Annotation of prex-old/usr/lib/libc/stdio/fdopen.c, Revision 1.1
1.1 ! nbrk 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. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/types.h>
! 34: #include <fcntl.h>
! 35: #include <unistd.h>
! 36: #include <stdio.h>
! 37: #include <errno.h>
! 38: #include "local.h"
! 39:
! 40: FILE *
! 41: fdopen(fd, mode)
! 42: int fd;
! 43: const char *mode;
! 44: {
! 45: FILE *fp;
! 46: int flags, oflags, fdflags, tmp;
! 47:
! 48: if ((flags = __sflags(mode, &oflags)) == 0)
! 49: return (NULL);
! 50:
! 51: /* Make sure the mode the user wants is a subset of the actual mode. */
! 52: if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
! 53: return (NULL);
! 54: tmp = fdflags & O_ACCMODE;
! 55: if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
! 56: errno = EINVAL;
! 57: return (NULL);
! 58: }
! 59:
! 60: if ((fp = __sfp()) == NULL)
! 61: return (NULL);
! 62: fp->_flags = flags;
! 63: /*
! 64: * If opened for appending, but underlying descriptor does not have
! 65: * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
! 66: * end before each write.
! 67: */
! 68: if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
! 69: fp->_flags |= __SAPP;
! 70: fp->_file = fd;
! 71: return (fp);
! 72: }
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