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 #if defined(LIBC_SCCS) && !defined(lint)
53 static char sccsid[] = "%W% (Berkeley) %G%";
54 #endif /* LIBC_SCCS and not lint */
55
56 #define _DEFAULT_SOURCE
57 #include <stdio.h>
58 #include <errno.h>
59 #include <fcntl.h>
60 #include <sys/lock.h>
61 #include "../stdio/local.h"
62
63 #ifdef __LARGE64_FILES
64
65 FILE *
fopen64(const char * file,const char * mode)66 fopen64 (
67 const char *file,
68 const char *mode)
69 {
70 register FILE *fp;
71 register int f;
72 int flags, oflags;
73
74 if ((flags = __sflags (mode, &oflags)) == 0)
75 return NULL;
76 if ((fp = __sfp ()) == NULL)
77 return NULL;
78
79 if ((f = open64 (file, oflags, 0666)) < 0)
80 {
81 _newlib_sfp_lock_start ();
82 fp->_flags = 0; /* release */
83 #ifndef __SINGLE_THREAD__
84 __lock_close_recursive (fp->_lock);
85 #endif
86 _newlib_sfp_lock_end ();
87 return NULL;
88 }
89
90 _newlib_flockfile_start (fp);
91
92 fp->_file = f;
93 fp->_flags = flags;
94 fp->_cookie = (void *) fp;
95 fp->_read = __sread;
96 fp->_write = __swrite64;
97 fp->_seek = __sseek;
98 fp->_seek64 = __sseek64;
99 fp->_close = __sclose;
100
101 if (fp->_flags & __SAPP)
102 fseeko64 (fp, 0, SEEK_END);
103
104 #ifdef __SCLE
105 if (__stextmode (fp->_file))
106 fp->_flags |= __SCLE;
107 #endif
108
109 fp->_flags |= __SL64;
110
111 _newlib_flockfile_end (fp);
112 return fp;
113 }
114
115 #endif /* __LARGE64_FILES */
116
