usr/src/lib/libc/port/gen/attropen.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  *      attropen -- C library extension routine
  31  */
  32
  33 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64
  34 #pragma weak _attropen64 = attropen64
  35 #else
  36 #pragma weak _attropen = attropen
  37 #endif
  38
  39 #include "lint.h"
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <stdlib.h>
  44 #include <errno.h>
  45 #include <unistd.h>
  46 #include <stdarg.h>
  47
  48 #if !defined(_LP64) && _FILE_OFFSET_BITS == 64
  49
  50 int
  51 attropen64(const char *file, const char *attr, int oflag, ...)
  52 {
  53         int fd;
  54         int attrfd;
  55         int saverrno;
  56         va_list ap;
  57
  58         va_start(ap, oflag);
  59
  60         if ((fd = open64(file, O_RDONLY|O_NONBLOCK)) == -1) {
  61                 va_end(ap);
  62                 return (-1);
  63         }
  64
  65         if ((attrfd = openat64(fd, attr, oflag | O_XATTR,
  66             va_arg(ap, mode_t))) == -1) {
  67                 saverrno = errno;
  68                 (void) close(fd);
  69                 errno = saverrno;
  70                 va_end(ap);
  71                 return (-1);
  72         }
  73
  74         (void) close(fd);
  75         va_end(ap);
  76         return (attrfd);
  77 }
  78
  79 #else
  80
  81 int
  82 attropen(const char *file, const char *attr, int oflag, ...)
  83 {
  84         int fd;
  85         int attrfd;
  86         int saverrno;
  87         va_list ap;
  88
  89         va_start(ap, oflag);
  90
  91         if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) {
  92                 va_end(ap);
  93                 return (-1);
  94         }
  95
  96         if ((attrfd = openat(fd, attr, oflag | O_XATTR,
  97             va_arg(ap, mode_t))) == -1) {
  98                 saverrno = errno;
  99                 (void) close(fd);
 100                 errno = saverrno;
 101                 va_end(ap);
 102                 return (-1);
 103         }
 104
 105         (void) close(fd);
 106         va_end(ap);
 107         return (attrfd);
 108 }
 109
 110 #endif /* _FILE_OFFSET_BITS == 64 */