1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "lint.h" 33 #include "file64.h" 34 #include "mtlib.h" 35 #include <sys/types.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <thread.h> 39 #include <synch.h> 40 #include "stdiom.h" 41 42 43 void 44 setbuf(FILE *iop, char *abuf) 45 { 46 Uchar *buf = (Uchar *)abuf; 47 int fno = GET_FD(iop); /* file number */ 48 int size = BUFSIZ - _SMBFSZ; 49 Uchar *temp; 50 rmutex_t *lk; 51 52 FLOCKFILE(lk, iop); 53 if ((iop->_base != 0) && (iop->_flag & _IOMYBUF)) 54 free((char *)iop->_base - PUSHBACK); 55 iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF); 56 if (buf == 0) { 57 iop->_flag |= _IONBF; 58 #ifndef _STDIO_ALLOCATE 59 if (fno < 2) { 60 /* use special buffer for std{in,out} */ 61 buf = (fno == 0) ? _sibuf : _sobuf; 62 } else /* needed for ifndef */ 63 #endif 64 if (fno < _NFILE) { 65 buf = _smbuf[fno]; 66 size = _SMBFSZ - PUSHBACK; 67 } else 68 if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != 0) { 69 iop->_flag |= _IOMYBUF; 70 size = _SMBFSZ - PUSHBACK; 71 } 72 } else { /* regular buffered I/O, standard buffer size */ 73 if (isatty(fno)) 74 iop->_flag |= _IOLBF; 75 } 76 if (buf == 0) { 77 FUNLOCKFILE(lk); 78 return; /* malloc() failed */ 79 } 80 temp = buf + PUSHBACK; 81 iop->_base = temp; 82 _setbufend(iop, temp + size); 83 iop->_ptr = temp; 84 iop->_cnt = 0; 85 FUNLOCKFILE(lk); 86 } 87