debian man page for open_trunc

open_trunc(3)						     Library Functions Manual						     open_trunc(3)

NAME
       open_trunc - open a file for writing

SYNTAX
       #include <open.h>

       int open_trunc(const char *filename);

DESCRIPTION
       open_trunc  opens the file filename for write-only use and returns the file handle.  If the file exists, it will be truncated to zero bytes
       length.	If it does not exist, it will be created with mode 0644.  If there was an error opening or creating the file,  open_trunc  returns
       -1 and sets errno accordingly.

SEE ALSO
       open(2)

																     open_trunc(3)