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SCM scm_error (SCM key, char *subr, char *message, SCM args, SCM rest)
Throws an error, after converting the char * arguments to Scheme strings. subr is the Scheme name of the procedure, NULL is converted to #f. Likewise a NULL message is converted to #f.
The following procedures invoke scm_error with various error keys and arguments. The first three call scm_error with the system-error key and automatically supply errno in the "rest" argument: scm_syserror generates messages using strerror, scm_sysmissing is used when facilities are not available. Care should be taken that the errno value is not reset (e.g. due to an interrupt).
Exception handlers can also be installed from C, using scm_internal_catch, scm_lazy_catch, or scm_stack_catch from libguile/throw.c. These have not yet been documented, however the source contains some useful comments.
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