1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)mkfifo.2 6.3 (Berkeley) 03/10/91 7.\" 8.Dd 9.Dt MKFIFO 2 10.Os BSD 4.4 11.Sh NAME 12.Nm mkfifo 13.Nd make a fifo file 14.Sh SYNOPSIS 15.Fd #include <sys/stat.h> 16.Ft int 17.Fn mkfifo "const char *path" "mode_t mode" 18.Sh DESCRIPTION 19.Fn Mkfifo 20creates a new fifo file with name 21.Fa path . 22The access permissions are 23specified by 24.Fa mode 25and restricted by the 26.Xr umask 2 27of the calling process. 28.Pp 29The fifo's owner ID is set to the process's effective user ID. 30The fifo's group ID is set to that of the parent directory in 31which it is created. 32.Sh RETURN VALUES 33A 0 return value indicates success. A -1 return value 34indicates an error, and an error code is stored in 35.Va errno . 36.Sh ERRORS 37.Fn Mkfifo 38will fail and no fifo will be created if: 39.Bl -tag -width ENAMETOOLO 40.It Bq Er ENOTSUPP 41The kernel has not been configured to support fifo's. 42.It Bq Er ENOTDIR 43A component of the path prefix is not a directory. 44.It Bq Er EINVAL 45The pathname contains a character with the high-order bit set. 46.It Bq Er ENAMETOOLONG 47A component of a pathname exceeded 255 characters, 48or an entire path name exceeded 1023 characters. 49.It Bq Er ENOENT 50A component of the path prefix does not exist. 51.It Bq Er EACCES 52Search permission is denied for a component of the path prefix. 53.It Bq Er ELOOP 54Too many symbolic links were encountered in translating the pathname. 55.It Bq Er EPERM 56The 57.Fa path 58argument contains a byte with the high-order bit set. 59.It Bq Er EROFS 60The named file resides on a read-only file system. 61.It Bq Er EEXIST 62The named file exists. 63.It Bq Er ENOSPC 64The directory in which the entry for the new fifo is being placed 65cannot be extended because there is no space left on the file 66system containing the directory. 67.It Bq Er ENOSPC 68There are no free inodes on the file system on which the 69fifo is being created. 70.It Bq Er EDQUOT 71The directory in which the entry for the new fifo 72is being placed cannot be extended because the 73user's quota of disk blocks on the file system 74containing the directory has been exhausted. 75.It Bq Er EDQUOT 76The user's quota of inodes on the file system on 77which the fifo is being created has been exhausted. 78.It Bq Er EIO 79An I/O error occurred while making the directory entry or allocating the inode. 80.It Bq Er EIO 81An I/O error occurred while reading from or writing to the file system. 82.It Bq Er EFAULT 83.Fa Path 84points outside the process's allocated address space. 85.El 86.Sh SEE ALSO 87.Xr chmod 2 , 88.Xr stat 2 , 89.Xr umask 2 90.Sh STANDARDS 91.Fn Mkfifo 92conforms to IEEE Std 1003.1-1988 93.Pq Dq Tn POSIX . 94