 0;
65
66 _newlib_flockfile_start(fp);
67
68 fp->_flags = flags;
69 /* POSIX recommends setting the O_APPEND bit on fd to match append
70 streams. Someone may later clear O_APPEND on fileno(fp), but the
71 stream must still remain in append mode. Rely on __sflags
72 setting __SAPP properly. */
73 #ifdef _HAVE_FCNTL
74 if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
75 fcntl (fd, F_SETFL, fdflags | O_APPEND);
76 #endif
77 fp->_file = fd;
78 fp->_cookie = (void *) fp;
79
80 #undef _read
81 #undef _write
82 #undef _seek
83 #undef _close
84
85 fp->_read = __sread;
86 fp->_write = __swrite64;
87 fp->_seek = __sseek;
88 fp->_seek64 = __sseek64;
89 fp->_close = __sclose;
90
91 #ifdef __SCLE
92 /* Explicit given mode results in explicit setting mode on fd */
93 if (oflags & O_BINARY)
94 setmode(fp->_file, O_BINARY);
95 else if (oflags & O_TEXT)
96 setmode(fp->_file, O_TEXT);
97 if (__stextmode(fp->_file))
98 fp->_flags |= __SCLE;
99 #endif
100
101 fp->_flags |= __SL64;
102
103 _newlib_flockfile_end(fp);
104 return fp;
105 }
106
