diff options
Diffstat (limited to 'man7/tcp.7')
| -rw-r--r-- | man7/tcp.7 | 57 |
1 files changed, 29 insertions, 28 deletions
diff --git a/man7/tcp.7 b/man7/tcp.7 index c80d628a8d..97fb474b05 100644 --- a/man7/tcp.7 +++ b/man7/tcp.7 @@ -12,6 +12,7 @@ .\" documented: tcp_mtu_probing, tcp_base_mss, and .\" tcp_workaround_signed_windows .\" +.\" FIXME Section titles and orderings in this page are very inconsistent .TH TCP 7 2005-06-15 "Linux" "Linux Programmer's Manual" .SH NAME tcp \- TCP protocol @@ -152,7 +153,7 @@ Some of these features include support for zero-copy Explicit Congestion Notification, new management of TIME_WAIT sockets, keep-alive socket options and support for Duplicate SACK extensions. -.SH "ADDRESS FORMATS" +.SS Address Formats TCP is built on top of IP (see .BR ip (7)). The address formats defined by @@ -161,7 +162,7 @@ apply to TCP. TCP only supports point-to-point communication; broadcasting and multicasting are not supported. -.SH SYSCTLS +.SS Sysctls These variables can be accessed by the .I /proc/sys/net/ipv4/* files or with the @@ -635,7 +636,7 @@ on a socket. The default value is 128K bytes. It is lowered to 64K depending on the memory available in the system. -.SH "SOCKET OPTIONS" +.SS Socket Options To set or get a TCP socket option, call .BR getsockopt (2) to read or @@ -765,7 +766,7 @@ Bound the size of the advertised window to this value. The kernel imposes a minimum size of SOCK_MIN_RCVBUF/2. This option should not be used in code intended to be portable. -.SH IOCTLS +.SS Ioctls These following .BR ioctl (2) calls return information in @@ -826,7 +827,7 @@ returns false. Returns the amount of unsent data in the socket send queue. The socket must not be in LISTEN state, otherwise an error (EINVAL) is returned. -.SH "ERROR HANDLING" +.SS Error Handling When a network error occurs, TCP tries to resend the packet. If it doesn't succeed after some time, either .B ETIMEDOUT @@ -843,22 +844,6 @@ errors are immediately passed to the user program. Use this option with care \(em it makes TCP less tolerant to routing changes and other normal network conditions. -.SH NOTES -TCP has no real out-of-band data; it has urgent data. -In Linux this means if the other end sends newer out-of-band -data the older urgent data is inserted as normal data into -the stream (even when -.B SO_OOBINLINE -is not set). -This differs from BSD-based stacks. -.PP -Linux uses the BSD compatible interpretation of the urgent -pointer field by default. -This violates RFC\ 1122, but is -required for interoperability with other stacks. -It can be changed by the -.B tcp_stdurg -sysctl. .SH ERRORS .TP .B EPIPE @@ -878,13 +863,6 @@ was not Any errors defined for .BR ip (7) or the generic socket layer may also be returned for TCP. -.SH BUGS -Not all errors are documented. -.br -IPv6 is not described. -.\" Only a single Linux kernel version is described -.\" Info for 2.2 was lost. Should be added again, -.\" or put into a separate page. .SH VERSIONS Support for Explicit Congestion Notification, zero-copy .BR sendfile (2), @@ -896,6 +874,29 @@ were introduced in 2.3. The default values and descriptions for the sysctl variables given above are applicable for the 2.4 kernel. +.SH NOTES +TCP has no real out-of-band data; it has urgent data. +In Linux this means if the other end sends newer out-of-band +data the older urgent data is inserted as normal data into +the stream (even when +.B SO_OOBINLINE +is not set). +This differs from BSD-based stacks. +.PP +Linux uses the BSD compatible interpretation of the urgent +pointer field by default. +This violates RFC\ 1122, but is +required for interoperability with other stacks. +It can be changed by the +.B tcp_stdurg +sysctl. +.SH BUGS +Not all errors are documented. +.br +IPv6 is not described. +.\" Only a single Linux kernel version is described +.\" Info for 2.2 was lost. Should be added again, +.\" or put into a separate page. .\" .SH AUTHORS .\" This man page was originally written by Andi Kleen. .\" It was updated for 2.4 by Nivedita Singhvi with input from |