1.\" $NetBSD: mkfifo.2,v 1.15 2002/10/01 18:10:44 wiz Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93 35.\" 36.Dd June 4, 1993 37.Dt MKFIFO 2 38.Os 39.Sh NAME 40.Nm mkfifo 41.Nd make a fifo file 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include \*[Lt]sys/stat.h\*[Gt] 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 63A 0 return value indicates success. 64A -1 return value indicates an error, and an error code is stored in 65.Va errno . 66.Sh ERRORS 67.Fn mkfifo 68will fail and no fifo will be created if: 69.Bl -tag -width Er 70.It Bq Er EOPNOTSUPP 71The kernel has not been configured to support fifo's. 72.It Bq Er ENOTDIR 73A component of the path prefix is not a directory. 74.It Bq Er ENAMETOOLONG 75A component of a pathname exceeded 76.Dv {NAME_MAX} 77characters, or an entire path name exceeded 78.Dv {PATH_MAX} 79characters. 80.It Bq Er ENOENT 81A component of the path prefix does not exist. 82.It Bq Er EACCES 83Search permission is denied for a component of the path prefix. 84.It Bq Er ELOOP 85Too many symbolic links were encountered in translating the pathname. 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 -p1003.1-90 . 126