1: /* Test for bug in fflush synchronization behavior.  */
    2: 
    3: #include <stdio.h>
    4: #include <stdlib.h>
    5: #include <string.h>
    6: 
    7: 
    8: static char *fname;
    9: 
   10: static void prepare (void);
   11: #define PREPARE(argc, argv) prepare ()
   12: 
   13: 
   14: #define TEST_FUNCTION do_test ()
   15: static int do_test (void);
   16: #include "../test-skeleton.c"
   17: 
   18: 
   19: static void
   20: prepare (void)
   21: {
   22:   int fd = create_temp_file ("bug-mmap-fflush.", &fname);
   23:   if (fd == -1)
   24:     exit (3);
   25:   /* We don't need the descriptor.  */
   26:   close (fd);
   27: }
   28: 
   29: 
   30: static int
   31: do_test (void)
   32: {
   33:   FILE *f;
   34:   off_t o;
   35:   char buffer[1024];
   36: 
   37:   snprintf (buffer, sizeof (buffer), "echo 'From foo@bar.com' > %s", fname);
   38:   system (buffer);
   39:   f = fopen (fname, "r");
   40:   fseek (f, 0, SEEK_END);
   41:   o = ftello (f);
   42:   fseek (f, 0, SEEK_SET);
   43:   fflush (f);
   44:   snprintf (buffer, sizeof (buffer), "echo 'From bar@baz.edu' >> %s", fname);
   45:   system (buffer);
   46:   fseek (f, o, SEEK_SET);
   47:   if (fgets (buffer, 1024, f) == NULL)
   48:     exit (1);
   49:   if (strncmp (buffer, "From ", 5) != 0)
   50:     exit (1);
   51:   fclose (f);
   52:   exit (0);
   53: }