1  #include <stdio.h>
       2  #include <string.h>
       3  #include <unistd.h>
       4  
       5  static int
       6  do_test (void)
       7  {
       8    int fd = dup (fileno (stdout));
       9    if (fd <= 1)
      10      {
      11        puts ("dup failed");
      12        return 1;
      13      }
      14  
      15    FILE *f1 = fdopen (fd, "w");
      16    if (f1 == NULL)
      17      {
      18        printf ("fdopen failed: %m\n");
      19        return 1;
      20      }
      21  
      22    fclose (stdout);
      23  
      24    FILE *f2 = popen ("echo test1", "r");
      25    if (f2 == NULL)
      26      {
      27        fprintf (f1, "1st popen failed: %m\n");
      28        return 1;
      29      }
      30    FILE *f3 = popen ("echo test2", "r");
      31    if (f2 == NULL || f3 == NULL)
      32      {
      33        fprintf (f1, "2nd popen failed: %m\n");
      34        return 1;
      35      }
      36  
      37    char *line = NULL;
      38    size_t len = 0;
      39    int result = 0;
      40    if (getline (&line, &len, f2) != 6)
      41      {
      42        fputs ("could not read line from 1st popen\n", f1);
      43        result = 1;
      44      }
      45    else if (strcmp (line, "test1\n") != 0)
      46      {
      47        fprintf (f1, "read \"%s\"\n", line);
      48        result = 1;
      49      }
      50  
      51    if (getline (&line, &len, f2) != -1)
      52      {
      53        fputs ("second getline did not return -1\n", f1);
      54        result = 1;
      55      }
      56  
      57    if (getline (&line, &len, f3) != 6)
      58      {
      59        fputs ("could not read line from 2nd popen\n", f1);
      60        result = 1;
      61      }
      62    else if (strcmp (line, "test2\n") != 0)
      63      {
      64        fprintf (f1, "read \"%s\"\n", line);
      65        result = 1;
      66      }
      67  
      68    if (getline (&line, &len, f3) != -1)
      69      {
      70        fputs ("second getline did not return -1\n", f1);
      71        result = 1;
      72      }
      73  
      74    int ret = pclose (f2);
      75    if (ret != 0)
      76      {
      77        fprintf (f1, "1st pclose returned %d\n", ret);
      78        result = 1;
      79      }
      80  
      81    ret = pclose (f3);
      82    if (ret != 0)
      83      {
      84        fprintf (f1, "2nd pclose returned %d\n", ret);
      85        result = 1;
      86      }
      87  
      88    return result;
      89  }
      90  
      91  #define TEST_FUNCTION do_test ()
      92  #include "../test-skeleton.c"