The
pam_vprompt function constructs a string from the
fmt and
ap arguments using
vsnprintf(3), and passes it to the given PAM context's conversation function.
The
style argument specifies the type of interaction requested, and must be one of the following:
PAM_PROMPT_ECHO_OFF
Display the message and obtain the user's response without displaying it.
PAM_PROMPT_ECHO_ON
Display the message and obtain the user's response.
PAM_ERROR_MSG
Display the message as an error message, and do not wait for a response.
PAM_TEXT_INFO
Display the message as an informational message, and do not wait for a response.
A pointer to the response, or
NULL if the conversation function did not return one, is stored in the location pointed to by the
resp argument.
The message and response should not exceed
PAM_MAX_MSG_SIZE or
PAM_MAX_RESP_SIZE, respectively. If they do, they may be truncated.