100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/* Test program for synchronization of stdio state with file after fflush. */
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#include <stdio.h>
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#include <error.h>
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#include <errno.h>
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static void do_prepare (void);
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#define PREPARE(argc, argv) do_prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include <test-skeleton.c>
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static char *temp_file;
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static int temp_fd;
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static char text1[] = "Line the first\n";
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static char text2[] = "Line the second\n";
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static void
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do_prepare (void)
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{
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temp_fd = create_temp_file ("tst-mmap-eofsync.", &temp_file);
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if (temp_fd == -1)
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error (1, errno, "cannot create temporary file");
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else
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{
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ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
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if (cc != sizeof text1 - 1)
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error (1, errno, "cannot write to temporary file");
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}
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}
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static int
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do_test (void)
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{
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FILE *f;
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char buf[128];
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int result = 0;
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int c;
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f = fopen (temp_file, "rm");
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if (f == NULL)
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{
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perror (temp_file);
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return 1;
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}
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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perror ("fgets");
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return 1;
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}
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if (strcmp (buf, text1))
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{
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printf ("read \"%s\", expected \"%s\"\n", buf, text1);
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result = 1;
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}
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printf ("feof = %d, ferror = %d immediately after fgets\n",
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feof (f), ferror (f));
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if (fflush (f) != 0)
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{
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printf ("fflush failed! %m\n");
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result = 1;
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}
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c = write (temp_fd, text2, sizeof text2 - 1);
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if (c == sizeof text2 - 1)
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printf ("wrote more to file\n");
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else
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{
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printf ("wrote %d != %zd (%m)\n", c, sizeof text2 - 1);
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result = 1;
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}
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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printf ("second fgets fails: feof = %d, ferror = %d (%m)\n",
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feof (f), ferror (f));
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clearerr (f);
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if (fgets (buf, sizeof buf, f) == NULL)
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{
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printf ("retry fgets fails: feof = %d, ferror = %d (%m)\n",
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feof (f), ferror (f));
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result = 1;
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}
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}
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if (result == 0 && strcmp (buf, text2))
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{
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printf ("second time read \"%s\", expected \"%s\"\n", buf, text2);
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result = 1;
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}
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fclose (f);
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return result;
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}
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