Defining a Global Object
The default assignment of local symbol
visibility to the objects obtained by a
dlopen
(3C) can be promoted to global
by augmenting the mode argument with the
RTLD_GLOBAL
flag. Under this
mode, any objects obtained through a
dlopen
(3C) can be used by any other
objects with world symbol search scope to locate
symbols.
In addition, any object obtained by
dlopen
(3C) with the
RTLD_GLOBAL
flag is available
for symbol lookup using dlopen()
with a path name whose value is
0
.
Note:
If a member of a group defines local symbol visibility, and is referenced by another group that defines global symbol visibility, then the object's visibility becomes a concatenation of both local and global. This promotion of attributes remains even if the global group reference is later removed.