lib/libc/sys/fcntl.c

   1 /*-
   2  * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
   3  * Authors: Doug Rabson <dfr@rabson.org>
   4  * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <fcntl.h>
  32 #include <stdarg.h>
  33 #include <sys/types.h>
  34 #include <sys/syscall.h>
  35 #include "libc_private.h"
  36
  37 #pragma weak fcntl
  38 int
  39 fcntl(int fd, int cmd, ...)
  40 {
  41         va_list args;
  42         long arg;
  43
  44         va_start(args, cmd);
  45         arg = va_arg(args, long);
  46         va_end(args);
  47
  48         return (((int (*)(int, int, ...))
  49             __libc_interposing[INTERPOS_fcntl])(fd, cmd, arg));
  50 }
  51
  52 #ifdef SYSCALL_COMPAT
  53 __weak_reference(__fcntl_compat, __fcntl);
  54
  55 int
  56 __fcntl_compat(int fd, int cmd, ...)
  57 {
  58         va_list args;
  59         long arg;
  60         struct __oflock ofl;
  61         struct flock *flp;
  62         int res;
  63
  64         va_start(args, cmd);
  65         arg = va_arg(args, long);
  66         va_end(args);
  67
  68         if (__getosreldate() >= 800028) {
  69                 return (__sys_fcntl(fd, cmd, arg));
  70         } else {
  71                 if (cmd == F_GETLK || cmd == F_SETLK || cmd == F_SETLKW) {
  72                         /*
  73                          * Convert new-style struct flock (which
  74                          * includes l_sysid) to old-style.
  75                          */
  76                         flp = (struct flock *) (uintptr_t) arg;
  77                         ofl.l_start = flp->l_start;
  78                         ofl.l_len = flp->l_len;
  79                         ofl.l_pid = flp->l_pid;
  80                         ofl.l_type = flp->l_type;
  81                         ofl.l_whence = flp->l_whence;
  82
  83                         switch (cmd) {
  84                         case F_GETLK:
  85                                 res = __sys_fcntl(fd, F_OGETLK, &ofl);
  86                                 if (res >= 0) {
  87                                         flp->l_start = ofl.l_start;
  88                                         flp->l_len = ofl.l_len;
  89                                         flp->l_pid = ofl.l_pid;
  90                                         flp->l_type = ofl.l_type;
  91                                         flp->l_whence = ofl.l_whence;
  92                                         flp->l_sysid = 0;
  93                                 }
  94                                 return (res);
  95
  96                         case F_SETLK:
  97                                 return (__sys_fcntl(fd, F_OSETLK, &ofl));
  98
  99                         case F_SETLKW:
 100                                 return (__sys_fcntl(fd, F_OSETLKW, &ofl));
 101                         }
 102                 }
 103                 return (__sys_fcntl(fd, cmd, arg));
 104         }
 105 }
 106 #endif