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nolibc/stdlib: Implement getauxval(3) function

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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: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Ammar Faizi 2023-01-10 08:24:32 +01:00 committed by Paul E. McKenney
parent 241c4b4e02
commit c61a078015
1 changed files with 27 additions and 0 deletions
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27
tools/include/nolibc/stdlib.h
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@ -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)
{