PT_PKT_ALLOC_DECODER(3)

NAME

pt_pkt_alloc_decoder, pt_pkt_free_decoder - allocate/free an Intel(R) Processor Trace packet decoder

SYNOPSIS

#include <intel-pt.h>
struct pt_packet_decoder *
pt_pkt_alloc_decoder(const struct pt_config *config);
void pt_pkt_free_decoder(struct pt_packet_decoder *decoder);

Link with -lipt.

DESCRIPTION

pt_pkt_alloc_decoder() allocates a new Intel Processor Trace (Intel PT) packet decoder and returns a pointer to it. The packet decoder decodes raw Intel PT trace into a stream of pt_packet objects. See pt_pkt_next(3).

The config argument points to a pt_config object. See pt_config(3). The config argument will not be referenced by the returned decoder but the trace buffer defined by the config argument’s begin and end fields will.

The returned packet decoder needs to be synchronized onto the trace stream before it can be used. To synchronize the packet decoder, use pt_pkt_sync_forward(3), pt_pkt_sync_backward(3), or pt_pkt_sync_set(3).

pt_pkt_free_decoder() frees the Intel PT packet decoder pointed to by decoder. The decoder argument must be NULL or point to a decoder that has been allocated by a call to pt_pkt_alloc_decoder().

RETURN VALUE

pt_pkt_alloc_decoder() returns a pointer to a pt_packet_decoder object on success or NULL in case of an error.

EXAMPLE

    int foo(const struct pt_config *config) {
        struct pt_packet_decoder *decoder;
        errcode;
        decoder = pt_pkt_alloc_decoder(config);
        if (!decoder)
            return pte_nomem;
        errcode = bar(decoder);
        pt_pkt_free_decoder(decoder);
        return errcode;
    }

SEE ALSO

pt_config(3), pt_pkt_sync_forward(3), pt_pkt_sync_backward(3), pt_pkt_sync_set(3), pt_pkt_get_offset(3), pt_pkt_get_sync_offset(3), pt_pkt_get_config(3), pt_pkt_next(3)