.ds lang COBOL
.ds gcobol GCC\ \*[lang]\ Front-end
.Dd \& September 2026
.Dt CBL_GET_PROGRAM_INFO 3\& "\&GNU Compatibility Library"
.Os Linux
.Sh NAME
.Nm CBL_GET_PROGRAM_INFO
.Nd Get metadata from a given program.
.Sh LIBRARY
libgcobol_compat_gnu
.
.Sh SYNOPSIS
.Ic COPY CBL_GET_PROGRAM_INFO
.Pp
.Ic call Dq "CBL_GET_PROGRAM_INFO"
using
by value
.Ar fn
by reference
.Ar param-block
.Ar return-buf
.Ar return-buf-len
returning
.Ar status-code
.
.Sh DESCRIPTION
Parameters:
.Pp
.Bl -tag -compact -width fn
.It Ar fn
is the function number to execute, from 0 to 10.
The list of supported functions is shown below:

.Ar 0 :
Return the program name for the innermost program in the call stack above
.Nm
and assign
.Ar cblte-gpi-handle .

.Ar 2 :
Return the
.Ar caller
program name associated with a
.Ar cblte-gpi-handle
instance previously allocated by function 0.
.Ar cblte-gpi-handle
is updated to the caller function.

.Ar 3 :
close a
.Ar cblte-gpi-handle
instance previously allocated by function 0.

.It Ar param-block
an instance of type
.Ar cblt-prog-info-params ,
defined in the
.Ar cbltypes
copybook as:
.Bd -literal:
         01 cblt-prog-info-params typedef.
          03 cblte-gpi-size       pic x(4) comp-5.
          03 cblte-gpi-flags      pic x(4) comp-5.
          03 cblte-gpi-handle     usage pointer.
          03 cblte-gpi-prog-id    usage pointer.
          03 cblte-gpi-attrs      pic x(4) comp-5.

.Ar cblte-gpi-flags
can further modify the behaviour of the 11 functions inside
.Nm .
A list of the currently supported bits is shown below:

.Ar 0 :
assign
.Ar cblte-gpi-handle .
This bit is only relevant for function
.Ar 0 ,
and is ignored by all other functions.

.Ar 1 :
fill
.Ar return-buf
with the program name.
This bit is only relevant for functions
.Ar 0
and
.Ar 2 .

.Ar 2 :
if set, the program name stored into
.Ar return-buf
shall be null-terminated,
or space-terminated otherwise.

.It Ar return-buf
points to a buffer to be filled by
.Nm .

.It Ar return-buf-len
on entry,
.Ar return-buf-len
indicates the length of the
.Ar return-buf
buffer,
.Sy including
the terminator byte (nul or space).
On exit,
.Ar return-buf-len
is updated to the length of the program name,
.Sy excluding
the terminator byte.
However, if
.Ar return-buf-len
is too small,
.Ar return-buf
is left untouched and
.Ar return-buf-len
is updated to the required buffer length,
.Sy including
the terminator byte.

.Sh RETURN STATUS
.Nm
returns
.Sy "PIC X(2) COMP-5" .
The return status is 0 on success, else nonzero.
The following return values are defined:

.Ar 500 :
(function 2 only) no parent available from the call stack.

.Ar 1001 :
invalid
.Ar cblte-gpi-handle .

.Ar 1009 :
invalid parameter.

.Ar 1011 :
invalid or undefined program name.
Additionally,
.Ar libgcobol_compat_gnu
uses this return value when no call stack was found for the given program.

.Ar 1013 :
.Ar return-buf-len
is too small to write the function basename to
.Ar return-buf .
The required buffer length is therefore written to
.Ar return-buf-len .

.
.Sh SEE ALSO
.Xr CBL_CLOSE_FILE
.Xr CBL_CREATE_FILE
.Xr CBL_DELETE_FILE
.Xr CBL_OPEN_FILE
.Xr CBL_READ_FILE
.Xr CBL_WRITE_FILE
.Xr CBL_CHECK_FILE_EXIST
.
.Sh COPYRIGHT
.Bd -unfilled -indent
Copyright (c) 2021-2026 Symas Corporation

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of the Symas Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.Ed