1 /* Copyright (C) 1993, 1997, 2001, 2002 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. 18 19 As a special exception, if you link the code in this file with 20 files compiled with a GNU compiler to produce an executable, 21 that does not cause the resulting executable to be covered by 22 the GNU Lesser General Public License. This exception does not 23 however invalidate any other reasons why the executable file 24 might be covered by the GNU Lesser General Public License. 25 This exception applies to code released by its copyright holders 26 in files containing the exception. */ 27 28 /* 29 Copyright (C) 1990 The Regents of the University of California. 30 All rights reserved. 31 32 Redistribution and use in source and binary forms, with or without 33 modification, are permitted provided that the following conditions 34 are met: 35 36 1. Redistributions of source code must retain the above copyright 37 notice, this list of conditions and the following disclaimer. 38 2. Redistributions in binary form must reproduce the above copyright 39 notice, this list of conditions and the following disclaimer in the 40 documentation and/or other materials provided with the distribution. 41 4. Neither the name of the University nor the names of its contributors 42 may be used to endorse or promote products derived from this software 43 without specific prior written permission. 44 45 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 SUCH DAMAGE.*/ 56 57 /* Modified for GNU iostream by Per Bothner 1991, 1992. */ 58 59 #ifndef _POSIX_SOURCE 60 # define _POSIX_SOURCE 61 #endif 62 #include "libioP.h" 63 #include <sys/types.h> 64 #include <sys/stat.h> 65 #ifdef __STDC__ 66 #include <stdlib.h> 67 #include <unistd.h> 68 #endif 69 70 #ifdef _LIBC 71 # undef isatty 72 # define isatty(Fd) __isatty (Fd) 73 74 # include <device-nrs.h> 75 #endif 76 77 /* 78 * Allocate a file buffer, or switch to unbuffered I/O. 79 * Per the ANSI C standard, ALL tty devices default to line buffered. 80 * 81 * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek 82 * optimisation) right after the _fstat() that finds the buffer size. 83 */ 84 85 int 86 _IO_file_doallocate (fp) 87 _IO_FILE *fp; 88 { 89 _IO_size_t size; 90 char *p; 91 struct _G_stat64 st; 92 93 #ifndef _LIBC 94 /* If _IO_cleanup_registration_needed is non-zero, we should call the 95 function it points to. This is to make sure _IO_cleanup gets called 96 on exit. We call it from _IO_file_doallocate, since that is likely 97 to get called by any program that does buffered I/O. */ 98 if (__builtin_expect (_IO_cleanup_registration_needed != NULL, 0)) 99 (*_IO_cleanup_registration_needed) (); 100 #endif 101 102 size = _IO_BUFSIZ; 103 if (fp->_fileno >= 0 && __builtin_expect (_IO_SYSSTAT (fp, &st), 0) >= 0) 104 { 105 if (S_ISCHR (st.st_mode)) 106 { 107 /* Possibly a tty. */ 108 if ( 109 #ifdef DEV_TTY_P 110 DEV_TTY_P (&st) || 111 #endif 112 isatty (fp->_fileno)) 113 fp->_flags |= _IO_LINE_BUF; 114 } 115 #if _IO_HAVE_ST_BLKSIZE 116 if (st.st_blksize > 0) 117 size = st.st_blksize; 118 #endif 119 } 120 ALLOC_BUF (p, size, EOF); 121 INTUSE(_IO_setb) (fp, p, p + size, 1); 122 return 1; 123 } 124 INTDEF(_IO_file_doallocate) 125