[PATCH] system-cancel part2

[Thomas Pfaff]

This patch will make sure that the signal handlers that are saved in the
system call are restored even if the thread got cancelled. Since
spawn_guts uses waitpid when mode is _P_WAIT spawn_guts is a cancellation
point.

Attached is the patch and a new test case.

2003-01-15  Thomas Paff  <tpfaff@gmx.net>

	* syscalls.cc (struct system_cleanup_args): New struct.
	(system_cleanup): New function.
	(system): Use pthread_cleanup_push and _pop to save and restore
	signal handlers and sigprocmask.
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