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/*
* Copyright ( c ) 1991 , 1992 Paul Kranenburg < pk @ cs . few . eur . nl >
* Copyright ( c ) 1993 Branko Lankester < branko @ hacktic . nl >
* Copyright ( c ) 1993 , 1994 , 1995 , 1996 Rick Sladkey < jrs @ world . std . com >
* Copyright ( c ) 1996 - 1999 Wichert Akkerman < wichert @ cistron . nl >
* Copyright ( c ) 2002 - 2005 Roland McGrath < roland @ redhat . com >
* Copyright ( c ) 2009 Andreas Schwab < schwab @ redhat . com >
* Copyright ( c ) 2012 H . J . Lu < hongjiu . lu @ intel . com >
* Copyright ( c ) 2013 Denys Vlasenko < vda . linux @ googlemail . com >
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* Copyright ( c ) 2014 - 2016 Dmitry V . Levin < ldv @ altlinux . org >
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* All rights reserved .
*
* Redistribution and use in source and binary forms , with or without
* modification , are permitted provided that the following conditions
* are met :
* 1. Redistributions of source code must retain the above copyright
* notice , this list of conditions and the following disclaimer .
* 2. Redistributions in binary form must reproduce the above copyright
* notice , this list of conditions and the following disclaimer in the
* documentation and / or other materials provided with the distribution .
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission .
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ` ` AS IS ' ' AND ANY EXPRESS OR
* IMPLIED WARRANTIES , INCLUDING , BUT NOT LIMITED TO , THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED .
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT , INDIRECT ,
* INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT
* NOT LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS OF USE ,
* DATA , OR PROFITS ; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT
* ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE , EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE .
*/
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# include "defs.h"
# include "xlat/whence_codes.h"
/* Linux kernel has exactly one version of lseek:
* fs / read_write . c : : SYSCALL_DEFINE3 ( lseek , unsigned , fd , off_t , offset , unsigned , origin )
* In kernel , off_t is always the same as ( kernel ' s ) long
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* ( see include / uapi / asm - generic / posix_types . h ) .
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* Use test / x32_lseek . c to test lseek decoding .
*/
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SYS_FUNC ( lseek )
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{
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printfd ( tcp , tcp - > u_arg [ 0 ] ) ;
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kernel_long_t offset ;
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# ifndef current_klongsize
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if ( current_klongsize < sizeof ( kernel_long_t ) ) {
offset = ( int ) tcp - > u_arg [ 1 ] ;
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} else
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# endif /* !current_klongsize */
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{
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offset = tcp - > u_arg [ 1 ] ;
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}
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tprintf ( " , % " PRI_kld " , " , offset ) ;
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printxval ( whence_codes , tcp - > u_arg [ 2 ] , " SEEK_??? " ) ;
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return RVAL_DECODED | RVAL_UDECIMAL ;
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}
/* llseek syscall takes explicitly two ulong arguments hi, lo,
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* rather than one 64 - bit argument for which ULONG_LONG works
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* appropriate for the native byte order .
*
* See kernel ' s fs / read_write . c : : SYSCALL_DEFINE5 ( llseek , . . . )
*
* hi , lo are " unsigned longs " and combined exactly this way in kernel :
* ( ( loff_t ) hi < < 32 ) | lo
* Note that for architectures with kernel ' s long wider than userspace long
* ( such as x32 ) , combining code will use * kernel ' s * , i . e . * wide * longs
* for hi and lo . We would need to use tcp - > ext_arg [ N ] on x32 . . .
* . . . however , x32 ( and x86_64 ) does not _have_ llseek syscall as such .
*/
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SYS_FUNC ( llseek )
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{
if ( entering ( tcp ) ) {
printfd ( tcp , tcp - > u_arg [ 0 ] ) ;
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tprintf ( " , %lld, " ,
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( zero_extend_signed_to_ull ( tcp - > u_arg [ 1 ] ) < < 32 )
| zero_extend_signed_to_ull ( tcp - > u_arg [ 2 ] ) ) ;
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} else {
printnum_int64 ( tcp , tcp - > u_arg [ 3 ] , " % " PRIu64 ) ;
tprints ( " , " ) ;
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printxval ( whence_codes , tcp - > u_arg [ 4 ] , " SEEK_??? " ) ;
}
return 0 ;
}