|Linux Standard Base Core Specification 4.0|
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pam_fail_delay() specifies the minimum delay for the PAM library to use when an authentication error occurs. The actual delay can vary by as much at 25%. If this function is called multiple times, the longest time specified by any of the call will be used.
The delay is invoked if an authentication error occurs during the pam_authenticate() or pam_chauthtok() function calls.
Independent of the success of pam_authenticate() or pam_chauthtok(), the delay time is reset to its default value of 0 when the PAM library returns control to the application from these two functions.
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