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28626: summarize differences between two types of trap

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Peter Stephenson 2011-01-11 11:47:32 +00:00
parent dfc26195c9
commit 7541f37b63
2 changed files with 21 additions and 7 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2011-01-11 Peter Stephenson <pws@csr.com>
* 28626: Doc/Zsh/func.yo: summarise differences between two
types of trap.
2011-01-10 Peter Stephenson <pws@csr.com>
* 28617: Src/glob.c, Src/params.c, Test/E01options.ztst: NO_EXEC
@ -14094,5 +14099,5 @@
*****************************************************
* This is used by the shell to define $ZSH_PATCHLEVEL
* $Revision: 1.5178 $
* $Revision: 1.5179 $
*****************************************************

21
Doc/Zsh/func.yo
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@ -348,19 +348,28 @@ enditem()
findex(trap, use of)
The functions beginning `tt(TRAP)' may alternatively be defined with the
tt(trap) builtin: this may be preferable for some uses, as they are then
run in the environment of the calling process, rather than in their own
function environment. Apart from the difference in calling procedure and
the fact that the function form appears in lists of functions, the forms
tt(trap) builtin: this may be preferable for some uses. The forms
example(TRAPNAL+LPAR()RPAR() {
# code
})
and
('function traps') and
example(trap '
# code
' NAL)
are equivalent.
('list traps') are equivalent in most ways, the exceptions being the
following:
startitemize()
itemiz(Function traps have all the properties of normal functions,
appearing in the list of functions and being called with their own
function context rather than the context where the trap was triggered.)
itemiz(The return status from function traps is special, whereas a return
from a list trap causes the surrounding context to return with the given
status.)
itemiz(Function traps are not reset within subshells, in accordance with
zsh behaviour; list traps are reset, in accordance with POSIX behaviour.)
enditemize()