libc.dylibとxlib.dylibの16進ダンプを調べましたが、このファイルにこれらのライブラリのC関数のシンボルが見つかりませんでした。
私は実行可能ファイルの16進ダンプを実行し、変数と関数のシンボルがシンボルテーブルにプレーンテキストとして保存されているので、そこにある必要があるとします。
もちろん、これは私が今作業しているリンク可能なオブジェクトファイルですが、シンボルがオブジェクトファイルにない場合は、このライブラリのシンボルにリンクする方法を知りたいです。
答え1
MacOS High Sierraに見られるように：
$ ls -la libc.dylib
lrwxr-xr-x 1 root wheel 15 25 Nov 01:32 libc.dylib -> libSystem.dylib
libc.dylibへのシンボリックリンクですlibSystem.dylib。
何かを表示しようとすると、使用している項目によっては印刷できない文字やファイルの終わり文字が早期に見つかるため、libSystem.dylib多くの文字が表示されません。stringscat
これを理解するには、次の出力を参照してくださいstrings。
$ strings /usr/lib/libSystem.dylib
executable_path=
@(#)PROGRAM:System.B PROJECT:Libsystem-1252.50.4
libSystem.dylibただし、これは互いに接続された複数のライブラリのキャッシュです。
libc.dylibアルパインオプション：
$ otool -L /usr/lib/libSystem.dylib
libSystem.dylib:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
/usr/lib/system/libcache.dylib (compatibility version 1.0.0, current version 80.0.0)
/usr/lib/system/libcommonCrypto.dylib (compatibility version 1.0.0, current version 60118.50.1)
/usr/lib/system/libcompiler_rt.dylib (compatibility version 1.0.0, current version 62.0.0)
/usr/lib/system/libcopyfile.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libcorecrypto.dylib (compatibility version 1.0.0, current version 562.50.17)
/usr/lib/system/libdispatch.dylib (compatibility version 1.0.0, current version 913.50.12)
/usr/lib/system/libdyld.dylib (compatibility version 1.0.0, current version 551.3.0)
/usr/lib/system/libkeymgr.dylib (compatibility version 1.0.0, current version 28.0.0)
/usr/lib/system/liblaunch.dylib (compatibility version 1.0.0, current version 1205.50.76)
/usr/lib/system/libmacho.dylib (compatibility version 1.0.0, current version 906.0.0)
/usr/lib/system/libquarantine.dylib (compatibility version 1.0.0, current version 86.0.0)
/usr/lib/system/libremovefile.dylib (compatibility version 1.0.0, current version 45.0.0)
/usr/lib/system/libsystem_asl.dylib (compatibility version 1.0.0, current version 356.50.1)
/usr/lib/system/libsystem_blocks.dylib (compatibility version 1.0.0, current version 67.0.0)
/usr/lib/system/libsystem_c.dylib (compatibility version 1.0.0, current version 1244.50.9)
/usr/lib/system/libsystem_configuration.dylib (compatibility version 1.0.0, current version 963.50.8)
/usr/lib/system/libsystem_coreservices.dylib (compatibility version 1.0.0, current version 51.0.0)
/usr/lib/system/libsystem_darwin.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libsystem_dnssd.dylib (compatibility version 1.0.0, current version 878.50.17)
/usr/lib/system/libsystem_info.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libsystem_m.dylib (compatibility version 1.0.0, current version 3147.50.1)
/usr/lib/system/libsystem_malloc.dylib (compatibility version 1.0.0, current version 140.50.6)
/usr/lib/system/libsystem_network.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libsystem_networkextension.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libsystem_notify.dylib (compatibility version 1.0.0, current version 172.0.0)
/usr/lib/system/libsystem_sandbox.dylib (compatibility version 1.0.0, current version 765.50.51)
/usr/lib/system/libsystem_secinit.dylib (compatibility version 1.0.0, current version 30.0.0)
/usr/lib/system/libsystem_kernel.dylib (compatibility version 1.0.0, current version 4570.51.2)
/usr/lib/system/libsystem_platform.dylib (compatibility version 1.0.0, current version 161.50.1)
/usr/lib/system/libsystem_pthread.dylib (compatibility version 1.0.0, current version 301.50.1)
/usr/lib/system/libsystem_symptoms.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/system/libsystem_trace.dylib (compatibility version 1.0.0, current version 829.50.17)
/usr/lib/system/libunwind.dylib (compatibility version 1.0.0, current version 35.3.0)
/usr/lib/system/libxpc.dylib (compatibility version 1.0.0, current version 1205.50.76)
また、正しいことは@ajehも提案されています。
$ nm /usr/lib/libSystem.dylib
0000000000001a6a T R8289209$_close
0000000000001a6f T R8289209$_fork
0000000000001a74 T R8289209$_fsync
0000000000001a79 T R8289209$_getattrlist
0000000000001a7e T R8289209$_getrlimit
0000000000001a83 T R8289209$_getxattr
0000000000001a88 T R8289209$_open
0000000000001a8d T R8289209$_pthread_attr_destroy
0000000000001a92 T R8289209$_pthread_attr_init
0000000000001a97 T R8289209$_pthread_attr_setdetachstate
0000000000001a9c T R8289209$_pthread_create
0000000000001aa1 T R8289209$_pthread_mutex_lock
0000000000001aa6 T R8289209$_pthread_mutex_unlock
0000000000001aab T R8289209$_pthread_self
0000000000001ab0 T R8289209$_ptrace
0000000000001ab5 T R8289209$_read
0000000000001aba T R8289209$_setattrlist
0000000000001abf T R8289209$_setrlimit
0000000000001ac4 T R8289209$_sigaction
0000000000001ac9 T R8289209$_stat
0000000000001ace T R8289209$_sysctl
0000000000001ad3 T R8289209$_time
0000000000001ad8 T R8289209$_unlink
0000000000001add T R8289209$_write
0000000000001f98 S ___System_BVersionNumber
0000000000001f60 S ___System_BVersionString
00000000000022d0 S ___crashreporter_info__
U ___error
U ___keymgr_initializer
U ___libdarwin_init
U ___libkernel_init
U ___libplatform_init
U ___malloc_init
U ___pthread_init
U ___stack_logging_early_finished
U __asl_fork_child
U __dirhelper
U __dyld_fork_child
U __dyld_initializer
U __libSC_info_fork_child
U __libSC_info_fork_parent
U __libSC_info_fork_prepare
U __libc_fork_child
U __libc_initializer
U __libcoreservices_fork_child
U __libsecinit_initializer
U __libtrace_fork_child
U __libtrace_init
U __libxpc_initializer
U __mach_fork_child
U __malloc_fork_child
U __malloc_fork_parent
U __malloc_fork_prepare
U __notify_fork_child
U __pthread_atfork_child
U __pthread_atfork_child_handlers
U __pthread_atfork_parent
U __pthread_atfork_parent_handlers
U __pthread_atfork_prepare
U __pthread_atfork_prepare_handlers
U __pthread_clear_qos_tsd
U __pthread_exit_if_canceled
U _close
U _dispatch_atfork_child
U _dispatch_atfork_parent
U _dispatch_atfork_prepare
U _dlsym
U _dyld_get_program_sdk_version
U _exit
U _fork
U _free
U _fsync
U _getattrlist
U _getrlimit
U _getxattr
0000000000001ae2 T _libSystem_atfork_child
0000000000001a47 T _libSystem_atfork_parent
0000000000001a22 T _libSystem_atfork_prepare
000000000000194a t _libSystem_initializer
00000000000022a0 s _libSystem_initializer.libc_funcs
0000000000002220 s _libSystem_initializer.libkernel_funcs
0000000000002280 s _libSystem_initializer.libpthread_funcs
U _libdispatch_init
0000000000001b28 t _mach_init_old
00000000000022c8 D _mach_init_routine
U _malloc
U _open
U _pthread_attr_destroy
U _pthread_attr_init
U _pthread_attr_setdetachstate
U _pthread_create
U _pthread_mutex_lock
U _pthread_mutex_unlock
U _pthread_self
U _ptrace
U _read
U _realloc
U _setattrlist
U _setrlimit
U _sigaction
U _stat
U _strncmp
U _sysctl
U _time
U _unlink
U _write
U _xpc_atfork_child
U _xpc_atfork_parent
U _xpc_atfork_prepare
U dyld_stub_binder
ただし、pure nmin は次のようにlibSystem.dylib表示されます。シンボル含まれているすべてのライブラリが付属しています。
次のbashスクリプトのように1つずつ実行する方が面白いかもしれません。
#!/bin/bash
for i in `otool -L /usr/lib/libSystem.dylib | sed "1d" | awk ' { print $1 } '`
do
echo $i
echo "======="
nm $i
echo
done
または裏地として：
for i in `otool -L /usr/lib/libSystem.dylib | sed "1d" | awk ' { print $1 } '`; do echo $i; echo "=======" ; nm $i ; echo ; done
16進ダンプについてはまだ示していないので、16ビット出力について混同しているようです。
一部の文字列ダンプを表示するには、以下を試してください。
$ od -tc /usr/lib/libSystem.dylib | tr -d " " | grep -v "\\\\" | sed 's/^[0-9]*//g' | less
*
*
/usr/lib/libSyst
/system/libcache
/usr/lib/system/
libcommonCrypto.
/usr/lib/system/
libcompiler_rt.d
/usr/lib/system/
libcopyfile.dyli
/usr/lib/system/
libcorecrypto.dy
/usr/lib/system/
libdispatch.dyli
/usr/lib/system/
/system/libkeymg
/usr/lib/system/
/system/libmacho
/usr/lib/system/
libquarantine.dy
/usr/lib/system/
libremovefile.dy
/usr/lib/system/
libsystem_asl.dy
/usr/lib/system/
libsystem_blocks
/usr/lib/system/
libsystem_c.dyli
/usr/lib/system/
libsystem_config
/system/libsyste
m_coreservices.d
/usr/lib/system/
libsystem_darwin
/usr/lib/system/
libsystem_dnssd.
/usr/lib/system/
libsystem_info.d
/usr/lib/system/
libsystem_m.dyli
/usr/lib/system/
libsystem_malloc
/usr/lib/system/
libsystem_networ
/usr/lib/system/
libsystem_networ
kextension.dylib
/usr/lib/system/
libsystem_notify
/usr/lib/system/
libsystem_sandbo
/usr/lib/system/
libsystem_secini
/usr/lib/system/
libsystem_kernel
/usr/lib/system/
libsystem_platfo
/system/libsyste
/system/libsyste
m_symptoms.dylib
/usr/lib/system/
libsystem_trace.
/usr/lib/system/
/system/libxpc.d
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