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llvm: use AT_EXECPATH from ELF auxiliary vectors for getExecutablePath

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/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
This commit is contained in:
Ed Maste 2019-11-13 21:02:18 +00:00
parent f54d951986
commit 6717127ba3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354692
1 changed files with 27 additions and 5 deletions
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32
contrib/llvm/lib/Support/Unix/Path.inc
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@ -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 *MainAddr) {
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) {