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fifo(7) [centos man page]

FIFO(7) 						     Linux Programmer's Manual							   FIFO(7)

fifo - first-in first-out special file, named pipe DESCRIPTION
A FIFO special file (a named pipe) is similar to a pipe, except that it is accessed as part of the file system. It can be opened by multi- ple processes for reading or writing. When processes are exchanging data via the FIFO, the kernel passes all data internally without writ- ing it to the file system. Thus, the FIFO special file has no contents on the file system; the file system entry merely serves as a refer- ence point so that processes can access the pipe using a name in the file system. The kernel maintains exactly one pipe object for each FIFO special file that is opened by at least one process. The FIFO must be opened on both ends (reading and writing) before data can be passed. Normally, opening the FIFO blocks until the other end is opened also. A process can open a FIFO in nonblocking mode. In this case, opening for read-only will succeed even if no-one has opened on the write side yet, opening for write-only will fail with ENXIO (no such device or address) unless the other end has already been opened. Under Linux, opening a FIFO for read and write will succeed both in blocking and nonblocking mode. POSIX leaves this behavior undefined. This can be used to open a FIFO for writing while there are no readers available. A process that uses both ends of the connection in order to communicate with itself should be very careful to avoid deadlocks. NOTES
When a process tries to write to a FIFO that is not opened for read on the other side, the process is sent a SIGPIPE signal. FIFO special files can be created by mkfifo(3), and are indicated by ls -l with the file type 'p'. SEE ALSO
mkfifo(1), open(2), pipe(2), sigaction(2), signal(2), socketpair(2), mkfifo(3), pipe(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2008-12-03 FIFO(7)

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MKFIFO(3)						     Linux Programmer's Manual							 MKFIFO(3)

mkfifo - make a FIFO special file (a named pipe) SYNOPSIS
#include <sys/types.h> #include <sys/stat.h> int mkfifo(const char *pathname, mode_t mode); DESCRIPTION
mkfifo() makes a FIFO special file with name pathname. mode specifies the FIFO's permissions. It is modified by the process's umask in the usual way: the permissions of the created file are (mode & ~umask). A FIFO special file is similar to a pipe, except that it is created in a different way. Instead of being an anonymous communications chan- nel, a FIFO special file is entered into the file system by calling mkfifo(). Once you have created a FIFO special file in this way, any process can open it for reading or writing, in the same way as an ordinary file. However, it has to be open at both ends simultaneously before you can proceed to do any input or output operations on it. Opening a FIFO for reading normally blocks until some other process opens the same FIFO for writing, and vice versa. See fifo(7) for nonblocking handling of FIFO special files. RETURN VALUE
On success mkfifo() returns 0. In the case of an error, -1 is returned (in which case, errno is set appropriately). ERRORS
EACCES One of the directories in pathname did not allow search (execute) permission. EEXIST pathname already exists. This includes the case where pathname is a symbolic link, dangling or not. ENAMETOOLONG Either the total length of pathname is greater than PATH_MAX, or an individual filename component has a length greater than NAME_MAX. In the GNU system, there is no imposed limit on overall filename length, but some file systems may place limits on the length of a component. ENOENT A directory component in pathname does not exist or is a dangling symbolic link. ENOSPC The directory or file system has no room for the new file. ENOTDIR A component used as a directory in pathname is not, in fact, a directory. EROFS pathname refers to a read-only file system. CONFORMING TO
mkfifo(1), close(2), open(2), read(2), stat(2), umask(2), write(2), mkfifoat(3), fifo(7) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2008-06-12 MKFIFO(3)
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