CREAT(II) 8/5/73 CREAT(II)





CREAT(II)                    8/5/73                     CREAT(II)







NAME

     creat  -  create a new file



SYNOPSIS

     (creat = 8.)

     sys creat; name; mode

     (file descriptor in r0)



     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.

     See chmod (II) 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 (in r0).



     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 second 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 (II), close (II), stat (II)



DIAGNOSTICS

     The error bit (c-bit) may be set 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.



     From C, a -1 return indicates an error.
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