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Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
vhangup(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
vhangup() simulates a hangup on the current terminal. This call
arranges for other users to have a "clean" terminal at login time.
On success, zero is returned. On error, -1 is returned, and errno is
EPERM The calling process has insufficient privilege to call
vhangup(); the CAP_SYS_TTY_CONFIG capability is required.
This call is Linux-specific, and should not be used in programs
intended to be portable.
Linux 2007-07-26 VHANGUP(2)