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Commit | Line | Data |
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acbee5f6 RM |
1 | /* Test program for synchronization of stdio state with file after fflush. */ |
2 | ||
3 | #include <stdio.h> | |
4 | #include <error.h> | |
5 | #include <errno.h> | |
6 | ||
7 | static void do_prepare (void); | |
8 | #define PREPARE(argc, argv) do_prepare () | |
9 | static int do_test (void); | |
10 | #define TEST_FUNCTION do_test () | |
11 | #include <test-skeleton.c> | |
12 | ||
13 | static char *temp_file; | |
14 | static int temp_fd; | |
15 | ||
16 | static char text1[] = "Line the first\n"; | |
17 | static char text2[] = "Line the second\n"; | |
18 | ||
19 | static void | |
20 | do_prepare (void) | |
21 | { | |
22 | temp_fd = create_temp_file ("tst-mmap-eofsync.", &temp_file); | |
23 | if (temp_fd == -1) | |
24 | error (1, errno, "cannot create temporary file"); | |
25 | else | |
26 | { | |
27 | ssize_t cc = write (temp_fd, text1, sizeof text1 - 1); | |
28 | if (cc != sizeof text1 - 1) | |
29 | error (1, errno, "cannot write to temporary file"); | |
30 | } | |
31 | } | |
32 | ||
33 | static int | |
34 | do_test (void) | |
35 | { | |
36 | FILE *f; | |
37 | char buf[128]; | |
38 | int result = 0; | |
39 | int c; | |
40 | ||
1ce8aaae | 41 | f = fopen (temp_file, "rm"); |
acbee5f6 RM |
42 | if (f == NULL) |
43 | { | |
44 | perror (temp_file); | |
45 | return 1; | |
46 | } | |
47 | ||
48 | if (fgets (buf, sizeof buf, f) == NULL) | |
49 | { | |
50 | perror ("fgets"); | |
51 | return 1; | |
52 | } | |
53 | ||
54 | if (strcmp (buf, text1)) | |
55 | { | |
56 | printf ("read \"%s\", expected \"%s\"\n", buf, text1); | |
57 | result = 1; | |
58 | } | |
59 | ||
60 | printf ("feof = %d, ferror = %d immediately after fgets\n", | |
61 | feof (f), ferror (f)); | |
62 | ||
63 | if (fflush (f) != 0) | |
64 | { | |
65 | printf ("fflush failed! %m\n"); | |
66 | result = 1; | |
67 | } | |
68 | ||
69 | c = write (temp_fd, text2, sizeof text2 - 1); | |
70 | if (c == sizeof text2 - 1) | |
71 | printf ("wrote more to file\n"); | |
72 | else | |
73 | { | |
6d497bbe | 74 | printf ("wrote %d != %zd (%m)\n", c, sizeof text2 - 1); |
acbee5f6 RM |
75 | result = 1; |
76 | } | |
77 | ||
78 | if (fgets (buf, sizeof buf, f) == NULL) | |
79 | { | |
80 | printf ("second fgets fails: feof = %d, ferror = %d (%m)\n", | |
81 | feof (f), ferror (f)); | |
82 | clearerr (f); | |
83 | if (fgets (buf, sizeof buf, f) == NULL) | |
84 | { | |
85 | printf ("retry fgets fails: feof = %d, ferror = %d (%m)\n", | |
86 | feof (f), ferror (f)); | |
87 | result = 1; | |
88 | } | |
89 | } | |
90 | if (result == 0 && strcmp (buf, text2)) | |
91 | { | |
92 | printf ("second time read \"%s\", expected \"%s\"\n", buf, text2); | |
93 | result = 1; | |
94 | } | |
95 | ||
96 | fclose (f); | |
97 | ||
98 | return result; | |
99 | } |