Annotation of sys/arch/i386/stand/pxeboot/open.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: open.c,v 1.1 2004/03/19 13:48:19 tom Exp $ */
! 2: /* $NetBSD: open.c,v 1.12 1996/09/30 16:01:21 ws Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to Berkeley by
! 9: * The Mach Operating System project at Carnegie-Mellon University.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * @(#)open.c 8.1 (Berkeley) 6/11/93
! 36: *
! 37: *
! 38: * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
! 39: * All Rights Reserved.
! 40: *
! 41: * Author: Alessandro Forin
! 42: *
! 43: * Permission to use, copy, modify and distribute this software and its
! 44: * documentation is hereby granted, provided that both the copyright
! 45: * notice and this permission notice appear in all copies of the
! 46: * software, derivative works or modified versions, and any portions
! 47: * thereof, and that both notices appear in supporting documentation.
! 48: *
! 49: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 50: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
! 51: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 52: *
! 53: * Carnegie Mellon requests users of this software to return to
! 54: *
! 55: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 56: * School of Computer Science
! 57: * Carnegie Mellon University
! 58: * Pittsburgh PA 15213-3890
! 59: *
! 60: * any improvements or extensions that they make and grant Carnegie the
! 61: * rights to redistribute these changes.
! 62: */
! 63:
! 64: #include <lib/libsa/stand.h>
! 65:
! 66: struct open_file files[SOPEN_MAX];
! 67:
! 68: /*
! 69: * File primitives proper
! 70: */
! 71:
! 72: int
! 73: #ifndef __INTERNAL_LIBSA_CREAD
! 74: open(const char *fname, int mode)
! 75: #else
! 76: oopen(const char *fname, int mode)
! 77: #endif
! 78: {
! 79: struct open_file *f;
! 80: int fd, i, error;
! 81: char *file;
! 82:
! 83: /* find a free file descriptor */
! 84: for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++)
! 85: if (f->f_flags == 0)
! 86: goto fnd;
! 87: errno = EMFILE;
! 88: return -1;
! 89: fnd:
! 90: /*
! 91: * Try to open the device.
! 92: * Convert open mode (0,1,2) to F_READ, F_WRITE.
! 93: */
! 94: f->f_flags = mode + 1;
! 95: f->f_dev = (struct devsw *)0;
! 96: f->f_ops = (struct fs_ops *)0;
! 97: file = (char *)0;
! 98: error = devopen(f, fname, &file);
! 99: if (error ||
! 100: (((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
! 101: goto err;
! 102:
! 103: /* see if we opened a raw device; otherwise, 'file' is the file name. */
! 104: if (file == (char *)0 || *file == '\0') {
! 105: f->f_flags |= F_RAW;
! 106: return fd;
! 107: }
! 108:
! 109: /* Allow f->f_ops to be set by devopen routine. */
! 110: if (f->f_ops != NULL) {
! 111: error = f->f_ops->open(file, f);
! 112: if (error == 0)
! 113: return fd;
! 114: }
! 115: else {
! 116: /* pass file name to the different filesystem open routines */
! 117: for (i = 0; i < nfsys; i++) {
! 118: /* convert mode (0,1,2) to FREAD, FWRITE. */
! 119: error = (file_system[i].open)(file, f);
! 120: if (error == 0) {
! 121: f->f_ops = &file_system[i];
! 122: return (fd);
! 123: }
! 124: if (error == ENOENT || error == ENOTDIR)
! 125: break;
! 126: }
! 127: }
! 128: if (error == 0)
! 129: error = ENOENT;
! 130:
! 131: f->f_dev->dv_close(f);
! 132: err:
! 133: f->f_flags = 0;
! 134: errno = error;
! 135: return -1;
! 136: }
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