Module file_descriptors::pipes_and_fifos

Anonymous and named, connected unidirectional pipes_and_fifos (act like TCP connected sockets).

Since Linux 2.6.35, the default pipe capacity is 16 pages (which are 4096 bytes on x86-64), but the capacity can be queried and set using the fcntl() F_GETPIPE_SZ and F_SETPIPE_SZ operations.

The unread bytes in a pipe can be obtained using the fcntl() operation FIONREAD.

The maximum capacity that can be set for a non-privileged process (one without the CAP_SYS_RESOURCE capability) is specified in the file /proc/sys/fs/pipe-max-size; it defaults to 1Mb.

Writes of less than PIPE_BUF bytes are atomic; PIPE_BUF is 4096 bytes on Linux.

Atomic writes are significant when there are many writers sharing one named pipe (FIFO).

Structs

ReceivePipeFileDescriptor	Represents the receiving half of a pipe.
SendPipeFileDescriptor	Represents the sending half of a pipe.

Traits

SpliceRecipient	Marker trait for file descriptors that can receive from ReceivePipeFileDescriptor::splice_from().
SpliceSender	Marker trait for file descriptors that can send to SendPipeFileDescriptor::splice_to().