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31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
Error handling
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==============
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This section describes error handling in the code.
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The most common serious error is memory exhaustion. If malloc(), strdup(), etc.
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fails, clean up and free any partially complete structures leaving data in a
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consistent state, and return a value which indicates failure, eg. 0 for
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functions which return a pointer (document the value in the function
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documentation). The caller should then propagate the failure up in the same way.
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At some point, the error should stop being passed up and be reported to the user
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using
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warn_user("NoMemory", 0);
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The other common error is one returned by a RISC OS SWI. Always use "X" SWIs,
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something like this:
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os_error *error;
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error = xwimp_get_pointer_info(&pointer);
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if (error) {
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LOG(("xwimp_get_pointer_info: 0x%x: %s\n",
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error->errnum, error->errmess));
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warn_user("WimpError", error->errmess);
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return false;
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}
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If an error occurs during initialisation, in most cases exit immediately using
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die(), since this indicates that there is already insufficient memory, or a
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resource file is corrupted, etc.
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