Some changes from Michael K. Johnson for Linux.
* sysdep.c (sys_siglist): Don't define this if HAVE_SYS_SIGLIST is #defined. That lets the system provide it, if it has it. * syssignal.h (sigmask): Only define this if <signal.h> hasn't given us a definition already. * syssignal.h (sys_sigpause): Fix argument in prototype. * sysdep.c (init_signals): The masks are called empty_mask and full_mask, not signal_empty_mask and signal_full_mask. (signal_handler_t): Moved .... * syssignal.h: ... to here. * systty.h (EMACS_SET_TTY_PGRP): Call tcsetpgrp with the correct arguments. * emacs.c (main): Don't try to establish signal handlers for SIGBUS and SIGSYS unless they're actually #defined.
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