flopen man page on FreeBSD

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FLOPEN(3)		 BSD Library Functions Manual		     FLOPEN(3)

     flopen — Reliably open and lock a file

     System Utilities Library (libutil, -lutil)

     #include <sys/fcntl.h>
     #include <libutil.h>

     flopen(const char *path, int flags);

     flopen(const char *path, int flags, mode_t mode);

     The flopen() function opens or creates a file and acquires an exclusive
     lock on it.  It is essentially equivalent with calling open() with the
     same parameters followed by flock() with an operation argument of
     LOCK_EX, except that flopen() will attempt to detect and handle races
     that may occur between opening / creating the file and locking it.	 Thus,
     it is well suited for opening lock files, PID files, spool files, mail‐
     boxes and other kinds of files which are used for synchronization between

     If flags includes O_NONBLOCK and the file is already locked, flopen()
     will fail and set errno to EWOULDBLOCK.

     As with open(), the additional mode argument is required if flags
     includes O_CREAT.

     If successful, flopen() returns a valid file descriptor.  Otherwise, it
     returns -1, and sets errno as described in flock(2) and open(2).

     errno(2), flock(2), open(2)

     The flopen function and this manual page were written by Dag-Erling
     Smørgrav ⟨des@FreeBSD.org⟩.

BSD				 June 6, 2009				   BSD

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