CREAT(2-BSD) RISC/os Reference Manual CREAT(2-BSD)
NAME
creat - create a new file
SYNOPSIS
creat(name, mode)
char *name;
DESCRIPTION
This interface is made obsolete by open(2).
creat creates a new file or prepares to rewrite an existing
file called name, given as the address of a null-terminated
string. If the file did not exist, it is given mode mode,
as modified by the process's mode mask (see umask(2)). Also
see chmod(2) for the construction of the mode argument.
If the file did exist, its mode and owner remain unchanged
but it is truncated to 0 length.
The file is also opened for writing, and its file descriptor
is returned.
NOTES
The mode given is arbitrary; it need not allow writing.
This feature has been used in the past by programs to con-
struct a simple, exclusive locking mechanism. It is
replaced by the O_EXCL open mode, or flock(2) facility.
RETURN VALUE
The value -1 is returned if an error occurs. Otherwise, the
call returns a non-negative descriptor that only permits
writing.
ERRORS
creat will fail and the file will not be created or trun-
cated if one of the following occur:
[ENOTDIR] A component of the path prefix is
not a directory.
[EINVAL] The pathname contains a character
with the high-order bit set.
[ENAMETOOLONG] A component of a pathname exceeded
255 characters, or an entire path
name exceeded 1023 characters.
[ENOENT] The named file does not exist.
[ELOOP] Too many symbolic links were
encountered in translating the
pathname.
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[EACCES] Search permission is denied for a
component of the path prefix.
[EACCES] The file does not exist and the
directory in which it is to be
created is not writable.
[EACCES] The file exists, but it is unwrit-
able.
[EISDIR] The file is a directory.
[EMFILE] There are already too many files
open.
[ENFILE] The system file table is full.
[ENOSPC] The directory in which the entry
for the new file is being placed
cannot be extended because there is
no space left on the file system
containing the directory.
[ENOSPC] There are no free inodes on the
file system on which the file is
being created.
[EDQUOT] The directory in which the entry
for the new file is being placed
cannot be extended because the
user's quota of disk blocks on the
file system containing the direc-
tory has been exhausted.
[EDQUOT] The user's quota of inodes on the
file system on which the file is
being created has been exhausted.
[EROFS] The named file resides on a read-
only file system.
[ENXIO] The file is a character special or
block special file, and the associ-
ated device does not exist.
[ETXTBSY] The file is a pure procedure
(shared text) file that is being
executed.
[EIO] An I/O error occurred while making
the directory entry or allocating
the inode.
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[EFAULT] name points outside the process's
allocated address space.
[EOPNOTSUPP] The file was a socket (not
currently implemented).
SEE ALSO
open(2), write(2), close(2), chmod(2), umask(2)
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