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open_excl(3)		    Library Functions Manual		    open_excl(3)

NAME
     open_excl - open a file for exclusive writing

SYNTAX
     #include <libowfat/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 cre-
     ated with mode 0600.

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

     Since  open_excl  relies on the O_EXCL flag to open, it does not work reli-
     ably 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_append(3),    open_read(3),   open_rw(3),   open_trunc(3),
     open_write(3), openreadclose(3), readclose(3), readclose_append(3)

								    open_excl(3)

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<https://man.freebsd.org/cgi/man.cgi?query=libowfat_open_excl&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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