Listed here are functions provided in the MathLink Developer's Kit.
MLINK: a MathLink link object (analogous to LinkObject in Mathematica)
These functions are declared in the file mathlink.h, which should be included in the source code for any MathLink-compatible program.
Unless you specify #defineMLPROTOTYPES0 before #include"mathlink.h" the functions will be included with standard C prototypes.
The following special types are defined in mathlink.h:
MLMARK: a mark in a MathLink stream
MLENV: MathLink library environment
The following constants are set up when a MathLink template file is processed:
MLINKstdlink: the standard link that connects a program built from MathLink templates to Mathematica
MLENVstdenv: the standard MathLink environment in a program built from MathLink templates
All functions described here are C language functions. They can be called from other languages with appropriate wrappers.
Those which return int yield a non-zero value if they succeed; otherwise they return 0 and have no effect.
The functions have the following general features:
In a program set up using MathLink templates, the link to Mathematica is called stdlink.
Functions which put data to a link do not deallocate memory used to store the data.
Functions which get data from a link may allocate memory to store the data.
Functions which get data from a link will not return until the necessary data becomes available. A yield function can be registered to be called during the wait.