| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 41 | f = fopen (temp_file, "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 | { |
| 74 | printf ("wrote %d != %zd (%m)\n", c, sizeof text2 - 1); |
| 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 | } |