memfd: move code from public library to src/shared

Don't expose generic kernel API via libsystemd, but keep the code internal
for our own usage.

2 files changed, 1 insertions, 309 deletions

diff --git a/src/libsystemd/sd-bus/sd-memfd.c b/src/libsystemd/sd-bus/sd-memfd.c
deleted file mode 100644
index 16d09e3e14..0000000000
--- a/src/libsystemd/sd-bus/sd-memfd.c
+++ /dev/null
@@ -1,308 +0,0 @@
-/*-*- 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 <stdio.h>
-#include <fcntl.h>
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-#include <sys/prctl.h>
-
-#include "util.h"
-#include "bus-label.h"
-#include "missing.h"
-
-#include "sd-memfd.h"
-#include "sd-bus.h"
-
-struct sd_memfd {
-        int fd;
-        FILE *f;
-};
-
-_public_ int sd_memfd_new(sd_memfd **m, const char *name) {
-
-        _cleanup_close_ int kdbus = -1;
-        _cleanup_free_ char *g = NULL;
-        sd_memfd *n;
-
-        assert_return(m, -EINVAL);
-
-        kdbus = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
-        if (kdbus < 0)
-                return -errno;
-
-        if (name) {
-                /* The kernel side is pretty picky about the character
-                 * set here, let's do the usual bus escaping to deal
-                 * with that. */
-
-                g = bus_label_escape(name);
-                if (!g)
-                        return -ENOMEM;
-
-                name = g;
-
-        } else {
-                char pr[17] = {};
-
-                /* If no name is specified we generate one. We include
-                 * a hint indicating our library implementation, and
-                 * add the thread name to it */
-
-                assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
-
-                if (isempty(pr))
-                        name = "sd";
-                else {
-                        _cleanup_free_ char *e = NULL;
-
-                        e = bus_label_escape(pr);
-                        if (!e)
-                                return -ENOMEM;
-
-                        g = strappend("sd-", e);
-                        if (!g)
-                                return -ENOMEM;
-
-                        name = g;
-                }
-        }
-
-        n = new0(struct sd_memfd, 1);
-        if (!n)
-                return -ENOMEM;
-
-        n->fd = memfd_create(name, 0, MFD_ALLOW_SEALING);
-        if (n->fd < 0) {
-                free(n);
-                return -errno;
-        }
-
-        *m = n;
-        return 0;
-}
-
-_public_ int sd_memfd_new_from_fd(sd_memfd **m, int fd) {
-        sd_memfd *n;
-
-        assert_return(m, -EINVAL);
-        assert_return(fd >= 0, -EINVAL);
-
-        /* Check if this is a sealable fd */
-        if (fcntl(fd, F_GET_SEALS) < 0)
-                return -ENOTTY;
-
-        n = new0(struct sd_memfd, 1);
-        if (!n)
-                return -ENOMEM;
-
-        n->fd = fd;
-        *m = n;
-
-        return 0;
-}
-
-_public_ void sd_memfd_free(sd_memfd *m) {
-        if (!m)
-                return;
-
-        if (m->f)
-                fclose(m->f);
-        else
-                safe_close(m->fd);
-
-        free(m);
-}
-
-_public_ int sd_memfd_get_fd(sd_memfd *m) {
-        assert_return(m, -EINVAL);
-
-        return m->fd;
-}
-
-_public_ int sd_memfd_get_file(sd_memfd *m, FILE **f) {
-        assert_return(m, -EINVAL);
-        assert_return(f, -EINVAL);
-
-        if (!m->f) {
-                m->f = fdopen(m->fd, "r+");
-                if (!m->f)
-                        return -errno;
-        }
-
-        *f = m->f;
-        return 0;
-}
-
-_public_ int sd_memfd_dup_fd(sd_memfd *m) {
-        int fd;
-
-        assert_return(m, -EINVAL);
-
-        fd = fcntl(m->fd, F_DUPFD_CLOEXEC, 3);
-        if (fd < 0)
-                return -errno;
-
-        return fd;
-}
-
-_public_ int sd_memfd_map(sd_memfd *m, uint64_t offset, size_t size, void **p) {
-        void *q;
-        int sealed;
-
-        assert_return(m, -EINVAL);
-        assert_return(size > 0, -EINVAL);
-        assert_return(p, -EINVAL);
-
-        sealed = sd_memfd_get_sealed(m);
-        if (sealed < 0)
-                return sealed;
-
-        q = mmap(NULL, size, sealed ? PROT_READ : PROT_READ|PROT_WRITE, MAP_PRIVATE, m->fd, offset);
-        if (q == MAP_FAILED)
-                return -errno;
-
-        *p = q;
-        return 0;
-}
-
-_public_ int sd_memfd_set_sealed(sd_memfd *m) {
-        int r;
-
-        assert_return(m, -EINVAL);
-
-        r = fcntl(m->fd, F_ADD_SEALS, F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
-        if (r < 0)
-                return -errno;
-
-        return 0;
-}
-
-_public_ int sd_memfd_get_sealed(sd_memfd *m) {
-        int r;
-
-        assert_return(m, -EINVAL);
-
-        r = fcntl(m->fd, F_GET_SEALS);
-        if (r < 0)
-                return -errno;
-
-        return (r & (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE)) ==
-                    (F_SEAL_SHRINK | F_SEAL_GROW | F_SEAL_WRITE);
-}
-
-_public_ int sd_memfd_get_size(sd_memfd *m, uint64_t *sz) {
-        int r;
-        struct stat stat;
-
-        assert_return(m, -EINVAL);
-        assert_return(sz, -EINVAL);
-
-        r = fstat(m->fd, &stat);
-        if (r < 0)
-                return -errno;
-
-        *sz = stat.st_size;
-        return r;
-}
-
-_public_ int sd_memfd_set_size(sd_memfd *m, uint64_t sz) {
-        int r;
-
-        assert_return(m, -EINVAL);
-
-        r = ftruncate(m->fd, sz);
-        if (r < 0)
-                return -errno;
-
-        return r;
-}
-
-_public_ int sd_memfd_new_and_map(sd_memfd **m, const char *name, size_t sz, void **p) {
-        sd_memfd *n;
-        int r;
-
-        r = sd_memfd_new(&n, name);
-        if (r < 0)
-                return r;
-
-        r = sd_memfd_set_size(n, sz);
-        if (r < 0) {
-                sd_memfd_free(n);
-                return r;
-        }
-
-        r = sd_memfd_map(n, 0, sz, p);
-        if (r < 0) {
-                sd_memfd_free(n);
-                return r;
-        }
-
-        *m = n;
-        return 0;
-}
-
-_public_ int sd_memfd_get_name(sd_memfd *m, char **name) {
-        char path[sizeof("/proc/self/fd/") + DECIMAL_STR_MAX(int)], buf[FILENAME_MAX+1], *e;
-        const char *delim, *end;
-        _cleanup_free_ char *n = NULL;
-        ssize_t k;
-
-        assert_return(m, -EINVAL);
-        assert_return(name, -EINVAL);
-
-        sprintf(path, "/proc/self/fd/%i", m->fd);
-
-        k = readlink(path, buf, sizeof(buf));
-        if (k < 0)
-                return -errno;
-
-        if ((size_t) k >= sizeof(buf))
-                return -E2BIG;
-
-        buf[k] = 0;
-
-        delim = strstr(buf, ":[");
-        if (!delim)
-                return -EIO;
-
-        delim = strchr(delim + 2, ':');
-        if (!delim)
-                return -EIO;
-
-        delim++;
-
-        end = strchr(delim, ']');
-        if (!end)
-                return -EIO;
-
-        n = strndup(delim, end - delim);
-        if (!n)
-                return -ENOMEM;
-
-        e = bus_label_unescape(n);
-        if (!e)
-                return -ENOMEM;
-
-        *name = e;
-
-        return 0;
-}
diff --git a/src/libsystemd/sd-bus/test-bus-zero-copy.c b/src/libsystemd/sd-bus/test-bus-zero-copy.c
index 29e40aa0af..e4a87ab3c5 100644
--- a/src/libsystemd/sd-bus/test-bus-zero-copy.c
+++ b/src/libsystemd/sd-bus/test-bus-zero-copy.c
@@ -24,9 +24,9 @@
 
 #include "util.h"
 #include "log.h"
+#include "memfd.h"
 
 #include "sd-bus.h"
-#include "sd-memfd.h"
 #include "bus-message.h"
 #include "bus-error.h"
 #include "bus-kernel.h"