external/cde
1
0
Fork 0
mirror of git://git.code.sf.net/p/cdesktopenv/code synced 2025-03-09 15:50:02 +00:00
Code Issues Releases Wiki Activity

Replace the hash alias with a proper builtin

Browse source 
This commit replaces the old hash alias with a proper builtin.
I based this builtin off of the code alias uses for handling
`alias -t --`, but with the hack for `--` removed as it has
no use in the new builtin. `alias -t --` will no longer work,
that hack is now gone.

While I was testing this builtin, I found a bug with hash tables
in non-forking subshells. If the hash table of a non-forking
subshell is changed, the parent shell's hash table is also changed.
As an example, running `(hash -r)` was resetting the parent shell's
hash table. The workaround is to force the subshell to fork if the
hash table will be changed.

src/cmd/ksh93/bltins/typeset.c:
 - Move the code for hash out of the alias builtin into a dedicated
   hash builtin. `alias -t --` is no longer supported.

src/cmd/ksh93/data/aliases.c:
 - Remove the old alias for hash from the table of predefined aliases.

src/cmd/ksh93/data/builtins.c:
 - Fix the broken entry for the hash builtin and add a man page for
   the new builtin.

src/cmd/ksh93/sh.1:
 - Replace the entry for the hash alias with a more detailed entry
   for the hash builtin.

src/cmd/ksh93/sh/name.c:
 - Force non-forking subshells to fork if the PATH is being reset
   to workaround a bug with the hash tree.

src/cmd/ksh93/tests/alias.sh:
 - Add a regression test for resetting a hash table, then adding
   a utility to the refreshed hash table.

src/cmd/ksh93/tests/subshell.sh:
 - Add regression tests for changing the hash table in subshells.

(cherry picked from commit d8428a833afe9270b61745ba3d6df355fe1d5499)
This commit is contained in:
Johnothan King 2020-06-10 04:00:35 -07:00 • committed by Martijn Dekker
parent d1bd8f89b7
commit 102868f850
10 changed files with 121 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/cmd/ksh93/sh/name.c
View file

@ -1605,12 +1605,22 @@ void nv_putval(register Namval_t *np, const char *string, int flags)
#endif /* SHOPT_FIXEDARRAY */
if(!(flags&NV_RDONLY) && nv_isattr (np, NV_RDONLY))
errormsg(SH_DICT,ERROR_exit(1),e_readonly, nv_name(np));
/* The following could cause the shell to fork if assignment
/*
* Resetting the PATH in a non-forking subshell will reset the parent shell's
* hash table, so work around the problem by forking before sh_assignok
*/
if(shp->subshell && !shp->subshare && np == PATHNOD)
sh_subfork();
/*
* The following could cause the shell to fork if assignment
* would cause a side effect
*/
shp->argaddr = 0;
if(shp->subshell && !nv_local && !(flags&NV_RDONLY))
np = sh_assignok(np,1);
if(np->nvfun && np->nvfun->disc && !(flags&NV_NODISC) && !nv_isref(np))
{
/* This function contains disc */