Oracle Solaris Modular Debugger Guide

mdb_fread() and mdb_fwrite()

ssize_t mdb_fread(void *buf, size_t nbytes, uintptr_t addr);
ssize_t mdb_fwrite(const void *buf, size_t nbytes, uintptr_t addr);

These functions provide the ability to read and write data from the object file location corresponding to the given target virtual address, specified by the addr parameter. The mdb_fread() function returns nbytes for success, or -1 for error; if a read is truncated because only a portion of the data can be read from the specified address, -1 is returned. The mdb_fwrite() function returns the number of bytes actually written upon success; -1 is returned upon error.