void g_atexit ( GVoidFunc func )
Specifies a function to be called at normal program termination.
Since GLib 2.8.2, on Windows
g_atexit() actually is a preprocessor
macro that maps to a call to the
atexit() function in the C
library. This means that in case the code that calls
atexit(), is in a DLL, the function will be called when the
DLL is detached from the program. This typically makes more sense
than that the function is called when the GLib DLL is detached,
which happened earlier when
g_atexit() was a function in the GLib
The behaviour of
atexit() in the context of dynamically loaded
modules is not formally specified and varies wildly.
On POSIX systems, calling
atexit()) in a dynamically
loaded module which is unloaded before the program terminates might
well cause a crash at program exit.
Some POSIX systems implement
atexit() like Windows, and have each
dynamically loaded module maintain an own atexit chain that is
called when the module is unloaded.
On other POSIX systems, before a dynamically loaded module is unloaded, the registered atexit functions (if any) residing in that module are called, regardless where the code that registered them resided. This is presumably the most robust approach.
As can be seen from the above, for portability it’s best to avoid
atexit()) except in the main executable of a program.
It is best to avoid
The function to call on normal program termination.