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#include <elf.h>
#include <link.h>
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
int
main (int argc, char **argv, char **envp)
{
ElfW(auxv_t) auxv;
ElfW(auxv_t) *auxv_p;
void *entry0 = NULL;
void *entry1 = NULL;
char *platform0 = NULL;
char *platform1 = NULL;
// First try the "traditional" way.
while (*envp++ != NULL)
; /* Skip, skip, skip... and after finding a NULL we have the auxv. */
for (auxv_p = (ElfW(auxv_t) *) envp;
auxv_p->a_type != AT_NULL;
auxv_p++)
{
if (auxv_p->a_type == AT_ENTRY)
entry0 = (void *) auxv_p->a_un.a_val;
if (auxv_p->a_type == AT_PLATFORM)
platform0 = strdup((char *) auxv_p->a_un.a_val);
}
// Now the /proc way as often used in libraries.
int fd = open("/proc/self/auxv", O_RDONLY);
if (fd == -1)
return -1;
while (read(fd, &auxv, sizeof(auxv)) == sizeof(auxv))
{
if (auxv.a_type == AT_ENTRY)
entry1 = (void *) auxv.a_un.a_val;
if (auxv.a_type == AT_PLATFORM)
platform1 = strdup((char *) auxv.a_un.a_val);
}
close(fd);
if (entry0 == entry1 && entry0 != NULL)
fprintf(stderr, "entries OK\n");
if (strcmp (platform0, platform1) == 0)
fprintf(stderr, "platform OK\n");
free (platform0);
free (platform1);
return 0;
}
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