.\" This is in the public domain
.\"
.\" Japanese Version Copyright (c) 1998 NAKANO Takeo all rights reserved.
.\" Translated 1998-05-23, NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated & Modified 1999-09-14, NAKANO Takeo
.\" Updated & Modified 2002-01-17, Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified 2002-07-15, Yuichi SATO
.\" Updated 2007-06-13, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.55
.\"
.TH LD.SO 8 2008-10-27 "GNU" "Linux Programmer's Manual"
.SH ̾
ld.so, ld-linux.so* \- ưŪʥ/
.SH 
ưŪ󥫤ϡưŪ˥󥯤줿ץ饤֥μ¹Ԥˤä
Ū˼¹Ԥ뤳ȤǤ
(ELF ξ硢ưŪ󥫤˥ޥɥ饤󥪥ץϤȤϤǤ
ץ
.B .interp
äƤưŪ󥫤¹Ԥ)
ޤʲΤ褦ľܼ¹Ԥ뤳ȤǤ
.P
.I /lib/ld-linux.so.*
[OPTIONS] [PROGRAM [ARGUMENTS]]
.SH 
ץ
.B ld.so

.B ld-linux.so*
ϥץɬפʶͭ饤֥򸫤Ĥƥɤ
ץμ¹ԤƤ鵯ư롣
.LP
Linux ΥХʥϡѥλ
.BR ld (1)
Ф
.B \-static
ץ󤬻ꤵƤʤ¤ꡢưŪ (¹Ի) ɬפȤʤ롣
.LP
ץ
.B ld.so
 a.out Хʥ򰷤
ϤäΤ˻ȤƤեޥåȤǤ롣
.B ld-linux.so*
(libc5 Ǥ \fI/lib/ld-linux.so.1\fP,
glibc2 Ǥ \fI/lib/ld-linux.so.2\fP)
 ELF Хʥ򰷤
ΥեޥåȤ¿οͤǶᲿǯȤäƤ롣
ʳǤξȤƱ褦ư
Ʊݡȥեȥץ
.BR ldd (1),
.BR ldconfig (8),
.I /etc/ld.so.conf
Ѥ롣
.LP
ץɬפȤ붦ͭ饤֥ϡ
ʲνǸ롣
.IP o 3
(ELF Τ)
ХʥưŪ° DT_RPATH ¸ߤ
DT_RUNPATH °¸ߤʤϡ
DT_RPATH ǻꤵ줿ǥ쥯ȥѤ롣
DT_RPATH λѤϿ侩ʤ
.IP o
Ķѿ
.B LD_LIBRARY_PATH
Ѥ롣
¹ԥե뤬 set-user-ID/set-group-ID Хʥξ硢
̵뤵롣
.IP o
(ELF Τ)
ХʥưŪ° DT_RUNPATH ¸ߤС
DT_RUNPATH ǻꤵ줿ǥ쥯ȥѤ롣
.IP o
åե
.I /etc/ld.so.cache
õΥեϡ
(ld.so.conf ɲûꤵ줿Τޤ᤿) 饤֥긡ѥ
Ĥä饤֥եξ򽸤᤿ΤǤ롣
Хʥ꤬󥫥ץ
.B \-z nodeflib
ǥ󥯤ƤϡǥեȤΥ饤֥ѥˤ
饤֥ϥåפ롣
.IP o
ǥեȥѥǤ
.IR /lib 

.I /usr/lib
Ѥ롣
Хʥ꤬󥫥ץ
.B \-z nodeflib
ǥ󥯤Ƥ硢Υƥåפϥåפ롣
.SS $ORIGIN  rpath
.PP
.B ld.so
Ǥϡrpath  (DT_RPATH  DT_RUNPATH) 
.I $ORIGIN
Ȥʸ
.RI ( ${ORIGIN}
) ȤȤǤ롣
.I $ORIGIN
ϥץꥱμ¹ԥե뤬äƤǥ쥯ȥɽ
Ȥä
.I somedir/app
֤줿ץꥱ
.I gcc -Wl,-rpath,'$ORIGIN/../lib'
ǥѥ뤹ȡ
.I somedir
ǥ쥯ȥ곬ؤΤɤˤäƤ⡢ץꥱ
.I somedir/lib
ˤб붦ͭ饤֥򸫤Ĥ뤳ȤǤ롣
εǽȤȡ
̤ʥǥ쥯ȥǤϤʤǤդΥǥ쥯ȥ˥󥹥ȡ뤷Ƥ
"䤳ʤ"
ȼζͭ饤֥Ȥ륢ץꥱ뤳ȤǤ롣
.\" ld.so also understands $LIB, with the same meaning as $ORIGIN/lib,
.\" it appears.
.\"
.\" There is also $PLATFORM.  This is a kind of wildcard
.\" of directories related at AT_HWCAP.  To get an idea of the
.\" places that $PLATFORM would match, look at the output of the
.\" following:
.\"
.\" mkdir /tmp/d
.\" LD_LIBRARY_PATH=/tmp/d strace -e open /bin/date 2>&1 | grep /tmp/d
.\"
.\" ld.so lets names be abbreviated, so $O will work for $ORIGIN;
.\" Don't do this!!
.SH ץ
.TP
.B \-\-list
Ƥΰ¸طȤβˡꥹȤ롣
.TP
.B \-\-verify
ץबưŪ˥󥯤Ƥ뤫ȡ
ưŪ󥫤Υץ򰷤뤫򸡾ڤ롣
.TP
.B \-\-library\-path PATH
.B LD_LIBRARY_PATH
Ķѿ񤭤 ()
.TP
.B \-\-inhibit\-rpath LIST
LIST ˤ륪֥̾ RPATH  RUNPATH ξ̵뤹롣
.B ld.so
 set-user-ID  set-group-ID Ƥ硢
Υץ̵뤵롣
.SH Ķѿ
4 ĤνפʴĶѿ롣
.TP
.B LD_BIND_NOW
(libc5; glibc 2.1.1 ʹ)
ʸǤʤ硢
ưŪ󥫤ϥץγϻƤΥܥ褹롣
ʸξ硢褷ʤФʤʤؿƤӽФ
ǽ˻Ȥ줿Dz褹롣
ǥХåȤäƤȤΩġ
.TP
.B LD_LIBRARY_PATH
ڤΥǥ쥯ȥꥹȡ
¹Ի ELF 饤֥򸡺ǥ쥯ȥꤹ롣
.B PATH
ĶѿƱ褦˻ꤹ롣
.TP
.B LD_PRELOAD
ڡڤ ELF ͭ饤֥ꤹ롣
ϥ桼Ǥ٤ƤΥ饤֥Ωäƥɤ롣
¾ζͭ饤֥ˤؿŪ֤뤿Ѥ뤳ȤǤ롣
set-user-ID/set-group-ID 줿 ELF ХʥФơ
ɸŪʸѥˤ饤֥Τ set-user-ID ƤΤϥɤʤ
.TP
.B LD_TRACE_LOADED_OBJECTS
(ELF Τ)
ʸǤʤ硢
ץ̤˼¹ԤΤǤϤʤ
.BR ldd (1)
¹ԤȤΤ褦ưŪ饤֥ΰ¸طꥹɽ롣
.LP
ơۤΤƤʤĶѿ⤢롣
¿ѤƤޤäΤǤΤ߻ѤĶѿǤ롣
.TP
.B LD_AOUT_LIBRARY_PATH
(libc5)
a.out ХʥˤΤ߻ȤĶѿǡ
.B LD_LIBRARY_PATH
Ʊ򤹤롣
ld\-linux.so.1 θŤСǤ
.B LD_ELF_LIBRARY_PATH
⥵ݡȤƤ
.TP
.B LD_AOUT_PRELOAD
(libc5)
a.out ХʥˤΤ߻ȤĶѿǡ
.B LD_PRELOAD
Ʊ򤹤롣
ld\-linux.so.1 θŤСǤ
.B LD_ELF_PRELOAD
⥵ݡȤƤ
.\" FIXME
.\" Document LD_AUDIT ("Install audit libraries for glibc")
.\" new in glibc 2.4
.\" ignored in set-user-ID and set-group-ID programs
.\"
.\" For some info, see Solaris Linker and Libraries Guide,
.\" "Runtime Linker Auditing Interface"
.TP
.B LD_BIND_NOT
(glibc 2.1.95 ʹ)
ܥ褷塢GOT (global offset table) 
PLT (procedure linkage table) 򹹿ʤ
.TP
.B LD_DEBUG
(glibc 2.1 ʹ)
ưŪ󥫤ξܺ٤ʥǥХåϤ롣
.B all
ꤷ硢ƤưŪ󥫤ĥǥХåɽ롣
.B help
ꤷ硢δĶѿǻꤵ륫ƥΥإ׾ɽ롣
glibc 2.3.4 ʹߡ
set-user-ID/set-group-ID 줿ХʥǤ
.B LD_DEBUG
̵뤵롣
.TP
.B LD_DEBUG_OUTPUT
(glibc 2.1 ʹ)
.B LD_DEBUG
νϤ񤭹ե롣
ǥեȤɸϤǤ롣
set-user-ID/set-group-ID 줿ХʥǤϡ
.B LD_DEBUG_OUTPUT
̵뤵롣
.TP
.B LD_DYNAMIC_WEAK
(glibc 2.1.19 ʹ)
񤭤夤ܥ (Τ glibc εưդˤ)
ƥͳ顢glibc 2.3.4 ʹߡ
set-user-ID/set-group-ID 줿ХʥǤ
.B LD_DYNAMIC_WEAK
̵뤵롣
.TP
.B LD_HWCAP_MASK
(glibc 2.1 ʹ)
ϡɥǽΥޥ
.TP
.B LD_KEEPDIR
(a.out Τ)(libc5)
ɤ a.out 饤֥̾ˤơǥ쥯ȥ̵뤷ʤ
ΥץѤ٤ǤϤʤ
.TP
.B LD_NOWARN
(a.out Τ)(libc5)
a.out 饤֥ˤޥʡСֹߴ
Фٹå롣
.TP
.B LD_ORIGIN_PATH
(glibc 2.1 ʹ)
ХʥؤΥѥ (set-user-ID ƤʤץˤĤ)
ƥͳ顢glibc 2.3.4 ʹߡ
set-user-ID/set-group-ID 줿ХʥǤ
.B LD_ORIGIN_PATH
̵뤵롣
.\" Only used if $ORIGIN can't be determined by normal means
.\" (from the origin path saved at load time, or from /proc/self/exe)?
.\"
.\" FIXME
.\" Document LD_POINTER_GUARD
.\" Since glibc 2.4
.\" Set to 0 to disable pointer guarding
.\" Any other value enables pointer guarding, which is also the default.
.\" Pointer guarding is a security mechanism(?) to minimize the
.\" the risk of having usable pointer in the event of a buffer overrun
.\" or stack smashing attack(?).
.\" http://article.gmane.org/gmane.comp.gdb.patches/41147/match=ld_pointer_guard
.\" http://sourceware.org/ml/gdb-patches/2008-04/msg00252.html
.\" http://www.cygwin.com/ml/libc-alpha/2006-01/msg00011.html
.TP
.B LD_PROFILE
(glibc 2.1 ʹ)
ץեԤ֥ͭȡ
ѥ֥̾ͭ̾ (soname) ǻꤵ롣
ץեνϤ
"\fI$LD_PROFILE_OUTPUT\fP/\fI$LD_PROFILE\fP.profile" Ȥ̾
ե˽񤭹ޤ롣
.TP
.B LD_PROFILE_OUTPUT
(glibc 2.1 ʹ)
.B LD_PROFILE
νϤ񤭹ޤǥ쥯ȥꡣ
ѿƤʤʸƤ硢
ǥեͤ
.I /var/tmp
Ȥʤ롣
set-user-ID/set-group-ID 줿ץǤϡ
LD_PROFILE_OUTPUT ̵뤵롣
ϥեϾ
.I /var/profile
Ѥ롣
.TP
.B LD_SHOW_AUXV
(glibc 2.1 ʹ)
ͥ뤫ϤŪ (ѥ᡼) ɽ롣
ƥͳ顢glibc 2.3.4 ʹߡ
set-user-ID/set-group-ID 줿ХʥǤ
.B LD_SHOW_AUXV
̵뤵롣
.\" FIXME
.\" Document LD_TRACE_PRELINKING (e.g.: LD_TRACE_PRELINKING=libx1.so ./prog)
.\" Since glibc 2.3
.\" Also enables DL_DEBUG_PRELINK
.TP
.B LD_USE_LOAD_BIAS
.\" http://sources.redhat.com/ml/libc-hacker/2003-11/msg00127.html
.\" Subject: [PATCH] Support LD_USE_LOAD_BIAS
.\" Jakub Jelinek
ǥեȤǤ (ĤޤꡢѿƤʤ)
¹ԥե prelink 줿֥ͭȤǤϡ餬¸
饤֥Υ١ɥ쥹ºŤ
(prelink Ƥʤ) position-independent executables (PIEs) 
¾ζ֥ͭȤǤϰ¸饤֥Υ١ɥ쥹
ºŤʤ
.B LD_USE_LOAD_BIAS
ͤ줿硢¹ԥե PIE ΤɤǤ
١ɥ쥹ºŤ롣
.B LD_USE_LOAD_BIAS
 0 줿硢¹ԥե PIE ΤɤǤ
١ɥ쥹ºŤʤ
set-user-ID  set-group-ID 줿ץǤϡ
ѿ̵뤵롣
.TP
.B LD_VERBOSE
(glibc 2.1 ʹ)
ʸǤʤˡ
.RB ( LD_TRACE_LOADED_OBJECTS
ꤹ뤫
.B \-\-list
ޤ
.B \-\-verify
ץưŪ󥫤˻ꤹ뤳Ȥˤ)
ץˤĤƤξ䤤碌ȡ
ץΥܥСɽ롣
.TP
.B LD_WARN
(ELF Τ)(glibc 2.1.3 ʹ)
ʸǤʤ硢褵Ƥʤܥ뤬зٹФ
.TP
.B LDD_ARGV0
(libc5)
.BR ldd (1)
ΰʤˡ
.IR argv [0]
ȤƻȤ͡
.SH ե
.PD 0
.TP
.I /lib/ld.so
a.out ưŪ/
.TP
.IR /lib/ld\-linux.so. { 1 , 2 }
ELF ưŪ/
.TP
.I /etc/ld.so.cache
饤֥򸡺ǥ쥯ȥ򽸤᤿ꥹȤȡ
ͭ饤֥θꥹȤޤե롣
.TP
.I /etc/ld.so.preload
ץ˥ɤ٤ ELF ͭ饤֥
ڡǶڤäꥹȤ񤫤Ƥե롣
.TP
.B lib*.so*
ͭ饤֥
.PD
.SH 
.B ld.so
εǽ libc ΥС 4.4.3 ʾѤƥѥ뤵줿
¹ԥեǻѲǽǤ롣
ELF εǽ Linux 1.1.52 ʹߤ libc5 ʹߤǻѲǽǤ롣
.SH Ϣ
.BR ldd (1),
.BR ldconfig (8)
.\" .SH 
.\" ld.so: David Engel, Eric Youngdale, Peter MacDonald, Hongjiu Lu, Linus
.\"  Torvalds, Lars Wirzenius and Mitch D'Souza
.\" ld-linux.so: Roland McGrath, Ulrich Drepper, ¾ο͡
.\"
.\" 嵭ˤơ(libc5)  David Engel 
.\" ld.so/ld-linux.so ɽƤ롣