You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
1.3 KiB
Groff
29 lines
1.3 KiB
Groff
.TH io_pipe 3
|
|
.SH NAME
|
|
io_pipe \- create a Unix pipe
|
|
.SH SYNTAX
|
|
.B #include <libowfat/io.h>
|
|
|
|
int \fBio_pipe\fP(int64 pfd[2]);
|
|
.SH 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 \fId\fR[0] to the number of a new descriptor reading from the pipe, and
|
|
sets \fId\fR[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 \fId\fR alone.
|
|
.SH "SEE ALSO"
|
|
io_readfile(3), io_createfile(3), io_socketpair(3)
|