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compiler-rt: support ReExec() on FreeBSD

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Based on getMainExecutable() in llvm/lib/Support/Unix/Path.inc.
This will need a little more work for an upstream change as it must
support older FreeBSD releases that lack elf_aux_info() / AT_EXEC_PATH.

No objection:	dim
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33934
This commit is contained in:
Ed Maste 2022-01-19 13:08:18 -05:00
parent 867b4decb4
commit 96fe7c8ab0
1 changed files with 10 additions and 1 deletions
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11
contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
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@ -46,7 +46,9 @@
#if SANITIZER_FREEBSD
#include <pthread_np.h>
#include <stdlib.h>
#include <osreldate.h>
#include <sys/auxv.h>
#include <sys/sysctl.h>
#define pthread_getattr_np pthread_attr_get_np
// The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
@ -865,7 +867,14 @@ u64 MonotonicNanoTime() {
void ReExec() {
const char *pathname = "/proc/self/exe";
#if SANITIZER_NETBSD
#if SANITIZER_FREEBSD
char exe_path[PATH_MAX];
if (elf_aux_info(AT_EXECPATH, exe_path, sizeof(exe_path)) == 0) {
char link_path[PATH_MAX];
if (realpath(exe_path, link_path))
pathname = link_path;
}
#elif SANITIZER_NETBSD
static const int name[] = {
CTL_KERN,
KERN_PROC_ARGS,