Answer / sri

Unnamed pipe:
1) These are created by the shell automatically.
2) They exists in the kernel.
3) They can not be accesses by any process, including the
process that creates it.
4) They are opened at the time of creation only.
5) They are unidirectional.

Named Pipe:( also called FIFO, First In FIrst Out)
1) They are created programatically using the command mkfifo.
2) They exists in the file system with a given file name.
3) They can be viewed and accessed by any two un-related
processes. ls cmd shows "p" in the permission bits for a
named pipe.
4) They are not opened while creation.
5) They are Bi-directinoal.

6) A process writing a named pipe blocks until there is a
process that reads that data.
7) Broken pipe error occurs when the writing process closes
the named pipe while another reading process reads it.

Answer / ramprasad g

named pipe ( is commonly known as FIFO) can be used between
2 totally unrelated processes to communicate.

however pipes cannot be used by process that don't have some
common ancestry (eg parent-child).

Answer / rama

Named Pipes will still exist even after the process which
create the named pipe exit

Answer / vidya

1. Unnamed pipe: Which is what the shell uses to pipe data
between
processes
2. Named pipe: Allows two independent processes to find the pipe

Answer / ankit shah

- Pipes are opened while it is being created and named pipes are first created and then opened for writing and reading by the process.

Answer / k. jagan

Named pipe:It has only one fd(file descriptor returned by
open() function).

unnamed pipe:It has two fds(file descriptor returned by
system call pipe(),i.e p[0] for read and p[1] for write).

Answer / zee

PIPE : PIPE IS AN INTER PROCESS COMMUNICATION.
PIPE IS NOTHING BUT PASSING INFORMATION FROM ONE
PROCESS PROGRAM TO ANOTHER PROCESS.
PIPE CONSISTS OF TWO TYPES
NAMED PIPE
UNNAMED PIPE

NAMED PIPE:NAMED PIPE IS AN UNRELATED PROCESS
NAMED PIPE USES FIFO OPERATION
IT IS CREATED BY USING mkfifo
IT IS BIDIRECTIONAL
IT EXISTS IN FILE SYSTEM WITH A GIVEN FILE NAME

UNNAMED PIPE:UNNAMED PIPE IS A RELATED PROCESS
IT IS CREATED BY SHELL AUTOMATICALLY
IT IS UNIDIRECTIONAL
IT EXISTS IN KERNAL

Answer / the named one

http://www.cs.fredonia.edu/zubairi/s2k2/csit431/pipes.html
go to this link and then you can see the unnamed and named
pipes both given properly.
Unnamed pipes can be bidirectional or unidirectional both
ways . In previous Unix systems it was unidirectional that's
why it used to return two pointers but in New it is
bidirectional so it returns a pointer.

Answer / vasanth

unnamed pipe:
1)pipe is an ipc mechanism which is not having any name will be referred by the discriptors one for writing and another for reading.
2)pipe is created using pipe function.
int pipe(int filedes[2]);
3)communication between related processes.
4)it has only one fd.
5)unidirectional.
named pipe:
1)fifo is an ipc mechanism it can be said as named pipe.
2)fifo is created using mkfifo.
int mkfifo(const char *pathnam,mode_t mode);
3)communication between any two processes.
4)it has only two fd.
5)biidirectional.

Answer / jhsjksk

NAMED PIPE:A pipe whose name exist in the file system.
unnamed pipe:it does not contain any name.

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