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, 1 insertions, 1 deletions

diff --git a/bin/sh/parser.c b/bin/sh/parser.c
index 5218dc0..855becc 100644
--- a/bin/sh/parser.c
+++ b/bin/sh/parser.c
@@ -1312,6 +1312,7 @@ parsebackq: {
 	int saveprompt;
 	const int bq_startlinno = plinno;
 
+	str = NULL;
 	if (setjmp(jmploc.loc)) {
 		if (str)
 			ckfree(str);
@@ -1323,7 +1324,6 @@ parsebackq: {
 		longjmp(handler->loc, 1);
 	}
 	INTOFF;
-	str = NULL;
 	savelen = out - stackblock();
 	if (savelen > 0) {
 		str = ckmalloc(savelen);