175 lines
4.6 KiB
C
175 lines
4.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/mman.h>
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#include <sys/uio.h>
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#include "log.h"
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#include "macro.h"
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#include "util.h"
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#include "sd-memfd.h"
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int main(int argc, char *argv[]) {
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sd_memfd *m;
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char *s;
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uint64_t sz;
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int r, fd;
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FILE *f;
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char buf[3] = {};
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struct iovec iov[3] = {};
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char bufv[3][3] = {};
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log_set_max_level(LOG_DEBUG);
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r = sd_memfd_new(&m);
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if (r == -ENOENT)
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return EXIT_TEST_SKIP;
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r = sd_memfd_map(m, 0, 12, (void**) &s);
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assert_se(r >= 0);
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strcpy(s, "----- world");
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r = sd_memfd_set_sealed(m, 1);
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assert_se(r == -ETXTBSY);
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assert_se(write(sd_memfd_get_fd(m), "he", 2) == 2);
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assert_se(write(sd_memfd_get_fd(m), "XXX", 3) == 3);
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assert_se(streq(s, "heXXX world"));
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/* fix "hello" */
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assert_se(lseek(sd_memfd_get_fd(m), 2, SEEK_SET) == 2);
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assert_se(write(sd_memfd_get_fd(m), "ll", 2) == 2);
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assert_se(sd_memfd_get_file(m, &f) >= 0);
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fputc('o', f);
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fflush(f);
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/* check content */
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assert_se(streq(s, "hello world"));
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assert_se(munmap(s, 12) == 0);
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r = sd_memfd_get_sealed(m);
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assert_se(r == 0);
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r = sd_memfd_get_size(m, &sz);
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assert_se(r >= 0);
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assert_se(sz = page_size());
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/* truncate it */
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r = sd_memfd_set_size(m, 6);
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assert_se(r >= 0);
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/* get back new value */
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r = sd_memfd_get_size(m, &sz);
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assert_se(r >= 0);
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assert_se(sz == 6);
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r = sd_memfd_set_sealed(m, 1);
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assert_se(r >= 0);
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r = sd_memfd_get_sealed(m);
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assert_se(r == 1);
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fd = sd_memfd_dup_fd(m);
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assert_se(fd >= 0);
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sd_memfd_free(m);
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/* new sd_memfd, same underlying memfd */
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r = sd_memfd_make(fd, &m);
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assert_se(r >= 0);
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/* we did truncate it to 6 */
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r = sd_memfd_get_size(m, &sz);
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assert_se(r >= 0 && sz == 6);
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/* map it, check content */
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r = sd_memfd_map(m, 0, 12, (void **)&s);
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assert_se(r >= 0);
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/* we only see the truncated size */
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assert_se(streq(s, "hello "));
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/* it was already sealed */
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r = sd_memfd_set_sealed(m, 1);
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assert_se(r == -EALREADY);
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/* we cannot break the seal, it is mapped */
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r = sd_memfd_set_sealed(m, 0);
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assert_se(r == -ETXTBSY);
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/* unmap it; become the single owner */
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assert_se(munmap(s, 12) == 0);
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/* now we can do flip the sealing */
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r = sd_memfd_set_sealed(m, 0);
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assert_se(r == 0);
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r = sd_memfd_get_sealed(m);
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assert_se(r == 0);
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r = sd_memfd_set_sealed(m, 1);
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assert_se(r == 0);
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r = sd_memfd_get_sealed(m);
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assert_se(r == 1);
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r = sd_memfd_set_sealed(m, 0);
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assert_se(r == 0);
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r = sd_memfd_get_sealed(m);
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assert_se(r == 0);
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/* seek at 2, read() 2 bytes */
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assert_se(lseek(fd, 2, SEEK_SET) == 2);
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assert_se(read(fd, buf, 2) == 2);
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/* check content */
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assert_se(memcmp(buf, "ll", 2) == 0);
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/* writev it out*/
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iov[0].iov_base = (char *)"ABC";
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iov[0].iov_len = 3;
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iov[1].iov_base = (char *)"DEF";
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iov[1].iov_len = 3;
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iov[2].iov_base = (char *)"GHI";
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iov[2].iov_len = 3;
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assert_se(pwritev(fd, iov, 3, 0) == 9);
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/* readv it back */
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iov[0].iov_base = bufv[0];
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iov[0].iov_len = 3;
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iov[1].iov_base = bufv[1];
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iov[1].iov_len = 3;
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iov[2].iov_base = bufv[2];
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iov[2].iov_len = 3;
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assert_se(preadv(fd, iov, 3, 0) == 9);
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/* check content */
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assert_se(memcmp(bufv[0], "ABC", 3) == 0);
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assert_se(memcmp(bufv[1], "DEF", 3) == 0);
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assert_se(memcmp(bufv[2], "GHI", 3) == 0);
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sd_memfd_free(m);
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return 0;
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}
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