man2/vhangup.2

   1 .\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
   2 .\"
   3 .\" SPDX-License-Identifier: Linux-man-pages-copyleft
   4 .\"
   5 .\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
   6 .\"     Added notes on capability requirements
   7 .\"
   8 .TH VHANGUP 2 2021-03-22 "Linux man-pages (unreleased)"
   9 .SH NAME
  10 vhangup \- virtually hangup the current terminal
  11 .SH LIBRARY
  12 Standard C library
  13 .RI ( libc ", " \-lc )
  14 .SH SYNOPSIS
  15 .nf
  16 .B #include <unistd.h>
  17 .PP
  18 .B int vhangup(void);
  19 .fi
  20 .PP
  21 .RS -4
  22 Feature Test Macro Requirements for glibc (see
  23 .BR feature_test_macros (7)):
  24 .RE
  25 .PP
  26 .BR vhangup ():
  27 .nf
  28     Since glibc 2.21:
  29 .\"             commit 266865c0e7b79d4196e2cc393693463f03c90bd8
  30         _DEFAULT_SOURCE
  31     In glibc 2.19 and 2.20:
  32         _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
  33     Up to and including glibc 2.19:
  34         _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
  35 .fi
  36 .SH DESCRIPTION
  37 .BR vhangup ()
  38 simulates a hangup on the current terminal.
  39 This call arranges for other
  40 users to have a \*(lqclean\*(rq terminal at login time.
  41 .SH RETURN VALUE
  42 On success, zero is returned.
  43 On error, \-1 is returned, and
  44 .I errno
  45 is set to indicate the error.
  46 .SH ERRORS
  47 .TP
  48 .B EPERM
  49 The calling process has insufficient privilege to call
  50 .BR vhangup ();
  51 the
  52 .B CAP_SYS_TTY_CONFIG
  53 capability is required.
  54 .SH STANDARDS
  55 This call is Linux-specific, and should not be used in programs
  56 intended to be portable.
  57 .SH SEE ALSO
  58 .BR init (1),
  59 .BR capabilities (7)