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.Dd May 11, 2016
.Dt PFDINFO_ITER 3PROC
.Os
.Sh NAME
.Nm Pfdinfo_iter
.Nd iterate open files in a process
.Sh SYNOPSIS
.Lb libproc
.In libproc.h
.Ft int
.Fo Pfdinfo_iter
.Fa "struct ps_prochandle *P"
.Fa "proc_fdinfo_f *func"
.Fa "void *data"
.Fc
.Sh DESCRIPTION
The
.Fn Pfdinfo_iter
function iterates over the open files in the process represented by
.Fa P .
.Pp
For each open file, the callback function
.Fa func
will be invoked and it will be passed the
.Fa data
argument as well as a pointer to a
.Sy prfdinfo_t
structure defined in
.Xr libproc 3LIB .
For the full signature of the
.Vt proc_fdinfo_f
see
.Xr libproc 3LIB .
.Pp
The return value of
.Fa func
controls whether or not iteration continues. If
.Fa func
returns
.Sy 0 ,
then iteration will continue. However, if
.Fa func
instead returns a non-zero value, then iteration will halt and that
value will be used as the return value of the
.Fn Pfdinfo_iter
function. Because the
.Fn Pfdinfo_iter
function returns
.Sy -1
to an indicate its own errors, it is recommended that the callback
function does not return
.Sy -1
to indicate an error so that the caller may distinguish between the
failure of the callback function and the failure of the
.Fn Pfdinfo_iter
function.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Pfdinfo_iter
returns
.Sy 0 .
Otherwise, if there was an internal error then
.Sy -1
is returned. Otherwise, if the callback function
.Fa func
returns non-zero, then its return value will be returned instead.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB