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/* $OpenBSD: findfp.c,v 1.15 2013/12/17 16:33:27 deraadt Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <unistd.h>
#include "local.h"
#include "glue.h"
#include "private/thread_private.h"
#define ALIGNBYTES (sizeof(uintptr_t) - 1)
#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
#define NDYNAMIC 10 /* add ten more whenever necessary */
#define std(flags, file) \
{0,0,0,flags,file,{0,0},0,__sF+file,__sclose,__sread,__sseek,__swrite, \
{(unsigned char *)(__sFext+file), 0},NULL,0,{0},{0},{0,0},0,0}
_THREAD_PRIVATE_MUTEX(__sfp_mutex);
// TODO: when we no longer have to support both clang and GCC, we can simplify all this.
#define SBUF_INIT {0,0}
#if defined(__LP64__)
#define MBSTATE_T_INIT {{0},{0}}
#else
#define MBSTATE_T_INIT {{0}}
#endif
#define WCHAR_IO_DATA_INIT {MBSTATE_T_INIT,MBSTATE_T_INIT,{0},0,0}
static struct __sfileext __sFext[3] = {
{ SBUF_INIT, WCHAR_IO_DATA_INIT, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP, false },
{ SBUF_INIT, WCHAR_IO_DATA_INIT, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP, false },
{ SBUF_INIT, WCHAR_IO_DATA_INIT, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP, false },
};
// __sF is exported for backwards compatibility. Until M, we didn't have symbols
// for stdin/stdout/stderr; they were macros accessing __sF.
FILE __sF[3] = {
std(__SRD, STDIN_FILENO),
std(__SWR, STDOUT_FILENO),
std(__SWR|__SNBF, STDERR_FILENO),
};
FILE* stdin = &__sF[0];
FILE* stdout = &__sF[1];
FILE* stderr = &__sF[2];
struct glue __sglue = { NULL, 3, __sF };
static struct glue* lastglue = &__sglue;
static glue* moreglue(int n) {
static FILE empty;
char* data = new char[sizeof(glue) + ALIGNBYTES + n * sizeof(FILE) + n * sizeof(__sfileext)];
if (data == nullptr) return nullptr;
glue* g = reinterpret_cast<glue*>(data);
FILE* p = reinterpret_cast<FILE*>(ALIGN(data + sizeof(*g)));
__sfileext* pext = reinterpret_cast<__sfileext*>(ALIGN(data + sizeof(*g)) + n * sizeof(FILE));
g->next = NULL;
g->niobs = n;
g->iobs = p;
while (--n >= 0) {
*p = empty;
_FILEEXT_SETUP(p, pext);
p++;
pext++;
}
return g;
}
/*
* Find a free FILE for fopen et al.
*/
FILE* __sfp(void) {
FILE *fp;
int n;
struct glue *g;
_THREAD_PRIVATE_MUTEX_LOCK(__sfp_mutex);
for (g = &__sglue; g != NULL; g = g->next) {
for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
if (fp->_flags == 0)
goto found;
}
/* release lock while mallocing */
_THREAD_PRIVATE_MUTEX_UNLOCK(__sfp_mutex);
if ((g = moreglue(NDYNAMIC)) == NULL)
return (NULL);
_THREAD_PRIVATE_MUTEX_LOCK(__sfp_mutex);
lastglue->next = g;
lastglue = g;
fp = g->iobs;
found:
fp->_flags = 1; /* reserve this slot; caller sets real flags */
_THREAD_PRIVATE_MUTEX_UNLOCK(__sfp_mutex);
fp->_p = NULL; /* no current pointer */
fp->_w = 0; /* nothing to read or write */
fp->_r = 0;
fp->_bf._base = NULL; /* no buffer */
fp->_bf._size = 0;
fp->_lbfsize = 0; /* not line buffered */
fp->_file = -1; /* no file */
/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
fp->_lb._base = NULL; /* no line buffer */
fp->_lb._size = 0;
_FILEEXT_INIT(fp);
return (fp);
}
extern "C" __LIBC_HIDDEN__ void __libc_stdio_cleanup(void) {
/* (void) _fwalk(fclose); */
(void) _fwalk(__sflush); /* `cheating' */
}
int fclose(FILE* fp) {
if (fp->_flags == 0) {
// Already freed!
errno = EBADF;
return EOF;
}
FLOCKFILE(fp);
WCIO_FREE(fp);
int r = fp->_flags & __SWR ? __sflush(fp) : 0;
if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0) {
r = EOF;
}
if (fp->_flags & __SMBF) free(fp->_bf._base);
if (HASUB(fp)) FREEUB(fp);
if (HASLB(fp)) FREELB(fp);
// Poison this FILE so accesses after fclose will be obvious.
fp->_file = -1;
fp->_r = fp->_w = 0;
// Release this FILE for reuse.
fp->_flags = 0;
FUNLOCKFILE(fp);
return (r);
}
int fileno(FILE* fp) {
FLOCKFILE(fp);
int result = fileno_unlocked(fp);
FUNLOCKFILE(fp);
return result;
}
// Small standard I/O/seek/close functions.
// These maintain the `known seek offset' for seek optimisation.
int __sread(void* cookie, char* buf, int n) {
FILE* fp = reinterpret_cast<FILE*>(cookie);
int ret = TEMP_FAILURE_RETRY(read(fp->_file, buf, n));
// If the read succeeded, update the current offset.
if (ret >= 0) {
fp->_offset += ret;
} else {
fp->_flags &= ~__SOFF; // Paranoia.
}
return ret;
}
int __swrite(void* cookie, const char* buf, int n) {
FILE* fp = reinterpret_cast<FILE*>(cookie);
if (fp->_flags & __SAPP) {
(void) TEMP_FAILURE_RETRY(lseek(fp->_file, 0, SEEK_END));
}
fp->_flags &= ~__SOFF; // In case FAPPEND mode is set.
return TEMP_FAILURE_RETRY(write(fp->_file, buf, n));
}
// TODO: _FILE_OFFSET_BITS=64.
fpos_t __sseek(void* cookie, fpos_t offset, int whence) {
FILE* fp = reinterpret_cast<FILE*>(cookie);
off_t ret = TEMP_FAILURE_RETRY(lseek(fp->_file, offset, whence));
if (ret == -1) {
fp->_flags &= ~__SOFF;
} else {
fp->_flags |= __SOFF;
fp->_offset = ret;
}
return ret;
}
int __sclose(void* cookie) {
FILE* fp = reinterpret_cast<FILE*>(cookie);
return close(fp->_file);
}
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