GENERIC_PIPE_BUF_GET(9) pipes API GENERIC_PIPE_BUF_GET(9)NAME
generic_pipe_buf_get - get a reference to a struct pipe_buffer
SYNOPSIS
void generic_pipe_buf_get(struct pipe_inode_info * pipe, struct pipe_buffer * buf);
ARGUMENTS
pipe
the pipe that the buffer belongs to
buf
the buffer to get a reference to
DESCRIPTION
This function grabs an extra reference to buf. It's used in in the tee system call, when we duplicate the buffers in one pipe into another.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 GENERIC_PIPE_BUF_GET(9)
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io_pipe(3) Library Functions Manual io_pipe(3)NAME
io_pipe - create a Unix pipe
SYNTAX
#include <io.h>
int io_pipe(int64 pfd[2]);
DESCRIPTION
io_pipe creates a new UNIX ``pipe.'' The pipe can receive data and provide data; any bytes written to the pipe can then be read from the
pipe in the same order.
A pipe is typically stored in an 8192-byte memory buffer; the exact number depends on the UNIX kernel. Bytes are written to the end of the
buffer and read from the beginning of the buffer. Once a byte has been read, it is eliminated from the buffer, making space for another
byte to be written; readers cannot ``rewind'' a pipe to read old data. Once 8192 bytes have been written to the buffer, the pipe will not
be ready for further writing until some of the bytes have been read. Once all the bytes written have been read, the pipe will not be ready
for further reading until more bytes are written.
io_pipe sets d[0] to the number of a new descriptor reading from the pipe, and sets d[1] to the number of a new descriptor writing to the
pipe. It then returns 1 to indicate success. If something goes wrong, io_pipe returns 0, setting errno to indicate the error; in this case
it frees any memory that it allocated for the new pipe, and it leaves d alone.
SEE ALSO io_readfile(3), io_createfile(3), io_socketpair(3)io_pipe(3)
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