BSD 2.11 - man page for creat (bsd section 2)

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CREAT(2)										 CREAT(2)

       creat - create a new file

       creat(name, mode)
       char *name;

       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 construc-
       tion of the mode argument.

       If the file did exist, its mode and owner remain  unchanged  but  it  is  truncated  to	0

       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 flock(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

       [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.

       [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

       [ENOSPC]       There are no free inodes on the file system on which the file is being cre-

       [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 con-
		      taining the directory 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 associated
		      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

       [EFAULT]       Name points outside the process's allocated address space.

       [EOPNOTSUPP]   The file was a socket (not currently implemented).

       open(2), write(2), close(2), chmod(2), umask(2)

4th Berkeley Distribution		   May 22, 1986 				 CREAT(2)
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