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The
function creates a which is an object allowing unidirectional data flow,
and allocates a pair of file descriptors. The first descriptor connects
to the of the pipe, and the second connects to the so that data written
to appears on (i.e., can be read from) This allows the output of one program
to be sent to another program: the source’s standard output is set up to
be the write end of the pipe, and the sink’s standard input is set up to
be the read end of the pipe. The pipe itself persists until all its associated
descriptors are closed. A pipe whose read or write end has been closed
is considered Writing on such a pipe causes the writing process to receive
a signal. Widowing a pipe is the only way to deliver end-of-file to a reader:
after the reader consumes any buffered data, reading a widowed pipe returns
a zero count.
On successful creation of the pipe, zero is returned.
Otherwise, a value of -1 is returned and the variable set to indicate
the error.
The call will fail if: Too many descriptors are active.
The system file table is full. The buffer is in an invalid area of the
process’s address space.
A function call appeared in
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