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linux32_fcntl.c revision 1.6.12.1 
      1 /*	$NetBSD: linux32_fcntl.c,v 1.6.12.1 2008/05/10 23:48:56 wrstuden Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved.
      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  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Emmanuel Dreyfus
     17  * 4. The name of the author may not be used to endorse or promote
     18  *    products derived from this software without specific prior written
     19  *    permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
     22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
     25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     31  * POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 
     36 __KERNEL_RCSID(0, "$NetBSD: linux32_fcntl.c,v 1.6.12.1 2008/05/10 23:48:56 wrstuden Exp $");
     37 
     38 #include <sys/types.h>
     39 #include <sys/param.h>
     40 #include <sys/signal.h>
     41 #include <sys/fcntl.h>
     42 #include <sys/filedesc.h>
     43 
     44 #include <machine/types.h>
     45 
     46 #include <sys/sa.h>
     47 #include <sys/syscallargs.h>
     48 
     49 #include <compat/netbsd32/netbsd32.h>
     50 #include <compat/netbsd32/netbsd32_syscallargs.h>
     51 
     52 #include <compat/linux/common/linux_types.h>
     53 #include <compat/linux/common/linux_fcntl.h>
     54 #include <compat/linux/common/linux_machdep.h>
     55 #include <compat/linux/common/linux_misc.h>
     56 #include <compat/linux/linux_syscallargs.h>
     57 
     58 #include <compat/linux32/common/linux32_types.h>
     59 #include <compat/linux32/common/linux32_signal.h>
     60 #include <compat/linux32/common/linux32_machdep.h>
     61 #include <compat/linux32/linux32_syscallargs.h>
     62 
     63 struct linux32_flock {
     64 	short       l_type;
     65 	short       l_whence;
     66 	int32_t     l_start;
     67 	int32_t     l_len;
     68 	linux_pid_t l_pid;
     69 };
     70 
     71 struct linux32_flock64 {
     72 	short           l_type;
     73 	short           l_whence;
     74 	netbsd32_int64	l_start;
     75 	netbsd32_int64	l_len;
     76 	linux_pid_t     l_pid;
     77 };
     78 
     79 conv_linux_flock(linux32, flock)
     80 conv_linux_flock(linux32, flock64)
     81 
     82 int
     83 linux32_sys_open(struct lwp *l, const struct linux32_sys_open_args *uap, register_t *retval)
     84 {
     85 	/* {
     86 		syscallarg(const netbsd32_charp) path;
     87 		syscallarg(int) flags;
     88 		syscallarg(int) mode;
     89 	} */
     90 	struct linux_sys_open_args ua;
     91 
     92 	NETBSD32TOP_UAP(path, const char);
     93 	NETBSD32TO64_UAP(flags);
     94 	NETBSD32TO64_UAP(mode);
     95 
     96 	return linux_sys_open(l, &ua, retval);
     97 }
     98 
     99 /*
    100  * The linux support for 64bit file offsets introduced both an fcntl64()
    101  * function and LINUX_F_SETLK64 (et al), however the fcntl64() function
    102  * can still be passed LINUX_F_GETLK (etc).
    103  * In practice this means that the two functions are identical!
    104  *
    105  * We have to intercept both sets of locking primitives because the
    106  * structure layout of the 64bit version differs from that on amd64 due
    107  * to extra padding because the alignment constraint for int64_t differs.
    108  */
    109 
    110 int
    111 linux32_sys_fcntl(struct lwp *l, const struct linux32_sys_fcntl_args *uap, register_t *retval)
    112 {
    113 	/* {
    114 		syscallcarg(int) fd;
    115                 syscallarg(int) cmd;
    116 		syscallarg(netbsd32_voidp) arg;
    117 	} */
    118 	struct linux_sys_fcntl_args ua;
    119 	int cmd =  SCARG(uap, cmd);
    120 
    121 	switch (cmd) {
    122 	case LINUX_F_GETLK64:
    123 		do_linux_getlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
    124 		    linux32, flock64);
    125 	case LINUX_F_SETLK64:
    126 	case LINUX_F_SETLKW64:
    127 		do_linux_setlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
    128 		    linux32, flock64, LINUX_F_SETLK64);
    129 	case LINUX_F_GETLK:
    130 		do_linux_getlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
    131 		    linux32, flock);
    132 	case LINUX_F_SETLK:
    133 	case LINUX_F_SETLKW:
    134 		do_linux_setlk(SCARG(uap, fd), cmd, SCARG_P32(uap, arg),
    135 		    linux32, flock, LINUX_F_SETLK);
    136 	default:
    137 		break;
    138 	}
    139 
    140 	NETBSD32TO64_UAP(fd);
    141 	SCARG(&ua, cmd) = cmd;
    142 	NETBSD32TOP_UAP(arg, void);
    143 
    144 	return linux_sys_fcntl(l, &ua, retval);
    145 }
    146