NAME

       open_excl - open a file for exclusive writing

SYNTAX

       #include <open.h>

       int open_excl(const char *filename);

DESCRIPTION

       open_excl  opens  the file filename for writing and returns the file handle.  The file may
       not exist before the call to open_excl.  The file will be created with mode 0600.

       If there was an error creating the file, open_excl returns -1 and sets errno accordingly.

       Since open_excl relies on the O_EXCL flag to open, it does not work reliably over NFS (the
       NFS  protocol  is  broken)  and  must  be emulated using a lock file (create a file with a
       unique file name and link(2) it to the lock file.  Then stat the lock file and see if  the
       link count is 2).

SEE ALSO

       open(2)

                                                                                     open_excl(3)