Transcribing an environment to that of pam
#include <security/pam_misc.h>
int pam_misc_paste_env(pam_handle_t *pamh, const char * const *user);
This function takes the supplied list of environment pointers and uploads its contents to the PAM environment. Success is indicated by PAM_SUCCESS.
pam_putenv(3), pam(7)
The pam_misc_paste_env function is part of the libpam_misc Library and not defined in any standard.