1.\" $NetBSD: mkfifo.2,v 1.11 1999/12/02 21:42:37 kleink 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 <sys/types.h> 46.Fd #include <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 64A 0 return value indicates success. A -1 return value 65indicates an error, and an error code is stored in 66.Va errno . 67.Sh ERRORS 68.Fn mkfifo 69will fail and no fifo will be created if: 70.Bl -tag -width Er 71.It Bq Er EOPNOTSUPP 72The kernel has not been configured to support fifo's. 73.It Bq Er ENOTDIR 74A component of the path prefix is not a directory. 75.It Bq Er ENAMETOOLONG 76A component of a pathname exceeded 77.Dv {NAME_MAX} 78characters, or an entire path name exceeded 79.Dv {PATH_MAX} 80characters. 81.It Bq Er ENOENT 82A component of the path prefix does not exist. 83.It Bq Er EACCES 84Search permission is denied for a component of the path prefix. 85.It Bq Er ELOOP 86Too many symbolic links were encountered in translating the pathname. 87.It Bq Er EROFS 88The named file resides on a read-only file system. 89.It Bq Er EEXIST 90The named file exists. 91.It Bq Er ENOSPC 92The directory in which the entry for the new fifo is being placed 93cannot be extended because there is no space left on the file 94system containing the directory. 95.It Bq Er ENOSPC 96There are no free inodes on the file system on which the 97fifo is being created. 98.It Bq Er EDQUOT 99The directory in which the entry for the new fifo 100is being placed cannot be extended because the 101user's quota of disk blocks on the file system 102containing the directory has been exhausted. 103.It Bq Er EDQUOT 104The user's quota of inodes on the file system on 105which the fifo is being created has been exhausted. 106.It Bq Er EIO 107An 108.Tn I/O 109error occurred while making the directory entry or allocating the inode. 110.It Bq Er EIO 111An 112.Tn I/O 113error occurred while reading from or writing to the file system. 114.It Bq Er EFAULT 115.Fa path 116points outside the process's allocated address space. 117.El 118.Sh SEE ALSO 119.Xr chmod 2 , 120.Xr stat 2 , 121.Xr umask 2 122.Sh STANDARDS 123The 124.Nm mkfifo 125function call conforms to 126.St -p1003.1-90 . 127