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author | Florian Weimer <fweimer@redhat.com> | 2020-10-27 10:42:10 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2020-10-27 16:34:37 +0100 |
commit | 562ef5e69eb38230810bd25a4335224a31bfe31b (patch) | |
tree | f89ee605da223922e9d2920704af109bbf495772 /misc/getauxval.c | |
parent | 0ce51bef34e1edde9f60ccd6d9d70c56020d9d21 (diff) | |
download | glibc-562ef5e69eb38230810bd25a4335224a31bfe31b.zip glibc-562ef5e69eb38230810bd25a4335224a31bfe31b.tar.gz glibc-562ef5e69eb38230810bd25a4335224a31bfe31b.tar.bz2 |
misc: Add internal __getauxval2 function
The explicit error return value (without in-band signaling) avoids
complicated steps to detect errors based on whether errno has been
updated.
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'misc/getauxval.c')
-rw-r--r-- | misc/getauxval.c | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/misc/getauxval.c b/misc/getauxval.c index d7f9f95..e96d4df 100644 --- a/misc/getauxval.c +++ b/misc/getauxval.c @@ -18,26 +18,47 @@ #include <sys/auxv.h> #include <errno.h> #include <ldsodefs.h> +#include <stdbool.h> - -unsigned long int -__getauxval (unsigned long int type) +bool +__getauxval2 (unsigned long int type, unsigned long int *result) { #ifdef HAVE_AUX_VECTOR ElfW(auxv_t) *p; #endif if (type == AT_HWCAP) - return GLRO(dl_hwcap); + { + *result = GLRO(dl_hwcap); + return true; + } else if (type == AT_HWCAP2) - return GLRO(dl_hwcap2); + { + *result = GLRO(dl_hwcap2); + return true; + } #ifdef HAVE_AUX_VECTOR for (p = GLRO(dl_auxv); p->a_type != AT_NULL; p++) if (p->a_type == type) - return p->a_un.a_val; + { + *result = p->a_un.a_val; + return true; + } #endif + return false; +} +libc_hidden_def (__getauxval2) + +unsigned long int +__getauxval (unsigned long int type) +{ + unsigned long int result; + + if (__getauxval2 (type, &result)) + return result; + __set_errno (ENOENT); return 0; } |