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sc_establish_context

NAME

sc_establish_context - Establish an OpenSC context

SYNOPSIS

#include <opensc.h>



int sc_establish_context(sc_context_t **ctx,

                         const char *appname);

                

DESCRIPTION

This function establishes an OpenSC context. This context is required in all subsequent calls to OpenSC functions.

ctx is a pointer to a pointer that will receive the allocated context.

appname is a string that identifies the application. This string will be used to apply application-specific settings from the opensc.conf configuration file. If NULL is passed, only the settings specified in the default section apply; otherwise, settings from the section identified by appname will be applied as well.

The sc_context structure contains the following members:

#define SC_MAX_READERS                  16



typedef struct sc_context {

        struct sc_reader *reader[SC_MAX_READERS];

        int reader_count;

} sc_context_t;

                        

The reader_count field contains the number of readers found. Information on the individual card readers is stored in sc_reader objects, defined as follows:

typedef struct sc_reader {

        char *name;

        int slot_count;

}; sc_reader_t;

                                

In this structure, name contains a printable name of the reader, and slot_count has the number of slots supported by this device.

RETURN VALUE

Returns 0 if successful, or a negative value in case of error.