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 1.2 1993/08/01 07:42:40 mycroft 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/stat.h> 43.Ft int 44.Fn mkfifo "const char *path" "mode_t mode" 45.Sh DESCRIPTION 46.Fn Mkfifo 47creates a new fifo file with name 48.Fa path . 49The access permissions are 50specified by 51.Fa mode 52and restricted by the 53.Xr umask 2 54of the calling process. 55.Pp 56The fifo's owner ID is set to the process's effective user ID. 57The fifo's group ID is set to that of the parent directory in 58which it is created. 59.Sh RETURN VALUES 60A 0 return value indicates success. A -1 return value 61indicates an error, and an error code is stored in 62.Va errno . 63.Sh ERRORS 64.Fn Mkfifo 65will fail and no fifo will be created if: 66.Bl -tag -width ENAMETOOLO 67.It Bq Er ENOTSUPP 68The kernel has not been configured to support fifo's. 69.It Bq Er ENOTDIR 70A component of the path prefix is not a directory. 71.It Bq Er EINVAL 72The pathname contains a character with the high-order bit set. 73.It Bq Er ENAMETOOLONG 74A component of a pathname exceeded 255 characters, 75or an entire path name exceeded 1023 characters. 76.It Bq Er ENOENT 77A component of the path prefix does not exist. 78.It Bq Er EACCES 79Search permission is denied for a component of the path prefix. 80.It Bq Er ELOOP 81Too many symbolic links were encountered in translating the pathname. 82.It Bq Er EPERM 83The 84.Fa path 85argument contains a byte with the high-order bit set. 86.It Bq Er EROFS 87The named file resides on a read-only file system. 88.It Bq Er EEXIST 89The named file exists. 90.It Bq Er ENOSPC 91The directory in which the entry for the new fifo is being placed 92cannot be extended because there is no space left on the file 93system containing the directory. 94.It Bq Er ENOSPC 95There are no free inodes on the file system on which the 96fifo is being created. 97.It Bq Er EDQUOT 98The directory in which the entry for the new fifo 99is being placed cannot be extended because the 100user's quota of disk blocks on the file system 101containing the directory has been exhausted. 102.It Bq Er EDQUOT 103The user's quota of inodes on the file system on 104which the fifo is being created has been exhausted. 105.It Bq Er EIO 106An 107.Tn I/O 108error occurred while making the directory entry or allocating the inode. 109.It Bq Er EIO 110An 111.Tn I/O 112error occurred while reading from or writing to the file system. 113.It Bq Er EFAULT 114.Fa Path 115points outside the process's allocated address space. 116.El 117.Sh SEE ALSO 118.Xr chmod 2 , 119.Xr stat 2 , 120.Xr umask 2 121.Sh STANDARDS 122The 123.Nm mkfifo 124function call conforms to 125.St -p1003.1-88 . 126