mkfifo man page on FreeBSD

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MKFIFO(2)		    BSD System Calls Manual		     MKFIFO(2)

     mkfifo, mkfifoat — make a fifo file

     Standard C Library (libc, -lc)

     #include <sys/types.h>
     #include <sys/stat.h>

     mkfifo(const char *path, mode_t mode);

     mkfifoat(int fd, const char *path, mode_t mode);

     The mkfifo() system call creates a new fifo file with name path.  The
     access permissions are specified by mode and restricted by the umask(2)
     of the calling process.

     The fifo's owner ID is set to the process's effective user ID.  The
     fifo's group ID is set to that of the parent directory in which it is

     The mkfifoat() system call is equivalent to mkfifo() except in the case
     where path specifies a relative path.  In this case the newly created
     FIFO is created relative to the directory associated with the file
     descriptor fd instead of the current working directory.  If mkfifoat() is
     passed the special value AT_FDCWD in the fd parameter, the current work‐
     ing directory is used and the behavior is identical to a call to

     The mkfifo() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the

     The mkfifo() system call will fail and no fifo will be created if:

     [ENOTSUP]		The kernel has not been configured to support fifo's.

     [ENOTDIR]		A component of the path prefix is not a directory.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or
			an entire path name exceeded 1023 characters.

     [ENOENT]		A component of the path prefix does not exist.

     [EACCES]		A component of the path prefix denies search permis‐
			sion, or write permission is denied on the parent
			directory of the fifo to be created.

     [ELOOP]		Too many symbolic links were encountered in translat‐
			ing the pathname.

     [EROFS]		The named file would reside on a read-only file sys‐

     [EEXIST]		The named file exists.

     [EPERM]		The parent directory of the named file has its
			immutable flag set, see the chflags(2) manual page for
			more information.

     [ENOSPC]		The directory in which the entry for the new fifo is
			being placed cannot be extended because there is no
			space left on the file system containing the direc‐

     [ENOSPC]		There are no free inodes on the file system on which
			the fifo is being created.

     [EDQUOT]		The directory in which the entry for the new fifo is
			being placed cannot be extended because the user's
			quota of disk blocks on the file system containing the
			directory has been exhausted.

     [EDQUOT]		The user's quota of inodes on the file system on which
			the fifo is being created has been exhausted.

     [EIO]		An I/O error occurred while making the directory entry
			or allocating the inode.

     [EIO]		An I/O error occurred while reading from or writing to
			the file system.

     [EFAULT]		The path argument points outside the process's allo‐
			cated address space.

     In addition to the errors returned by the mkfifo(), the mkfifoat() may
     fail if:

     [EBADF]		The path argument does not specify an absolute path
			and the fd argument is neither AT_FDCWD nor a valid
			file descriptor open for searching.

     [ENOTDIR]		The path argument is not an absolute path and fd is
			neither AT_FDCWD nor a file descriptor associated with
			a directory.

     chflags(2), chmod(2), mknod(2), stat(2), umask(2)

     The mkfifo() system call is expected to conform to ISO/IEC 9945-1:1990
     (“POSIX.1”).  The mkfifoat() system call follows The Open Group Extended
     API Set 2 specification.

     The mkfifoat() system call appeared in FreeBSD 8.0.

BSD				April 10, 2008				   BSD

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