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/*
* Copyright 2013-2015, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <link.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "utils.h"
static char auxv[4096];
void *get_auxv_entry(int type)
{
ElfW(auxv_t) *p;
void *result;
ssize_t num;
int fd;
fd = open("/proc/self/auxv", O_RDONLY);
if (fd == -1) {
perror("open");
return NULL;
}
result = NULL;
num = read(fd, auxv, sizeof(auxv));
if (num < 0) {
perror("read");
goto out;
}
if (num > sizeof(auxv)) {
printf("Overflowed auxv buffer\n");
goto out;
}
p = (ElfW(auxv_t) *)auxv;
while (p->a_type != AT_NULL) {
if (p->a_type == type) {
result = (void *)p->a_un.a_val;
break;
}
p++;
}
out:
close(fd);
return result;
}
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