351 lines
8.3 KiB
C
351 lines
8.3 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* and/or other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* No user fns here. Pesch 15apr92. */
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/lock.h>
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#include "local.h"
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#if defined(_REENT_SMALL) && !defined(_REENT_GLOBAL_STDIO_STREAMS)
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const struct __sFILE_fake __sf_fake_stdin =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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const struct __sFILE_fake __sf_fake_stdout =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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const struct __sFILE_fake __sf_fake_stderr =
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{_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL};
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#endif
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#ifdef _REENT_GLOBAL_STDIO_STREAMS
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__FILE __sf[3];
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#endif
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#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
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_NOINLINE_STATIC void
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#else
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static void
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#endif
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std (FILE *ptr,
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int flags,
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int file)
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{
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ptr->_p = 0;
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ptr->_r = 0;
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ptr->_w = 0;
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ptr->_flags = flags;
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ptr->_flags2 = 0;
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ptr->_file = file;
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ptr->_bf._base = 0;
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ptr->_bf._size = 0;
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ptr->_lbfsize = 0;
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memset (&ptr->_mbstate, 0, sizeof (_mbstate_t));
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ptr->_cookie = ptr;
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ptr->_read = __sread;
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#ifndef __LARGE64_FILES
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ptr->_write = __swrite;
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#else /* __LARGE64_FILES */
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ptr->_write = __swrite64;
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ptr->_seek64 = __sseek64;
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ptr->_flags |= __SL64;
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#endif /* __LARGE64_FILES */
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ptr->_seek = __sseek;
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#ifdef _STDIO_CLOSE_PER_REENT_STD_STREAMS
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ptr->_close = __sclose;
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#else /* _STDIO_CLOSE_STD_STREAMS */
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ptr->_close = NULL;
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#endif /* _STDIO_CLOSE_STD_STREAMS */
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#if !defined(__SINGLE_THREAD__) && !(defined(_REENT_SMALL) && !defined(_REENT_GLOBAL_STDIO_STREAMS))
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__lock_init_recursive (ptr->_lock);
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/*
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* #else
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* lock is already initialized in __sfp
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*/
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#endif
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#ifdef __SCLE
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if (__stextmode (ptr->_file))
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ptr->_flags |= __SCLE;
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#endif
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}
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static inline void
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stdin_init(FILE *ptr)
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{
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std (ptr, __SRD, 0);
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}
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static inline void
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stdout_init(FILE *ptr)
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{
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/* On platforms that have true file system I/O, we can verify
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whether stdout is an interactive terminal or not, as part of
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__smakebuf on first use of the stream. For all other platforms,
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we will default to line buffered mode here. Technically, POSIX
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requires both stdin and stdout to be line-buffered, but tradition
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leaves stdin alone on systems without fcntl. */
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#ifdef HAVE_FCNTL
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std (ptr, __SWR, 1);
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#else
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std (ptr, __SWR | __SLBF, 1);
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#endif
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}
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static inline void
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stderr_init(FILE *ptr)
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{
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/* POSIX requires stderr to be opened for reading and writing, even
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when the underlying fd 2 is write-only. */
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std (ptr, __SRW | __SNBF, 2);
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}
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struct glue_with_file {
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struct _glue glue;
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FILE file;
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};
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static struct _glue *
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sfmoreglue (struct _reent *d, int n)
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{
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struct glue_with_file *g;
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g = (struct glue_with_file *)
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_malloc_r (d, sizeof (*g) + (n - 1) * sizeof (FILE));
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if (g == NULL)
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return NULL;
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g->glue._next = NULL;
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g->glue._niobs = n;
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g->glue._iobs = &g->file;
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memset (&g->file, 0, n * sizeof (FILE));
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return &g->glue;
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}
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/*
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* Find a free FILE for fopen et al.
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*/
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FILE *
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__sfp (struct _reent *d)
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{
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FILE *fp;
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int n;
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struct _glue *g;
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_newlib_sfp_lock_start ();
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if (_GLOBAL_REENT->__cleanup == NULL)
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__sinit (_GLOBAL_REENT);
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for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)
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{
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for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
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if (fp->_flags == 0)
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goto found;
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if (g->_next == NULL &&
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(g->_next = sfmoreglue (d, NDYNAMIC)) == NULL)
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break;
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}
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_newlib_sfp_lock_exit ();
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d->_errno = ENOMEM;
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return NULL;
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found:
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fp->_file = -1; /* no file */
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fp->_flags = 1; /* reserve this slot; caller sets real flags */
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fp->_flags2 = 0;
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#ifndef __SINGLE_THREAD__
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__lock_init_recursive (fp->_lock);
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#endif
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_newlib_sfp_lock_end ();
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fp->_p = NULL; /* no current pointer */
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fp->_w = 0; /* nothing to read or write */
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fp->_r = 0;
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fp->_bf._base = NULL; /* no buffer */
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fp->_bf._size = 0;
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fp->_lbfsize = 0; /* not line buffered */
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memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
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/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
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fp->_ub._base = NULL; /* no ungetc buffer */
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fp->_ub._size = 0;
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fp->_lb._base = NULL; /* no line buffer */
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fp->_lb._size = 0;
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return fp;
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}
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/*
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* exit() calls _cleanup() through *__cleanup, set whenever we
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* open or buffer a file. This chicanery is done so that programs
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* that do not use stdio need not link it all in.
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*
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* The name `_cleanup' is, alas, fairly well known outside stdio.
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*/
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static void
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cleanup_stdio (struct _reent *ptr)
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{
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int (*cleanup_func) (struct _reent *, FILE *);
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#ifdef _STDIO_BSD_SEMANTICS
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/* BSD and Glibc systems only flush streams which have been written to
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at exit time. Calling flush rather than close for speed, as on
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the aforementioned systems. */
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cleanup_func = __sflushw_r;
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#else
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/* Otherwise close files and flush read streams, too.
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Note we call flush directly if "--enable-lite-exit" is in effect. */
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#ifdef _LITE_EXIT
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cleanup_func = _fflush_r;
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#else
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cleanup_func = _fclose_r;
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#endif
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#endif
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#ifdef _REENT_GLOBAL_STDIO_STREAMS
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if (ptr->_stdin != &__sf[0])
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(*cleanup_func) (ptr, ptr->_stdin);
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if (ptr->_stdout != &__sf[1])
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(*cleanup_func) (ptr, ptr->_stdout);
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if (ptr->_stderr != &__sf[2])
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(*cleanup_func) (ptr, ptr->_stderr);
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#endif
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(void) _fwalk_reent (ptr, cleanup_func);
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}
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/*
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* __sinit() is called whenever stdio's internal variables must be set up.
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*/
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void
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__sinit (struct _reent *s)
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{
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__sinit_lock_acquire ();
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if (s->__cleanup)
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{
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__sinit_lock_release ();
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return;
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}
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/* make sure we clean up on exit */
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s->__cleanup = cleanup_stdio; /* conservative */
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s->__sglue._next = NULL;
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#ifndef _REENT_SMALL
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# ifndef _REENT_GLOBAL_STDIO_STREAMS
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s->__sglue._niobs = 3;
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s->__sglue._iobs = &s->__sf[0];
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# endif /* _REENT_GLOBAL_STDIO_STREAMS */
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#else
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s->__sglue._niobs = 0;
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s->__sglue._iobs = NULL;
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# ifndef _REENT_GLOBAL_STDIO_STREAMS
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s->_stdin = __sfp(s);
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s->_stdout = __sfp(s);
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s->_stderr = __sfp(s);
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# else /* _REENT_GLOBAL_STDIO_STREAMS */
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s->_stdin = &__sf[0];
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s->_stdout = &__sf[1];
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s->_stderr = &__sf[2];
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# endif /* _REENT_GLOBAL_STDIO_STREAMS */
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#endif
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#ifdef _REENT_GLOBAL_STDIO_STREAMS
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if (__sf[0]._cookie == NULL) {
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_GLOBAL_REENT->__sglue._niobs = 3;
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_GLOBAL_REENT->__sglue._iobs = &__sf[0];
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stdin_init (&__sf[0]);
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stdout_init (&__sf[1]);
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stderr_init (&__sf[2]);
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}
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#else /* _REENT_GLOBAL_STDIO_STREAMS */
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stdin_init (s->_stdin);
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stdout_init (s->_stdout);
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stderr_init (s->_stderr);
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#endif /* _REENT_GLOBAL_STDIO_STREAMS */
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__sinit_lock_release ();
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}
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(static, __sfp_recursive_mutex);
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__LOCK_INIT_RECURSIVE(static, __sinit_recursive_mutex);
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void
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__sfp_lock_acquire (void)
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{
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__lock_acquire_recursive (__sfp_recursive_mutex);
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}
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void
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__sfp_lock_release (void)
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{
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__lock_release_recursive (__sfp_recursive_mutex);
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}
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void
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__sinit_lock_acquire (void)
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{
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__lock_acquire_recursive (__sinit_recursive_mutex);
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}
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void
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__sinit_lock_release (void)
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{
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__lock_release_recursive (__sinit_recursive_mutex);
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}
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/* Walkable file locking routine. */
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static int
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__fp_lock (struct _reent * ptr __unused, FILE * fp)
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{
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if (!(fp->_flags2 & __SNLK))
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_flockfile (fp);
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return 0;
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}
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/* Walkable file unlocking routine. */
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static int
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__fp_unlock (struct _reent * ptr __unused, FILE * fp)
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{
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if (!(fp->_flags2 & __SNLK))
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_funlockfile (fp);
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return 0;
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}
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void
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__fp_lock_all (void)
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{
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__sfp_lock_acquire ();
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(void) _fwalk_reent (_REENT, __fp_lock);
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}
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void
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__fp_unlock_all (void)
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{
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(void) _fwalk_reent (_REENT, __fp_unlock);
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__sfp_lock_release ();
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}
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#endif
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