1  #include <windows.h>
       2  #include <io.h>
       3  #include <errno.h>
       4  #include <stdio.h>
       5  #include <string.h>
       6  #include <stdlib.h>
       7  #include <fcntl.h>
       8  
       9  #ifdef __CYGWIN__
      10  /* For read() and write() */
      11  #include <unistd.h>
      12  /* Cygwin does not prototype __argc and __argv in stdlib.h */
      13  extern int __argc;
      14  extern char** __argv;
      15  #endif
      16  
      17  int _stdcall
      18  WinMain (struct HINSTANCE__ *hInstance,
      19  	struct HINSTANCE__ *hPrevInstance,
      20  	char *lpszCmdLine,
      21  	int   nCmdShow)
      22  {
      23    if (__argc >= 2 && strcmp (__argv[1], "print_argv0") == 0)
      24      {
      25        printf ("%s", __argv[0]);
      26      }
      27    else if (__argc <= 2)
      28      {
      29        printf ("# This is stdout\n");
      30        fflush (stdout);
      31        
      32        fprintf (stderr, "This is stderr\n");
      33        fflush (stderr);
      34      }
      35    else if (__argc == 4 && strcmp (__argv[1], "pipes") == 0)
      36      {
      37        int infd = atoi (__argv[2]);
      38        int outfd = atoi (__argv[3]);
      39        int k, n;
      40        char buf[100] = {0};
      41  
      42        if (infd < 0 || outfd < 0)
      43  	{
      44            fprintf (stderr, "spawn-test-win32-gui: illegal fds on command line %s\n",
      45  		      lpszCmdLine);
      46  	  exit (1);
      47  	}
      48  
      49        n = strlen ("Hello there");
      50        if (write (outfd, &n, sizeof (n)) == -1 ||
      51  	  write (outfd, "Hello there\n", n) == -1)
      52  	{
      53  	  int errsv = errno;
      54            fprintf (stderr, "spawn-test-win32-gui: Write error: %s\n", strerror (errsv));
      55  	  exit (1);
      56  	}
      57  
      58        if ((k = read (infd, &n, sizeof (n))) != sizeof (n))
      59  	{
      60            fprintf (stderr, "spawn-test-win32-gui: Got only %d bytes, wanted %d\n",
      61  		   k, (int)sizeof (n));
      62  	  exit (1);
      63  	}
      64  
      65        fprintf (stderr, "spawn-test-win32-gui: Parent says %d bytes to read\n", n);
      66  
      67        if ((k = read (infd, buf, n)) != n)
      68  	{
      69  	  int errsv = errno;
      70  	  if (k == -1)
      71              fprintf (stderr, "spawn-test-win32-gui: Read error: %s\n", strerror (errsv));
      72  	  else
      73              fprintf (stderr, "spawn-test-win32-gui: Got only %d bytes\n", k);
      74  	  exit (1);
      75  	}
      76  
      77        n = strlen ("See ya");
      78        if (write (outfd, &n, sizeof (n)) == -1 ||
      79  	  write (outfd, "See ya", n) == -1)
      80  	{
      81  	  int errsv = errno;
      82            fprintf (stderr, "spawn-test-win32-gui: Write error: %s\n", strerror (errsv));
      83  	  exit (1);
      84  	}
      85      }
      86  
      87    return 0;
      88  }