Pam service function to start session management
#define PAM_SM_SESSION
#include <security/pam_modules.h>
PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv);
The pam_sm_open_session function is the service module's implementation of the pam_open_session(3) interface.
This function is called to commence a session. The only valid value for flags is zero or:
PAM_SILENT
Do not emit any messages.
PAM_SESSION_ERR
Cannot make/remove an entry for the specified session.
PAM_SUCCESS
The session was successfully started.