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glibc/libio/tst-mmap2-eofsync.c
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/* Test program for synchronization of stdio state with file after EOF. */ | |
#include <stdio.h> | |
#include <error.h> | |
#include <errno.h> | |
#include <string.h> | |
#include <unistd.h> | |
static void do_prepare (void); | |
#define PREPARE(argc, argv) do_prepare () | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include <test-skeleton.c> | |
static char *temp_file; | |
static int temp_fd; | |
static char *pages; | |
static void | |
do_prepare (void) | |
{ | |
pages = malloc (getpagesize () * 2); | |
memset (pages, 'a', getpagesize ()); | |
memset (pages + getpagesize (), 'b', getpagesize ()); | |
temp_fd = create_temp_file ("tst-mmap2-eofsync.", &temp_file); | |
if (temp_fd == -1) | |
error (1, errno, "cannot create temporary file"); | |
else | |
{ | |
ssize_t cc = write (temp_fd, pages, getpagesize ()); | |
if (cc != getpagesize ()) | |
error (1, errno, "cannot write to temporary file"); | |
} | |
} | |
static int | |
do_test (void) | |
{ | |
const size_t pagesize = getpagesize (); | |
FILE *f; | |
char buf[pagesize]; | |
int result = 0; | |
int c; | |
f = fopen (temp_file, "rm"); | |
if (f == NULL) | |
{ | |
perror (temp_file); | |
return 1; | |
} | |
if (fread (buf, pagesize, 1, f) != 1) | |
{ | |
perror ("fread"); | |
return 1; | |
} | |
if (memcmp (buf, pages, pagesize)) | |
{ | |
puts ("data mismatch in page 1"); | |
result = 1; | |
} | |
printf ("feof = %d, ferror = %d immediately after fread\n", | |
feof (f), ferror (f)); | |
c = fgetc (f); | |
if (c == EOF) | |
printf ("fgetc -> EOF (feof = %d, ferror = %d)\n", | |
feof (f), ferror (f)); | |
else | |
{ | |
printf ("fgetc returned %o (feof = %d, ferror = %d)\n", | |
c, feof (f), ferror (f)); | |
result = 1; | |
} | |
c = write (temp_fd, pages + pagesize, pagesize); | |
if (c == (ssize_t) pagesize) | |
printf ("wrote more to file\n"); | |
else | |
{ | |
printf ("wrote %d != %zd (%m)\n", c, pagesize); | |
result = 1; | |
} | |
if (fread (buf, pagesize, 1, f) != 1) | |
{ | |
printf ("second fread fails: feof = %d, ferror = %d (%m)\n", | |
feof (f), ferror (f)); | |
clearerr (f); | |
if (fread (buf, pagesize, 1, f) != 1) | |
{ | |
printf ("retry fread fails: feof = %d, ferror = %d (%m)\n", | |
feof (f), ferror (f)); | |
result = 1; | |
} | |
} | |
if (result == 0 && memcmp (buf, pages + pagesize, pagesize)) | |
{ | |
puts ("data mismatch in page 2"); | |
result = 1; | |
} | |
fseek (f, pagesize - 1, SEEK_SET); | |
c = fgetc (f); | |
if (c != 'a') | |
{ | |
printf ("fgetc at end of page 1 read '%c' (%m)\n", c); | |
result = 1; | |
} | |
if (ftruncate (temp_fd, pagesize) < 0) | |
{ | |
printf ("ftruncate failed: %m\n"); | |
result = 1; | |
} | |
fflush (f); | |
c = fgetc (f); | |
if (c == EOF) | |
printf ("after truncate fgetc -> EOF (feof = %d, ferror = %d)\n", | |
feof (f), ferror (f)); | |
else | |
{ | |
printf ("after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n", | |
c, feof (f), ferror (f)); | |
result = 1; | |
} | |
fclose (f); | |
return result; | |
} |