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.Dd May 11, 2016 .Dt LCTLFD 3PROC .Os .Sh NAME .Nm Lctlfd .Nd obtain the thread control file descriptor .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo Lctlfd .Fa "struct ps_lwphandle *L" .Fc .Sh DESCRIPTION The .Fn Lctlfd function returns a file descriptor to the underlying /proc file system .Sy ctl file for the thread identified by the handle .Fa L . This may be used for injecting control operations manually; however, many interfaces for using it are provided by .Xr libproc 3LIB itself.

p The file descriptor is invalidated when the thread handle is released through .Xr Lfree 3PROC . The caller .Em must not call .Xr close 2 on the returned file descriptor. .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr libproc 3LIB , .Xr Lfree 3PROC , .Xr Lgrab 3PROC , .Xr proc 4