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.\" @(#)mkfifo.2 6.4 (Berkeley) 7/23/91 33.\" 34.Dd July 23, 1991 35.Dt MKFIFO 2 36.Os 37.Sh NAME 38.Nm mkfifo 39.Nd make a fifo file 40.Sh SYNOPSIS 41.Fd #include <sys/stat.h> 42.Ft int 43.Fn mkfifo "const char *path" "mode_t mode" 44.Sh DESCRIPTION 45.Fn Mkfifo 46creates a new fifo file with name 47.Fa path . 48The access permissions are 49specified by 50.Fa mode 51and restricted by the 52.Xr umask 2 53of the calling process. 54.Pp 55The fifo's owner ID is set to the process's effective user ID. 56The fifo's group ID is set to that of the parent directory in 57which it is created. 58.Sh RETURN VALUES 59A 0 return value indicates success. A -1 return value 60indicates an error, and an error code is stored in 61.Va errno . 62.Sh ERRORS 63.Fn Mkfifo 64will fail and no fifo will be created if: 65.Bl -tag -width ENAMETOOLO 66.It Bq Er ENOTSUPP 67The kernel has not been configured to support fifo's. 68.It Bq Er ENOTDIR 69A component of the path prefix is not a directory. 70.It Bq Er EINVAL 71The pathname contains a character with the high-order bit set. 72.It Bq Er ENAMETOOLONG 73A component of a pathname exceeded 255 characters, 74or an entire path name exceeded 1023 characters. 75.It Bq Er ENOENT 76A component of the path prefix does not exist. 77.It Bq Er EACCES 78Search permission is denied for a component of the path prefix. 79.It Bq Er ELOOP 80Too many symbolic links were encountered in translating the pathname. 81.It Bq Er EPERM 82The 83.Fa path 84argument contains a byte with the high-order bit set. 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