signal, exec, wait, pid: improvements, especially to exec

- fix popen [open "|pipeline ..."] to return meaningful status in close
  (but note that stderr is not captured)
- popen pipelines can now be used as the target of exec redirection
- overally improvements to exec on windows. Now crt file descriptors
  are used throughout
- add support for [pid], [wait] and popen on windows
- os.wait is now wait, and integrates with [exec ... &] to be able
  to wait for running background tasks
- [socket pipe] is now also [pipe] and is supported on windows
- [file tempfile] is supported on windows
- move duplicated code between jim-aio.c and jim-exec.c to jimiocompat.c
- Fix [exec] on windows to match unix semantics wrt sharing the parent stream
  unless redirected rather than using /dev/null
- On windows redirect to or from /dev/null is automatically converted to NUL:
- If signal support is disabled, implement a minimal Jim_SignalId() for exec and wait
- aio now supports getfd, to return the underlying file descriptor.
  This is used by exec to support redirection, and allows popen channels
  to support exec redirection.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/auto.def b/auto.def
index 4b454be..d1b26f9 100644
--- a/auto.def
+++ b/auto.def
@@ -354,7 +354,7 @@ dict set extdb info {
     sdl      { pkg-config SDL_gfx check {[cc-check-function-in-lib SDL_SetVideoMode SDL] && [cc-check-function-in-lib rectangleRGBA SDL_gfx]}
                libdep {lib_SDL_SetVideoMode lib_rectangleRGBA}
              }
-    signal   { check {[have-feature sigaction] && [have-feature vfork]} }
+    signal   { check {[have-feature sigaction]} }
     sqlite3  { pkg-config sqlite3 check {[cc-check-function-in-lib sqlite3_prepare_v2 sqlite3]} libdep lib_sqlite3_prepare_v2 }
     zlib     { pkg-config zlib check {[cc-check-function-in-lib deflate z]} libdep lib_deflate }
     syslog   { check {[have-feature syslog]} }
@@ -434,6 +434,11 @@ if {$jimregexp || [opt-bool jim-regexp]} {
     }
 }
 
+# poor-man's signals
+if {"signal" ni $extinfo(static-c)} {
+    lappend extra_objs jim-nosignal.o
+}
+
 if {[ext-get-status load] eq "n"} {
     # If we don't have load, no need to support shared objects
     define SH_LINKFLAGS ""