# phpman > man > pam_set_item(3) [PAM_SET_ITEM(3)](https://www.chedong.com/phpMan.php/man/PAMSETITEM/3/markdown) Linux-PAM Manual [PAM_SET_ITEM(3)](https://www.chedong.com/phpMan.php/man/PAMSETITEM/3/markdown) ## NAME pam_set_item - set and update PAM information ## SYNOPSIS **#include** **** **int** **pam**___**set**___**item(pam**___**handle**___**t** *****_pamh_**,** **int** _item_type_**,** **const** **void** *****_item_**);** ## DESCRIPTION The **pam**___**set**___**item** function allows applications and PAM service modules to access and to update PAM information of _item_type_. For this a copy of the object pointed to by the _item_ argument is created. The following _item_type_s are supported: PAM_SERVICE The service name (which identifies that PAM stack that the PAM functions will use to authenticate the program). PAM_USER The username of the entity under whose identity service will be given. That is, following authentication, _PAM_USER_ identifies the local entity that gets to use the service. Note, this value can be mapped from something (eg., "anonymous") to something else (eg. "guest119") by any module in the PAM stack. As such an application should consult the value of _PAM_USER_ after each call to a PAM function. PAM_USER_PROMPT The string used when prompting for a user's name. The default value for this string is a localized version of "login: ". PAM_TTY The terminal name: prefixed by /dev/ if it is a device file; for graphical, X-based, applications the value for this item should be the _$DISPLAY_ variable. PAM_RUSER The requesting user name: local name for a locally requesting user or a remote user name for a remote requesting user. Generally an application or module will attempt to supply the value that is most strongly authenticated (a local account before a remote one. The level of trust in this value is embodied in the actual authentication stack associated with the application, so it is ultimately at the discretion of the system administrator. _PAM_RUSER@PAM_RHOST_ should always identify the requesting user. In some cases, _PAM_RUSER_ may be NULL. In such situations, it is unclear who the requesting entity is. PAM_RHOST The requesting hostname (the hostname of the machine from which the _PAM_RUSER_ entity is requesting service). That is _PAM_RUSER@PAM_RHOST_ does identify the requesting user. In some applications, _PAM_RHOST_ may be NULL. In such situations, it is unclear where the authentication request is originating from. PAM_AUTHTOK The authentication token (often a password). This token should be ignored by all module functions besides **pam**___**sm**___**[authenticate**(3)](https://www.chedong.com/phpMan.php/man/authenticate/3/markdown) and **pam**___**sm**___**[chauthtok**(3)](https://www.chedong.com/phpMan.php/man/chauthtok/3/markdown). In the former function it is used to pass the most recent authentication token from one stacked module to another. In the latter function the token is used for another purpose. It contains the currently active authentication token. PAM_OLDAUTHTOK The old authentication token. This token should be ignored by all module functions except **pam**___**sm**___**[chauthtok**(3)](https://www.chedong.com/phpMan.php/man/chauthtok/3/markdown). PAM_CONV The pam_conv structure. See **pam**___**[conv**(3)](https://www.chedong.com/phpMan.php/man/conv/3/markdown). The following additional items are specific to Linux-PAM and should not be used in portable applications: PAM_FAIL_DELAY A function pointer to redirect centrally managed failure delays. See **pam**___**fail**___**[delay**(3)](https://www.chedong.com/phpMan.php/man/delay/3/markdown). PAM_XDISPLAY The name of the X display. For graphical, X-based applications the value for this item should be the _$DISPLAY_ variable. This value may be used independently of _PAM_TTY_ for passing the name of the display. PAM_XAUTHDATA A pointer to a structure containing the X authentication data required to make a connection to the display specified by _PAM_XDISPLAY_, if such information is necessary. See **pam**___**xauth**___**[data**(3)](https://www.chedong.com/phpMan.php/man/data/3/markdown). PAM_AUTHTOK_TYPE The default action is for the module to use the following prompts when requesting passwords: "New UNIX password: " and "Retype UNIX password: ". The example word _UNIX_ can be replaced with this item, by default it is empty. This item is used by **pam**___**get**___**[authtok**(3)](https://www.chedong.com/phpMan.php/man/authtok/3/markdown). For all _item_type_s, other than PAM_CONV and PAM_FAIL_DELAY, _item_ is a pointer to a terminated character string. In the case of PAM_CONV, _item_ points to an initialized _pam_conv_ structure. In the case of PAM_FAIL_DELAY, _item_ is a function pointer: **void** **(*delay**___**fn)(int** **retval,** **unsigned** **usec**___**delay,** **void** ***appdata**___**ptr)** Both, PAM_AUTHTOK and PAM_OLDAUTHTOK, will be reset before returning to the application. Which means an application is not able to access the authentication tokens. ## RETURN VALUES PAM_BAD_ITEM The application attempted to set an undefined or inaccessible item. PAM_BUF_ERR Memory buffer error. PAM_SUCCESS Data was successful updated. PAM_SYSTEM_ERR The _pam_handle_t_ passed as first argument was invalid. ## SEE ALSO **pam**___**get**___**[item**(3)](https://www.chedong.com/phpMan.php/man/item/3/markdown), **pam**___**[strerror**(3)](https://www.chedong.com/phpMan.php/man/strerror/3/markdown) Linux-PAM Manual 06/08/2020 [PAM_SET_ITEM(3)](https://www.chedong.com/phpMan.php/man/PAMSETITEM/3/markdown)