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The assumption that /proc/self/exe always exists is incorrect.

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For example, under a Linux chroot, /proc/ might not be mounted.
Therefor, we test if this file exist. If it is the case, use it (the current
behavior). Otherwise, we fall back to the detection used by *BSD.

The issue has been reported initially on the Debian bug tracker:
http://bugs.debian.org/674588



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sylvestre Ledru 2012-09-26 08:30:35 +00:00
parent 4fa2ddbb94
commit bec3ce0cb5
1 changed files with 13 additions and 4 deletions
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17
lib/Support/Unix/Path.inc
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@ -261,7 +261,8 @@ Path::GetCurrentDirectory() {
}
#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__)
defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
defined(__linux__) || defined(__CYGWIN__)
static int
test_dir(char buf[PATH_MAX], char ret[PATH_MAX],
const char *dir, const char *bin)
@ -337,9 +338,17 @@ Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
return Path(exe_path);
#elif defined(__linux__) || defined(__CYGWIN__)
char exe_path[MAXPATHLEN];
ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path));
if (len >= 0)
return Path(StringRef(exe_path, len));
StringRef aPath("/proc/self/exe");
if (sys::fs::exists(aPath)) {
// /proc is not always mounted under Linux (chroot for example).
ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
if (len >= 0)
return Path(StringRef(exe_path, len));
} else {
// Fall back to the classical detection.
if (getprogpath(exe_path, argv0) != NULL)
return Path(exe_path);
}
#elif defined(HAVE_DLFCN_H)
// Use dladdr to get executable path if available.
Dl_info DLInfo;