On 9/16/16 1:51 AM, Eric Pruitt wrote:
> Bash Version: 4.4
> Patch Level: 0
> Release Status: release
>
> Description:
> I have a script that execute `if [[ "$(<"/proc/$1/cmdline")" = tmux*
> ]];`.
> All /proc/*/cmdline include null bytes, and as of Bash 4.4, this
> results in
> a warning being spewed on stderr which did not happen in Bash 4.3.
>
> Repeat-By:
> echo "$(<"/proc/$$/cmdline")"
>
> Fix:
> Is this even an intentional change? I looked at some of the other
> internal_warning invocations, and they were commented out using "#if 0
> ...
> #endif."
Try the attached patch, which reduces the number of warnings to 1 per call
to command substitution.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
*** ../bash-4.4/subst.c 2016-08-30 16:46:38.000000000 -0400
--- subst.c 2016-09-26 10:20:19.000000000 -0400
***************
*** 5932,5935 ****
--- 5933,5937 ----
int istring_index, istring_size, c, tflag, skip_ctlesc, skip_ctlnul;
ssize_t bufn;
+ int nullbyte;
istring = (char *)NULL;
***************
*** 5939,5942 ****
--- 5941,5946 ----
skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL;
+ nullbyte = 0;
+
/* Read the output of the command through the pipe. This may need to be
changed to understand multibyte characters in the future. */
***************
*** 5957,5961 ****
{
#if 1
! internal_warning ("%s", _("command substitution: ignored null byte in input"));
#endif
continue;
--- 5961,5969 ----
{
#if 1
! if (nullbyte == 0)
! {
! internal_warning ("%s", _("command substitution: ignored null byte in input"));
! nullbyte = 1;
! }
#endif
continue;
