glGetProgramiv

GL_APICALL void GL_APIENTRY glGetProgramiv(
     GLuint program,
     GLenum pname,
     GLint * params
);

	Name	Description
in	program	Program object
in	pname	Name of the parameter to get
out	params	Region storing the obtained parameters

No values are returned.

Gets program object parameters.

Set program to the program object.

Set pname to one of the following values.

GL_DELETE_STATUS	Gets `GL_TRUE` if the program object is waiting to be deleted and `GL_FALSE` otherwise. A program object in use by `glUseProgram` begins "waiting to be deleted" when `glDeleteProgram` is called on it.
GL_LINK_STATUS	Gets `GL_TRUE` if the program object has been successfully linked by `glLinkProgram` and `GL_FALSE` otherwise.
GL_INFO_LOG_LENGTH	Always gets a value of 0.
GL_ATTACHED_SHADERS	Gets the number of shader objects attached to the program.
GL_ACTIVE_ATTRIBUTES	Gets the number of active vertex attributes in the program.
GL_ACTIVE_ATTRIBUTE_MAX_LENGTH	Gets the number of characters in the name of the longest-named active vertex attribute in the program. A NULL terminator is also included in the character count.
GL_ACTIVE_UNIFORMS	Gets the number of active uniforms in the program.
GL_ACTIVE_UNIFORM_MAX_LENGTH	Gets the number of characters in the name of the longest-named active uniform in the program. A NULL terminator is also included in the character count.

This function generates the following errors.

GL_INVALID_ENUM	The pname argument was set to an invalid value.
GL_INVALID_VALUE	The program argument was set to an invalid value.

glGetProgramiv Function