ldbl-128ibm-compat: link tst-ldbl-efgcvt against loader too
[glibc.git] / libio / tst-mmap2-eofsync.c
blob05dedb8c2066060335242bc3db5745d26e178ae1
1 /* Test program for synchronization of stdio state with file after EOF. */
3 #include <stdio.h>
4 #include <error.h>
5 #include <errno.h>
6 #include <string.h>
7 #include <unistd.h>
9 static void do_prepare (void);
10 #define PREPARE(argc, argv) do_prepare ()
11 static int do_test (void);
12 #define TEST_FUNCTION do_test ()
13 #include <test-skeleton.c>
15 static char *temp_file;
16 static int temp_fd;
18 static char *pages;
20 static void
21 do_prepare (void)
23 pages = xmalloc (getpagesize () * 2);
24 memset (pages, 'a', getpagesize ());
25 memset (pages + getpagesize (), 'b', getpagesize ());
27 temp_fd = create_temp_file ("tst-mmap2-eofsync.", &temp_file);
28 if (temp_fd == -1)
29 error (1, errno, "cannot create temporary file");
30 else
32 ssize_t cc = write (temp_fd, pages, getpagesize ());
33 if (cc != getpagesize ())
34 error (1, errno, "cannot write to temporary file");
38 static int
39 do_test (void)
41 const size_t pagesize = getpagesize ();
42 FILE *f;
43 char buf[pagesize];
44 int result = 0;
45 int c;
47 f = fopen (temp_file, "rm");
48 if (f == NULL)
50 perror (temp_file);
51 return 1;
54 if (fread (buf, pagesize, 1, f) != 1)
56 perror ("fread");
57 return 1;
60 if (memcmp (buf, pages, pagesize))
62 puts ("data mismatch in page 1");
63 result = 1;
66 printf ("feof = %d, ferror = %d immediately after fread\n",
67 feof (f), ferror (f));
69 c = fgetc (f);
70 if (c == EOF)
71 printf ("fgetc -> EOF (feof = %d, ferror = %d)\n",
72 feof (f), ferror (f));
73 else
75 printf ("fgetc returned %o (feof = %d, ferror = %d)\n",
76 c, feof (f), ferror (f));
77 result = 1;
80 c = write (temp_fd, pages + pagesize, pagesize);
81 if (c == (ssize_t) pagesize)
82 printf ("wrote more to file\n");
83 else
85 printf ("wrote %d != %zd (%m)\n", c, pagesize);
86 result = 1;
89 if (fread (buf, pagesize, 1, f) != 1)
91 printf ("second fread fails: feof = %d, ferror = %d (%m)\n",
92 feof (f), ferror (f));
93 clearerr (f);
94 if (fread (buf, pagesize, 1, f) != 1)
96 printf ("retry fread fails: feof = %d, ferror = %d (%m)\n",
97 feof (f), ferror (f));
98 result = 1;
101 if (result == 0 && memcmp (buf, pages + pagesize, pagesize))
103 puts ("data mismatch in page 2");
104 result = 1;
107 fseek (f, pagesize - 1, SEEK_SET);
108 c = fgetc (f);
109 if (c != 'a')
111 printf ("fgetc at end of page 1 read '%c' (%m)\n", c);
112 result = 1;
115 if (ftruncate (temp_fd, pagesize) < 0)
117 printf ("ftruncate failed: %m\n");
118 result = 1;
121 fflush (f);
123 c = fgetc (f);
124 if (c == EOF)
125 printf ("after truncate fgetc -> EOF (feof = %d, ferror = %d)\n",
126 feof (f), ferror (f));
127 else
129 printf ("after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n",
130 c, feof (f), ferror (f));
131 result = 1;
134 fclose (f);
136 return result;