creat - create a new file
int creat(const char *name, mode_t mode)
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
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.
The mode given is arbitrary; it need not allow writing. This feature has
been used in the past by programs to construct a simple, exclusive
locking mechanism. It is replaced by the O_EXCL open mode, or the
advisory locking of the fcntl(2) facility.
The value -1 is returned if an error occurs. Otherwise, the call returns
a non-negative descriptor that only permits writing.
Creat will fail and the file will not be created or truncated 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
[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 special file, and
the associated device does not exist.
[EIO] An I/O error occurred while making the directory entry or
allocating the inode.
[EFAULT] Name points outside the process's allocated address space.
open(2), write(2), close(2), chmod(2), umask(2).