Shared Library Management Routines

Initializers for Shared Libraries

C Source for _INITIALIZER (file init.c)

#include <dl.h> /*

*Global initializer used by shared libraries that have

*registered it:

*/

void _INITIALIZER(shl_t hand, int loading)

{

void (*load_unload)();

if (loading)

shl_findsym(&hand, “load”, TYPE_PROCEDURE, (void *) &load_unload);

else

shl_findsym(&hand, “unload”, TYPE_PROCEDURE, (void *) &load_unload(;

(*load_unload( ();

/* call the function */

}

 

The following two source files show shared libraries that have registered

_INITIALIZER.

C Source for libunits.sl

#include <stdio.h> #include <dl.h>

void load()/* called after libunits.sl loaded */

{

printf(“libunits.sl loaded\n”);

}

 

void unload()

/* called after libunits.sl unloaded

*/

 

{

 

printf(“libunits.sl unloaded\n”);

}

 

extern void _INITIALIZER();

 

float in_to_cm(float in)

/* convert inches to centimeters */

{

 

return (in * 2.54);

 

}

 

float gal_to_l(float gal)

/* convert gallons to litres */

{

 

return (gal * 3.79);

 

}

 

float oz_to_g(float oz)

/* convert ounces to grams */

{

 

return (oz * 28.35);

 

}

 

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Chapter 6

Page 208
Image 208
Kenwood HP 9000 manual Source for libunits.sl, 208

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