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glibc/stdio-common/tst-fwrite.c
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/* Derived from the test case in | |
http://sourceware.org/bugzilla/show_bug.cgi?id=1078. */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#define OUT_SIZE 10000 | |
static int fd; | |
static void prepare (void); | |
#define PREPARE(argc, argv) prepare () | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
static void | |
prepare (void) | |
{ | |
fd = create_temp_file ("tst-fwrite.", NULL); | |
if (fd == -1) | |
{ | |
puts ("cannot create temporary file"); | |
exit (1); | |
} | |
} | |
static int | |
do_test (void) | |
{ | |
FILE* f = fdopen (fd, "w+"); | |
if (f == NULL) { | |
puts ("cannot create stream"); | |
return 1; | |
} | |
puts ("Opened temp file"); | |
if (fwrite ("a", 1, 1, f) != 1) | |
{ | |
puts ("1st fwrite failed"); | |
return 1; | |
} | |
puts ("Wrote a byte"); | |
fflush (f); | |
char buffer[10000]; | |
size_t i = fread (buffer, 1, sizeof (buffer), f); | |
printf ("Read %zu bytes\n", i); | |
for (i = 0; i < OUT_SIZE; i++) | |
{ | |
if (fwrite ("n", 1, 1, f) != 1) | |
{ | |
printf ("fwrite in loop round %zu failed\n", i); | |
return 1; | |
} | |
if ((i + 1) % 1000 == 0) | |
printf ("wrote %zu bytes ...\n", i + 1); | |
} | |
printf ("Wrote %i bytes [done]\n", OUT_SIZE); | |
return 0; | |
} |