| [9] | 1 | .\" Copyright (c) 1980 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)mknod.2 6.4 (Berkeley) 5/23/86
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| 6 | .\"
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| 7 | .TH MKNOD 2 "May 23, 1986"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | mknod, mkfifo \- make a special file
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <sys/types.h>
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| 15 | #include <unistd.h>
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| 16 | #include <sys/stat.h>
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| 17 |
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| 18 | int mknod(const char *\fIpath\fP, mode_t \fImode\fP, dev_t \fIdev\fP)
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| 19 | int mkfifo(const char *\fIpath\fP, mode_t \fImode\fP)
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| 20 | .fi
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| 21 | .ft R
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| 22 | .SH DESCRIPTION
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| 23 | .B Mknod
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| 24 | creates a new file
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| 25 | whose name is
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| 26 | .I path.
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| 27 | The mode of the new file
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| 28 | (including special file bits)
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| 29 | is initialized from
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| 30 | .IR mode ,
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| 31 | as defined in
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| 32 | .IR <sys/stat.h> .
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| 33 | (The protection part of the mode
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| 34 | is modified by the process's mode mask (see
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| 35 | .BR umask (2))).
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| 36 | The first block pointer of the i-node
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| 37 | is initialized from
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| 38 | .I dev
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| 39 | and is used to specify which device the special file
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| 40 | refers to.
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| 41 | .PP
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| 42 | If mode indicates a block or character special file,
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| 43 | .I dev
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| 44 | is the device number of a character or block I/O device.
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| 45 | The low eight bits of the device number hold the minor device number
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| 46 | that selects a device among the devices governed by the same driver.
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| 47 | The driver is selected by the major device number, the next eight bits
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| 48 | of the device number.
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| 49 | .PP
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| 50 | If
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| 51 | .I mode
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| 52 | does not indicate a block special or character special device,
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| 53 | .I dev
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| 54 | is ignored.
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| 55 | (For example, when creating a ``fifo'' special file.)
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| 56 | .PP
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| 57 | .B Mknod
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| 58 | may be invoked only by the super-user,
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| 59 | unless it is being used to create a fifo.
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| 60 | .PP
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| 61 | The call
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| 62 | .BI "mkfifo(" path ", " mode ")"
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| 63 | is equivalent to
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| 64 | .PP
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| 65 | .RS
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| 66 | .BI "mknod(" path ", (" mode " & 0777) | S_IFIFO, 0)"
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| 67 | .RE
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| 68 | .SH "RETURN VALUE
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| 69 | Upon successful completion a value of 0 is returned.
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| 70 | Otherwise, a value of \-1 is returned and \fBerrno\fP
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| 71 | is set to indicate the error.
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| 72 | .SH ERRORS
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| 73 | .B Mknod
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| 74 | will fail and the file mode will be unchanged if:
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| 75 | .TP 15
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| 76 | [ENOTDIR]
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| 77 | A component of the path prefix is not a directory.
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| 78 | .TP 15
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| 79 | [ENAMETOOLONG]
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| 80 | The path name exceeds PATH_MAX characters.
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| 81 | .TP 15
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| 82 | [ENOENT]
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| 83 | A component of the path prefix does not exist.
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| 84 | .TP 15
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| 85 | [EACCES]
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| 86 | Search permission is denied for a component of the path prefix.
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| 87 | .TP 15
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| 88 | [ELOOP]
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| 89 | Too many symbolic links were encountered in translating the pathname.
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| 90 | (Minix-vmd)
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| 91 | .TP 15
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| 92 | [EPERM]
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| 93 | The process's effective user ID is not super-user.
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| 94 | .TP 15
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| 95 | [EIO]
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| 96 | An I/O error occurred while making the directory entry or allocating the inode.
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| 97 | .TP 15
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| 98 | [ENOSPC]
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| 99 | The directory in which the entry for the new node is being placed
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| 100 | cannot be extended because there is no space left on the file
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| 101 | system containing the directory.
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| 102 | .TP 15
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| 103 | [ENOSPC]
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| 104 | There are no free inodes on the file system on which the
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| 105 | node is being created.
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| 106 | .ig
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| 107 | .TP 15
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| 108 | [EDQUOT]
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| 109 | The directory in which the entry for the new node
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| 110 | is being placed cannot be extended because the
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| 111 | user's quota of disk blocks on the file system
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| 112 | containing the directory has been exhausted.
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| 113 | .TP 15
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| 114 | [EDQUOT]
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| 115 | The user's quota of inodes on the file system on
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| 116 | which the node is being created has been exhausted.
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| 117 | ..
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| 118 | .TP 15
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| 119 | [EROFS]
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| 120 | The named file resides on a read-only file system.
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| 121 | .TP 15
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| 122 | [EEXIST]
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| 123 | The named file exists.
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| 124 | .TP 15
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| 125 | [EFAULT]
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| 126 | .I Path
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| 127 | points outside the process's allocated address space.
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| 128 | .SH "SEE ALSO"
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| 129 | .BR chmod (2),
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| 130 | .BR stat (2),
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| 131 | .BR umask (2).
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