compiler-rt/test/sanitizer_common/TestCases/Posix/popen.cpp

   1 // RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s
   2 // CHECK: 1
   3 // CHECK-NEXT: 2
   4
   5 #include <assert.h>
   6 #include <stdio.h>
   7
   8 int main(void) {
   9   // use a tool that produces different output than input to verify
  10   // that everything worked correctly
  11   FILE *fp = popen("sort", "w");
  12   assert(fp);
  13
  14   // verify that fileno() returns a meaningful descriptor (needed
  15   // for the implementation of TSan)
  16   assert(fileno(fp) != -1);
  17
  18   assert(fputs("2\n", fp) >= 0);
  19   assert(fputs("1\n", fp) >= 0);
  20   assert(pclose(fp) == 0);
  21
  22   return 0;
  23 }