pam_xauth_data man page on Archlinux

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PAM_XAUTH_DATA(3)	       Linux-PAM Manual		     PAM_XAUTH_DATA(3)

       pam_xauth_data - structure containing X authentication data

       #include <security/pam_appl.h>

       struct pam_xauth_data {
	   int namelen;
	   char *name;
	   int datalen;
	   char *data;

       The pam_xauth_data structure contains X authentication data used to
       make a connection to an X display. Using this mechanism, an application
       can communicate X authentication data to PAM service modules. This
       allows modules to make a connection to the user's X display in order to
       label the user's session on login, display visual feedback or for other

       The name field contains the name of the authentication method, such as
       "MIT-MAGIC-COOKIE-1". The namelen field contains the length of this
       string, not including the trailing NUL character.

       The data field contains the authentication method-specific data
       corresponding to the specified name. The datalen field contains its
       length in bytes.

       The X authentication data can be changed with the PAM_XAUTH_DATA item.
       It can be queried and set with pam_get_item(3) and pam_set_item (3)
       respectively. The value used to set it should be a pointer to a
       pam_xauth_data structure. An internal copy of both the structure itself
       and its fields is made by PAM when setting the item.

       pam_start(3), pam_get_item(3),

       The pam_xauth_data structure and PAM_XAUTH_DATA item are Linux-PAM

Linux-PAM Manual		  09/19/2013		     PAM_XAUTH_DATA(3)

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