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https://github.com/NixOS/nix
synced 2025-06-29 06:21:14 +02:00
61381c9964
The documentation "solved" this by specifying a precondition, but let's just make it more robust, and not leak irrelevant messages that might linger. We don't clear the message when clearing the status, in order to keep clearing fast; see last_err field doc.
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#ifndef NIX_API_UTIL_INTERNAL_H
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#define NIX_API_UTIL_INTERNAL_H
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#include <string>
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#include <optional>
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#include "error.hh"
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#include "nix_api_util.h"
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struct nix_c_context
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{
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nix_err last_err_code = NIX_OK;
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/** The last error message. Always check last_err_code. This may not have been cleared, so that clearing is fast. */
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std::optional<std::string> last_err = {};
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std::optional<nix::ErrorInfo> info = {};
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std::string name = "";
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};
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nix_err nix_context_error(nix_c_context * context);
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/**
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* Internal use only.
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*
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* Helper to invoke nix_get_string_callback
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* @param context optional, the context to store errors in if this function
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* fails
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* @param str The string to observe
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* @param callback Called with the observed string.
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* @param user_data optional, arbitrary data, passed to the callback when it's called.
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* @return NIX_OK if there were no errors.
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* @see nix_get_string_callback
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*/
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nix_err call_nix_get_string_callback(const std::string str, nix_get_string_callback callback, void * user_data);
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#define NIXC_CATCH_ERRS \
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catch (...) \
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{ \
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return nix_context_error(context); \
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} \
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return NIX_OK;
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#define NIXC_CATCH_ERRS_RES(def) \
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catch (...) \
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{ \
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nix_context_error(context); \
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return def; \
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}
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#define NIXC_CATCH_ERRS_NULL NIXC_CATCH_ERRS_RES(nullptr)
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#endif // NIX_API_UTIL_INTERNAL_H
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