June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Unix (or local) sockets
Unix sockets fulfill most requirements and coupled with the familiarity of the sockets API, they are by far the most common mechanism.
Unix sockets are created with the AF_UNIX address family and bound to a pathname. Access to the socket is determined by the access permission of the socket file. As with internet sockets, the socket type can be SOCK_STREAM or SOCK_DGRAM, the former giving a bidirectional byte stream and the latter providing discrete messages with preserved boundaries. Unix socket datagrams are reliable, which means that they will not be dropped or reordered. The maximum size for a datagram is system-dependent and is available via /proc/sys/net/core/wmem_max. It is typically 100 KiB or more.
Unix sockets ...
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