add wrapper for __open_2 function call

ChangeLog

@@ -9,6 +9,8 @@ Darshan-3.1.7
   were not properly up-converted.  Reported by Teng Wang.
 * bug fix to MiB reported in I/O performance estimate of
   darshan-job-summary.pl when both posix and stdio access is present
+* added wrapper for __open_2(), bug reported by Cormac Garvey in which open
+  calls are not intercepted with some versions of glibc/gcc
 
 Darshan-3.1.6
 =============

darshan-runtime/lib/darshan-posix.c

@@ -40,6 +40,7 @@ typedef int64_t off64_t;
 
 DARSHAN_FORWARD_DECL(open, int, (const char *path, int flags, ...));
 DARSHAN_FORWARD_DECL(open64, int, (const char *path, int flags, ...));
+DARSHAN_FORWARD_DECL(__open_2, int, (const char *path, int oflag));
 DARSHAN_FORWARD_DECL(creat, int, (const char* path, mode_t mode));
 DARSHAN_FORWARD_DECL(creat64, int, (const char* path, mode_t mode));
 DARSHAN_FORWARD_DECL(mkstemp, int, (char *template));
@@ -403,6 +404,24 @@ int DARSHAN_DECL(open)(const char *path, int flags, ...)
     return(ret);
 }
 
+int DARSHAN_DECL(__open_2)(const char *path, int oflag)
+{
+    int ret;
+    double tm1, tm2;
+
+    MAP_OR_FAIL(__open_2);
+
+    tm1 = darshan_core_wtime();
+    ret = __real___open_2(path, oflag);
+    tm2 = darshan_core_wtime();
+
+    POSIX_PRE_RECORD();
+    POSIX_RECORD_OPEN(ret, path, 0, tm1, tm2);
+    POSIX_POST_RECORD();
+
+    return(ret);
+}
+
 int DARSHAN_DECL(open64)(const char *path, int flags, ...)
 {
     int mode = 0;

darshan-runtime/share/ld-opts/darshan-posix-ld-opts

 --wrap=open
 --wrap=open64
+--wrap=__open_2
 --wrap=creat
 --wrap=creat64
 --wrap=mkstemp