1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" 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.\" from: @(#)mkfifo.2 6.4 (Berkeley) 7/23/91 33.\" $Id: mkfifo.2,v 1.7 1994/04/22 00:13:39 jtc Exp $ 34.\" 35.Dd July 23, 1991 36.Dt MKFIFO 2 37.Os 38.Sh NAME 39.Nm mkfifo 40.Nd make a fifo file 41.Sh SYNOPSIS 42.Fd #include <sys/types.h> 43.Fd #include <sys/stat.h> 44.Ft int 45.Fn mkfifo "const char *path" "mode_t mode" 46.Sh DESCRIPTION 47.Fn Mkfifo 48creates a new fifo file with name 49.Fa path . 50The access permissions are 51specified by 52.Fa mode 53and restricted by the 54.Xr umask 2 55of the calling process. 56.Pp 57The fifo's owner ID is set to the process's effective user ID. 58The fifo's group ID is set to that of the parent directory in 59which it is created. 60.Sh RETURN VALUES 61A 0 return value indicates success. A -1 return value 62indicates an error, and an error code is stored in 63.Va errno . 64.Sh ERRORS 65.Fn Mkfifo 66will fail and no fifo will be created if: 67.Bl -tag -width Er 68.It Bq Er EOPNOTSUPP 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 74.Dv {NAME_MAX} 75characters, or an entire path name exceeded 76.Dv {PATH_MAX} 77characters. 78.It Bq Er ENOENT 79A component of the path prefix does not exist. 80.It Bq Er EACCES 81Search permission is denied for a component of the path prefix. 82.It Bq Er ELOOP 83Too many symbolic links were encountered in translating the pathname. 84.It Bq Er EROFS 85The named file resides on a read-only file system. 86.It Bq Er EEXIST 87The named file exists. 88.It Bq Er ENOSPC 89The directory in which the entry for the new fifo is being placed 90cannot be extended because there is no space left on the file 91system containing the directory. 92.It Bq Er ENOSPC 93There are no free inodes on the file system on which the 94fifo is being created. 95.It Bq Er EDQUOT 96The directory in which the entry for the new fifo 97is being placed cannot be extended because the 98user's quota of disk blocks on the file system 99containing the directory has been exhausted. 100.It Bq Er EDQUOT 101The user's quota of inodes on the file system on 102which the fifo is being created has been exhausted. 103.It Bq Er EIO 104An 105.Tn I/O 106error occurred while making the directory entry or allocating the inode. 107.It Bq Er EIO 108An 109.Tn I/O 110error occurred while reading from or writing to the file system. 111.It Bq Er EFAULT 112.Fa Path 113points outside the process's allocated address space. 114.El 115.Sh SEE ALSO 116.Xr chmod 2 , 117.Xr stat 2 , 118.Xr umask 2 119.Sh STANDARDS 120The 121.Nm mkfifo 122function call conforms to 123.St -p1003.1-88 . 124