pam_putenv - set or change PAM environment variable
int pam_putenv(pam_handle_t *pamh, const char *name_value);
The pam_putenv function is used to add or change the value of PAM environment variables as associated with the pamh handle.
The pamh argument is an authentication handle obtained by a prior call to pam_start(). The name_value argument is a single NUL terminated string of one of the following forms:
NAME=value of variable
pam_putenv() operates on a copy of name_value, which means in contrast to putenv(3), the application is responsible for freeing the data.