[444] | 1 | /* |
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| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | /* No user fns here. Pesch 15apr92. */ |
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| 18 | |
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| 19 | #include <_ansi.h> |
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| 20 | #include <reent.h> |
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| 21 | #include <stdio.h> |
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| 22 | #include <stdlib.h> |
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| 23 | #include <errno.h> |
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| 24 | #include <string.h> |
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| 25 | #include <fcntl.h> |
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| 26 | #include <sys/lock.h> |
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| 27 | #include "local.h" |
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| 28 | |
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| 29 | #ifdef _REENT_SMALL |
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| 30 | const struct __sFILE_fake __sf_fake_stdin = |
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| 31 | {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; |
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| 32 | const struct __sFILE_fake __sf_fake_stdout = |
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| 33 | {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; |
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| 34 | const struct __sFILE_fake __sf_fake_stderr = |
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| 35 | {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; |
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| 36 | #endif |
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| 37 | |
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| 38 | #ifdef _REENT_GLOBAL_STDIO_STREAMS |
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| 39 | __FILE __sf[3]; |
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| 40 | #endif |
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| 41 | |
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| 42 | #if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED)) |
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| 43 | _NOINLINE_STATIC void |
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| 44 | #else |
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| 45 | static void |
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| 46 | #endif |
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| 47 | std (FILE *ptr, |
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| 48 | int flags, |
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| 49 | int file) |
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| 50 | { |
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| 51 | ptr->_p = 0; |
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| 52 | ptr->_r = 0; |
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| 53 | ptr->_w = 0; |
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| 54 | ptr->_flags = flags; |
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| 55 | ptr->_flags2 = 0; |
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| 56 | ptr->_file = file; |
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| 57 | ptr->_bf._base = 0; |
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| 58 | ptr->_bf._size = 0; |
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| 59 | ptr->_lbfsize = 0; |
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| 60 | memset (&ptr->_mbstate, 0, sizeof (_mbstate_t)); |
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| 61 | ptr->_cookie = ptr; |
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| 62 | ptr->_read = __sread; |
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| 63 | #ifndef __LARGE64_FILES |
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| 64 | ptr->_write = __swrite; |
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| 65 | #else /* __LARGE64_FILES */ |
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| 66 | ptr->_write = __swrite64; |
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| 67 | ptr->_seek64 = __sseek64; |
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| 68 | ptr->_flags |= __SL64; |
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| 69 | #endif /* __LARGE64_FILES */ |
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| 70 | ptr->_seek = __sseek; |
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| 71 | #ifdef _STDIO_CLOSE_PER_REENT_STD_STREAMS |
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| 72 | ptr->_close = __sclose; |
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| 73 | #else /* _STDIO_CLOSE_STD_STREAMS */ |
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| 74 | ptr->_close = NULL; |
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| 75 | #endif /* _STDIO_CLOSE_STD_STREAMS */ |
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| 76 | #if !defined(__SINGLE_THREAD__) && !defined(_REENT_SMALL) |
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| 77 | __lock_init_recursive (ptr->_lock); |
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| 78 | /* |
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| 79 | * #else |
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| 80 | * lock is already initialized in __sfp |
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| 81 | */ |
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| 82 | #endif |
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| 83 | |
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| 84 | #ifdef __SCLE |
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| 85 | if (__stextmode (ptr->_file)) |
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| 86 | ptr->_flags |= __SCLE; |
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| 87 | #endif |
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| 88 | } |
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| 89 | |
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| 90 | static inline void |
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| 91 | stdin_init(FILE *ptr) |
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| 92 | { |
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| 93 | std (ptr, __SRD, 0); |
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| 94 | } |
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| 95 | |
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| 96 | static inline void |
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| 97 | stdout_init(FILE *ptr) |
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| 98 | { |
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| 99 | /* On platforms that have true file system I/O, we can verify |
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| 100 | whether stdout is an interactive terminal or not, as part of |
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| 101 | __smakebuf on first use of the stream. For all other platforms, |
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| 102 | we will default to line buffered mode here. Technically, POSIX |
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| 103 | requires both stdin and stdout to be line-buffered, but tradition |
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| 104 | leaves stdin alone on systems without fcntl. */ |
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| 105 | #ifdef HAVE_FCNTL |
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| 106 | std (ptr, __SWR, 1); |
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| 107 | #else |
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| 108 | std (ptr, __SWR | __SLBF, 1); |
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| 109 | #endif |
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| 110 | } |
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| 111 | |
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| 112 | static inline void |
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| 113 | stderr_init(FILE *ptr) |
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| 114 | { |
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| 115 | /* POSIX requires stderr to be opened for reading and writing, even |
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| 116 | when the underlying fd 2 is write-only. */ |
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| 117 | std (ptr, __SRW | __SNBF, 2); |
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| 118 | } |
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| 119 | |
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| 120 | struct glue_with_file { |
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| 121 | struct _glue glue; |
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| 122 | FILE file; |
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| 123 | }; |
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| 124 | |
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| 125 | struct _glue * |
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| 126 | __sfmoreglue (struct _reent *d, |
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| 127 | register int n) |
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| 128 | { |
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| 129 | struct glue_with_file *g; |
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| 130 | |
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| 131 | g = (struct glue_with_file *) |
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| 132 | _malloc_r (d, sizeof (*g) + (n - 1) * sizeof (FILE)); |
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| 133 | if (g == NULL) |
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| 134 | return NULL; |
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| 135 | g->glue._next = NULL; |
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| 136 | g->glue._niobs = n; |
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| 137 | g->glue._iobs = &g->file; |
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| 138 | memset (&g->file, 0, n * sizeof (FILE)); |
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| 139 | return &g->glue; |
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| 140 | } |
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| 141 | |
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| 142 | /* |
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| 143 | * Find a free FILE for fopen et al. |
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| 144 | */ |
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| 145 | |
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| 146 | FILE * |
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| 147 | __sfp (struct _reent *d) |
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| 148 | { |
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| 149 | FILE *fp; |
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| 150 | int n; |
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| 151 | struct _glue *g; |
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| 152 | |
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| 153 | _newlib_sfp_lock_start (); |
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| 154 | |
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| 155 | if (!_GLOBAL_REENT->__sdidinit) |
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| 156 | __sinit (_GLOBAL_REENT); |
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| 157 | for (g = &_GLOBAL_REENT->__sglue;; g = g->_next) |
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| 158 | { |
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| 159 | for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++) |
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| 160 | if (fp->_flags == 0) |
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| 161 | goto found; |
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| 162 | if (g->_next == NULL && |
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| 163 | (g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL) |
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| 164 | break; |
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| 165 | } |
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| 166 | _newlib_sfp_lock_exit (); |
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| 167 | d->_errno = ENOMEM; |
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| 168 | return NULL; |
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| 169 | |
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| 170 | found: |
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| 171 | fp->_file = -1; /* no file */ |
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| 172 | fp->_flags = 1; /* reserve this slot; caller sets real flags */ |
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| 173 | fp->_flags2 = 0; |
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| 174 | #ifndef __SINGLE_THREAD__ |
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| 175 | __lock_init_recursive (fp->_lock); |
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| 176 | #endif |
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| 177 | _newlib_sfp_lock_end (); |
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| 178 | |
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| 179 | fp->_p = NULL; /* no current pointer */ |
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| 180 | fp->_w = 0; /* nothing to read or write */ |
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| 181 | fp->_r = 0; |
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| 182 | fp->_bf._base = NULL; /* no buffer */ |
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| 183 | fp->_bf._size = 0; |
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| 184 | fp->_lbfsize = 0; /* not line buffered */ |
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| 185 | memset (&fp->_mbstate, 0, sizeof (_mbstate_t)); |
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| 186 | /* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */ |
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| 187 | fp->_ub._base = NULL; /* no ungetc buffer */ |
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| 188 | fp->_ub._size = 0; |
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| 189 | fp->_lb._base = NULL; /* no line buffer */ |
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| 190 | fp->_lb._size = 0; |
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| 191 | |
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| 192 | return fp; |
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| 193 | } |
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| 194 | |
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| 195 | /* |
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| 196 | * exit() calls _cleanup() through *__cleanup, set whenever we |
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| 197 | * open or buffer a file. This chicanery is done so that programs |
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| 198 | * that do not use stdio need not link it all in. |
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| 199 | * |
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| 200 | * The name `_cleanup' is, alas, fairly well known outside stdio. |
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| 201 | */ |
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| 202 | |
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| 203 | void |
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| 204 | _cleanup_r (struct _reent *ptr) |
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| 205 | { |
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| 206 | int (*cleanup_func) (struct _reent *, FILE *); |
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| 207 | #ifdef _STDIO_BSD_SEMANTICS |
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| 208 | /* BSD and Glibc systems only flush streams which have been written to |
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| 209 | at exit time. Calling flush rather than close for speed, as on |
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| 210 | the aforementioned systems. */ |
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| 211 | cleanup_func = __sflushw_r; |
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| 212 | #else |
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| 213 | /* Otherwise close files and flush read streams, too. |
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| 214 | Note we call flush directly if "--enable-lite-exit" is in effect. */ |
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| 215 | #ifdef _LITE_EXIT |
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| 216 | cleanup_func = _fflush_r; |
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| 217 | #else |
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| 218 | cleanup_func = _fclose_r; |
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| 219 | #endif |
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| 220 | #endif |
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| 221 | #ifdef _REENT_GLOBAL_STDIO_STREAMS |
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| 222 | if (ptr->_stdin != &__sf[0]) |
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| 223 | (*cleanup_func) (ptr, ptr->_stdin); |
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| 224 | if (ptr->_stdout != &__sf[1]) |
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| 225 | (*cleanup_func) (ptr, ptr->_stdout); |
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| 226 | if (ptr->_stderr != &__sf[2]) |
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| 227 | (*cleanup_func) (ptr, ptr->_stderr); |
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| 228 | #endif |
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| 229 | (void) _fwalk_reent (ptr, cleanup_func); |
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| 230 | } |
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| 231 | |
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| 232 | #ifndef _REENT_ONLY |
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| 233 | void |
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| 234 | _cleanup (void) |
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| 235 | { |
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| 236 | _cleanup_r (_GLOBAL_REENT); |
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| 237 | } |
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| 238 | #endif |
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| 239 | |
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| 240 | /* |
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| 241 | * __sinit() is called whenever stdio's internal variables must be set up. |
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| 242 | */ |
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| 243 | |
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| 244 | void |
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| 245 | __sinit (struct _reent *s) |
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| 246 | { |
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| 247 | __sinit_lock_acquire (); |
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| 248 | |
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| 249 | if (s->__sdidinit) |
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| 250 | { |
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| 251 | __sinit_lock_release (); |
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| 252 | return; |
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| 253 | } |
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| 254 | |
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| 255 | /* make sure we clean up on exit */ |
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| 256 | s->__cleanup = _cleanup_r; /* conservative */ |
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| 257 | |
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| 258 | s->__sglue._next = NULL; |
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| 259 | #ifndef _REENT_SMALL |
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| 260 | # ifndef _REENT_GLOBAL_STDIO_STREAMS |
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| 261 | s->__sglue._niobs = 3; |
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| 262 | s->__sglue._iobs = &s->__sf[0]; |
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| 263 | # endif |
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| 264 | #else |
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| 265 | s->__sglue._niobs = 0; |
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| 266 | s->__sglue._iobs = NULL; |
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| 267 | /* Avoid infinite recursion when calling __sfp for _GLOBAL_REENT. The |
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| 268 | problem is that __sfp checks for _GLOBAL_REENT->__sdidinit and calls |
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| 269 | __sinit if it's 0. */ |
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| 270 | if (s == _GLOBAL_REENT) |
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| 271 | s->__sdidinit = 1; |
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| 272 | s->_stdin = __sfp(s); |
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| 273 | s->_stdout = __sfp(s); |
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| 274 | s->_stderr = __sfp(s); |
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| 275 | #endif |
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| 276 | |
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| 277 | #ifdef _REENT_GLOBAL_STDIO_STREAMS |
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| 278 | if (__sf[0]._cookie == NULL) { |
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| 279 | _GLOBAL_REENT->__sglue._niobs = 3; |
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| 280 | _GLOBAL_REENT->__sglue._iobs = &__sf[0]; |
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| 281 | stdin_init (&__sf[0]); |
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| 282 | stdout_init (&__sf[1]); |
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| 283 | stderr_init (&__sf[2]); |
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| 284 | } |
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| 285 | #else |
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| 286 | stdin_init (s->_stdin); |
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| 287 | stdout_init (s->_stdout); |
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| 288 | stderr_init (s->_stderr); |
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| 289 | #endif |
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| 290 | |
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| 291 | s->__sdidinit = 1; |
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| 292 | |
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| 293 | __sinit_lock_release (); |
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| 294 | } |
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| 295 | |
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| 296 | #ifndef __SINGLE_THREAD__ |
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| 297 | |
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| 298 | __LOCK_INIT_RECURSIVE(static, __sfp_recursive_mutex); |
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| 299 | __LOCK_INIT_RECURSIVE(static, __sinit_recursive_mutex); |
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| 300 | |
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| 301 | void |
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| 302 | __sfp_lock_acquire (void) |
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| 303 | { |
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| 304 | __lock_acquire_recursive (__sfp_recursive_mutex); |
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| 305 | } |
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| 306 | |
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| 307 | void |
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| 308 | __sfp_lock_release (void) |
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| 309 | { |
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| 310 | __lock_release_recursive (__sfp_recursive_mutex); |
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| 311 | } |
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| 312 | |
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| 313 | void |
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| 314 | __sinit_lock_acquire (void) |
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| 315 | { |
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| 316 | __lock_acquire_recursive (__sinit_recursive_mutex); |
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| 317 | } |
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| 318 | |
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| 319 | void |
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| 320 | __sinit_lock_release (void) |
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| 321 | { |
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| 322 | __lock_release_recursive (__sinit_recursive_mutex); |
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| 323 | } |
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| 324 | |
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| 325 | /* Walkable file locking routine. */ |
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| 326 | static int |
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| 327 | __fp_lock (FILE * ptr) |
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| 328 | { |
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| 329 | if (!(ptr->_flags2 & __SNLK)) |
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| 330 | _flockfile (ptr); |
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| 331 | |
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| 332 | return 0; |
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| 333 | } |
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| 334 | |
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| 335 | /* Walkable file unlocking routine. */ |
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| 336 | static int |
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| 337 | __fp_unlock (FILE * ptr) |
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| 338 | { |
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| 339 | if (!(ptr->_flags2 & __SNLK)) |
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| 340 | _funlockfile (ptr); |
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| 341 | |
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| 342 | return 0; |
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| 343 | } |
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| 344 | |
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| 345 | void |
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| 346 | __fp_lock_all (void) |
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| 347 | { |
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| 348 | __sfp_lock_acquire (); |
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| 349 | |
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| 350 | (void) _fwalk (_REENT, __fp_lock); |
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| 351 | } |
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| 352 | |
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| 353 | void |
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| 354 | __fp_unlock_all (void) |
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| 355 | { |
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| 356 | (void) _fwalk (_REENT, __fp_unlock); |
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| 357 | |
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| 358 | __sfp_lock_release (); |
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| 359 | } |
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| 360 | #endif |
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