| 1 | /*-␊ |
| 2 | * Copyright (c) 1990, 1993␊ |
| 3 | *␉The Regents of the University of California. All rights reserved.␊ |
| 4 | *␊ |
| 5 | * This code is derived from software contributed to Berkeley by␊ |
| 6 | * Chris Torek.␊ |
| 7 | *␊ |
| 8 | * Redistribution and use in source and binary forms, with or without␊ |
| 9 | * modification, are permitted provided that the following conditions␊ |
| 10 | * are met:␊ |
| 11 | * 1. Redistributions of source code must retain the above copyright␊ |
| 12 | * notice, this list of conditions and the following disclaimer.␊ |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
| 14 | * notice, this list of conditions and the following disclaimer in the␊ |
| 15 | * documentation and/or other materials provided with the distribution.␊ |
| 16 | * 4. Neither the name of the University nor the names of its contributors␊ |
| 17 | * may be used to endorse or promote products derived from this software␊ |
| 18 | * without specific prior written permission.␊ |
| 19 | *␊ |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
| 30 | * SUCH DAMAGE.␊ |
| 31 | */␊ |
| 32 | ␊ |
| 33 | #if defined(LIBC_SCCS) && !defined(lint)␊ |
| 34 | static char sccsid[] = "@(#)findfp.c␉8.2 (Berkeley) 1/4/94";␊ |
| 35 | #endif /* LIBC_SCCS and not lint */␊ |
| 36 | #include <sys/cdefs.h>␊ |
| 37 | //__FBSDID("$FreeBSD: src/lib/libc/stdio/findfp.c,v 1.34 2009/12/05 19:31:38 ed Exp $");␊ |
| 38 | ␊ |
| 39 | #include <TargetConditionals.h>␊ |
| 40 | #include "libsaio.h"␊ |
| 41 | ␊ |
| 42 | #include <sys/param.h>␊ |
| 43 | #include "stdio.h"␊ |
| 44 | #include "errno.h"␊ |
| 45 | #include "glue.h"␊ |
| 46 | ␊ |
| 47 | ␊ |
| 48 | #include "local.h"␊ |
| 49 | ␊ |
| 50 | int␉__sdidinit;␊ |
| 51 | void␉(*__cleanup)(void);␊ |
| 52 | ␊ |
| 53 | #define _PTHREAD_MUTEX_SIG_init␉␉0x32AAABA7␊ |
| 54 | #define PTHREAD_MUTEX_INITIALIZER {_PTHREAD_MUTEX_SIG_init, {0}}␊ |
| 55 | ␊ |
| 56 | ␊ |
| 57 | ␊ |
| 58 | #if !TARGET_OS_EMBEDDED␊ |
| 59 | #define␉NDYNAMIC 10␉␉/* add ten more whenever necessary */␊ |
| 60 | #else␊ |
| 61 | #define␉NDYNAMIC 1␉␉/* add one at a time on embedded */␊ |
| 62 | #endif␊ |
| 63 | ␊ |
| 64 | #define␉std(flags, file) {␉␉\␊ |
| 65 | ␉._flags = (flags),␉␉\␊ |
| 66 | ␉._file = (file),␉␉\␊ |
| 67 | ␉._cookie = __sF + (file),␉\␊ |
| 68 | ␉._close = __sclose,␉␉\␊ |
| 69 | ␉._read = __sread,␉␉\␊ |
| 70 | ␉._seek = __sseek,␉␉\␊ |
| 71 | ␉._write = __swrite,␉␉\␊ |
| 72 | ␉._extra = __sFX + file, \␊ |
| 73 | }␊ |
| 74 | #define __sFXInit {.fl_mutex = PTHREAD_MUTEX_INITIALIZER}␊ |
| 75 | /* set counted */␊ |
| 76 | #define __sFXInit3 {.fl_mutex = PTHREAD_MUTEX_INITIALIZER, .counted = 1}␊ |
| 77 | ␊ |
| 78 | //static int __scounted;␉␉/* streams counted against STREAM_MAX */␊ |
| 79 | //static int __stream_max;␊ |
| 80 | ␊ |
| 81 | #if !TARGET_OS_EMBEDDED␊ |
| 82 | /* usual and usual_extra are data pigs. See 7929728. For embedded we should␊ |
| 83 | * always allocate dynamically, and probably should for desktop too. */␊ |
| 84 | ␉␉␉␉/* the usual - (stdin + stdout + stderr) */␊ |
| 85 | static FILE usual[FOPEN_MAX - 3];␊ |
| 86 | static struct __sFILEX usual_extra[FOPEN_MAX - 3];␊ |
| 87 | static struct glue uglue = { NULL, FOPEN_MAX - 3, usual };␊ |
| 88 | #endif /* !TARGET_OS_EMBEDDED */␊ |
| 89 | ␊ |
| 90 | static struct __sFILEX __sFX[3] = {__sFXInit3, __sFXInit3, __sFXInit3};␊ |
| 91 | ␊ |
| 92 | /*␊ |
| 93 | * We can't make this 'static' due to binary compatibility concerns.␊ |
| 94 | * This also means we cannot change the sizeof(FILE) and must continue to␊ |
| 95 | * use the __sFILEX stuff to add to FILE.␊ |
| 96 | */␊ |
| 97 | FILE __sF[3] = {␊ |
| 98 | ␉std(__SRD, STDIN_FILENO),␊ |
| 99 | ␉std(__SWR, STDOUT_FILENO),␊ |
| 100 | ␉std(__SWR|__SNBF, STDERR_FILENO)␊ |
| 101 | };␊ |
| 102 | ␊ |
| 103 | FILE *__stdinp = &__sF[0];␊ |
| 104 | FILE *__stdoutp = &__sF[1];␊ |
| 105 | FILE *__stderrp = &__sF[2];␊ |
| 106 | ␊ |
| 107 | #if !TARGET_OS_EMBEDDED␊ |
| 108 | struct glue __sglue = { &uglue, 3, __sF };␊ |
| 109 | static struct glue *lastglue = &uglue;␊ |
| 110 | #else␊ |
| 111 | struct glue __sglue = { NULL, 3, __sF };␊ |
| 112 | static struct glue *lastglue = &__sglue;␊ |
| 113 | #endif␊ |
| 114 | ␊ |
| 115 | static struct glue *␉moreglue(int);␊ |
| 116 | ␊ |
| 117 | ␊ |
| 118 | #if NOT_YET␊ |
| 119 | #define␉SET_GLUE_PTR(ptr, val)␉atomic_set_rel_ptr(&(ptr), (uintptr_t)(val))␊ |
| 120 | #else␊ |
| 121 | #define␉SET_GLUE_PTR(ptr, val)␉ptr = val␊ |
| 122 | #endif␊ |
| 123 | ␊ |
| 124 | static struct glue *␊ |
| 125 | moreglue(n)␊ |
| 126 | ␉int n;␊ |
| 127 | {␊ |
| 128 | ␉struct glue *g;␊ |
| 129 | ␉static FILE empty;␊ |
| 130 | ␉FILE *p;␊ |
| 131 | ␉static struct __sFILEX emptyx = __sFXInit;␊ |
| 132 | ␉struct __sFILEX *fx;␊ |
| 133 | ␊ |
| 134 | ␉g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE) +␊ |
| 135 | ␉ n * sizeof(struct __sFILEX));␊ |
| 136 | ␉if (g == NULL)␊ |
| 137 | ␉␉return (NULL);␊ |
| 138 | ␉p = (FILE *)ALIGN(g + 1);␊ |
| 139 | ␉fx = (struct __sFILEX *)&p[n];␊ |
| 140 | ␉g->next = NULL;␊ |
| 141 | ␉g->niobs = n;␊ |
| 142 | ␉g->iobs = p;␊ |
| 143 | ␊ |
| 144 | ␉while (--n >= 0) {␊ |
| 145 | ␉␉*p = empty;␊ |
| 146 | ␉␉p->_extra = fx;␊ |
| 147 | ␉␉*p->_extra = emptyx;␊ |
| 148 | ␉␉p++, fx++;␊ |
| 149 | ␉}␊ |
| 150 | ␉return (g);␊ |
| 151 | }␊ |
| 152 | ␊ |
| 153 | /*␊ |
| 154 | * Find a free FILE for fopen et al.␊ |
| 155 | */␊ |
| 156 | FILE *␊ |
| 157 | __sfp(int count)␊ |
| 158 | {␊ |
| 159 | ␉FILE␉*fp;␊ |
| 160 | ␉int␉n;␊ |
| 161 | ␉struct glue *g;␊ |
| 162 | ␊ |
| 163 | ␉if (!__sdidinit)␊ |
| 164 | ␉␉__sinit();␊ |
| 165 | ␊ |
| 166 | ␉/*if (count) {␊ |
| 167 | ␉␉if (__scounted >= __stream_max) {␊ |
| 168 | set_errno(EMFILE);␊ |
| 169 | ␉␉␉return NULL;␊ |
| 170 | ␉␉}␊ |
| 171 | ␉␉//OSAtomicIncrement32(&__scounted);␊ |
| 172 | __scounted++;␊ |
| 173 | ␉}*/␊ |
| 174 | ␉/*␊ |
| 175 | ␉ * The list must be locked because a FILE may be updated.␊ |
| 176 | ␉ */␊ |
| 177 | ␉for (g = &__sglue; g != NULL; g = g->next) {␊ |
| 178 | ␉␉for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)␊ |
| 179 | ␉␉␉if (fp->_flags == 0)␊ |
| 180 | ␉␉␉␉goto found;␊ |
| 181 | ␉}␊ |
| 182 | ␉if ((g = moreglue(NDYNAMIC)) == NULL)␊ |
| 183 | ␉␉return (NULL);␊ |
| 184 | ␉SET_GLUE_PTR(lastglue->next, g); /* atomically append glue to list */␊ |
| 185 | ␉lastglue = g;␉␉/* not atomic; only accessed when locked */␊ |
| 186 | ␉fp = g->iobs;␊ |
| 187 | found:␊ |
| 188 | ␉fp->_flags = 1;␉␉/* reserve this slot; caller sets real flags */␊ |
| 189 | ␉fp->_p = NULL;␉␉/* no current pointer */␊ |
| 190 | ␉fp->_w = 0;␉␉/* nothing to read or write */␊ |
| 191 | ␉fp->_r = 0;␊ |
| 192 | ␉fp->_bf._base = NULL;␉/* no buffer */␊ |
| 193 | ␉fp->_bf._size = 0;␊ |
| 194 | ␉fp->_lbfsize = 0;␉/* not line buffered */␊ |
| 195 | ␉fp->_file = -1;␉␉/* no file */␊ |
| 196 | /*␉fp->_cookie = <any>; */␉/* caller sets cookie, _read/_write etc */␊ |
| 197 | ␉fp->_ub._base = NULL;␉/* no ungetc buffer */␊ |
| 198 | ␉fp->_ub._size = 0;␊ |
| 199 | ␉fp->_lb._base = NULL;␉/* no line buffer */␊ |
| 200 | ␉fp->_lb._size = 0;␊ |
| 201 | /*␉fp->_lock = NULL; */␉/* once set always set (reused) */␊ |
| 202 | ␉INITEXTRA(fp);␊ |
| 203 | ␉fp->_extra->counted = count ? 1 : 0;␊ |
| 204 | ␉return (fp);␊ |
| 205 | }␊ |
| 206 | ␊ |
| 207 | /*␊ |
| 208 | * Mark as free and update count as needed␊ |
| 209 | */␊ |
| 210 | __private_extern__ void␊ |
| 211 | __sfprelease(FILE *fp)␊ |
| 212 | {␊ |
| 213 | ␉if (fp->_counted) {␊ |
| 214 | ␉␉//OSAtomicDecrement32(&__scounted);␊ |
| 215 | //__scounted--;␊ |
| 216 | ␉␉fp->_counted = 0;␊ |
| 217 | ␉}␊ |
| 218 | ␉fp->_flags = 0;␊ |
| 219 | }␊ |
| 220 | ␊ |
| 221 | /*␊ |
| 222 | * exit() calls _cleanup() through *__cleanup, set whenever we␊ |
| 223 | * open or buffer a file. This chicanery is done so that programs␊ |
| 224 | * that do not use stdio need not link it all in.␊ |
| 225 | *␊ |
| 226 | * The name `_cleanup' is, alas, fairly well known outside stdio.␊ |
| 227 | */␊ |
| 228 | ␊ |
| 229 | void␊ |
| 230 | _cleanup()␊ |
| 231 | {␊ |
| 232 | ␉/* (void) _fwalk(fclose); */␊ |
| 233 | ␉ (void) _fwalk(__sflush);␉␉/* `cheating' */␊ |
| 234 | }␊ |
| 235 | ␊ |
| 236 | /*␊ |
| 237 | * __sinit() is called whenever stdio's internal variables must be set up.␊ |
| 238 | */␊ |
| 239 | void␊ |
| 240 | __sinit()␊ |
| 241 | {␊ |
| 242 | ␉if (__sdidinit == 0) {␊ |
| 243 | #if !TARGET_OS_EMBEDDED␊ |
| 244 | ␉␉int i;␊ |
| 245 | #endif␊ |
| 246 | ␉␉/* Make sure we clean up on exit. */␊ |
| 247 | ␉␉__cleanup = _cleanup;␉␉/* conservative */␊ |
| 248 | ␉␉//__stream_max = 9;␊ |
| 249 | ␉␉//__scounted = 3;␉␉␉/* std{in,out,err} already exists */␊ |
| 250 | ␊ |
| 251 | #if !TARGET_OS_EMBEDDED␊ |
| 252 | ␉␉/* Set _extra for the usual suspects. */␊ |
| 253 | ␉␉for (i = 0; i < FOPEN_MAX - 3; i++) {␊ |
| 254 | ␉␉␉usual[i]._extra = &usual_extra[i];␊ |
| 255 | ␉␉␉INITEXTRA(&usual[i]);␊ |
| 256 | ␉␉}␊ |
| 257 | #endif␊ |
| 258 | ␊ |
| 259 | ␉␉__sdidinit = 1;␊ |
| 260 | ␉}␊ |
| 261 | }␊ |
| 262 | |
