NAME
creat - create a new file
SYNOPSIS
#include <sys/types.h>
#include <fcntl.h>
int creat(const char *name, mode_t mode)
DESCRIPTION
This interface is made obsolete by open(2), it is equivalent
to
open(name, O_WRONLY | O_CREAT | O_TRUNC, mode)
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 the advisory locking of
the fcntl(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.
[ENAMETOOLONG] The path name exceeds PATH_MAX characters.
[ENOENT] The named file does not exist.
[ELOOP] Too many symbolic links were encountered in
translating the pathname. (Minix-vmd)
[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 unwritable.
[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.
[EROFS] The named file resides on a read-only file
system.
[ENXIO] The file is a character special or block spe-
cial file, and the associated device does not
exist.
[EIO] An I/O error occurred while making the direc-
tory entry or allocating the inode.
[EFAULT] Name points outside the process's allocated
address space.
SEE ALSO
open(2), write(2), close(2), chmod(2), umask(2).