OPEN_EXCL(3) - man page online | library functions

Open a file for exclusive writing.

open_excl(3)                         Library Functions Manual                        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 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)
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open_excl(3) referred by
refer to link(2) | open(2)