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When extending a file with truncate, check that newly added bytes have

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a value of 0 in the extended region.

Make sure that we get EINVAL back if we try to truncate a read-only
file descriptor.
This commit is contained in:
Robert Watson 2006-07-09 10:56:36 +00:00
parent 17d6f0e53b
commit b0388d6b91
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=160201
1 changed files with 55 additions and 21 deletions
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76
tools/regression/file/ftruncate/ftruncate.c
View File

@ -31,11 +31,6 @@
*
* Future tests that might be of interest:
*
* - Make sure that files grown via ftruncate() return 0 bytes for data
* reads.
*
* - Make sure that we can't ftruncate on a read-only descriptor.
*
* - Make sure we get EISDIR on a directory.
*/
@ -46,35 +41,51 @@
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>
/*
* Select various potentially interesting sizes at and around power of 2
* Select various potentially interesting lengths at and around power of 2
* edges.
*/
static off_t sizes[] = {0, 1, 2, 3, 4, 127, 128, 129, 511, 512, 513, 1023,
static off_t lengths[] = {0, 1, 2, 3, 4, 127, 128, 129, 511, 512, 513, 1023,
1024, 1025, 2047, 2048, 2049, 4095, 4096, 4097, 8191, 8192, 8193, 16383,
16384, 16385};
static int size_count = sizeof(sizes) / sizeof(off_t);
static int lengths_count = sizeof(lengths) / sizeof(off_t);
int
main(int argc, char *argv[])
{
int error, fd, fds[2], i, read_only_fd;
char path[PATH_MAX];
int fd, fds[2], i;
struct stat sb;
size_t size;
off_t len;
char ch;
/*
* Tests using a writable temporary file: grow and then shrink a file
* using ftruncate and various sizes. Make sure that a negative file
* size is rejected.
* using ftruncate and various lengths. Make sure that a negative
* file length is rejected. Make sure that when we grow the file,
* bytes now in the range of the file size return 0.
*
* Save a read-only reference to the file to use later for read-only
* descriptor tests.
*/
snprintf(path, PATH_MAX, "/tmp/ftruncate.XXXXXXXXXXXXX");
fd = mkstemp(path);
if (fd < 0)
err(-1, "makestemp");
read_only_fd = open(path, O_RDONLY);
if (read_only_fd < 0) {
error = errno;
(void)unlink(path);
errno = error;
err(-1, "open(%s, O_RDONLY)", path);
}
(void)unlink(path);
if (ftruncate(fd, -1) == 0)
@ -82,27 +93,50 @@ main(int argc, char *argv[])
if (errno != EINVAL)
err(-1, "ftruncate(fd, -1) returned wrong error");
for (i = 0; i < size_count; i++) {
if (ftruncate(fd, sizes[i]) < 0)
err(-1, "ftruncate(%llu) up", sizes[i]);
for (i = 0; i < lengths_count; i++) {
len = lengths[i];
if (ftruncate(fd, len) < 0)
err(-1, "ftruncate(%llu) up", len);
if (fstat(fd, &sb) < 0)
err(-1, "stat");
if (sb.st_size != sizes[i])
errx(-1, "fstat(%llu) returned %llu up", sizes[i],
if (sb.st_size != len)
errx(-1, "fstat(%llu) returned len %llu up", len,
sb.st_size);
if (len != 0) {
size = pread(fd, &ch, sizeof(ch), len - 1);
if (size < 0)
err(-1, "pread on len %llu up", len);
if (size != sizeof(ch))
errx(-1, "pread len %llu size %jd up",
len, (intmax_t)size);
if (ch != 0)
errx(-1,
"pread length %llu size %jd ch %d up",
len, (intmax_t)size, ch);
}
}
for (i = size_count - 1; i >= 0; i--) {
if (ftruncate(fd, sizes[i]) < 0)
err(-1, "ftruncate(%llu) down", sizes[i]);
for (i = lengths_count - 1; i >= 0; i--) {
len = lengths[i];
if (ftruncate(fd, len) < 0)
err(-1, "ftruncate(%llu) down", len);
if (fstat(fd, &sb) < 0)
err(-1, "stat");
if (sb.st_size != sizes[i])
errx(-1, "fstat(%llu) returned %llu down", sizes[i],
if (sb.st_size != len)
errx(-1, "fstat(%llu) returned %llu down", len,
sb.st_size);
}
close(fd);
/*
* Make sure that a read-only descriptor can't be truncated.
*/
if (ftruncate(read_only_fd, 0) == 0)
errx(-1, "ftruncate(read_only_fd) succeeded");
if (errno != EINVAL)
err(-1, "ftruncate(read_only_fd) returned wrong error");
close(read_only_fd);
/*
* Make sure that ftruncate on sockets doesn't work.
*/