pam_prompt 3 Linux-PAM Manual pam_prompt pam_vprompt interface to conversation function #include <security/pam_ext.h> void pam_prompt pam_handle_t *pamh int style char **response const char *fmt ... void pam_vprompt pam_handle_t *pamh int style char **response const char *fmt va_list args The pam_prompt function constructs a message from the specified format string and arguments and passes it to the conversation function as set by the service. Upon successful return, response is set to point to a string returned from the conversation function. This string is allocated on heap and should be freed. PAM_BUF_ERR Memory buffer error. PAM_CONV_ERR Conversation failure. PAM_SUCCESS Transaction was successful created. PAM_SYSTEM_ERR System error. pam8 , pam_conv3 The pam_prompt and pam_vprompt functions are Linux-PAM extensions.