[Sanitizer] Intercept getusershell

- If entries are properly copied (there were a bug in FreeBSD implementation in earlier version), or list properly reset.

Reviewers: vitalybuka, krytarowski

Reviewed By: krytarowski

Differential Revision: https://reviews.llvm.org/D56562

llvm-svn: 350919

1 files changed, 21 insertions, 0 deletions

diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/getusershell.cc b/compiler-rt/test/sanitizer_common/TestCases/Posix/getusershell.cc
new file mode 100644
index 00000000000..6ad1c5bd17a
--- /dev/null
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/getusershell.cc
@@ -0,0 +1,21 @@
+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void) {
+  printf("getusershell\n");
+
+  setusershell();
+  char *fentry = getusershell();
+
+  printf("First entry: '%s'\n", fentry);
+
+  endusershell();
+
+  return 0;
+  // CHECK: getusershell
+  // CHECK: First entry: '{{.*}}'
+}