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    Command:

    pam_start

    
    
    

    SYNOPSIS

           #include <security/pam_appl.h>
    
           int pam_start(const char *service_name, const char *user,
                         const struct pam_conv *pam_conversation,
                         pam_handle_t **pamh);
    
    
    

    DESCRIPTION

           The pam_start function creates the PAM context and initiates the PAM
           transaction. It is the first of the PAM functions that needs to be
           called by an application. The transaction state is contained entirely
           within the structure identified by this handle, so it is possible to
           have multiple transactions in parallel. But it is not possible to use
           the same handle for different transactions, a new one is needed for
           every new context.
    
           The service_name argument specifies the name of the service to apply
           and will be stored as PAM_SERVICE item in the new context. The policy
           for the service will be read from the file /etc/pam.d/service_name or,
           if that file does not exist, from /etc/pam.conf.
    
           The user argument can specify the name of the target user and will be
           stored as PAM_USER item. If the argument is NULL, the module has to ask
           for this item if necessary.
    
           The pam_conversation argument points to a struct pam_conv describing
           the conversation function to use. An application must provide this for
           direct communication between a loaded module and the application.
    
           Following a successful return (PAM_SUCCESS) the contents of pamh is a
           handle that contains the PAM context for successive calls to the PAM
           functions. In an error case is the content of pamh undefined.
    
           The pam_handle_t is a blind structure and the application should not
           attempt to probe it directly for information. Instead the PAM library
           provides the functions pam_set_item(3) and pam_get_item(3). The PAM
           handle cannot be used for mulitiple authentications at the same time as
           long as pam_end was not called on it before.
    
    
    

    RETURN VALUES

           PAM_ABORT
               General failure.
    
           PAM_BUF_ERR
               Memory buffer error.
    
           PAM_SUCCESS
               Transaction was successful created.
    
           PAM_SYSTEM_ERR
               System error, for example a NULL pointer was submitted instead of a
               pointer to data.
    
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