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CREAT(2)	    UNIX Programmer's Manual		 CREAT(2)



[1mNAME
     [0mcreat - create a new file

[1mSYNOPSIS
     creat(name, mode)
     char *name;

DESCRIPTION
     This interface is made obsolete by open(2).

     [0m_C_r_e_a_t creates a new file or prepares to rewrite an existing
     file called _n_a_m_e, given as the address of a null-terminated
     string.  If the file did not exist, it is given mode _m_o_d_e,
     as modified by the process's mode mask (see _u_m_a_s_k(2)).  Also
     see _c_h_m_o_d(2) for the construction of the _m_o_d_e 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.

[1mNOTES
     [0mThe _m_o_d_e 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 _f_l_o_c_k(2) facility.

[1mRETURN VALUE
     [0mThe value -1 is returned if an error occurs.  Otherwise, the
     call returns a non-negative descriptor that only permits
     writing.

[1mERRORS
     [0m_C_r_e_a_t will fail and the file will not be created or trun-
     cated if one of the following cases applies:

     [ENOTDIR]	    A component of the path prefix is not a
		    directory.

     [ENAMETOOLONG] A component of a pathname exceeded 255 char-
		    acters, 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.




Printed 28/11/91    Revision 1.3 of 22/10/90			1






CREAT(2)	    UNIX Programmer's Manual		 CREAT(2)



     [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.

     [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 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 spe-
		    cial 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 direc-
		    tory entry or allocating the inode.

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

     [EOPNOTSUPP]   The file was a socket (not currently imple-
		    mented).

[1mSEE ALSO
     [0mopen(2), write(2), close(2), chmod(2), umask(2)





Printed 28/11/91    Revision 1.3 of 22/10/90			2



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