First cut at signal handling support.

* 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.

1 files changed, 16 insertions, 0 deletions

diff --git a/lib.c b/lib.c
index 16e5d08e..245c864f 100644
--- a/lib.c
+++ b/lib.c
@@ -36,7 +36,9 @@
 #include <wchar.h>
 #include <math.h>
 #include <time.h>
+#include <signal.h>
 #include <sys/time.h>
+#include <assert.h>
 #include "config.h"
 #ifdef HAVE_GETENVIRONMENTSTRINGS
 #define NOMINMAX
@@ -47,6 +49,7 @@
 #include "arith.h"
 #include "rand.h"
 #include "hash.h"
+#include "signal.h"
 #include "unwind.h"
 #include "stream.h"
 #include "utf8.h"
@@ -1082,6 +1085,9 @@ static mem_t *malloc_low_bound, *malloc_high_bound;
 mem_t *chk_malloc(size_t size)
 {
   mem_t *ptr = (mem_t *) malloc(size);
+
+  assert (!async_sig_enabled);
+
   if (size && ptr == 0)
     ptr = (mem_t *) oom_realloc(0, size);
   if (ptr < malloc_low_bound)
@@ -1094,6 +1100,9 @@ mem_t *chk_malloc(size_t size)
 mem_t *chk_calloc(size_t n, size_t size)
 {
   mem_t *ptr = (mem_t *) calloc(n, size);
+
+  assert (!async_sig_enabled);
+
   if (size && ptr == 0) {
     ptr = (mem_t *) oom_realloc(0, size);
     memset(ptr, 0, n * size);
@@ -1108,6 +1117,9 @@ mem_t *chk_calloc(size_t n, size_t size)
 mem_t *chk_realloc(mem_t *old, size_t size)
 {
   mem_t *newptr = (mem_t *) realloc(old, size);
+
+  assert (!async_sig_enabled);
+
   if (size != 0 && newptr == 0)
     newptr = oom_realloc(old, size);
   if (newptr < malloc_low_bound)
@@ -1126,6 +1138,7 @@ wchar_t *chk_strdup(const wchar_t *str)
 {
   size_t nchar = wcslen(str) + 1;
   wchar_t *copy = (wchar_t *) chk_malloc(nchar * sizeof *copy);
+  assert (!async_sig_enabled);
   wmemcpy(copy, str, nchar);
   return copy;
 }
@@ -5188,6 +5201,9 @@ void init(const wchar_t *pn, mem_t *(*oom)(mem_t *, size_t),
 
   oom_realloc = oom;
   gc_init(stack_bottom);
+#if HAVE_POSIX_SIGS
+  sig_init();
+#endif
   obj_init();
   arith_init();
   rand_init();