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.\" $DragonFly: src/lib/libc/sys/mkfifo.2,v 1.2 2003/06/17 04:26:47 dillon Exp $ 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.In sys/types.h 46.In sys/stat.h 47.Ft int 48.Fn mkfifo "const char *path" "mode_t mode" 49.Sh DESCRIPTION 50.Fn Mkfifo 51creates a new fifo file with name 52.Fa path . 53The access permissions are 54specified by 55.Fa mode 56and restricted by the 57.Xr umask 2 58of the calling process. 59.Pp 60The fifo's owner ID is set to the process's effective user ID. 61The fifo's group ID is set to that of the parent directory in 62which it is created. 63.Sh RETURN VALUES 64.Rv -std mkfifo 65.Sh ERRORS 66.Fn Mkfifo 67will fail and no fifo will be created if: 68.Bl -tag -width Er 69.It Bq Er ENOTSUP 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 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 EROFS 83The named file resides on a read-only file system. 84.It Bq Er EEXIST 85The named file exists. 86.It Bq Er ENOSPC 87The directory in which the entry for the new fifo is being placed 88cannot be extended because there is no space left on the file 89system containing the directory. 90.It Bq Er ENOSPC 91There are no free inodes on the file system on which the 92fifo is being created. 93.It Bq Er EDQUOT 94The directory in which the entry for the new fifo 95is being placed cannot be extended because the 96user's quota of disk blocks on the file system 97containing the directory has been exhausted. 98.It Bq Er EDQUOT 99The user's quota of inodes on the file system on 100which the fifo is being created has been exhausted. 101.It Bq Er EIO 102An 103.Tn I/O 104error occurred while making the directory entry or allocating the inode. 105.It Bq Er EIO 106An 107.Tn I/O 108error occurred while reading from or writing to the file system. 109.It Bq Er EFAULT 110.Fa Path 111points outside the process's allocated address space. 112.El 113.Sh SEE ALSO 114.Xr chmod 2 , 115.Xr mknod 2 , 116.Xr stat 2 , 117.Xr umask 2 118.Sh STANDARDS 119The 120.Fn mkfifo 121function call is expected to conform to 122.St -p1003.1-90 . 123