kc3-lang/libbsd/man/flopen.3

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• man/flopen.3

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  .\" Copyright (c) 2007 Dag-Erling Coïdan Smørgrav
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  .\" $FreeBSD$
  .\"
  .Dd June 6, 2009
  .Dt FLOPEN 3
  .Os
  .Sh NAME
  .Nm flopen
  .Nd reliably open and lock a file
  .Sh LIBRARY
  .ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
  .Lb libbsd
  .Sh SYNOPSIS
  .In sys/fcntl.h
  .In bsd/libutil.h
  .Ft int
  .Fn flopen "const char *path" "int flags"
  .Ft int
  .Fn flopen "const char *path" "int flags" "mode_t mode"
  .Sh DESCRIPTION
  The
  .Fn flopen
  function opens or creates a file and acquires an exclusive lock on it.
  It is essentially equivalent with calling
  .Fn open
  with the same parameters followed by
  .Fn flock
  with an
  .Va operation
  argument of
  .Dv LOCK_EX ,
  except that
  .Fn 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, mailboxes and other kinds of files which are used for
  synchronization between processes.
  .Pp
  If
  .Va flags
  includes
  .Dv O_NONBLOCK
  and the file is already locked,
  .Fn flopen
  will fail and set
  .Va errno
  to
  .Dv EWOULDBLOCK .
  .Pp
  As with
  .Fn open ,
  the additional
  .Va mode
  argument is required if
  .Va flags
  includes
  .Dv O_CREAT .
  .Sh RETURN VALUES
  If successful,
  .Fn flopen
  returns a valid file descriptor.
  Otherwise, it returns \-1, and sets
  .Va errno
  as described in
  .Xr flock 2
  and
  .Xr open 2 .
  .Sh SEE ALSO
  .Xr errno 2 ,
  .Xr flock 2 ,
  .Xr open 2
  .Sh AUTHORS
  .An -nosplit
  The
  .Nm
  function and this manual page were written by
  .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
  

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