Hi.
it does work. Try i.e.
~$ LD_SHOW_AUXV=1 /bin/true
AT_PHDR: 0x400040
AT_PHENT: 56
AT_PHNUM: 9
AT_PAGESZ: 4096
AT_FLAGS: 0x0
AT_ENTRY: 0x401274
AT_BASE: 0x800604000
AT_EXECPATH: /bin/true
AT_OSRELDATE: 900044
AT_CANARY: 0x7fffffffef96
AT_CANARYLEN: 64
AT_NCPUS: 1
AT_PAGESIZES: 0x7fffffffef7e
AT_PAGESIZESLEN: 24
AT_STACKPROT: 0x7
The AT_* constant are standardized only partially,
FreeBSD kernel knows these:
/* Values for a_type. */
#define AT_NULL 0 /* Terminates the vector. */
#define AT_IGNORE 1 /* Ignored entry. */
#define AT_EXECFD 2 /* File descriptor of program to load. */
#define AT_PHDR 3 /* Program header of program already loaded. */
#define AT_PHENT 4 /* Size of each program header entry. */
#define AT_PHNUM 5 /* Number of program header entries. */
#define AT_PAGESZ 6 /* Page size in bytes. */
#define AT_BASE 7 /* Interpreter's base address. */
#define AT_FLAGS 8 /* Flags (unused for i386). */
#define AT_ENTRY 9 /* Where interpreter should transfer control. */
#define AT_NOTELF 10 /* Program is not ELF ?? */
#define AT_UID 11 /* Real uid. */
#define AT_EUID 12 /* Effective uid. */
#define AT_GID 13 /* Real gid. */
#define AT_EGID 14 /* Effective gid. */
#define AT_EXECPATH 15 /* Path to the executable. */
#define AT_CANARY 16 /* Canary for SSP. */
#define AT_CANARYLEN 17 /* Length of the canary. */
#define AT_OSRELDATE 18 /* OSRELDATE. */
#define AT_NCPUS 19 /* Number of CPUs. */
#define AT_PAGESIZES 20 /* Pagesizes. */
#define AT_PAGESIZESLEN 21 /* Number of pagesizes. */
#define AT_TIMEKEEP 22 /* Pointer to timehands. */
#define AT_STACKPROT 23 /* Initial stack protection. */
#define AT_COUNT 24 /* Count of defined aux entry types. */
The number 23 is AT_STACKPROT, and value 7 is correct one.
The {e,}{u,g}id values are not passed from kernel (see above)
and therefore "On success, getauxval() returns the value corresponding to
type. If type is not found, 0 is returned."
Unfortunately, glibc so far does not allow
to override AT_* constant lists by a sysdeps bits.
What is your use case for getauxval() ?
Petr
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