1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/sys/mkfifo.2,v 1.9.2.6 2001/12/14 18:34:01 ru Exp $ 34.\" 35.Dd June 4, 1993 36.Dt MKFIFO 2 37.Os 38.Sh NAME 39.Nm mkfifo 40.Nd make a fifo file 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In sys/types.h 45.In sys/stat.h 46.Ft int 47.Fn mkfifo "const char *path" "mode_t mode" 48.Sh DESCRIPTION 49.Fn Mkfifo 50creates a new fifo file with name 51.Fa path . 52The access permissions are 53specified by 54.Fa mode 55and restricted by the 56.Xr umask 2 57of the calling process. 58.Pp 59The fifo's owner ID is set to the process's effective user ID. 60The fifo's group ID is set to that of the parent directory in 61which it is created. 62.Sh RETURN VALUES 63.Rv -std mkfifo 64.Sh ERRORS 65.Fn Mkfifo 66will fail and no fifo will be created if: 67.Bl -tag -width Er 68.It Bq Er ENOTSUP 69The kernel has not been configured to support fifo's. 70.It Bq Er ENOTDIR 71A component of the path prefix is not a directory. 72.It Bq Er ENAMETOOLONG 73A component of a pathname exceeded 255 characters, 74or an entire path name exceeded 1023 characters. 75.It Bq Er ENOENT 76A component of the path prefix does not exist. 77.It Bq Er EACCES 78Search permission is denied for a component of the path prefix. 79.It Bq Er ELOOP 80Too many symbolic links were encountered in translating the pathname. 81.It Bq Er EROFS 82The named file resides on a read-only file system. 83.It Bq Er EEXIST 84The named file exists. 85.It Bq Er ENOSPC 86The directory in which the entry for the new fifo is being placed 87cannot be extended because there is no space left on the file 88system containing the directory. 89.It Bq Er ENOSPC 90There are no free inodes on the file system on which the 91fifo is being created. 92.It Bq Er EDQUOT 93The directory in which the entry for the new fifo 94is being placed cannot be extended because the 95user's quota of disk blocks on the file system 96containing the directory has been exhausted. 97.It Bq Er EDQUOT 98The user's quota of inodes on the file system on 99which the fifo is being created has been exhausted. 100.It Bq Er EIO 101An 102.Tn I/O 103error occurred while making the directory entry or allocating the inode. 104.It Bq Er EIO 105An 106.Tn I/O 107error occurred while reading from or writing to the file system. 108.It Bq Er EFAULT 109.Fa Path 110points outside the process's allocated address space. 111.El 112.Sh SEE ALSO 113.Xr chmod 2 , 114.Xr mknod 2 , 115.Xr stat 2 , 116.Xr umask 2 117.Sh STANDARDS 118The 119.Fn mkfifo 120function call is expected to conform to 121.St -p1003.1-90 . 122