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1 | /* Copyright (C) 1993-2021 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. | |
17 | ||
18 | As a special exception, if you link the code in this file with | |
19 | files compiled with a GNU compiler to produce an executable, | |
20 | that does not cause the resulting executable to be covered by | |
21 | the GNU Lesser General Public License. This exception does not | |
22 | however invalidate any other reasons why the executable file | |
23 | might be covered by the GNU Lesser General Public License. | |
24 | This exception applies to code released by its copyright holders | |
25 | in files containing the exception. */ | |
26 | ||
27 | #include "libioP.h" | |
28 | #include <fcntl.h> | |
29 | #include <stdlib.h> | |
30 | #include <stddef.h> | |
31 | #include <shlib-compat.h> | |
32 | ||
33 | FILE * | |
34 | __fopen_maybe_mmap (FILE *fp) | |
35 | { | |
36 | #if _G_HAVE_MMAP | |
37 | if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES)) | |
38 | { | |
39 | /* Since this is read-only, we might be able to mmap the contents | |
40 | directly. We delay the decision until the first read attempt by | |
41 | giving it a jump table containing functions that choose mmap or | |
42 | vanilla file operations and reset the jump table accordingly. */ | |
43 | ||
44 | if (fp->_mode <= 0) | |
45 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_maybe_mmap; | |
46 | else | |
47 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps_maybe_mmap; | |
48 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_maybe_mmap; | |
49 | } | |
50 | #endif | |
51 | return fp; | |
52 | } | |
53 | ||
54 | ||
55 | FILE * | |
56 | __fopen_internal (const char *filename, const char *mode, int is32) | |
57 | { | |
58 | struct locked_FILE | |
59 | { | |
60 | struct _IO_FILE_plus fp; | |
61 | #ifdef _IO_MTSAFE_IO | |
62 | _IO_lock_t lock; | |
63 | #endif | |
64 | struct _IO_wide_data wd; | |
65 | } *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
66 | ||
67 | if (new_f == NULL) | |
68 | return NULL; | |
69 | #ifdef _IO_MTSAFE_IO | |
70 | new_f->fp.file._lock = &new_f->lock; | |
71 | #endif | |
72 | _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps); | |
73 | _IO_JUMPS (&new_f->fp) = &_IO_file_jumps; | |
74 | _IO_new_file_init_internal (&new_f->fp); | |
75 | if (_IO_file_fopen ((FILE *) new_f, filename, mode, is32) != NULL) | |
76 | return __fopen_maybe_mmap (&new_f->fp.file); | |
77 | ||
78 | _IO_un_link (&new_f->fp); | |
79 | free (new_f); | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | FILE * | |
84 | _IO_new_fopen (const char *filename, const char *mode) | |
85 | { | |
86 | return __fopen_internal (filename, mode, 1); | |
87 | } | |
88 | ||
89 | strong_alias (_IO_new_fopen, __new_fopen) | |
90 | versioned_symbol (libc, _IO_new_fopen, _IO_fopen, GLIBC_2_1); | |
91 | versioned_symbol (libc, __new_fopen, fopen, GLIBC_2_1); | |
92 | ||
93 | # if !defined O_LARGEFILE || O_LARGEFILE == 0 | |
94 | weak_alias (_IO_new_fopen, _IO_fopen64) | |
95 | weak_alias (_IO_new_fopen, fopen64) | |
96 | # endif |