Function risc0_zkvm_platform::syscall::sys_getenv

#[no_mangle]
pub unsafe extern "C" fn sys_getenv(
    out_words: *mut u32,
    out_nwords: usize,
    varname: *const u8,
    varname_len: usize
) -> usize

Retrieves the value of an environment variable, and stores as much of it as it can it in the memory at [out_words, out_words + out_nwords). Returns the length of the value.

This is normally called twice to read an environment variable: Once to get the length of the value, and once to fill in allocated memory.