env points to an EnvDesc structure. EnvDesc is declared in ~nucleus/sys/common/src/lib/util/env.h.
typedef struct EnvDesc { int envSize; /* current size of environment */ int envMaxSize; /* memory available for environment */ char* envPtr; /* pointer to the environment */ } EnvDesc;
The system image contains a data file with the
initial state of the system environment variables. The env
field of the BootConf
structure references the contents of this
file.
envPtr points to a sequence of environment variable definitions. Each definition is a concatenation of two strings, envVariable and envValue, where envVariable is the null-terminated string name of an environment variable, and envValue is the null-terminated string value of the environment variable.
envSize is the size in bytes of the environment variable definition sequence.
envMaxSize is the environment file size. envSize must not exceed envMaxSize.