Tuesday, September 28, 2010

How to call a function before main and after main

1. Using GCC compiler on Linux/Solaris

/*main.c :this program tells how we can call a function before main() call and after main() call*/


void my_ctor (void) __attribute__ ((constructor));
void my_dtor (void) __attribute__ ((destructor));

my_ctor (void)
printf ("hello before main()\n");

my_dtor (void)
printf ("bye after main()\n");

main (void)
printf ("hello\n");
return 0;

$gcc main.c
hello before main()
bye after main()

2. Using CC compiler on Solaris[Using Pragma]

Using pragma

#pragma init (foo)

void foo()
printf("\nInside foo");

#pragma fini (bar)

void bar()
printf("\nInside bar");

printf("\nInside main");
return 0;

$cc main.c
Inside foo
Inside main
Inside bar


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