143 lines
3.2 KiB
Groff
143 lines
3.2 KiB
Groff
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.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)creat.2 6.6 (Berkeley) 5/22/86
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.\"
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.TH CREAT 2 "May 22, 1986"
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.UC 4
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.SH NAME
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creat \- create a new file
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.SH SYNOPSIS
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.nf
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.ft B
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#include <sys/types.h>
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#include <fcntl.h>
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int creat(const char *\fIname\fP, mode_t \fImode\fP)
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.ft R
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.fi
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.SH DESCRIPTION
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.ft B
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This interface is made obsolete by open(2), it is equivalent to
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.ft R
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.PP
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.RS
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open(\fIname\fP, O_WRONLY | O_CREAT | O_TRUNC, \fImode\fP)
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.RE
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.PP
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.B Creat
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creates a new file or prepares to rewrite an existing
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file called
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.IR name ,
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given as the address of a null-terminated string.
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If the file did not exist, it is given
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mode
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.IR mode ,
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as modified by the process's mode mask (see
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.BR umask (2)).
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Also see
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.BR chmod (2)
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for the
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construction of the
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.I mode
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argument.
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.PP
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If the file did exist, its mode and owner remain unchanged
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but it is truncated to 0 length.
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.PP
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The file is also opened for writing, and its file descriptor
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is returned.
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.SH NOTES
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The
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.I mode
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given is arbitrary; it need not allow
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writing.
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This feature has been used in the past by
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programs to construct a simple, exclusive locking
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mechanism. It is replaced by the O_EXCL open
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mode, or the advisory locking of the
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.BR fcntl (2)
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facility.
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.SH "RETURN VALUE
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The value \-1 is returned if an error occurs. Otherwise,
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the call returns a non-negative descriptor that only permits
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writing.
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.SH ERRORS
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.I Creat
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will fail and the file will not be created or truncated
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if one of the following occur:
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.TP 15
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[ENOTDIR]
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A component of the path prefix is not a directory.
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.TP 15
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[ENAMETOOLONG]
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The path name exceeds PATH_MAX characters.
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.TP 15
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[ENOENT]
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The named file does not exist.
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.TP 15
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[ELOOP]
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Too many symbolic links were encountered in translating the pathname.
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(Minix-vmd)
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.TP 15
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[EACCES]
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Search permission is denied for a component of the path prefix.
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.TP 15
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[EACCES]
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The file does not exist and the directory
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in which it is to be created is not writable.
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.TP 15
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[EACCES]
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The file exists, but it is unwritable.
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.TP 15
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[EISDIR]
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The file is a directory.
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.TP 15
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[EMFILE]
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There are already too many files open.
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.TP 15
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[ENFILE]
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The system file table is full.
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.TP 15
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[ENOSPC]
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The directory in which the entry for the new file is being placed
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cannot be extended because there is no space left on the file
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system containing the directory.
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.TP 15
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[ENOSPC]
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There are no free inodes on the file system on which the
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file is being created.
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.ig
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.TP 15
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[EDQUOT]
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The directory in which the entry for the new file
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is being placed cannot be extended because the
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user's quota of disk blocks on the file system
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containing the directory has been exhausted.
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.TP 15
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[EDQUOT]
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The user's quota of inodes on the file system on
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which the file is being created has been exhausted.
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..
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.TP 15
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[EROFS]
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The named file resides on a read-only file system.
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.TP 15
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[ENXIO]
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The file is a character special or block special file, and
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the associated device does not exist.
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.TP 15
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[EIO]
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An I/O error occurred while making the directory entry or allocating the inode.
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.TP 15
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[EFAULT]
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.I Name
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points outside the process's allocated address space.
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.SH "SEE ALSO"
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.BR open (2),
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.BR write (2),
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.BR close (2),
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.BR chmod (2),
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.BR umask (2).
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