1 | /* Test program for synchronization of stdio state with file after EOF. */ |
2 | |
3 | #include <stdio.h> |
4 | #include <error.h> |
5 | #include <errno.h> |
6 | #include <string.h> |
7 | #include <unistd.h> |
8 | |
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> |
14 | |
15 | static char *temp_file; |
16 | static int temp_fd; |
17 | |
18 | static char *pages; |
19 | |
20 | static void |
21 | do_prepare (void) |
22 | { |
23 | pages = xmalloc (n: getpagesize () * 2); |
24 | memset (pages, 'a', getpagesize ()); |
25 | memset (pages + getpagesize (), 'b', getpagesize ()); |
26 | |
27 | temp_fd = create_temp_file (base: "tst-mmap2-eofsync." , filename: &temp_file); |
28 | if (temp_fd == -1) |
29 | error (status: 1, errno, format: "cannot create temporary file" ); |
30 | else |
31 | { |
32 | ssize_t cc = write (temp_fd, pages, getpagesize ()); |
33 | if (cc != getpagesize ()) |
34 | error (status: 1, errno, format: "cannot write to temporary file" ); |
35 | } |
36 | } |
37 | |
38 | static int |
39 | do_test (void) |
40 | { |
41 | const size_t pagesize = getpagesize (); |
42 | FILE *f; |
43 | char buf[pagesize]; |
44 | int result = 0; |
45 | int c; |
46 | |
47 | f = fopen (temp_file, "rm" ); |
48 | if (f == NULL) |
49 | { |
50 | perror (temp_file); |
51 | return 1; |
52 | } |
53 | |
54 | if (fread (ptr: buf, size: pagesize, n: 1, stream: f) != 1) |
55 | { |
56 | perror ("fread" ); |
57 | return 1; |
58 | } |
59 | |
60 | if (memcmp (buf, pages, pagesize)) |
61 | { |
62 | puts (s: "data mismatch in page 1" ); |
63 | result = 1; |
64 | } |
65 | |
66 | printf (format: "feof = %d, ferror = %d immediately after fread\n" , |
67 | feof (stream: f), ferror (stream: f)); |
68 | |
69 | c = fgetc (stream: f); |
70 | if (c == EOF) |
71 | printf (format: "fgetc -> EOF (feof = %d, ferror = %d)\n" , |
72 | feof (stream: f), ferror (stream: f)); |
73 | else |
74 | { |
75 | printf (format: "fgetc returned %o (feof = %d, ferror = %d)\n" , |
76 | c, feof (stream: f), ferror (stream: f)); |
77 | result = 1; |
78 | } |
79 | |
80 | c = write (temp_fd, pages + pagesize, pagesize); |
81 | if (c == (ssize_t) pagesize) |
82 | printf (format: "wrote more to file\n" ); |
83 | else |
84 | { |
85 | printf (format: "wrote %d != %zd (%m)\n" , c, pagesize); |
86 | result = 1; |
87 | } |
88 | |
89 | if (fread (ptr: buf, size: pagesize, n: 1, stream: f) != 1) |
90 | { |
91 | printf (format: "second fread fails: feof = %d, ferror = %d (%m)\n" , |
92 | feof (stream: f), ferror (stream: f)); |
93 | clearerr (stream: f); |
94 | if (fread (ptr: buf, size: pagesize, n: 1, stream: f) != 1) |
95 | { |
96 | printf (format: "retry fread fails: feof = %d, ferror = %d (%m)\n" , |
97 | feof (stream: f), ferror (stream: f)); |
98 | result = 1; |
99 | } |
100 | } |
101 | if (result == 0 && memcmp (buf, pages + pagesize, pagesize)) |
102 | { |
103 | puts (s: "data mismatch in page 2" ); |
104 | result = 1; |
105 | } |
106 | |
107 | fseek (f, pagesize - 1, SEEK_SET); |
108 | c = fgetc (stream: f); |
109 | if (c != 'a') |
110 | { |
111 | printf (format: "fgetc at end of page 1 read '%c' (%m)\n" , c); |
112 | result = 1; |
113 | } |
114 | |
115 | if (ftruncate (fd: temp_fd, length: pagesize) < 0) |
116 | { |
117 | printf (format: "ftruncate failed: %m\n" ); |
118 | result = 1; |
119 | } |
120 | |
121 | fflush (f); |
122 | |
123 | c = fgetc (stream: f); |
124 | if (c == EOF) |
125 | printf (format: "after truncate fgetc -> EOF (feof = %d, ferror = %d)\n" , |
126 | feof (stream: f), ferror (stream: f)); |
127 | else |
128 | { |
129 | printf (format: "after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n" , |
130 | c, feof (stream: f), ferror (stream: f)); |
131 | result = 1; |
132 | } |
133 | |
134 | fclose (f); |
135 | |
136 | return result; |
137 | } |
138 | |