1.\" $NetBSD: mkfifo.2,v 1.8 1995/02/27 12:34:27 cgd 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 SYNOPSIS 43.Fd #include <sys/types.h> 44.Fd #include <sys/stat.h> 45.Ft int 46.Fn mkfifo "const char *path" "mode_t mode" 47.Sh DESCRIPTION 48.Fn Mkfifo 49creates a new fifo file with name 50.Fa path . 51The access permissions are 52specified by 53.Fa mode 54and restricted by the 55.Xr umask 2 56of the calling process. 57.Pp 58The fifo's owner ID is set to the process's effective user ID. 59The fifo's group ID is set to that of the parent directory in 60which it is created. 61.Sh RETURN VALUES 62A 0 return value indicates success. A -1 return value 63indicates an error, and an error code is stored in 64.Va errno . 65.Sh ERRORS 66.Fn Mkfifo 67will fail and no fifo will be created if: 68.Bl -tag -width Er 69.It Bq Er EOPNOTSUPP 70The kernel has not been configured to support fifo's. 71.It Bq Er ENOTDIR 72A component of the path prefix is not a directory. 73.It Bq Er ENAMETOOLONG 74A component of a pathname exceeded 75.Dv {NAME_MAX} 76characters, or an entire path name exceeded 77.Dv {PATH_MAX} 78characters. 79.It Bq Er ENOENT 80A component of the path prefix does not exist. 81.It Bq Er EACCES 82Search permission is denied for a component of the path prefix. 83.It Bq Er ELOOP 84Too many symbolic links were encountered in translating the pathname. 85.It Bq Er EROFS 86The named file resides on a read-only file system. 87.It Bq Er EEXIST 88The named file exists. 89.It Bq Er ENOSPC 90The directory in which the entry for the new fifo is being placed 91cannot be extended because there is no space left on the file 92system containing the directory. 93.It Bq Er ENOSPC 94There are no free inodes on the file system on which the 95fifo is being created. 96.It Bq Er EDQUOT 97The directory in which the entry for the new fifo 98is being placed cannot be extended because the 99user's quota of disk blocks on the file system 100containing the directory has been exhausted. 101.It Bq Er EDQUOT 102The user's quota of inodes on the file system on 103which the fifo is being created has been exhausted. 104.It Bq Er EIO 105An 106.Tn I/O 107error occurred while making the directory entry or allocating the inode. 108.It Bq Er EIO 109An 110.Tn I/O 111error occurred while reading from or writing to the file system. 112.It Bq Er EFAULT 113.Fa Path 114points outside the process's allocated address space. 115.El 116.Sh SEE ALSO 117.Xr chmod 2 , 118.Xr stat 2 , 119.Xr umask 2 120.Sh STANDARDS 121The 122.Nm mkfifo 123function call conforms to 124.St -p1003.1-88 . 125