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Diffstat (limited to 'src/libsystemd/test-bus-memfd.c')
-rw-r--r--src/libsystemd/test-bus-memfd.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/src/libsystemd/test-bus-memfd.c b/src/libsystemd/test-bus-memfd.c
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+++ b/src/libsystemd/test-bus-memfd.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/mman.h>
+#include <sys/uio.h>
+
+#include "log.h"
+#include "macro.h"
+#include "util.h"
+
+#include "sd-memfd.h"
+
+int main(int argc, char *argv[]) {
+ sd_memfd *m;
+ char *s;
+ 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);
+
+ r = sd_memfd_new(&m);
+ if (r == -ENOENT)
+ return EXIT_TEST_SKIP;
+
+ r = sd_memfd_map(m, 0, 12, (void**) &s);
+ assert_se(r >= 0);
+
+ strcpy(s, "----- world");
+
+ r = sd_memfd_set_sealed(m, 1);
+ assert_se(r == -ETXTBSY);
+
+ 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);
+ assert_se(r == 0);
+
+ r = sd_memfd_get_size(m, &sz);
+ assert_se(r >= 0);
+ assert_se(sz = page_size());
+
+ /* 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);
+
+ r = sd_memfd_get_sealed(m);
+ assert_se(r == 1);
+
+ fd = sd_memfd_dup_fd(m);
+ assert_se(fd >= 0);
+
+ 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 && sz == 6);
+
+ /* 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 == -ETXTBSY);
+
+ /* 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);
+ 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(pwritev(fd, iov, 3, 0) == 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(preadv(fd, iov, 3, 0) == 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);
+
+ return 0;
+}