Fix various things about SIGINT handling:

* exception handlers are now run with interrupts disabled, which avoids
  many race conditions
* fix some cases where SIGINT only aborts one command and continues the
  script, in particular if a SIGINT causes an EINTR error which trumped the
  interrupt.

Example:
  sh -c 'echo < /some/fifo; echo This should not be printed'
The fifo should not have writers. When pressing ctrl+c to abort the open,
the shell used to continue with the next command.

Example:
  sh -c '/bin/echo < /some/fifo; echo This should not be printed'
Similar. Note, however, that this particular case did not and does not work
in interactive mode with job control enabled.

1 files changed, 2 insertions, 0 deletions

diff --git a/bin/sh/error.h b/bin/sh/error.h
index 4611821..38488c2 100644
--- a/bin/sh/error.h
+++ b/bin/sh/error.h
@@ -72,6 +72,8 @@ extern volatile sig_atomic_t intpending;
 
 #define INTOFF suppressint++
 #define INTON { if (--suppressint == 0 && intpending) onint(); }
+#define is_int_on() suppressint
+#define SETINTON(s) suppressint = (s)
 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
 #define CLEAR_PENDING_INT intpending = 0
 #define int_pending() intpending