ustfork: set errno to ENOSYS if symbol lookup fails

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/liblttng-ust-fork/ustfork.c b/liblttng-ust-fork/ustfork.c
index 2e4c8a8fb73c167acbf1d7ade1f01e4698daf7f0..cc6963b344419beaec236b24bc0831847e29103d 100644 (file)
--- a/liblttng-ust-fork/ustfork.c
+++ b/liblttng-ust-fork/ustfork.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2009  Pierre-Marc Fournier
- * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011-2012  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -38,6 +38,7 @@ pid_t fork(void)
                plibc_func = dlsym(RTLD_NEXT, "fork");
                if (plibc_func == NULL) {
                        fprintf(stderr, "libustfork: unable to find \"fork\" symbol\n");
+                       errno = ENOSYS;
                        return -1;
                }
        }
@@ -96,6 +97,7 @@ int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...)
                plibc_func = dlsym(RTLD_NEXT, "clone");
                if (plibc_func == NULL) {
                        fprintf(stderr, "libustfork: unable to find \"clone\" symbol.\n");
+                       errno = ENOSYS;
                        return -1;
                }
        }
@@ -132,6 +134,7 @@ pid_t rfork(int flags)
                plibc_func = dlsym(RTLD_NEXT, "rfork");
                if (plibc_func == NULL) {
                        fprintf(stderr, "libustfork: unable to find \"rfork\" symbol\n");
+                       errno = ENOSYS;
                        return -1;
                }
        }