Commit c61a0780 authored by Ammar Faizi's avatar Ammar Faizi Committed by Paul E. McKenney
Browse files

nolibc/stdlib: Implement `getauxval(3)` function 



Previous commits save the address of the auxiliary vector into a global
variable @_auxv. This commit creates a new function 'getauxval()' as a
helper function to get the auxv value based on the given key.

The behavior of this function is identic with the function documented
in 'man 3 getauxval'. This function is also needed to implement
'getpagesize()' function that we will wire up in the next patches.

Signed-off-by: default avatarAmmar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 241c4b4e

tools/include/nolibc/stdlib.h

+27 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include "types.h"

#include "sys.h"

#include "string.h"

#include <linux/auxvec.h>



struct nolibc_heap {

	size_t	len;
@@ -108,6 +109,32 @@ char *getenv(const char *name) 
	return _getenv(name, environ);

}



static __attribute__((unused))

unsigned long getauxval(unsigned long type)

{

	const unsigned long *auxv = _auxv;

	unsigned long ret;



	if (!auxv)

		return 0;



	while (1) {

		if (!auxv[0] && !auxv[1]) {

			ret = 0;

			break;

		}



		if (auxv[0] == type) {

			ret = auxv[1];

			break;

		}



		auxv += 2;

	}



	return ret;

}



static __attribute__((unused))

void *malloc(size_t len)

{