diff options
Diffstat (limited to 'lib/libc/stdio/findfp.c')
| -rw-r--r-- | lib/libc/stdio/findfp.c | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/lib/libc/stdio/findfp.c b/lib/libc/stdio/findfp.c deleted file mode 100644 index 89c0536..0000000 --- a/lib/libc/stdio/findfp.c +++ /dev/null @@ -1,217 +0,0 @@ -/*- - * 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. - * 4. 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. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -static char sccsid[] = "@(#)findfp.c 8.2 (Berkeley) 1/4/94"; -#endif /* LIBC_SCCS and not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/param.h> -#include <machine/atomic.h> -#include <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include <spinlock.h> - -#include "libc_private.h" -#include "local.h" -#include "glue.h" - -int __sdidinit; - -#define NDYNAMIC 10 /* add ten more whenever necessary */ - -#define std(flags, file) { \ - ._flags = (flags), \ - ._file = (file), \ - ._cookie = __sF + (file), \ - ._close = __sclose, \ - ._read = __sread, \ - ._seek = __sseek, \ - ._write = __swrite, \ - ._fl_mutex = PTHREAD_MUTEX_INITIALIZER, \ -} - /* the usual - (stdin + stdout + stderr) */ -static FILE usual[FOPEN_MAX - 3]; -static struct glue uglue = { NULL, FOPEN_MAX - 3, usual }; - -static FILE __sF[3] = { - std(__SRD, STDIN_FILENO), - std(__SWR, STDOUT_FILENO), - std(__SWR|__SNBF, STDERR_FILENO) -}; - -FILE *__stdinp = &__sF[0]; -FILE *__stdoutp = &__sF[1]; -FILE *__stderrp = &__sF[2]; - -struct glue __sglue = { &uglue, 3, __sF }; -static struct glue *lastglue = &uglue; - -static struct glue * moreglue(int); - -static spinlock_t thread_lock = _SPINLOCK_INITIALIZER; -#define THREAD_LOCK() if (__isthreaded) _SPINLOCK(&thread_lock) -#define THREAD_UNLOCK() if (__isthreaded) _SPINUNLOCK(&thread_lock) - -#if NOT_YET -#define SET_GLUE_PTR(ptr, val) atomic_set_rel_ptr(&(ptr), (uintptr_t)(val)) -#else -#define SET_GLUE_PTR(ptr, val) ptr = val -#endif - -static struct glue * -moreglue(n) - int n; -{ - struct glue *g; - static FILE empty = { ._fl_mutex = PTHREAD_MUTEX_INITIALIZER }; - FILE *p; - - g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE)); - if (g == NULL) - return (NULL); - p = (FILE *)ALIGN(g + 1); - g->next = NULL; - g->niobs = n; - g->iobs = p; - while (--n >= 0) - *p++ = empty; - return (g); -} - -/* - * Find a free FILE for fopen et al. - */ -FILE * -__sfp() -{ - FILE *fp; - int n; - struct glue *g; - - if (!__sdidinit) - __sinit(); - /* - * The list must be locked because a FILE may be updated. - */ - THREAD_LOCK(); - for (g = &__sglue; g != NULL; g = g->next) { - for (fp = g->iobs, n = g->niobs; --n >= 0; fp++) - if (fp->_flags == 0) - goto found; - } - THREAD_UNLOCK(); /* don't hold lock while malloc()ing. */ - if ((g = moreglue(NDYNAMIC)) == NULL) - return (NULL); - THREAD_LOCK(); /* reacquire the lock */ - SET_GLUE_PTR(lastglue->next, g); /* atomically append glue to list */ - lastglue = g; /* not atomic; only accessed when locked */ - fp = g->iobs; -found: - fp->_flags = 1; /* reserve this slot; caller sets real flags */ - THREAD_UNLOCK(); - 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->_ub._base = NULL; /* no ungetc buffer */ - fp->_ub._size = 0; - fp->_lb._base = NULL; /* no line buffer */ - fp->_lb._size = 0; -/* fp->_fl_mutex = NULL; */ /* once set always set (reused) */ - fp->_orientation = 0; - memset(&fp->_mbstate, 0, sizeof(mbstate_t)); - return (fp); -} - -/* - * XXX. Force immediate allocation of internal memory. Not used by stdio, - * but documented historically for certain applications. Bad applications. - */ -__warn_references(f_prealloc, - "warning: this program uses f_prealloc(), which is not recommended."); - -void -f_prealloc(void) -{ - struct glue *g; - int n; - - n = getdtablesize() - FOPEN_MAX + 20; /* 20 for slop. */ - /* - * It should be safe to walk the list without locking it; - * new nodes are only added to the end and none are ever - * removed. - */ - for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next) - /* void */; - if ((n > 0) && ((g = moreglue(n)) != NULL)) { - THREAD_LOCK(); - SET_GLUE_PTR(lastglue->next, g); - lastglue = g; - THREAD_UNLOCK(); - } -} - -/* - * exit() calls _cleanup() through *__cleanup, set whenever we - * open or buffer a file. This chicanery is done so that programs - * that do not use stdio need not link it all in. - * - * The name `_cleanup' is, alas, fairly well known outside stdio. - */ -void -_cleanup() -{ - /* (void) _fwalk(fclose); */ - (void) _fwalk(__sflush); /* `cheating' */ -} - -/* - * __sinit() is called whenever stdio's internal variables must be set up. - */ -void -__sinit() -{ - - /* Make sure we clean up on exit. */ - __cleanup = _cleanup; /* conservative */ - __sdidinit = 1; -} |
