I use a third library OpenCTM to compress data in my CPlusPlus project.
After cmake and build, I got an executable file and copied it to the other place. Unfortunately, I always get the error code 127 from my web application. I didn’t figure it out because it’s successful to run the program in the shell environment.
The core logic in calling function is like the following code snippet.
function HandleFile( $filePath, $old_suffix, $new_suffix )
{
$cmdStr = __DIR__ . '/3DFilesConverter' . ' ' . $filePath
$output = "";
$ret_code = 0;
exec( $cmdStr, $output, $ret_code );
if( 0 != $ret_code )
{
echo "[error] ret_code: " . $ret_code . "\n";
echo $cmdStr . "\n";
print_r( $output );
exit( -1 );
}
return $output;
}
we can use the shell tool sed to read a few lines of a file.
sed -n 2,10p upload_file.php
I’m sure PHP can find the executable file 3DFilesConverter. So the error code 127 means the shared library file can’t be found?
I wrote a small PHP script file and run it by user apache.
sudo -u apache php test.php
The same error showed and more details were there, can't load shared library ....
So I have to tell PHP where to find the library file.
Plan A
Mark where to find the library in the executable file.
Add these statements in the CMakeLists.txt
set( OPENCTM_LIB_DIR "../OpenCTM-1.0.3/lib" )
...
SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
#SET(CMAKE_INSTALL_RPATH "\${ORIGIN}/lib") #the library path, ORIGIN means the path of exe
SET(CMAKE_INSTALL_RPATH ${OPENCTM_LIB_DIR} )
Run cmake and build the project again, get a new executable file.
Plan B
Change the variable LIBDIR in Makefile.linux in the folder OpenCTM.
#LIBDIR = /usr/lib/
LIBDIR = /usr/local/lib64/
Install the library again.
make -f Makefile.linux install
After that, you can run your web application successfully.
