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Diffstat (limited to 'src/libsystemd-bus/test-bus-memfd.c')
-rw-r--r--src/libsystemd-bus/test-bus-memfd.c81
1 files changed, 75 insertions, 6 deletions
diff --git a/src/libsystemd-bus/test-bus-memfd.c b/src/libsystemd-bus/test-bus-memfd.c
index 37e150a397..3300470e0f 100644
--- a/src/libsystemd-bus/test-bus-memfd.c
+++ b/src/libsystemd-bus/test-bus-memfd.c
@@ -33,6 +33,9 @@ int main(int argc, char *argv[]) {
uint64_t sz;
int r, fd;
FILE *f;
+ char buf[3] = {};
+ struct iovec iov[3] = {};
+ char bufv[3][3] = {};
log_set_max_level(LOG_DEBUG);
@@ -49,12 +52,20 @@ int main(int argc, char *argv[]) {
assert_se(r == -EPERM);
assert_se(write(sd_memfd_get_fd(m), "he", 2) == 2);
+ assert_se(write(sd_memfd_get_fd(m), "XXX", 3) == 3);
+ assert_se(streq(s, "heXXX world"));
+
+ /* fix "hello" */
+ assert_se(lseek(sd_memfd_get_fd(m), 2, SEEK_SET) == 2);
assert_se(write(sd_memfd_get_fd(m), "ll", 2) == 2);
assert_se(sd_memfd_get_file(m, &f) >= 0);
fputc('o', f);
fflush(f);
+ /* check content */
+ assert_se(streq(s, "hello world"));
+
assert_se(munmap(s, 12) == 0);
r = sd_memfd_get_sealed(m);
@@ -64,9 +75,15 @@ int main(int argc, char *argv[]) {
assert_se(r >= 0);
assert_se(sz = page_size());
- r = sd_memfd_set_size(m, 12);
+ /* truncate it */
+ r = sd_memfd_set_size(m, 6);
assert_se(r >= 0);
+ /* get back new value */
+ r = sd_memfd_get_size(m, &sz);
+ assert_se(r >= 0);
+ assert_se(sz == 6);
+
r = sd_memfd_set_sealed(m, 1);
assert_se(r >= 0);
@@ -78,27 +95,79 @@ int main(int argc, char *argv[]) {
sd_memfd_free(m);
+ /* new sd_memfd, same underlying memfd */
r = sd_memfd_make(fd, &m);
assert_se(r >= 0);
+ /* we did truncate it to 6 */
r = sd_memfd_get_size(m, &sz);
- assert_se(r >= 0);
- assert_se(sz = 12);
+ assert_se(sz == 6);
- r = sd_memfd_map(m, 0, 12, (void**) &s);
+ /* map it, check content */
+ r = sd_memfd_map(m, 0, 12, (void **)&s);
assert_se(r >= 0);
+ /* we only see the truncated size */
+ assert_se(streq(s, "hello "));
+
+ /* it was already sealed */
r = sd_memfd_set_sealed(m, 1);
assert_se(r == -EALREADY);
+ /* we cannot break the seal, it is mapped */
r = sd_memfd_set_sealed(m, 0);
assert_se(r == -EPERM);
- assert_se(streq(s, "hello world"));
+ /* unmap it; become the single owner */
assert_se(munmap(s, 12) == 0);
+ /* now we can do flip the sealing */
r = sd_memfd_set_sealed(m, 0);
- assert_se(r >= 0);
+ assert_se(r == 0);
+ r = sd_memfd_get_sealed(m);
+ assert_se(r == 0);
+
+ r = sd_memfd_set_sealed(m, 1);
+ assert_se(r == 0);
+ r = sd_memfd_get_sealed(m);
+ assert_se(r == 1);
+
+ r = sd_memfd_set_sealed(m, 0);
+ assert_se(r == 0);
+ r = sd_memfd_get_sealed(m);
+ assert_se(r == 0);
+
+ /* seek at 2, read() 2 bytes */
+ assert_se(lseek(fd, 2, SEEK_SET) == 2);
+ assert_se(read(fd, buf, 2) == 2);
+
+ /* check content */
+ assert_se(memcmp(buf, "ll", 2) == 0);
+
+ /* writev it out*/
+ iov[0].iov_base = (char *)"ABC";
+ iov[0].iov_len = 3;
+ iov[1].iov_base = (char *)"DEF";
+ iov[1].iov_len = 3;
+ iov[2].iov_base = (char *)"GHI";
+ iov[2].iov_len = 3;
+ assert_se(lseek(fd, 0, SEEK_SET) == 0);
+ assert_se(writev(fd, iov, 3) == 9);
+
+ /* readv it back */
+ iov[0].iov_base = bufv[0];
+ iov[0].iov_len = 3;
+ iov[1].iov_base = bufv[1];
+ iov[1].iov_len = 3;
+ iov[2].iov_base = bufv[2];
+ iov[2].iov_len = 3;
+ assert_se(lseek(fd, 0, SEEK_SET) == 0);
+ assert_se(readv(fd, iov, 3) == 9);
+
+ /* check content */
+ assert_se(memcmp(bufv[0], "ABC", 3) == 0);
+ assert_se(memcmp(bufv[1], "DEF", 3) == 0);
+ assert_se(memcmp(bufv[2], "GHI", 3) == 0);
sd_memfd_free(m);