BASH PATCH REPORT
			     =================

Bash-Release:	5.3
Patch-ID:	bash53-016

Bug-Reported-by:	Ethan Pini <ethan@pini.dev>
Bug-Reference-ID:	<sm8ZxfcmgU7_eiVLIsjNlax7oyAwwe1_uk2vaO0hp6nypbGnV7WStfE3rrHg_RV8BMSNRhhQmS2-7TpvzPxuK1NLLEWAyL9kbsZ2cA3nqIg=@pini.dev>
Bug-Reference-URL:	https://lists.gnu.org/archive/html/bug-bash/2026-06/msg00126.html

Bug-Description:

On recent versions of macOS, the pipe size is dynamic and changes due to
system-wide total pipe usage, so we have to check whether or not bash can
use the size determined at compile time.

Patch (apply with `patch -p0'):

*** ../bash-5.3-patched/redir.c	Fri Mar  7 18:49:37 2025
--- redir.c	Tue Jul  7 11:21:09 2026
***************
*** 473,477 ****
--- 473,500 ----
  #endif
  
+ #if defined (PIPESIZE_DYNAMIC)
+       /* If we can't count on the pipe size determined at compile time to be
+ 	 constant across systems, define PIPESIZE_DYNAMIC in configure.ac.
+ 	 We set the pipe's write end to be non-blocking, try to write, and
+ 	 fall back to a temp file on error. */
+       if (sh_setnodelay (herepipe[1]) < 0)
+ 	{
+ 	  close (herepipe[0]);
+ 	  close (herepipe[1]);
+ 	  goto use_tempfile;
+ 	}
+ #endif
+       
        r = heredoc_write (herepipe[1], document, document_len);
+ 
+ #if defined (PIPESIZE_DYNAMIC)
+       if (r == ENOSPC || r == EAGAIN)
+ 	{
+ 	  close (herepipe[0]);
+ 	  close (herepipe[1]);
+ 	  goto use_tempfile;
+ 	}
+ #endif
+ 	  
        if (document != redirectee->word)
  	free (document);
*** ../bash-5.3-patched/general.c	Wed Jun 25 15:54:35 2025
--- general.c	Tue Jul  7 11:12:10 2026
***************
*** 596,599 ****
--- 596,620 ----
  }
  
+ int
+ sh_setnodelay (int fd)
+ {
+   int flags;
+ 
+   if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
+     return -1;
+ 
+   /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present
+      and O_NDELAY is defined. */
+ #ifdef O_NONBLOCK
+   flags |= O_NONBLOCK;
+ #endif
+ 
+ #ifdef O_NDELAY
+   flags |= O_NDELAY;
+ #endif
+ 
+   return (fcntl (fd, F_SETFL, flags));
+ }
+ 
  /* Just a wrapper for the define in include/filecntl.h */
  int
*** ../bash-5.3-patched/general.h	Wed Jun 25 15:52:47 2025
--- general.h	Tue Jul  7 11:13:48 2026
***************
*** 318,321 ****
--- 318,322 ----
  
  extern int sh_unset_nodelay_mode (int);
+ extern int sh_setnodelay (int);
  extern int sh_setclexec (int);
  extern int sh_validfd (int);
*** ../bash-5.3-patched/configure.ac	Mon Jun 30 10:05:24 2025
--- configure.ac	Tue Jul  7 11:25:32 2026
***************
*** 1210,1214 ****
  isc*)		LOCAL_CFLAGS=-Disc386 ;;
  rhapsody*)	LOCAL_CFLAGS=-DRHAPSODY ;;
! darwin*)	LOCAL_CFLAGS=-DMACOSX ;;
  sco3.2v5*)	LOCAL_CFLAGS="-b elf -DWAITPID_BROKEN -DPATH_MAX=1024" ;;
  sco3.2v4*)	LOCAL_CFLAGS="-DMUST_UNBLOCK_CHLD -DPATH_MAX=1024" ;;
--- 1210,1214 ----
  isc*)		LOCAL_CFLAGS=-Disc386 ;;
  rhapsody*)	LOCAL_CFLAGS=-DRHAPSODY ;;
! darwin*)	LOCAL_CFLAGS="-DMACOSX -DPIPESIZE_DYNAMIC" ;;
  sco3.2v5*)	LOCAL_CFLAGS="-b elf -DWAITPID_BROKEN -DPATH_MAX=1024" ;;
  sco3.2v4*)	LOCAL_CFLAGS="-DMUST_UNBLOCK_CHLD -DPATH_MAX=1024" ;;
*** ../bash-5.3-patched/configure	Mon Jun 30 10:05:30 2025
--- configure	Tue Jul  7 11:25:36 2026
***************
*** 23134,23138 ****
  isc*)		LOCAL_CFLAGS=-Disc386 ;;
  rhapsody*)	LOCAL_CFLAGS=-DRHAPSODY ;;
! darwin*)	LOCAL_CFLAGS=-DMACOSX ;;
  sco3.2v5*)	LOCAL_CFLAGS="-b elf -DWAITPID_BROKEN -DPATH_MAX=1024" ;;
  sco3.2v4*)	LOCAL_CFLAGS="-DMUST_UNBLOCK_CHLD -DPATH_MAX=1024" ;;
--- 23134,23138 ----
  isc*)		LOCAL_CFLAGS=-Disc386 ;;
  rhapsody*)	LOCAL_CFLAGS=-DRHAPSODY ;;
! darwin*)	LOCAL_CFLAGS="-DMACOSX -DPIPESIZE_DYNAMIC" ;;
  sco3.2v5*)	LOCAL_CFLAGS="-b elf -DWAITPID_BROKEN -DPATH_MAX=1024" ;;
  sco3.2v4*)	LOCAL_CFLAGS="-DMUST_UNBLOCK_CHLD -DPATH_MAX=1024" ;;
*** ../bash-5.3/patchlevel.h	2020-06-22 14:51:03.000000000 -0400
--- patchlevel.h	2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 15
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 16
  
  #endif /* _PATCHLEVEL_H_ */