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lseek_test.c
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lseek_test.c
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/* SPDX-License-Identifier: GPL-2.0 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "kselftest.h"
struct test {
const char *const name;
const char *const dev;
const size_t alloc;
const char *const data;
const size_t wsize;
const size_t seek;
int whence;
const size_t rsize;
const size_t size;
const char *const want;
};
static void test(const struct test *restrict t)
{
char path[PATH_MAX];
char buf[t->wsize > t->rsize ? t->wsize : t->wsize];
int ret, fd;
long val;
FILE *fp;
ret = snprintf(path, sizeof(path), "/sys/devices/%s/alloc", t->dev);
if (ret < 0)
goto perr;
fp = fopen(path, "r");
if (!fp)
goto perr;
ret = fread(buf, sizeof(buf), 1, fp);
if (ret == 0 && ferror(fp))
goto perr;
if (fclose(fp) == -1)
goto perr;
val = strtol(buf, NULL, 10);
if (val != t->alloc) {
fprintf(stderr, "%s: unexpected alloc value:\n\t- want: %ld\n\t- got: %ld\n",
t->name, t->alloc, val);
goto err;
}
ret = snprintf(path, sizeof(path), "/dev/%s", t->dev);
if (ret < 0)
goto perr;
fd = open(path, O_RDWR|O_TRUNC);
if (fd == -1)
goto perr;
ret = write(fd, t->data, t->wsize);
if (ret == -1)
goto perr;
if (ret != t->wsize) {
fprintf(stderr, "%s: unexpected write length:\n\t- want: %ld\n\t- got: %d\n",
t->name, t->wsize, ret);
goto err;
}
ret = lseek(fd, t->seek, t->whence);
if (ret == -1)
goto perr;
ret = read(fd, buf, sizeof(buf));
if (ret == -1)
goto perr;
if (ret != t->rsize) {
fprintf(stderr, "%s: unexpected read length:\n\t- want: %ld\n\t- got: %d\n",
t->name, t->rsize, ret);
goto err;
}
if (t->rsize && memcmp(buf, t->want, t->rsize)) {
buf[t->rsize] = '\0';
fprintf(stderr, "%s: unexpected data:\n\t- want: '%s'\n\t- got: '%s'\n",
t->name, buf, t->want);
goto err;
}
if (close(fd) == -1)
goto perr;
ret = snprintf(path, sizeof(path), "/sys/devices/%s/size", t->dev);
if (ret < 0)
goto perr;
fp = fopen(path, "r");
if (!fp)
goto perr;
ret = fread(buf, sizeof(buf), 1, fp);
if (ret == 0 && ferror(fp))
goto perr;
if (fclose(fp) == -1)
goto perr;
val = strtol(buf, NULL, 10);
if (val != t->size) {
fprintf(stderr, "%s: unexpected length:\n\t- want: %ld\n\t- got: %ld\n",
t->name, t->size, val);
goto err;
}
exit(EXIT_SUCCESS);
perr:
perror(t->name);
err:
exit(EXIT_FAILURE);
}
int main(void)
{
const struct test *t, tests[] = {
{
.name = "0 byte SEEK_SET on 16 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "0123456789012345",
.wsize = 16,
.seek = 0,
.whence = SEEK_SET,
.rsize = 16,
.size = 16,
.want = "0123456789012345",
},
{
.name = "8 bytes SEEK_SET on 16 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "0123456789012345",
.wsize = 16,
.seek = 8,
.whence = SEEK_SET,
.rsize = 8,
.size = 16,
.want = "89012345",
},
{
.name = "16 bytes SEEK_SET on 16 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "0123456789012345",
.wsize = 16,
.seek = 16,
.whence = SEEK_SET,
.rsize = 0,
.size = 16,
},
{
.name = "0 byte SEEK_SET on 8 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "01234567",
.wsize = 8,
.seek = 0,
.whence = SEEK_SET,
.rsize = 8,
.size = 8,
.want = "01234567",
},
{
.name = "8 bytes SEEK_SET on 8 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "01234567",
.wsize = 8,
.seek = 8,
.whence = SEEK_SET,
.rsize = 0,
.size = 8,
},
{
.name = "16 bytes SEEK_SET on 8 bytes /dev/lseek16",
.dev = "lseek16",
.alloc = 16,
.data = "01234567",
.wsize = 8,
.seek = 16,
.whence = SEEK_SET,
.rsize = 0,
.size = 16,
},
{
.name = "0 byte SEEK_SET on 64 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 0,
.whence = SEEK_SET,
.rsize = 64,
.size = 64,
.want = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
},
{
.name = "32 bytes SEEK_SET on 64 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 32,
.whence = SEEK_SET,
.rsize = 32,
.size = 64,
.want = "23456789"
"0123456789"
"0123456789"
"0123",
},
{
.name = "64 bytes SEEK_SET on 64 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 64,
.whence = SEEK_SET,
.rsize = 0,
.size = 64,
},
{
.name = "0 byte SEEK_SET on 32 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"01",
.wsize = 32,
.seek = 0,
.whence = SEEK_SET,
.rsize = 32,
.size = 32,
.want = "0123456789"
"0123456789"
"0123456789"
"01",
},
{
.name = "32 bytes SEEK_SET on 32 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"01",
.wsize = 32,
.seek = 32,
.whence = SEEK_SET,
.rsize = 0,
.size = 32,
},
{
.name = "64 bytes SEEK_SET on 32 bytes /dev/lseek64",
.dev = "lseek64",
.alloc = 64,
.data = "0123456789"
"0123456789"
"0123456789"
"01",
.wsize = 32,
.seek = 64,
.whence = SEEK_SET,
.rsize = 0,
.size = 64,
},
{
.name = "0 byte SEEK_SET on 128 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
.wsize = 128,
.seek = 0,
.whence = SEEK_SET,
.rsize = 128,
.size = 128,
.want = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
},
{
.name = "64 bytes SEEK_SET on 128 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
.wsize = 128,
.seek = 64,
.whence = SEEK_SET,
.rsize = 64,
.size = 128,
.want = "456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
},
{
.name = "128 bytes SEEK_SET on 128 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
.wsize = 128,
.seek = 128,
.whence = SEEK_SET,
.rsize = 0,
.size = 128,
},
{
.name = "0 byte SEEK_SET on 64 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 0,
.whence = SEEK_SET,
.rsize = 64,
.size = 64,
.want = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
},
{
.name = "64 bytes SEEK_SET on 64 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 64,
.whence = SEEK_SET,
.rsize = 0,
.size = 64,
},
{
.name = "128 bytes SEEK_SET on 64 bytes /dev/lseek128",
.dev = "lseek128",
.alloc = 128,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123",
.wsize = 64,
.seek = 128,
.whence = SEEK_SET,
.rsize = 0,
.size = 128,
},
{
.name = "0 byte SEEK_SET on 256 bytes /dev/lseek256",
.dev = "lseek256",
.alloc = 256,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"012345",
.wsize = 256,
.seek = 0,
.whence = SEEK_SET,
.rsize = 256,
.size = 256,
.want = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"012345",
},
{
.name = "128 bytes SEEK_SET on 256 bytes /dev/lseek256",
.dev = "lseek256",
.alloc = 256,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"012345",
.wsize = 256,
.seek = 128,
.whence = SEEK_SET,
.rsize = 128,
.size = 256,
.want = "89"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"012345",
},
{
.name = "256 bytes SEEK_SET on 256 bytes /dev/lseek256",
.dev = "lseek256",
.alloc = 256,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"012345",
.wsize = 256,
.seek = 256,
.whence = SEEK_SET,
.rsize = 0,
.size = 256,
},
{
.name = "0 byte SEEK_SET on 128 bytes /dev/lseek256",
.dev = "lseek256",
.alloc = 256,
.data = "0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"0123456789"
"01234567",
.wsize = 128,
.seek = 0,
.whence = SEEK_SET,
.rsize = 128,
.size = 128,
.want = "0123456789"
"0123456789"
"0123456789"
"0123456789"
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