man sc_establish_context (Fonctions bibliothèques) - Establish an OpenSC 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, andslot_count has the number of slots supported by this device.

RETURN VALUE

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