^C doesn't interrupt cat builtin when reading from /dev/zero

[Elliott Hughes]

bash$ ./mksh
$ cat < /dev/zero > /dev/null
^C^C^C^C^C^C^C

[Thorsten Glaser (mirabilos)]

Please make sure you have the latest version. I recall fixing it,
and it works for me right now.

[Thorsten Glaser (mirabilos)]

Oh sorry, that was *too* fast.

With redirected stdin, this indeed breaks. Huh. Will fix, thanks for pointing it out.

[Thorsten Glaser (mirabilos)]

Oh, the problem appears to be that read(2) and write(2) do not
abort with EINTR if the respective devices are fast enough ☹

Please try this patch:

Index: funcs.c
===================================================================
RCS file: /cvs/src/bin/mksh/funcs.c,v
retrieving revision 1.305
diff -u -p -r1.305 funcs.c
--- funcs.c 1 Aug 2016 21:38:02 -0000 1.305
+++ funcs.c 25 Aug 2016 16:19:19 -0000
@@ -3776,12 +3776,15 @@ c_cat(const char **wp)
     /* end of file reached */
     break;
    while (n) {
+ if (intrsig)
+ goto has_intrsig;
     if ((w = write(STDOUT_FILENO, cp, n)) != -1) {
      n -= w;
      cp += w;
      continue;
     }
     if (errno == EINTR) {
+ has_intrsig:
      restore_pipe(opipe);
      /* give the user a chance to ^C out */
      intrcheck();

[Elliott Hughes (enh-9)]

yep, works for me on both host (ubuntu) and target (android). thanks!