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man7/pty.7
14
man7/pty.7
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@ -85,7 +85,8 @@ in a call to
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The Linux kernel imposes a limit on the number of available
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The Linux kernel imposes a limit on the number of available
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Unix 98 pseudo-terminals.
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Unix 98 pseudo-terminals.
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In kernels up to and including 2.6.3, this limit is configured
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In kernels up to and including 2.6.3, this limit is configured
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at kernel compilation time (CONFIG_UNIX98_PTYS),
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at kernel compilation time
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.RB ( CONFIG_UNIX98_PTYS ),
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and the permitted number of pseudo-terminals can be up to 2048,
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and the permitted number of pseudo-terminals can be up to 2048,
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with a default setting of 256.
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with a default setting of 256.
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Since kernel 2.6.4, the limit is dynamically adjustable via
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Since kernel 2.6.4, the limit is dynamically adjustable via
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@ -136,8 +137,15 @@ A description of the
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which controls packet mode operation, can be found in
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which controls packet mode operation, can be found in
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.BR tty_ioctl (4).
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.BR tty_ioctl (4).
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The BSD ioctl(2)s TIOCSTOP, TIOCSTART, TIOCUCNTL, TIOCREMOTE have
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The BSD
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not been implemented under Linux.
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.BR ioctl (2)
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operations
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.BR TIOCSTOP ,
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.BR TIOCSTART ,
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.BR TIOCUCNTL ,
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and
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.BR TIOCREMOTE
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have not been implemented under Linux.
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.SH "SEE ALSO"
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.SH "SEE ALSO"
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.BR select (2),
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.BR select (2),
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.BR setsid (2),
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.BR setsid (2),
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@ -51,7 +51,7 @@ is not possible using raw sockets.
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tab(:) allbox;
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tab(:) allbox;
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c s
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c s
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l l.
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l l.
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IP Header fields modified on sending by IP_HDRINCL
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IP Header fields modified on sending by \fBIP_HDRINCL\fP
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IP Checksum:Always filled in.
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IP Checksum:Always filled in.
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Source Address:Filled in when zero.
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Source Address:Filled in when zero.
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Packet Id:Filled in when zero.
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Packet Id:Filled in when zero.
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@ -444,7 +444,8 @@ in the system.
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.I min
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.I min
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- minimum size of the receive buffer used by each TCP socket.
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- minimum size of the receive buffer used by each TCP socket.
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The default value is 4K, and is lowered to
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The default value is 4K, and is lowered to
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PAGE_SIZE bytes in low-memory systems.
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.B PAGE_SIZE
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bytes in low-memory systems.
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This value
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This value
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is used to ensure that in memory pressure mode,
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is used to ensure that in memory pressure mode,
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allocations below this size will still succeed.
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allocations below this size will still succeed.
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@ -537,7 +538,7 @@ corresponds to approximately 180 seconds.
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Enable RFC\ 1323 TCP timestamps.
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Enable RFC\ 1323 TCP timestamps.
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.TP
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.TP
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.BR tcp_tw_recycle " (Boolean; default: disabled)"
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.BR tcp_tw_recycle " (Boolean; default: disabled)"
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Enable fast recycling of TIME-WAIT sockets.
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Enable fast recycling of TIME_WAIT sockets.
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Enabling this option is not
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Enabling this option is not
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recommended since this causes problems when working
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recommended since this causes problems when working
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with NAT (Network Address Translation).
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with NAT (Network Address Translation).
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@ -545,7 +546,7 @@ with NAT (Network Address Translation).
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.\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
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.\" The following is from 2.6.12: Documentation/networking/ip-sysctl.txt
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.TP
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.TP
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.BR tcp_tw_reuse " (Boolean; default: disabled)"
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.BR tcp_tw_reuse " (Boolean; default: disabled)"
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Allow to reuse TIME-WAIT sockets for new connections when it is
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Allow to reuse TIME_WAIT sockets for new connections when it is
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safe from protocol viewpoint.
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safe from protocol viewpoint.
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It should not be changed without advice/request of technical
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It should not be changed without advice/request of technical
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experts.
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experts.
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@ -107,7 +107,8 @@ Linux's behavior is mandated by
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For compatibility with legacy code in Linux 2.0 and 2.2
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For compatibility with legacy code in Linux 2.0 and 2.2
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it was possible to set the
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it was possible to set the
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.B SO_BSDCOMPAT
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.B SO_BSDCOMPAT
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SOL_SOCKET option to receive remote errors only when the socket has been
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.B SOL_SOCKET
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option to receive remote errors only when the socket has been
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connected (except for
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connected (except for
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.B EPROTO
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.B EPROTO
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and
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and
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