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PAM_GET_USER(3)		 BSD Library Functions Manual	       PAM_GET_USER(3)

NAME
     pam_get_user — retrieve user name

LIBRARY
     Pluggable Authentication Module Library (libpam, -lpam)

SYNOPSIS
     #include <sys/types.h>
     #include <security/pam_appl.h>

     int
     pam_get_user(pam_handle_t *pamh, const char **user, const char *prompt);

DESCRIPTION
     The pam_get_user function returns the name of the target user, as speci‐
     fied to pam_start(3).  If no user was specified, nor set using
     pam_set_item(3), pam_get_user will prompt for a user name.	 Either way, a
     pointer to the user name is stored in the location pointed to by the user
     argument.

     The prompt argument specifies a prompt to use if no user name is cached.
     If it is NULL, the PAM_USER_PROMPT item will be used.  If that item is
     also NULL, a hardcoded default prompt will be used.  Either way, the
     prompt is expanded using openpam_subst(3) before it is passed to the con‐
     versation function.

     If pam_get_user is called from a module and the user_prompt option is set
     in the policy file, the value of that option takes precedence over both
     the prompt argument and the PAM_USER_PROMPT item.

RETURN VALUES
     The pam_get_user function returns one of the following values:

     [PAM_BUF_ERR]	 Memory buffer error.

     [PAM_CONV_ERR]	 Conversation failure.

     [PAM_SYSTEM_ERR]	 System error.

SEE ALSO
     openpam_subst(3), pam(3), pam_get_authtok(3), pam_get_item(3),
     pam_set_item(3), pam_start(3), pam_strerror(3)

STANDARDS
     X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules,
     June 1997.

AUTHORS
     The pam_get_user function and this manual page were developed for the
     FreeBSD Project by ThinkSec AS and Network Associates Laboratories, the
     Security Research Division of Network Associates, Inc. under DARPA/SPAWAR
     contract N66001-01-C-8035 (“CBOSS”), as part of the DARPA CHATS research
     program.

BSD			       December 18, 2011			   BSD

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