1: #include <fcntl.h>
    2: #include <stdio.h>
    3: #include <string.h>
    4: #include <unistd.h>
    5: 
    6: static int fd;
    7: static char *fname;
    8: 
    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:   fd = create_temp_file ("wrewind.", &fname);
   23:   if (fd == -1)
   24:     exit (3);
   25: }
   26: 
   27: 
   28: static int
   29: do_test (void)
   30: {
   31:   char buf[100];
   32:   FILE *fp;
   33:   int result = 0;
   34: 
   35:   fp = fdopen (fd, "w");
   36:   if (fp == NULL)
   37:     {
   38:       puts ("cannot create file");
   39:       exit (1);
   40:     }
   41: 
   42:   if (fputs ("one\n", fp) == EOF || fputs ("two\n", fp) == EOF)
   43:     {
   44:       puts ("cannot create filec content");
   45:       exit (1);
   46:     }
   47: 
   48:   fclose (fp);
   49: 
   50:   fp = fopen (fname, "a+");
   51:   if (fp == NULL)
   52:     {
   53:       puts ("cannot fopen a+");
   54:       exit (1);
   55:     }
   56: 
   57:   if (fgets (buf, sizeof (buf), fp) == NULL)
   58:     {
   59:       puts ("cannot read after fopen a+");
   60:       exit (1);
   61:     }
   62: 
   63:   if (strcmp (buf, "one\n") != 0)
   64:     {
   65:       puts ("read after fopen a+ produced wrong result");
   66:       result = 1;
   67:     }
   68: 
   69:   fclose (fp);
   70: 
   71:   fd = open (fname, O_RDWR);
   72:   if (fd == -1)
   73:     {
   74:       puts ("open failed");
   75:       exit (1);
   76:     }
   77: 
   78:   fp = fdopen (fd, "a+");
   79:   if (fp == NULL)
   80:     {
   81:       puts ("fopen after open failed");
   82:       exit (1);
   83:     }
   84: 
   85:   if (fgets (buf, sizeof (buf), fp) == NULL)
   86:     {
   87:       puts ("cannot read after fdopen a+");
   88:       exit (1);
   89:     }
   90: 
   91:   if (strcmp (buf, "one\n") != 0)
   92:     {
   93:       puts ("read after fdopen a+ produced wrong result");
   94:       result = 1;
   95:     }
   96: 
   97:   fclose (fp);
   98: 
   99:   return result;
  100: }