creat man page on UNIXv7

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CREAT(2)							      CREAT(2)

NAME
       creat  -	 create a new file

SYNOPSIS
       creat(name, mode)
       char *name;

DESCRIPTION
       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.

       The  mode  given is arbitrary; it need not allow writing.  This feature
       is used by programs which deal with temporary  files  of	 fixed	names.
       The  creation is done with a mode that forbids writing.	Then if a sec‐
       ond instance of the program attempts a creat, an error is returned  and
       the program knows that the name is unusable for the moment.

SEE ALSO
       write(2), close(2), chmod(2), umask (2)

DIAGNOSTICS
       The  value -1 is returned if: a needed directory is not searchable; the
       file does not exist and the directory in which it is to be  created  is
       not  writable;  the  file  does	exist and is unwritable; the file is a
       directory; there are already too many files open.

ASSEMBLER
       (creat = 8.)
       sys creat; name; mode
       (file descriptor in r0)

								      CREAT(2)
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