https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293370
Bug ID: 293370
Summary: elf_aux_info(3): returns ENOENT for AT_HWCAP(2)
Product: Base System
Version: 15.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
Found via bug 292864. For usage example in port see CPP/Windows/SystemInfo.cpp
("Windows/SystemInfo.cpp" does not mean WIN32 for 7z), or the following
(reproducible in FreeBSD-15.0-RELEASE-amd64-ufs.raw VM image):
Linux getauxval(3):
RETURN VALUE
On success, getauxval() returns the value corresponding to type. If
type is not found, 0 is returned.
FreeBSD elf_aux_info(3):
RETURN VALUES
Returns zero on success, or an error number on failure.
example.c:
#include <sys/auxv.h>
#include <stdio.h>
#include <string.h>
#if defined(__FreeBSD__)
static unsigned long
MY_getauxval(int aux)
{
int err;
unsigned long val;
err = elf_aux_info(aux, &val, sizeof(val));
if (err) {
printf("elf_aux_info: %s\n", strerror(err));
val = 0; /* 7-zip wraps in MY_getauxval
then returns 0 on failure */
}
return (val);
}
#elif defined(__linux__)
#define MY_getauxval getauxval
#endif
int
main(void)
{
unsigned long h;
h = MY_getauxval(AT_HWCAP);
printf("hwcap:%lx\n", h);
h = MY_getauxval(AT_HWCAP2);
if (h != 0)
printf("hwcap2:%lx\n", h);
return (0);
}
@debian13:~$ cc example.c && ./a.out
hwcap:2
hwcap2:2
@freebsd15:~ $ cc example.c && ./a.out
elf_aux_info(): No such file or directory
hwcap:0
elf_aux_info(): No such file or directory
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