| 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 | .\" @(#)creat.2 6.6 (Berkeley) 5/22/86
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| 6 | .\"
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| 7 | .TH CREAT 2 "May 22, 1986"
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| 8 | .UC 4
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| 9 | .SH NAME
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| 10 | creat \- create a new 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 <fcntl.h>
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| 16 |
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| 17 | int creat(const char *\fIname\fP, mode_t \fImode\fP)
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| 18 | .ft R
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| 19 | .fi
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| 20 | .SH DESCRIPTION
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| 21 | .ft B
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| 22 | This interface is made obsolete by open(2), it is equivalent to
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| 23 | .ft R
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| 24 | .PP
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| 25 | .RS
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| 26 | open(\fIname\fP, O_WRONLY | O_CREAT | O_TRUNC, \fImode\fP)
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| 27 | .RE
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| 28 | .PP
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| 29 | .B Creat
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| 30 | creates a new file or prepares to rewrite an existing
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| 31 | file called
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| 32 | .IR name ,
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| 33 | given as the address of a null-terminated string.
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| 34 | If the file did not exist, it is given
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| 35 | mode
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| 36 | .IR mode ,
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| 37 | as modified by the process's mode mask (see
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| 38 | .BR umask (2)).
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| 39 | Also see
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| 40 | .BR chmod (2)
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| 41 | for the
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| 42 | construction of the
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| 43 | .I mode
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| 44 | argument.
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| 45 | .PP
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| 46 | If the file did exist, its mode and owner remain unchanged
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| 47 | but it is truncated to 0 length.
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| 48 | .PP
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| 49 | The file is also opened for writing, and its file descriptor
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| 50 | is returned.
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| 51 | .SH NOTES
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| 52 | The
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| 53 | .I mode
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| 54 | given is arbitrary; it need not allow
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| 55 | writing.
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| 56 | This feature has been used in the past by
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| 57 | programs to construct a simple, exclusive locking
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| 58 | mechanism. It is replaced by the O_EXCL open
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| 59 | mode, or the advisory locking of the
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| 60 | .BR fcntl (2)
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| 61 | facility.
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| 62 | .SH "RETURN VALUE
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| 63 | The value \-1 is returned if an error occurs. Otherwise,
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| 64 | the call returns a non-negative descriptor that only permits
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| 65 | writing.
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| 66 | .SH ERRORS
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| 67 | .I Creat
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| 68 | will fail and the file will not be created or truncated
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| 69 | if one of the following occur:
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| 70 | .TP 15
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| 71 | [ENOTDIR]
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| 72 | A component of the path prefix is not a directory.
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| 73 | .TP 15
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| 74 | [ENAMETOOLONG]
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| 75 | The path name exceeds PATH_MAX characters.
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| 76 | .TP 15
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| 77 | [ENOENT]
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| 78 | The named file does not exist.
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| 79 | .TP 15
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| 80 | [ELOOP]
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| 81 | Too many symbolic links were encountered in translating the pathname.
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| 82 | (Minix-vmd)
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| 83 | .TP 15
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| 84 | [EACCES]
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| 85 | Search permission is denied for a component of the path prefix.
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| 86 | .TP 15
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| 87 | [EACCES]
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| 88 | The file does not exist and the directory
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| 89 | in which it is to be created is not writable.
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| 90 | .TP 15
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| 91 | [EACCES]
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| 92 | The file exists, but it is unwritable.
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| 93 | .TP 15
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| 94 | [EISDIR]
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| 95 | The file is a directory.
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| 96 | .TP 15
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| 97 | [EMFILE]
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| 98 | There are already too many files open.
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| 99 | .TP 15
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| 100 | [ENFILE]
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| 101 | The system file table is full.
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| 102 | .TP 15
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| 103 | [ENOSPC]
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| 104 | The directory in which the entry for the new file is being placed
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| 105 | cannot be extended because there is no space left on the file
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| 106 | system containing the directory.
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| 107 | .TP 15
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| 108 | [ENOSPC]
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| 109 | There are no free inodes on the file system on which the
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| 110 | file is being created.
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| 111 | .ig
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| 112 | .TP 15
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| 113 | [EDQUOT]
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| 114 | The directory in which the entry for the new file
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| 115 | is being placed cannot be extended because the
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| 116 | user's quota of disk blocks on the file system
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| 117 | containing the directory has been exhausted.
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| 118 | .TP 15
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| 119 | [EDQUOT]
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| 120 | The user's quota of inodes on the file system on
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| 121 | which the file is being created has been exhausted.
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| 122 | ..
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| 123 | .TP 15
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| 124 | [EROFS]
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| 125 | The named file resides on a read-only file system.
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| 126 | .TP 15
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| 127 | [ENXIO]
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| 128 | The file is a character special or block special file, and
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| 129 | the associated device does not exist.
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| 130 | .TP 15
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| 131 | [EIO]
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| 132 | An I/O error occurred while making the directory entry or allocating the inode.
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| 133 | .TP 15
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| 134 | [EFAULT]
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| 135 | .I Name
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| 136 | points outside the process's allocated address space.
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| 137 | .SH "SEE ALSO"
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| 138 | .BR open (2),
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| 139 | .BR write (2),
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| 140 | .BR close (2),
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| 141 | .BR chmod (2),
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| 142 | .BR umask (2).
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