1 /* $NetBSD: fopen.c,v 1.12 2003/08/07 16:43:24 agc 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: fopen.c,v 1.12 2003/08/07 16:43:24 agc Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 #include <assert.h> 47 #include <fcntl.h> 48 #include <unistd.h> 49 #include <stdio.h> 50 #include <errno.h> 51 #include "reentrant.h" 52 #include "local.h" 53 54 FILE * 55 fopen(file, mode) 56 const char *file; 57 const char *mode; 58 { 59 FILE *fp; 60 int f; 61 int flags, oflags; 62 63 _DIAGASSERT(file != NULL); 64 if ((flags = __sflags(mode, &oflags)) == 0) 65 return (NULL); 66 if ((fp = __sfp()) == NULL) 67 return (NULL); 68 if ((f = open(file, oflags, DEFFILEMODE)) < 0) 69 goto release; 70 if (oflags & O_NONBLOCK) { 71 struct stat st; 72 if (fstat(f, &st) == -1) { 73 int sverrno = errno; 74 (void)close(f); 75 errno = sverrno; 76 goto release; 77 } 78 if (!S_ISREG(st.st_mode)) { 79 (void)close(f); 80 errno = EFTYPE; 81 goto release; 82 } 83 } 84 fp->_file = f; 85 fp->_flags = flags; 86 fp->_cookie = fp; 87 fp->_read = __sread; 88 fp->_write = __swrite; 89 fp->_seek = __sseek; 90 fp->_close = __sclose; 91 92 /* 93 * When opening in append mode, even though we use O_APPEND, 94 * we need to seek to the end so that ftell() gets the right 95 * answer. If the user then alters the seek pointer, or 96 * the file extends, this will fail, but there is not much 97 * we can do about this. (We could set __SAPP and check in 98 * fseek and ftell.) 99 */ 100 if (oflags & O_APPEND) 101 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 102 return (fp); 103 release: 104 fp->_flags = 0; /* release */ 105 return (NULL); 106 } 107