Fixed bug #21958 (workaround for unusual realpath() on AIX & Tru64).

TSRM/tsrm_virtual_cwd.h

@@ -41,6 +41,10 @@
 #include <unistd.h>
 #endif
 
+#if defined(__osf__) || defined(_AIX)
+#include <errno.h>
+#endif
+
 #ifdef TSRM_WIN32
 #include "readdir.h"
 #include <sys/utime.h>
@@ -167,6 +171,25 @@ CWD_API int virtual_access(const char *pathname, int mode TSRMLS_DC);
 #endif
 #endif
 
+/* On AIX & Tru64 when a file does not exist realpath() returns
+ * NULL, and sets errno to ENOENT. Unlike in other libc implementations
+ * the destination is not filled and remains undefined. Therefor, we
+ * must populate it manually using strcpy as done on systems with no
+ * realpath() function.
+ */
+#if defined(__osf__) || defined(_AIX)
+static char *php_realpath_hack(char *src, char *dest)
+{
+	char *ret;
+
+	if ((ret = realpath(src, dest)) == NULL && errno == ENOENT) {
+		return strcpy(dest, src);
+	} else {
+		return ret;
+	}
+}
+#endif
+
 #if HAVE_UTIME
 CWD_API int virtual_utime(const char *filename, struct utimbuf *buf TSRMLS_DC);
 #endif
@@ -248,7 +271,11 @@ typedef struct _virtual_cwd_globals {
 #endif
 
 #ifdef HAVE_REALPATH
+#if defined(__osf__) || defined(_AIX)
+#define VCWD_REALPATH(path, real_path) php_realpath_hack(path, real_path)
+#else
 #define VCWD_REALPATH(path, real_path) realpath(path, real_path)
+#endif
 #else
 #define VCWD_REALPATH(path, real_path) strcpy(real_path, path)
 #endif