+/* These two can be passed to exit() or _Exit() as status values, to signal
+ successful and unsuccessful program termination, respectively. EXIT_SUCCESS
+ can be replaced by 0. How successful or unsuccessful program termination are
+ signaled to the environment, and what happens if exit() or _Exit() are being
+ called with a value that is neither of the three, is defined by the hosting
+ OS and its glue function.
+*/
+#define EXIT_SUCCESS _PDCLIB_SUCCESS
+#define EXIT_FAILURE _PDCLIB_FAILURE
+
+/* Initiate abnormal process termination, unless programm catches SIGABRT and
+ does not return from the signal handler.
+ This implementantion flushes all streams, closes all files, and removes any
+ temporary files before exiting with EXIT_FAILURE.
+ abort() does not return.
+*/
+_PDCLIB_noreturn void abort( void ) _PDCLIB_nothrow;
+
+/* Register a function that will be called on exit(), or when main() returns.
+ At least 32 functions can be registered this way, and will be called in
+ reverse order of registration (last-in, first-out).
+ Returns zero if registration is successfull, nonzero if it failed.
+*/
+int atexit( void (*func)( void ) ) _PDCLIB_nothrow;
+
+/* Normal process termination. Functions registered by atexit() (see above) are
+ called, streams flushed, files closed and temporary files removed before the
+ program is terminated with the given status. (See comment for EXIT_SUCCESS
+ and EXIT_FAILURE above.)
+ exit() does not return.
+*/
+_PDCLIB_noreturn void exit( int status ) _PDCLIB_nothrow;
+
+/* Normal process termination. Functions registered by atexit() (see above) are
+ NOT CALLED. This implementation DOES flush streams, close files and removes
+ temporary files before the program is teminated with the given status. (See
+ comment for EXIT_SUCCESS and EXIT_FAILURE above.)
+ _Exit() does not return.
+*/
+_PDCLIB_noreturn void _Exit( int status ) _PDCLIB_nothrow;
+
+/* Search an environment-provided key-value map for the given key name, and
+ return a pointer to the associated value string (or NULL if key name cannot
+ be found). The value string pointed to might be overwritten by a subsequent
+ call to getenv(). The library never calls getenv() itself.
+ Details on the provided keys and how to set / change them are determined by
+ the hosting OS and its glue function.
+*/
+char * getenv( const char * name ) _PDCLIB_nothrow;
+
+/* If string is a NULL pointer, system() returns nonzero if a command processor
+ is available, and zero otherwise. If string is not a NULL pointer, it is
+ passed to the command processor. If system() returns, it does so with a
+ value that is determined by the hosting OS and its glue function.
+*/
+int system( const char * string ) _PDCLIB_nothrow;