/*-*- 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; }