The pam_start function creates and initializes a PAM context.
The service argument specifies the name of the policy to apply, and is stored in the PAM_SERVICE item in the created context.
The user argument specifies the name of the target user - the user the created context will serve to authenticate. It is stored in the PAM_USER item in the created context.
The pam_conv argument points to a
.Vt struct pam_conv describing the conversation function to use; see pam_conv for details.
The pam_start function returns one of the following values: