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author | Steve Vinoski <[email protected]> | 2011-02-22 18:07:57 -0500 |
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committer | Sverker Eriksson <[email protected]> | 2011-03-24 16:45:50 +0100 |
commit | b02f03c979cda37e43828cd6e1787649f1d8ca8c (patch) | |
tree | 6ebe11e92b89c6a78830db053a14f0f1a5edb63a /lib/appmon/vsn.mk | |
parent | d9932cbb82954532fb39ffaa05cde74a6ec8869c (diff) | |
download | otp-b02f03c979cda37e43828cd6e1787649f1d8ca8c.tar.gz otp-b02f03c979cda37e43828cd6e1787649f1d8ca8c.tar.bz2 otp-b02f03c979cda37e43828cd6e1787649f1d8ca8c.zip |
add support for checking if an ERL_NIF_TERM is an exception
Add the enif_is_exception function to allow callers to determine
whether an ERL_NIF_TERM represents an exception. (Currently the only
supported exception is badarg since only enif_make_badarg exists, but
this will likely be expanded in future releases.) This allows NIF code
to call other NIF functions that return ERL_NIF_TERM and properly
check to see if the returned terms are exceptions. Without the
enif_is_exception function, developers have to create their own means
of checking whether a function creates an exception, such as returning
boolean success/failure indicators or some other special value
indicating that an exception is in effect.
The declaration of enif_is_exception in erl_nif_api_funcs.h respects
the order of declarations required to keep compatibility on Windows.
Add a new test to verify the operation of enif_is_exception.
Modify the erl_nif man page to add a description of enif_is_exception
and also to clarify the requirements of calling the enif_make_badarg
function. If code calls enif_make_badarg, the env passed in gets set
with exception information and so the return value of the calling
function MUST be the badarg term returned from enif_make_badarg. Also
clarify that the result of enif_make_badarg may be passed only to
enif_is_exception and not to any other NIF API functions.
Diffstat (limited to 'lib/appmon/vsn.mk')
0 files changed, 0 insertions, 0 deletions