1 /*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 /*
19 FUNCTION
20 <<fopen64>>---open a large file
21
22 INDEX
23 fopen64
24 INDEX
25 _fopen64_r
26
27 SYNOPSIS
28 #include <stdio.h>
29 FILE *fopen64(const char *<[file]>, const char *<[mode]>);
30 FILE *_fopen64_r(void *<[reent]>,
31 const char *<[file]>, const char *<[mode]>);
32
33 DESCRIPTION
34 <<fopen64>> is identical to <<fopen>> except it opens a large file that
35 is potentially >2GB in size. See <<fopen>> for further details.
36
37 RETURNS
38 <<fopen64>> return a file pointer which you can use for other file
39 operations, unless the file you requested could not be opened; in that
40 situation, the result is <<NULL>>. If the reason for failure was an
41 invalid string at <[mode]>, <<errno>> is set to <<EINVAL>>.
42
43 PORTABILITY
44 <<fopen64>> is a glibc extension.
45
46 Supporting OS subroutines required: <<close>>, <<fstat64>>, <<isatty>>,
47 <<lseek64>>, <<open64>>, <<read>>, <<sbrk>>, <<write>>.
48 */
49
50 /* Copied from fopen.c */
51
52 #define _GNU_SOURCE
53 #include <stdio.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <sys/lock.h>
57 #include "../stdio/local.h"
58
59 #ifdef __LARGE64_FILES
60
61 FILE *
fopen64(const char * file,const char * mode)62 fopen64 (
63 const char *file,
64 const char *mode)
65 {
66 register FILE *fp;
67 register int f;
68 int flags, oflags;
69
70 if ((flags = __sflags (mode, &oflags)) == 0)
71 return NULL;
72 if ((fp = __sfp ()) == NULL)
73 return NULL;
74
75 if ((f = open64 (file, oflags, 0666)) < 0)
76 {
77 _newlib_sfp_lock_start ();
78 fp->_flags = 0; /* release */
79 #ifndef __SINGLE_THREAD__
80 __lock_close_recursive (fp->_lock);
81 #endif
82 _newlib_sfp_lock_end ();
83 return NULL;
84 }
85
86 _newlib_flockfile_start (fp);
87
88 fp->_file = f;
89 fp->_flags = flags;
90 fp->_cookie = (void *) fp;
91 fp->_read = __sread;
92 fp->_write = __swrite64;
93 fp->_seek = __sseek;
94 fp->_seek64 = __sseek64;
95 fp->_close = __sclose;
96
97 if (fp->_flags & __SAPP)
98 fseeko64 (fp, 0, SEEK_END);
99
100 #ifdef __SCLE
101 if (__stextmode (fp->_file))
102 fp->_flags |= __SCLE;
103 #endif
104
105 fp->_flags |= __SL64;
106
107 _newlib_flockfile_end (fp);
108 return fp;
109 }
110
111 #endif /* __LARGE64_FILES */
112
