Set the CPU registers with the values provided for the process associated with the file descriptor. You must have opened the file descriptor for writing. The argument is a pointer to a procfs_greg structure (see debug_greg_t in <sys/debug.h>) that specifies the values to assign to the CPU registers. For example:

procfs_greg my_greg;

/* Set the members of my_greg as required. */
devctl( fd, DCMD_PROC_SETGREG, my_greg, sizeof(procfs_greg),

To get the CPU registers, use DCMD_PROC_GETGREG .