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#include "memory/memory.hh"
namespace memory {
buffer_t read_buffer(const std::size_t num_bytes, const pid_t& pid,
const void* const address) {
buffer_t buffer{num_bytes};
const struct iovec local {
.iov_base = std::data(buffer), .iov_len = std::size(buffer)
};
const struct iovec remote {
.iov_base = const_cast<void* const>(address), .iov_len = num_bytes
};
if (const auto read = process_vm_readv(pid, &local, 1, &remote, 1, 0);
static_cast<unsigned long>(read) != num_bytes) {
if (read == -1) {
throw std::runtime_error{"read fail - " +
std::string{strerror(errno)}};
}
throw std::runtime_error("read fail - not enough bytes read (" +
std::to_string(num_bytes) + " wanted, " +
std::to_string(read) + " read)");
}
return buffer;
}
void write_buffer(const buffer_t& buffer, const pid_t& pid,
const void* const address) {
const struct iovec local {
.iov_base = (void*)std::data(buffer), .iov_len = std::size(buffer)
};
const struct iovec remote {
.iov_base = const_cast<void* const>(address),
.iov_len = std::size(buffer)
};
if (const auto written = process_vm_writev(pid, &local, 1, &remote, 1, 0);
static_cast<unsigned long>(written) != std::size(buffer)) {
if (written == -1) {
throw std::runtime_error{"write fail - " +
std::string{strerror(errno)}};
}
throw std::runtime_error("read fail - not enough bytes written (" +
std::to_string(std::size(buffer)) +
" wanted, " + std::to_string(written) +
" written)");
}
}
} // namespace memory
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