svn commit: r354692 - head/contrib/llvm/lib/Support/Unix
Ed Maste
emaste at FreeBSD.org
Wed Nov 13 21:02:19 UTC 2019
Author: emaste
Date: Wed Nov 13 21:02:18 2019
New Revision: 354692
URL: https://svnweb.freebsd.org/changeset/base/354692
Log:
llvm: use AT_EXECPATH from ELF auxiliary vectors for getExecutablePath
/proc/curproc/file and the KERN_PROC_PATHNAME sysctl may not return the
desired path if there are multiple hardlinks to the file.
PR: 241932
Tested by: ler
Sponsored by: The FreeBSD Foundation
Modified:
head/contrib/llvm/lib/Support/Unix/Path.inc
Modified: head/contrib/llvm/lib/Support/Unix/Path.inc
==============================================================================
--- head/contrib/llvm/lib/Support/Unix/Path.inc Wed Nov 13 20:32:23 2019 (r354691)
+++ head/contrib/llvm/lib/Support/Unix/Path.inc Wed Nov 13 21:02:18 2019 (r354692)
@@ -38,6 +38,9 @@
#include <mach-o/dyld.h>
#include <sys/attr.h>
#include <copyfile.h>
+#elif defined(__FreeBSD__)
+#include <machine/elf.h>
+extern char **environ;
#elif defined(__DragonFly__)
#include <sys/mount.h>
#endif
@@ -183,13 +186,32 @@ std::string getMainExecutable(const char *argv0, void
if (realpath(exe_path, link_path))
return link_path;
}
-#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
- defined(__minix) || defined(__DragonFly__) || \
- defined(__FreeBSD_kernel__) || defined(_AIX)
+#elif defined(__FreeBSD__)
+ // On FreeBSD if the exec path specified in ELF auxiliary vectors is
+ // preferred, if available. /proc/curproc/file and the KERN_PROC_PATHNAME
+ // sysctl may not return the desired path if there are multiple hardlinks
+ // to the file.
+ char exe_path[PATH_MAX];
+ char **p = ::environ;
+ while (*p++ != 0)
+ ;
+ // ELF auxiliary vectors immediately follow the process's environment.
+ for (;;) {
+ switch (*(uintptr_t *)p++) {
+ case AT_EXECPATH:
+ return *p;
+ case AT_NULL:
+ break;
+ }
+ p++;
+ }
+ // Fall back to argv[0] if auxiliary vectors are not available.
+ if (getprogpath(exe_path, argv0) != NULL)
+ return exe_path;
+#elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__minix) || \
+ defined(__DragonFly__) || defined(__FreeBSD_kernel__) || defined(_AIX)
StringRef curproc("/proc/curproc/file");
char exe_path[PATH_MAX];
- // /proc is not mounted by default under FreeBSD, but gives more accurate
- // information than argv[0] when it is.
if (sys::fs::exists(curproc)) {
ssize_t len = readlink(curproc.str().c_str(), exe_path, sizeof(exe_path));
if (len > 0) {
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