Hey, I find when I set daemon off and master_process off to enter the dev single process mode, env simply doesn't work. My custom module depending on that env can't find them. So I check the code and find in ngx_single_process_cycle, ngx_set_environment is not invoked. So I add it like fellow code. Maybe u can fix this little bug in your main nginx branch.

[code]
void
ngx_single_process_cycle(ngx_cycle_t *cycle)
{
ngx_uint_t i;

if (ngx_set_environment(cycle, NULL) == NULL) { <--- add this code
/* fatal */
exit(2);
}

for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->init_process) {
if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
/* fatal */
exit(2);
}
}
}
[/code]