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* signal.c (sig_hup, sig_int, sig_quit, sig_ill, sig_trap, sig_abrt,
sig_bus, val sig_fpe, sig_kill, sig_usr1, sig_segv, sig_usr2, sig_pipe,
sig_alrm, val sig_term, sig_chld, sig_cont, sig_stop, sig_tstp,
sig_ttin, val sig_ttou, sig_urg, sig_xcpu, sig_xfsz, sigtalrm,
sig_prof, val sig_poll, sig_sys, sig_winch, sig_iot, sig_stkflt,
sig_io, sig_lost, sig_pwr): New variables.
(sig_init): New variables initialized.
* signal.h: New variables declared.
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* Makefile (OBJS-y): Include signal.o if have_posix_sigs is "y".
* configure (have_posix_sigs): New variable, set by detecting POSIX
signal stuff.
* dep.mk: Regenerated.
* arith.c, debug.c, eval.c, filter.c, hash.c, match.c, parser.y,
parser.l, rand.c, regex.c, syslog.c, txr.c, utf8.c: Include new
signal.h header, now required by unwind, and the <signal.h> system
header.
* eval.c (exit_wrap): New function.
(eval_init): New functions registered as intrinsics: exit_wrap,
set_sig_handler, get_sig_handler, sig_check.
* gc.c (release): Unused functions removed.
* gc.h (release): Declaration removed.
* lib.c (init): Call sig_init.
* stream.c (set_putc, se_getc, se_fflush): New static functions.
(stdio_put_char_callback, stdio_get_char_callback, stdio_put_byte,
stdio_flush, stdio_get_byte): Use new functions to enable
signals when blocked on I/O.
(tail_strategy): Allow signals across sleep.
(pipev_close): Allow signals across waitpid.
(se_pclose): New static function.
(pipe_close): Use new function to enable signals across pclose.
* unwind.c (uw_unwind_to_exit_point): use extended_longjmp instead of
longjmp.
* unwind.h (struct uw_block, struct uw_catch): jb member changes from
jmp_buf to extended_jmp_buf.
(uw_block_begin, uw_simple_catch_begin, uw_catch_begin): Use
extended_setjmp instead of setjmp.
* signal.c: New file.
* signal.h: New file.
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