2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
205 lines
6 KiB
C
205 lines
6 KiB
C
/* $NetBSD: freopen.c,v 1.16 2010/01/11 20:39:29 joerg Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)freopen.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: freopen.c,v 1.16 2010/01/11 20:39:29 joerg Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <limits.h>
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#include "reentrant.h"
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#include "local.h"
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/*
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* Re-direct an existing, open (probably) file to some other file.
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* ANSI is written such that the original file gets closed if at
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* all possible, no matter what.
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*/
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FILE *
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freopen(file, mode, fp)
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const char *file, *mode;
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FILE *fp;
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{
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int f;
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int flags, isopen, oflags, sverrno, wantfd;
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_DIAGASSERT(file != NULL);
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_DIAGASSERT(mode != NULL);
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_DIAGASSERT(fp != NULL);
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if ((flags = __sflags(mode, &oflags)) == 0) {
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(void) fclose(fp);
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return (NULL);
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}
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if (!__sdidinit)
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__sinit();
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/*
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* There are actually programs that depend on being able to "freopen"
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* descriptors that weren't originally open. Keep this from breaking.
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* Remember whether the stream was open to begin with, and which file
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* descriptor (if any) was associated with it. If it was attached to
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* a descriptor, defer closing it; freopen("/dev/stdin", "r", stdin)
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* should work. This is unnecessary if it was not a Unix file.
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*/
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if (fp->_flags == 0) {
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fp->_flags = __SEOF; /* hold on to it */
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isopen = 0;
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wantfd = -1;
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} else {
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/* flush the stream; ANSI doesn't require this. */
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if (fp->_flags & __SWR)
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(void) __sflush(fp);
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/* if close is NULL, closing is a no-op, hence pointless */
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isopen = fp->_close != NULL;
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if ((wantfd = __sfileno(fp)) == -1 && isopen) {
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(void) (*fp->_close)(fp->_cookie);
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isopen = 0;
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}
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}
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/* Get a new descriptor to refer to the new file. */
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f = open(file, oflags, DEFFILEMODE);
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if (f < 0 && isopen) {
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/* If out of fd's close the old one and try again. */
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if (errno == ENFILE || errno == EMFILE) {
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(void) (*fp->_close)(fp->_cookie);
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isopen = 0;
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f = open(file, oflags, DEFFILEMODE);
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}
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}
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sverrno = errno;
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/*
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* Finish closing fp. Even if the open succeeded above, we cannot
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* keep fp->_base: it may be the wrong size. This loses the effect
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* of any setbuffer calls, but stdio has always done this before.
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*/
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if (isopen && f != wantfd)
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(void) (*fp->_close)(fp->_cookie);
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if (fp->_flags & __SMBF)
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free((char *)fp->_bf._base);
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fp->_w = 0;
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fp->_r = 0;
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fp->_p = NULL;
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fp->_bf._base = NULL;
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fp->_bf._size = 0;
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fp->_lbfsize = 0;
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if (HASUB(fp))
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FREEUB(fp);
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WCIO_FREE(fp);
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_UB(fp)._size = 0;
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FREELB(fp);
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if (f < 0) { /* did not get it after all */
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fp->_flags = 0; /* set it free */
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errno = sverrno; /* restore in case _close clobbered */
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return (NULL);
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}
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if (oflags & O_NONBLOCK) {
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struct stat st;
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if (fstat(f, &st) == -1) {
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sverrno = errno;
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(void)close(f);
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errno = sverrno;
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return (NULL);
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}
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if (!S_ISREG(st.st_mode)) {
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(void)close(f);
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errno = EFTYPE;
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return (NULL);
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}
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}
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/*
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* If reopening something that was open before on a real file, try
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* to maintain the descriptor. Various C library routines (perror)
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* assume stderr is always fd STDERR_FILENO, even if being freopen'd.
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*/
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if (wantfd >= 0 && f != wantfd) {
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if (dup2(f, wantfd) >= 0) {
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(void) close(f);
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f = wantfd;
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}
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}
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/*
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* File descriptors are a full int, but _file is only a short.
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* If we get a valid file descriptor that is greater or equal to
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* USHRT_MAX, then the fd will get sign-extended into an
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* invalid file descriptor. Handle this case by failing the
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* open. (We treat the short as unsigned, and special-case -1).
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*/
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if (f >= USHRT_MAX) {
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(void)close(f);
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errno = EMFILE;
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return NULL;
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}
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fp->_flags = flags;
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fp->_file = f;
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fp->_cookie = fp;
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fp->_read = __sread;
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fp->_write = __swrite;
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fp->_seek = __sseek;
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fp->_close = __sclose;
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/*
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* When reopening in append mode, even though we use O_APPEND,
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* we need to seek to the end so that ftell() gets the right
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* answer. If the user then alters the seek pointer, or
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* the file extends, this will fail, but there is not much
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* we can do about this. (We could set __SAPP and check in
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* fseek and ftell.)
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*/
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if (oflags & O_APPEND)
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(void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
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return (fp);
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}
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