d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

It is no longer necessary to prepend underscores to external symbols under

Browse Source 
ELF.

Submitted by:	A.Leidinger@WJPServer.CS.Uni-SB.de (Alexander Leidinger)
This commit is contained in:
joerg 1999-11-02 18:18:26 +00:00
parent 595779d84c
commit 1da0b22e43
1 changed files with 8 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
lib/libc/gen/dlopen.3
View File

@ -73,12 +73,6 @@ When an object is first loaded into the address space in this way, its
function
.Fn _init ,
if any, is called by the dynamic linker.
(Note that
.Ql _init
is the name as expressed in the C language.
From assembly language, the name would appear as
.Ql __init
instead.)
If
.Fa path
has already been placed in the address space in a previous call to
@ -124,19 +118,6 @@ character string
.Fa symbol ,
as it occurs in the shared object identified by
.Fa handle .
Note that
.Fa symbol
is the assembly language representation of the symbol name.
The assembly language representation of a C language symbol contains an
extra underscore at the beginning.
For example, the symbol
.Ql foo
in C would appear as
.Ql _foo
in assembly language, and in the
.Fa symbol
argument to
.Fn dlsym .
The symbols exported by objects added to the address space by
.Fn dlopen
can be accessed only through calls to
@ -174,7 +155,7 @@ could access the
.Dq real
.Fn getpid
with
.Li dlsym(RTLD_NEXT, \&"_getpid\&") .
.Li dlsym(RTLD_NEXT, \&"getpid\&") .
.Pp
.Fn dlerror
returns a null-terminated character string describing the last error that
@ -205,10 +186,6 @@ Just before removing a shared object in this way, the dynamic linker
calls the object's
.Fn _fini
function, if such a function is defined by the object.
As with
.Ql _init ,
.Ql _fini
is the C language name of the function.
If
.Fn dlclose
is successful, it returns a value of 0.
@ -229,6 +206,13 @@ option to
.Xr ld 1
for symbols defined in the executable to become visible to
.Fn dlsym .
.Pp
In previous implementations, it was necessary to prepend an underscore
to all external symbols in order to gain symbol
compatibility with object code compiled from the C language. This is
still the case when using the (obsolete)
.Fl aout
option to the C language compiler.
.Sh ERRORS
.Fn dlopen
and