function::user_uint64_error - Linux


user_uint64_error is a helper function used to manipulate 64-bit unsigned integers. It allows programmers to read and write 64-bit unsigned integers to and from buffers and memory. This function is used in various scenarios, including data serialization, memory management, and low-level system programming.



user_uint64_error(u64 *val)


  • val: Pointer to a 64-bit unsigned integer variable




Example 1: Writing a 64-bit unsigned integer to a buffer

uint64_t value = 0x123456789ABCDEF0;
char buffer[8];
user_uint64_error(&value, buffer); // Write value to buffer

Example 2: Reading a 64-bit unsigned integer from memory

uint64_t value = 0;
user_uint64_error(&value, (char *)address); // Read value from memory

Common Issues

  • Memory Errors: Ensure that the pointer val points to a valid memory location. Attempting to access invalid memory can lead to segmentation faults or other undefined behavior.
  • Endianness: Be aware that the byte order (endianness) of the machine running the code may differ from the endianness of the target system. Consider using byte-swapping techniques if necessary.


user_uint64_error can be combined with other commands or tools for advanced tasks. For instance, it can be used in conjunction with memory allocation functions to manage dynamic data structures.

Related Commands

  • user_uint32_error: Similar function for 32-bit unsigned integers
  • user_int64_error: Similar function for 64-bit signed integers