some code logic in diotest4.c likes below:
----
ret = lseek(fd, offset, SEEK_SET);
if ((ret >= 0) || (errno != EINVAL)) {
tst_resm(TFAIL, "lseek allows negative offset. returns %d:%s", ret,
strerror(errno));
failed = TRUE;
fail_count++;
} else
tst_resm(TPASS, "Negative Offset");
....
....
ret = read(fd, buf, count);
if (ret >= 0 || errno != errnum) {
tst_resm(TFAIL, "read allows %s. returns %d: %s", msg, ret,
strerror(errno));
l_fail = TRUE;
}
----
If lseek() EINVAL and read() return >= 0, the errno will not be setted to 0. The
errno will still be EINVAL.
I hit this problem when test on nfs. In NFS, lseek() return EINVAL as excepted,
but the read() will return 1, when count = 1. But the errno is still EINVAL.
That's incorrect.
So I set errno = 0, before read() and all other functions which like this.
Signed-off-by: Zorro Lang <zl...@redhat.com>
---
Hi,
The problem likes above commit messge. Please review.
Thank you,
Zorro Lang
testcases/kernel/io/direct_io/diotest4.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/testcases/kernel/io/direct_io/diotest4.c
b/testcases/kernel/io/direct_io/diotest4.c
index fa90a1e..82c5b33 100644
--- a/testcases/kernel/io/direct_io/diotest4.c
+++ b/testcases/kernel/io/direct_io/diotest4.c
@@ -107,6 +107,7 @@ runtest_f(int fd, char *buf, int offset, int count, int
errnum, int testnum,
l_fail = TRUE;
}
} else {
+ errno = 0;
ret = read(fd, buf, count);
if (ret >= 0 || errno != errnum) {
tst_resm(TFAIL, "read allows %s. returns %d: %s",
@@ -121,6 +122,7 @@ runtest_f(int fd, char *buf, int offset, int count, int
errnum, int testnum,
l_fail = TRUE;
}
} else {
+ errno = 0;
ret = write(fd, buf, count);
if (ret >= 0 || errno != errnum) {
tst_resm(TFAIL, "write allows %s.returns %d: %s",
@@ -247,6 +249,7 @@ int main(int argc, char *argv[])
/* Test-1: Negative Offset */
offset = -1;
count = bufsize;
+ errno = 0;
ret = lseek(fd, offset, SEEK_SET);
if ((ret >= 0) || (errno != EINVAL)) {
tst_resm(TFAIL, "lseek allows negative offset. returns %d:%s",
@@ -284,6 +287,7 @@ int main(int argc, char *argv[])
fail_count++;
tst_resm(TFAIL, "Read beyond the file size");
} else {
+ errno = 0;
ret = read(fd, buf2, count);
if (ret > 0 || (ret < 0 && errno != EINVAL)) {
tst_resm(TFAIL,
@@ -392,6 +396,7 @@ int main(int argc, char *argv[])
failed = TRUE;
fail_count++;
} else {
+ errno = 0;
ret = read(fd, buf2, count);
if (ret >= 0 || errno != EBADF) {
tst_resm(TFAIL,
@@ -417,6 +422,7 @@ int main(int argc, char *argv[])
failed = TRUE;
fail_count++;
} else {
+ errno = 0;
ret = write(fd, buf2, count);
if (ret >= 0 || errno != EBADF) {
tst_resm(TFAIL,
@@ -460,6 +466,7 @@ int main(int argc, char *argv[])
strerror(errno));
l_fail = TRUE;
} else {
+ errno = 0;
ret = read(fd, (char *)((ulong) ADDRESS_OF_MAIN & pagemask),
count);
if (ret >= 0 || errno != EFAULT) {
--
1.9.3
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