gdb.info: The F request packet

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The `F' request packet

The `F' request packet has the following format:
          `F'CALL-ID`,'PARAMETER...
     CALL-ID is the identifier to indicate the host system call to be
     called.  This is just the name of the function.
     PARAMETER... are the parameters to the system call.
   Parameters are hexadecimal integer values, either the real values in
case of scalar datatypes, as pointers to target buffer space in case of
compound datatypes and unspecified memory areas or as pointer/length
pairs in case of string parameters.  These are appended to the call-id,
each separated from its predecessor by a comma.  All values are
transmitted in ASCII string representation, pointer/length pairs
separated by a slash.