fdopen.c (3091B)
1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char rcsid[] = "$OpenBSD: fdopen.c,v 1.2 1996/08/19 08:32:20 tholo Exp $"; 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/types.h> 42 #include <fcntl.h> 43 #include <unistd.h> 44 #include <stdio.h> 45 #include <errno.h> 46 #include "local.h" 47 48 FILE * 49 fdopen(fd, mode) 50 int fd; 51 const char *mode; 52 { 53 register FILE *fp; 54 int flags, oflags, fdflags, tmp; 55 56 if ((flags = __sflags(mode, &oflags)) == 0) 57 return (NULL); 58 59 /* Make sure the mode the user wants is a subset of the actual mode. */ 60 /* 61 if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) 62 return (NULL); 63 tmp = fdflags & O_ACCMODE; 64 if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 65 errno = EINVAL; 66 return (NULL); 67 } 68 */ 69 70 if ((fp = __sfp()) == NULL) 71 return (NULL); 72 fp->_flags = flags; 73 /* 74 * If opened for appending, but underlying descriptor does not have 75 * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to 76 * end before each write. 77 */ 78 if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) 79 fp->_flags |= __SAPP; 80 fp->_file = fd; 81 fp->_cookie = fp; 82 fp->_read = __sread; 83 fp->_write = __swrite; 84 fp->_seek = __sseek; 85 fp->_close = __sclose; 86 return (fp); 87 }