usr/src/lib/libbc/libc/sys/common/_creat.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 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <sys/syscall.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31 #include <sys/param.h>
  32 #include "compat.h"     /* for UTMPX_MAGIC_FLAG */
  33
  34 #define CREATFLAGS      (O_WRONLY | O_CREAT | O_TRUNC)
  35
  36 int
  37 creat_com(char *path, int mode)
  38 {
  39         int fd;
  40
  41         if (strcmp(path, "/etc/mtab") == 0 ||
  42             strcmp(path, "/etc/fstab") == 0) {
  43                 errno = ENOENT;
  44                 return (-1);
  45         }
  46         if (strcmp(path, "/var/adm/wtmp") == 0) {
  47                 if ((fd = _syscall(SYS_openat, AT_FDCWD,
  48                     "/var/adm/wtmpx", CREATFLAGS, mode)) >= 0)
  49                         fd_add(fd, UTMPX_MAGIC_FLAG);
  50                 return (fd);
  51         }
  52         if (strcmp(path, "/etc/utmp") == 0 ||
  53             strcmp(path, "/var/adm/utmp") == 0) {
  54                 if ((fd = _syscall(SYS_openat, AT_FDCWD,
  55                     "/var/adm/utmpx", CREATFLAGS, mode)) >= 0)
  56                         fd_add(fd, UTMPX_MAGIC_FLAG);
  57                 return (fd);
  58         }
  59         return (_syscall(SYS_openat, AT_FDCWD, path, CREATFLAGS, mode));
  60 }