1 /* $NetBSD: fopen.c,v 1.10 2000/11/29 15:30:20 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: fopen.c,v 1.10 2000/11/29 15:30:20 christos Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #include <sys/types.h> 49 #include <sys/stat.h> 50 #include <assert.h> 51 #include <fcntl.h> 52 #include <unistd.h> 53 #include <stdio.h> 54 #include <errno.h> 55 #include "local.h" 56 57 FILE * 58 fopen(file, mode) 59 const char *file; 60 const char *mode; 61 { 62 FILE *fp; 63 int f; 64 int flags, oflags; 65 66 _DIAGASSERT(file != NULL); 67 if ((flags = __sflags(mode, &oflags)) == 0) 68 return (NULL); 69 if ((fp = __sfp()) == NULL) 70 return (NULL); 71 if ((f = open(file, oflags, DEFFILEMODE)) < 0) 72 goto release; 73 if (oflags & O_NONBLOCK) { 74 struct stat st; 75 if (fstat(f, &st) == -1) { 76 int sverrno = errno; 77 (void)close(f); 78 errno = sverrno; 79 goto release; 80 } 81 if (!S_ISREG(st.st_mode)) { 82 (void)close(f); 83 errno = EFTYPE; 84 goto release; 85 } 86 } 87 fp->_file = f; 88 fp->_flags = flags; 89 fp->_cookie = fp; 90 fp->_read = __sread; 91 fp->_write = __swrite; 92 fp->_seek = __sseek; 93 fp->_close = __sclose; 94 95 /* 96 * When opening in append mode, even though we use O_APPEND, 97 * we need to seek to the end so that ftell() gets the right 98 * answer. If the user then alters the seek pointer, or 99 * the file extends, this will fail, but there is not much 100 * we can do about this. (We could set __SAPP and check in 101 * fseek and ftell.) 102 */ 103 if (oflags & O_APPEND) 104 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 105 return (fp); 106 release: 107 fp->_flags = 0; /* release */ 108 return (NULL); 109 } 110