open_excl man page on Alpinelinux

open_excl man page on Alpinelinux

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open_excl(3)							  open_excl(3)

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 han‐
       dle.  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)

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