New upstream version 1.32.12 upstream/1.32.12

1 files changed, 0 insertions, 1071 deletions

diff --git a/shared/systemd/src/basic/fd-util.c b/shared/systemd/src/basic/fd-util.c
deleted file mode 100644
index e53cf18d..00000000
--- a/shared/systemd/src/basic/fd-util.c
+++ /dev/null
@@ -1,1071 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-
-#include "nm-sd-adapt-shared.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/resource.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "alloc-util.h"
-#include "copy.h"
-#include "dirent-util.h"
-#include "fd-util.h"
-#include "fileio.h"
-#include "fs-util.h"
-#include "io-util.h"
-#include "macro.h"
-#include "memfd-util.h"
-#include "missing_fcntl.h"
-#include "missing_syscall.h"
-#include "parse-util.h"
-#include "path-util.h"
-#include "process-util.h"
-#include "socket-util.h"
-#include "sort-util.h"
-#include "stat-util.h"
-#include "stdio-util.h"
-#include "tmpfile-util.h"
-#include "util.h"
-
-/* The maximum number of iterations in the loop to close descriptors in the fallback case
- * when /proc/self/fd/ is inaccessible. */
-#define MAX_FD_LOOP_LIMIT (1024*1024)
-
-int close_nointr(int fd) {
-        assert(fd >= 0);
-
-        if (close(fd) >= 0)
-                return 0;
-
-        /*
-         * Just ignore EINTR; a retry loop is the wrong thing to do on
-         * Linux.
-         *
-         * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
-         * https://bugzilla.gnome.org/show_bug.cgi?id=682819
-         * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
-         * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
-         */
-        if (errno == EINTR)
-                return 0;
-
-        return -errno;
-}
-
-int safe_close(int fd) {
-
-        /*
-         * Like close_nointr() but cannot fail. Guarantees errno is
-         * unchanged. Is a NOP with negative fds passed, and returns
-         * -1, so that it can be used in this syntax:
-         *
-         * fd = safe_close(fd);
-         */
-
-        if (fd >= 0) {
-                PROTECT_ERRNO;
-
-                /* The kernel might return pretty much any error code
-                 * via close(), but the fd will be closed anyway. The
-                 * only condition we want to check for here is whether
-                 * the fd was invalid at all... */
-
-                assert_se(close_nointr(fd) != -EBADF);
-        }
-
-        return -1;
-}
-
-void safe_close_pair(int p[static 2]) {
-        assert(p);
-
-        if (p[0] == p[1]) {
-                /* Special case pairs which use the same fd in both
-                 * directions... */
-                p[0] = p[1] = safe_close(p[0]);
-                return;
-        }
-
-        p[0] = safe_close(p[0]);
-        p[1] = safe_close(p[1]);
-}
-
-void close_many(const int fds[], size_t n_fd) {
-        size_t i;
-
-        assert(fds || n_fd <= 0);
-
-        for (i = 0; i < n_fd; i++)
-                safe_close(fds[i]);
-}
-
-int fclose_nointr(FILE *f) {
-        assert(f);
-
-        /* Same as close_nointr(), but for fclose() */
-
-        errno = 0; /* Extra safety: if the FILE* object is not encapsulating an fd, it might not set errno
-                    * correctly. Let's hence initialize it to zero first, so that we aren't confused by any
-                    * prior errno here */
-        if (fclose(f) == 0)
-                return 0;
-
-        if (errno == EINTR)
-                return 0;
-
-        return errno_or_else(EIO);
-}
-
-FILE* safe_fclose(FILE *f) {
-
-        /* Same as safe_close(), but for fclose() */
-
-        if (f) {
-                PROTECT_ERRNO;
-
-                assert_se(fclose_nointr(f) != -EBADF);
-        }
-
-        return NULL;
-}
-
-DIR* safe_closedir(DIR *d) {
-
-        if (d) {
-                PROTECT_ERRNO;
-
-                assert_se(closedir(d) >= 0 || errno != EBADF);
-        }
-
-        return NULL;
-}
-
-int fd_nonblock(int fd, bool nonblock) {
-        int flags, nflags;
-
-        assert(fd >= 0);
-
-        flags = fcntl(fd, F_GETFL, 0);
-        if (flags < 0)
-                return -errno;
-
-        nflags = UPDATE_FLAG(flags, O_NONBLOCK, nonblock);
-        if (nflags == flags)
-                return 0;
-
-        if (fcntl(fd, F_SETFL, nflags) < 0)
-                return -errno;
-
-        return 0;
-}
-
-int fd_cloexec(int fd, bool cloexec) {
-        int flags, nflags;
-
-        assert(fd >= 0);
-
-        flags = fcntl(fd, F_GETFD, 0);
-        if (flags < 0)
-                return -errno;
-
-        nflags = UPDATE_FLAG(flags, FD_CLOEXEC, cloexec);
-        if (nflags == flags)
-                return 0;
-
-        if (fcntl(fd, F_SETFD, nflags) < 0)
-                return -errno;
-
-        return 0;
-}
-
-#if 0 /* NM_IGNORED */
-_pure_ static bool fd_in_set(int fd, const int fdset[], size_t n_fdset) {
-        size_t i;
-
-        assert(n_fdset == 0 || fdset);
-
-        for (i = 0; i < n_fdset; i++)
-                if (fdset[i] == fd)
-                        return true;
-
-        return false;
-}
-
-static int get_max_fd(void) {
-        struct rlimit rl;
-        rlim_t m;
-
-        /* Return the highest possible fd, based RLIMIT_NOFILE, but enforcing FD_SETSIZE-1 as lower boundary
-         * and INT_MAX as upper boundary. */
-
-        if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
-                return -errno;
-
-        m = MAX(rl.rlim_cur, rl.rlim_max);
-        if (m < FD_SETSIZE) /* Let's always cover at least 1024 fds */
-                return FD_SETSIZE-1;
-
-        if (m == RLIM_INFINITY || m > INT_MAX) /* Saturate on overflow. After all fds are "int", hence can
-                                                * never be above INT_MAX */
-                return INT_MAX;
-
-        return (int) (m - 1);
-}
-
-int close_all_fds(const int except[], size_t n_except) {
-        static bool have_close_range = true; /* Assume we live in the future */
-        _cleanup_closedir_ DIR *d = NULL;
-        struct dirent *de;
-        int r = 0;
-
-        assert(n_except == 0 || except);
-
-        if (have_close_range) {
-                /* In the best case we have close_range() to close all fds between a start and an end fd,
-                 * which we can use on the "inverted" exception array, i.e. all intervals between all
-                 * adjacent pairs from the sorted exception array. This changes loop complexity from O(n)
-                 * where n is number of open fds to O(m⋅log(m)) where m is the number of fds to keep
-                 * open. Given that we assume n ≫ m that's preferable to us. */
-
-                if (n_except == 0) {
-                        /* Close everything. Yay! */
-
-                        if (close_range(3, -1, 0) >= 0)
-                                return 1;
-
-                        if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno))
-                                return -errno;
-
-                        have_close_range = false;
-                } else {
-                        _cleanup_free_ int *sorted_malloc = NULL;
-                        size_t n_sorted;
-                        int *sorted;
-
-                        assert(n_except < SIZE_MAX);
-                        n_sorted = n_except + 1;
-
-                        if (n_sorted > 64) /* Use heap for large numbers of fds, stack otherwise */
-                                sorted = sorted_malloc = new(int, n_sorted);
-                        else
-                                sorted = newa(int, n_sorted);
-
-                        if (sorted) {
-                                int c = 0;
-
-                                memcpy(sorted, except, n_except * sizeof(int));
-
-                                /* Let's add fd 2 to the list of fds, to simplify the loop below, as this
-                                 * allows us to cover the head of the array the same way as the body */
-                                sorted[n_sorted-1] = 2;
-
-                                typesafe_qsort(sorted, n_sorted, cmp_int);
-
-                                for (size_t i = 0; i < n_sorted-1; i++) {
-                                        int start, end;
-
-                                        start = MAX(sorted[i], 2); /* The first three fds shall always remain open */
-                                        end = MAX(sorted[i+1], 2);
-
-                                        assert(end >= start);
-
-                                        if (end - start <= 1)
-                                                continue;
-
-                                        /* Close everything between the start and end fds (both of which shall stay open) */
-                                        if (close_range(start + 1, end - 1, 0) < 0) {
-                                                if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno))
-                                                        return -errno;
-
-                                                have_close_range = false;
-                                                break;
-                                        }
-
-                                        c += end - start - 1;
-                                }
-
-                                if (have_close_range) {
-                                        /* The loop succeeded. Let's now close everything beyond the end */
-
-                                        if (sorted[n_sorted-1] >= INT_MAX) /* Dont let the addition below overflow */
-                                                return c;
-
-                                        if (close_range(sorted[n_sorted-1] + 1, -1, 0) >= 0)
-                                                return c + 1;
-
-                                        if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno))
-                                                return -errno;
-
-                                        have_close_range = false;
-                                }
-                        }
-                }
-
-                /* Fallback on OOM or if close_range() is not supported */
-        }
-
-        d = opendir("/proc/self/fd");
-        if (!d) {
-                int fd, max_fd;
-
-                /* When /proc isn't available (for example in chroots) the fallback is brute forcing through
-                 * the fd table */
-
-                max_fd = get_max_fd();
-                if (max_fd < 0)
-                        return max_fd;
-
-                /* Refuse to do the loop over more too many elements. It's better to fail immediately than to
-                 * spin the CPU for a long time. */
-                if (max_fd > MAX_FD_LOOP_LIMIT)
-                        return log_debug_errno(SYNTHETIC_ERRNO(EPERM),
-                                               "/proc/self/fd is inaccessible. Refusing to loop over %d potential fds.",
-                                               max_fd);
-
-                for (fd = 3; fd >= 0; fd = fd < max_fd ? fd + 1 : -1) {
-                        int q;
-
-                        if (fd_in_set(fd, except, n_except))
-                                continue;
-
-                        q = close_nointr(fd);
-                        if (q < 0 && q != -EBADF && r >= 0)
-                                r = q;
-                }
-
-                return r;
-        }
-
-        FOREACH_DIRENT(de, d, return -errno) {
-                int fd = -1, q;
-
-                if (safe_atoi(de->d_name, &fd) < 0)
-                        /* Let's better ignore this, just in case */
-                        continue;
-
-                if (fd < 3)
-                        continue;
-
-                if (fd == dirfd(d))
-                        continue;
-
-                if (fd_in_set(fd, except, n_except))
-                        continue;
-
-                q = close_nointr(fd);
-                if (q < 0 && q != -EBADF && r >= 0) /* Valgrind has its own FD and doesn't want to have it closed */
-                        r = q;
-        }
-
-        return r;
-}
-
-int same_fd(int a, int b) {
-        struct stat sta, stb;
-        pid_t pid;
-        int r, fa, fb;
-
-        assert(a >= 0);
-        assert(b >= 0);
-
-        /* Compares two file descriptors. Note that semantics are
-         * quite different depending on whether we have kcmp() or we
-         * don't. If we have kcmp() this will only return true for
-         * dup()ed file descriptors, but not otherwise. If we don't
-         * have kcmp() this will also return true for two fds of the same
-         * file, created by separate open() calls. Since we use this
-         * call mostly for filtering out duplicates in the fd store
-         * this difference hopefully doesn't matter too much. */
-
-        if (a == b)
-                return true;
-
-        /* Try to use kcmp() if we have it. */
-        pid = getpid_cached();
-        r = kcmp(pid, pid, KCMP_FILE, a, b);
-        if (r == 0)
-                return true;
-        if (r > 0)
-                return false;
-        if (!IN_SET(errno, ENOSYS, EACCES, EPERM))
-                return -errno;
-
-        /* We don't have kcmp(), use fstat() instead. */
-        if (fstat(a, &sta) < 0)
-                return -errno;
-
-        if (fstat(b, &stb) < 0)
-                return -errno;
-
-        if ((sta.st_mode & S_IFMT) != (stb.st_mode & S_IFMT))
-                return false;
-
-        /* We consider all device fds different, since two device fds
-         * might refer to quite different device contexts even though
-         * they share the same inode and backing dev_t. */
-
-        if (S_ISCHR(sta.st_mode) || S_ISBLK(sta.st_mode))
-                return false;
-
-        if (sta.st_dev != stb.st_dev || sta.st_ino != stb.st_ino)
-                return false;
-
-        /* The fds refer to the same inode on disk, let's also check
-         * if they have the same fd flags. This is useful to
-         * distinguish the read and write side of a pipe created with
-         * pipe(). */
-        fa = fcntl(a, F_GETFL);
-        if (fa < 0)
-                return -errno;
-
-        fb = fcntl(b, F_GETFL);
-        if (fb < 0)
-                return -errno;
-
-        return fa == fb;
-}
-#endif /* NM_IGNORED */
-
-void cmsg_close_all(struct msghdr *mh) {
-        struct cmsghdr *cmsg;
-
-        assert(mh);
-
-        CMSG_FOREACH(cmsg, mh)
-                if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
-                        close_many((int*) CMSG_DATA(cmsg), (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int));
-}
-
-bool fdname_is_valid(const char *s) {
-        const char *p;
-
-        /* Validates a name for $LISTEN_FDNAMES. We basically allow
-         * everything ASCII that's not a control character. Also, as
-         * special exception the ":" character is not allowed, as we
-         * use that as field separator in $LISTEN_FDNAMES.
-         *
-         * Note that the empty string is explicitly allowed
-         * here. However, we limit the length of the names to 255
-         * characters. */
-
-        if (!s)
-                return false;
-
-        for (p = s; *p; p++) {
-                if (*p < ' ')
-                        return false;
-                if (*p >= 127)
-                        return false;
-                if (*p == ':')
-                        return false;
-        }
-
-        return p - s < 256;
-}
-
-#if 0 /* NM_IGNORED */
-int fd_get_path(int fd, char **ret) {
-        char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
-        int r;
-
-        xsprintf(procfs_path, "/proc/self/fd/%i", fd);
-        r = readlink_malloc(procfs_path, ret);
-        if (r == -ENOENT) {
-                /* ENOENT can mean two things: that the fd does not exist or that /proc is not mounted. Let's make
-                 * things debuggable and distinguish the two. */
-
-                if (proc_mounted() == 0)
-                        return -ENOSYS;  /* /proc is not available or not set up properly, we're most likely in some chroot
-                                          * environment. */
-                return -EBADF; /* The directory exists, hence it's the fd that doesn't. */
-        }
-
-        return r;
-}
-
-int move_fd(int from, int to, int cloexec) {
-        int r;
-
-        /* Move fd 'from' to 'to', make sure FD_CLOEXEC remains equal if requested, and release the old fd. If
-         * 'cloexec' is passed as -1, the original FD_CLOEXEC is inherited for the new fd. If it is 0, it is turned
-         * off, if it is > 0 it is turned on. */
-
-        if (from < 0)
-                return -EBADF;
-        if (to < 0)
-                return -EBADF;
-
-        if (from == to) {
-
-                if (cloexec >= 0) {
-                        r = fd_cloexec(to, cloexec);
-                        if (r < 0)
-                                return r;
-                }
-
-                return to;
-        }
-
-        if (cloexec < 0) {
-                int fl;
-
-                fl = fcntl(from, F_GETFD, 0);
-                if (fl < 0)
-                        return -errno;
-
-                cloexec = !!(fl & FD_CLOEXEC);
-        }
-
-        r = dup3(from, to, cloexec ? O_CLOEXEC : 0);
-        if (r < 0)
-                return -errno;
-
-        assert(r == to);
-
-        safe_close(from);
-
-        return to;
-}
-
-int acquire_data_fd(const void *data, size_t size, unsigned flags) {
-
-        _cleanup_close_pair_ int pipefds[2] = { -1, -1 };
-        char pattern[] = "/dev/shm/data-fd-XXXXXX";
-        _cleanup_close_ int fd = -1;
-        int isz = 0, r;
-        ssize_t n;
-        off_t f;
-
-        assert(data || size == 0);
-
-        /* Acquire a read-only file descriptor that when read from returns the specified data. This is much more
-         * complex than I wish it was. But here's why:
-         *
-         * a) First we try to use memfds. They are the best option, as we can seal them nicely to make them
-         *    read-only. Unfortunately they require kernel 3.17, and – at the time of writing – we still support 3.14.
-         *
-         * b) Then, we try classic pipes. They are the second best options, as we can close the writing side, retaining
-         *    a nicely read-only fd in the reading side. However, they are by default quite small, and unprivileged
-         *    clients can only bump their size to a system-wide limit, which might be quite low.
-         *
-         * c) Then, we try an O_TMPFILE file in /dev/shm (that dir is the only suitable one known to exist from
-         *    earliest boot on). To make it read-only we open the fd a second time with O_RDONLY via
-         *    /proc/self/<fd>. Unfortunately O_TMPFILE is not available on older kernels on tmpfs.
-         *
-         * d) Finally, we try creating a regular file in /dev/shm, which we then delete.
-         *
-         * It sucks a bit that depending on the situation we return very different objects here, but that's Linux I
-         * figure. */
-
-        if (size == 0 && ((flags & ACQUIRE_NO_DEV_NULL) == 0)) {
-                /* As a special case, return /dev/null if we have been called for an empty data block */
-                r = open("/dev/null", O_RDONLY|O_CLOEXEC|O_NOCTTY);
-                if (r < 0)
-                        return -errno;
-
-                return r;
-        }
-
-        if ((flags & ACQUIRE_NO_MEMFD) == 0) {
-                fd = memfd_new("data-fd");
-                if (fd < 0)
-                        goto try_pipe;
-
-                n = write(fd, data, size);
-                if (n < 0)
-                        return -errno;
-                if ((size_t) n != size)
-                        return -EIO;
-
-                f = lseek(fd, 0, SEEK_SET);
-                if (f != 0)
-                        return -errno;
-
-                r = memfd_set_sealed(fd);
-                if (r < 0)
-                        return r;
-
-                return TAKE_FD(fd);
-        }
-
-try_pipe:
-        if ((flags & ACQUIRE_NO_PIPE) == 0) {
-                if (pipe2(pipefds, O_CLOEXEC|O_NONBLOCK) < 0)
-                        return -errno;
-
-                isz = fcntl(pipefds[1], F_GETPIPE_SZ, 0);
-                if (isz < 0)
-                        return -errno;
-
-                if ((size_t) isz < size) {
-                        isz = (int) size;
-                        if (isz < 0 || (size_t) isz != size)
-                                return -E2BIG;
-
-                        /* Try to bump the pipe size */
-                        (void) fcntl(pipefds[1], F_SETPIPE_SZ, isz);
-
-                        /* See if that worked */
-                        isz = fcntl(pipefds[1], F_GETPIPE_SZ, 0);
-                        if (isz < 0)
-                                return -errno;
-
-                        if ((size_t) isz < size)
-                                goto try_dev_shm;
-                }
-
-                n = write(pipefds[1], data, size);
-                if (n < 0)
-                        return -errno;
-                if ((size_t) n != size)
-                        return -EIO;
-
-                (void) fd_nonblock(pipefds[0], false);
-
-                return TAKE_FD(pipefds[0]);
-        }
-
-try_dev_shm:
-        if ((flags & ACQUIRE_NO_TMPFILE) == 0) {
-                fd = open("/dev/shm", O_RDWR|O_TMPFILE|O_CLOEXEC, 0500);
-                if (fd < 0)
-                        goto try_dev_shm_without_o_tmpfile;
-
-                n = write(fd, data, size);
-                if (n < 0)
-                        return -errno;
-                if ((size_t) n != size)
-                        return -EIO;
-
-                /* Let's reopen the thing, in order to get an O_RDONLY fd for the original O_RDWR one */
-                return fd_reopen(fd, O_RDONLY|O_CLOEXEC);
-        }
-
-try_dev_shm_without_o_tmpfile:
-        if ((flags & ACQUIRE_NO_REGULAR) == 0) {
-                fd = mkostemp_safe(pattern);
-                if (fd < 0)
-                        return fd;
-
-                n = write(fd, data, size);
-                if (n < 0) {
-                        r = -errno;
-                        goto unlink_and_return;
-                }
-                if ((size_t) n != size) {
-                        r = -EIO;
-                        goto unlink_and_return;
-                }
-
-                /* Let's reopen the thing, in order to get an O_RDONLY fd for the original O_RDWR one */
-                r = open(pattern, O_RDONLY|O_CLOEXEC);
-                if (r < 0)
-                        r = -errno;
-
-        unlink_and_return:
-                (void) unlink(pattern);
-                return r;
-        }
-
-        return -EOPNOTSUPP;
-}
-
-/* When the data is smaller or equal to 64K, try to place the copy in a memfd/pipe */
-#define DATA_FD_MEMORY_LIMIT (64U*1024U)
-
-/* If memfd/pipe didn't work out, then let's use a file in /tmp up to a size of 1M. If it's large than that use /var/tmp instead. */
-#define DATA_FD_TMP_LIMIT (1024U*1024U)
-
-int fd_duplicate_data_fd(int fd) {
-
-        _cleanup_close_ int copy_fd = -1, tmp_fd = -1;
-        _cleanup_free_ void *remains = NULL;
-        size_t remains_size = 0;
-        const char *td;
-        struct stat st;
-        int r;
-
-        /* Creates a 'data' fd from the specified source fd, containing all the same data in a read-only fashion, but
-         * independent of it (i.e. the source fd can be closed and unmounted after this call succeeded). Tries to be
-         * somewhat smart about where to place the data. In the best case uses a memfd(). If memfd() are not supported
-         * uses a pipe instead. For larger data will use an unlinked file in /tmp, and for even larger data one in
-         * /var/tmp. */
-
-        if (fstat(fd, &st) < 0)
-                return -errno;
-
-        /* For now, let's only accept regular files, sockets, pipes and char devices */
-        if (S_ISDIR(st.st_mode))
-                return -EISDIR;
-        if (S_ISLNK(st.st_mode))
-                return -ELOOP;
-        if (!S_ISREG(st.st_mode) && !S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode) && !S_ISCHR(st.st_mode))
-                return -EBADFD;
-
-        /* If we have reason to believe the data is bounded in size, then let's use memfds or pipes as backing fd. Note
-         * that we use the reported regular file size only as a hint, given that there are plenty special files in
-         * /proc and /sys which report a zero file size but can be read from. */
-
-        if (!S_ISREG(st.st_mode) || st.st_size < DATA_FD_MEMORY_LIMIT) {
-
-                /* Try a memfd first */
-                copy_fd = memfd_new("data-fd");
-                if (copy_fd >= 0) {
-                        off_t f;
-
-                        r = copy_bytes(fd, copy_fd, DATA_FD_MEMORY_LIMIT, 0);
-                        if (r < 0)
-                                return r;
-
-                        f = lseek(copy_fd, 0, SEEK_SET);
-                        if (f != 0)
-                                return -errno;
-
-                        if (r == 0) {
-                                /* Did it fit into the limit? If so, we are done. */
-                                r = memfd_set_sealed(copy_fd);
-                                if (r < 0)
-                                        return r;
-
-                                return TAKE_FD(copy_fd);
-                        }
-
-                        /* Hmm, pity, this didn't fit. Let's fall back to /tmp then, see below */
-
-                } else {
-                        _cleanup_(close_pairp) int pipefds[2] = { -1, -1 };
-                        int isz;
-
-                        /* If memfds aren't available, use a pipe. Set O_NONBLOCK so that we will get EAGAIN rather
-                         * then block indefinitely when we hit the pipe size limit */
-
-                        if (pipe2(pipefds, O_CLOEXEC|O_NONBLOCK) < 0)
-                                return -errno;
-
-                        isz = fcntl(pipefds[1], F_GETPIPE_SZ, 0);
-                        if (isz < 0)
-                                return -errno;
-
-                        /* Try to enlarge the pipe size if necessary */
-                        if ((size_t) isz < DATA_FD_MEMORY_LIMIT) {
-
-                                (void) fcntl(pipefds[1], F_SETPIPE_SZ, DATA_FD_MEMORY_LIMIT);
-
-                                isz = fcntl(pipefds[1], F_GETPIPE_SZ, 0);
-                                if (isz < 0)
-                                        return -errno;
-                        }
-
-                        if ((size_t) isz >= DATA_FD_MEMORY_LIMIT) {
-
-                                r = copy_bytes_full(fd, pipefds[1], DATA_FD_MEMORY_LIMIT, 0, &remains, &remains_size, NULL, NULL);
-                                if (r < 0 && r != -EAGAIN)
-                                        return r; /* If we get EAGAIN it could be because of the source or because of
-                                                   * the destination fd, we can't know, as sendfile() and friends won't
-                                                   * tell us. Hence, treat this as reason to fall back, just to be
-                                                   * sure. */
-                                if (r == 0) {
-                                        /* Everything fit in, yay! */
-                                        (void) fd_nonblock(pipefds[0], false);
-
-                                        return TAKE_FD(pipefds[0]);
-                                }
-
-                                /* Things didn't fit in. But we read data into the pipe, let's remember that, so that
-                                 * when writing the new file we incorporate this first. */
-                                copy_fd = TAKE_FD(pipefds[0]);
-                        }
-                }
-        }
-
-        /* If we have reason to believe this will fit fine in /tmp, then use that as first fallback. */
-        if ((!S_ISREG(st.st_mode) || st.st_size < DATA_FD_TMP_LIMIT) &&
-            (DATA_FD_MEMORY_LIMIT + remains_size) < DATA_FD_TMP_LIMIT) {
-                off_t f;
-
-                tmp_fd = open_tmpfile_unlinkable(NULL /* NULL as directory means /tmp */, O_RDWR|O_CLOEXEC);
-                if (tmp_fd < 0)
-                        return tmp_fd;
-
-                if (copy_fd >= 0) {
-                        /* If we tried a memfd/pipe first and it ended up being too large, then copy this into the
-                         * temporary file first. */
-
-                        r = copy_bytes(copy_fd, tmp_fd, UINT64_MAX, 0);
-                        if (r < 0)
-                                return r;
-
-                        assert(r == 0);
-                }
-
-                if (remains_size > 0) {
-                        /* If there were remaining bytes (i.e. read into memory, but not written out yet) from the
-                         * failed copy operation, let's flush them out next. */
-
-                        r = loop_write(tmp_fd, remains, remains_size, false);
-                        if (r < 0)
-                                return r;
-                }
-
-                r = copy_bytes(fd, tmp_fd, DATA_FD_TMP_LIMIT - DATA_FD_MEMORY_LIMIT - remains_size, COPY_REFLINK);
-                if (r < 0)
-                        return r;
-                if (r == 0)
-                        goto finish;  /* Yay, it fit in */
-
-                /* It didn't fit in. Let's not forget to use what we already used */
-                f = lseek(tmp_fd, 0, SEEK_SET);
-                if (f != 0)
-                        return -errno;
-
-                CLOSE_AND_REPLACE(copy_fd, tmp_fd);
-
-                remains = mfree(remains);
-                remains_size = 0;
-        }
-
-        /* As last fallback use /var/tmp */
-        r = var_tmp_dir(&td);
-        if (r < 0)
-                return r;
-
-        tmp_fd = open_tmpfile_unlinkable(td, O_RDWR|O_CLOEXEC);
-        if (tmp_fd < 0)
-                return tmp_fd;
-
-        if (copy_fd >= 0) {
-                /* If we tried a memfd/pipe first, or a file in /tmp, and it ended up being too large, than copy this
-                 * into the temporary file first. */
-                r = copy_bytes(copy_fd, tmp_fd, UINT64_MAX, COPY_REFLINK);
-                if (r < 0)
-                        return r;
-
-                assert(r == 0);
-        }
-
-        if (remains_size > 0) {
-                /* Then, copy in any read but not yet written bytes. */
-                r = loop_write(tmp_fd, remains, remains_size, false);
-                if (r < 0)
-                        return r;
-        }
-
-        /* Copy in the rest */
-        r = copy_bytes(fd, tmp_fd, UINT64_MAX, COPY_REFLINK);
-        if (r < 0)
-                return r;
-
-        assert(r == 0);
-
-finish:
-        /* Now convert the O_RDWR file descriptor into an O_RDONLY one (and as side effect seek to the beginning of the
-         * file again */
-
-        return fd_reopen(tmp_fd, O_RDONLY|O_CLOEXEC);
-}
-#endif /* NM_IGNORED */
-
-int fd_move_above_stdio(int fd) {
-        int flags, copy;
-        PROTECT_ERRNO;
-
-        /* Moves the specified file descriptor if possible out of the range [0…2], i.e. the range of
-         * stdin/stdout/stderr. If it can't be moved outside of this range the original file descriptor is
-         * returned. This call is supposed to be used for long-lasting file descriptors we allocate in our code that
-         * might get loaded into foreign code, and where we want ensure our fds are unlikely used accidentally as
-         * stdin/stdout/stderr of unrelated code.
-         *
-         * Note that this doesn't fix any real bugs, it just makes it less likely that our code will be affected by
-         * buggy code from others that mindlessly invokes 'fprintf(stderr, …' or similar in places where stderr has
-         * been closed before.
-         *
-         * This function is written in a "best-effort" and "least-impact" style. This means whenever we encounter an
-         * error we simply return the original file descriptor, and we do not touch errno. */
-
-        if (fd < 0 || fd > 2)
-                return fd;
-
-        flags = fcntl(fd, F_GETFD, 0);
-        if (flags < 0)
-                return fd;
-
-        if (flags & FD_CLOEXEC)
-                copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
-        else
-                copy = fcntl(fd, F_DUPFD, 3);
-        if (copy < 0)
-                return fd;
-
-        assert(copy > 2);
-
-        (void) close(fd);
-        return copy;
-}
-
-#if 0 /* NM_IGNORED */
-int rearrange_stdio(int original_input_fd, int original_output_fd, int original_error_fd) {
-
-        int fd[3] = { /* Put together an array of fds we work on */
-                original_input_fd,
-                original_output_fd,
-                original_error_fd
-        };
-
-        int r, i,
-                null_fd = -1,                /* if we open /dev/null, we store the fd to it here */
-                copy_fd[3] = { -1, -1, -1 }; /* This contains all fds we duplicate here temporarily, and hence need to close at the end */
-        bool null_readable, null_writable;
-
-        /* Sets up stdin, stdout, stderr with the three file descriptors passed in. If any of the descriptors is
-         * specified as -1 it will be connected with /dev/null instead. If any of the file descriptors is passed as
-         * itself (e.g. stdin as STDIN_FILENO) it is left unmodified, but the O_CLOEXEC bit is turned off should it be
-         * on.
-         *
-         * Note that if any of the passed file descriptors are > 2 they will be closed — both on success and on
-         * failure! Thus, callers should assume that when this function returns the input fds are invalidated.
-         *
-         * Note that when this function fails stdin/stdout/stderr might remain half set up!
-         *
-         * O_CLOEXEC is turned off for all three file descriptors (which is how it should be for
-         * stdin/stdout/stderr). */
-
-        null_readable = original_input_fd < 0;
-        null_writable = original_output_fd < 0 || original_error_fd < 0;
-
-        /* First step, open /dev/null once, if we need it */
-        if (null_readable || null_writable) {
-
-                /* Let's open this with O_CLOEXEC first, and convert it to non-O_CLOEXEC when we move the fd to the final position. */
-                null_fd = open("/dev/null", (null_readable && null_writable ? O_RDWR :
-                                             null_readable ? O_RDONLY : O_WRONLY) | O_CLOEXEC);
-                if (null_fd < 0) {
-                        r = -errno;
-                        goto finish;
-                }
-
-                /* If this fd is in the 0…2 range, let's move it out of it */
-                if (null_fd < 3) {
-                        int copy;
-
-                        copy = fcntl(null_fd, F_DUPFD_CLOEXEC, 3); /* Duplicate this with O_CLOEXEC set */
-                        if (copy < 0) {
-                                r = -errno;
-                                goto finish;
-                        }
-
-                        CLOSE_AND_REPLACE(null_fd, copy);
-                }
-        }
-
-        /* Let's assemble fd[] with the fds to install in place of stdin/stdout/stderr */
-        for (i = 0; i < 3; i++) {
-
-                if (fd[i] < 0)
-                        fd[i] = null_fd;        /* A negative parameter means: connect this one to /dev/null */
-                else if (fd[i] != i && fd[i] < 3) {
-                        /* This fd is in the 0…2 territory, but not at its intended place, move it out of there, so that we can work there. */
-                        copy_fd[i] = fcntl(fd[i], F_DUPFD_CLOEXEC, 3); /* Duplicate this with O_CLOEXEC set */
-                        if (copy_fd[i] < 0) {
-                                r = -errno;
-                                goto finish;
-                        }
-
-                        fd[i] = copy_fd[i];
-                }
-        }
-
-        /* At this point we now have the fds to use in fd[], and they are all above the stdio range, so that we
-         * have freedom to move them around. If the fds already were at the right places then the specific fds are
-         * -1. Let's now move them to the right places. This is the point of no return. */
-        for (i = 0; i < 3; i++) {
-
-                if (fd[i] == i) {
-
-                        /* fd is already in place, but let's make sure O_CLOEXEC is off */
-                        r = fd_cloexec(i, false);
-                        if (r < 0)
-                                goto finish;
-
-                } else {
-                        assert(fd[i] > 2);
-
-                        if (dup2(fd[i], i) < 0) { /* Turns off O_CLOEXEC on the new fd. */
-                                r = -errno;
-                                goto finish;
-                        }
-                }
-        }
-
-        r = 0;
-
-finish:
-        /* Close the original fds, but only if they were outside of the stdio range. Also, properly check for the same
-         * fd passed in multiple times. */
-        safe_close_above_stdio(original_input_fd);
-        if (original_output_fd != original_input_fd)
-                safe_close_above_stdio(original_output_fd);
-        if (original_error_fd != original_input_fd && original_error_fd != original_output_fd)
-                safe_close_above_stdio(original_error_fd);
-
-        /* Close the copies we moved > 2 */
-        for (i = 0; i < 3; i++)
-                safe_close(copy_fd[i]);
-
-        /* Close our null fd, if it's > 2 */
-        safe_close_above_stdio(null_fd);
-
-        return r;
-}
-
-int fd_reopen(int fd, int flags) {
-        char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
-        int new_fd;
-
-        /* Reopens the specified fd with new flags. This is useful for convert an O_PATH fd into a regular one, or to
-         * turn O_RDWR fds into O_RDONLY fds.
-         *
-         * This doesn't work on sockets (since they cannot be open()ed, ever).
-         *
-         * This implicitly resets the file read index to 0. */
-
-        xsprintf(procfs_path, "/proc/self/fd/%i", fd);
-        new_fd = open(procfs_path, flags);
-        if (new_fd < 0) {
-                if (errno != ENOENT)
-                        return -errno;
-
-                if (proc_mounted() == 0)
-                        return -ENOSYS; /* if we have no /proc/, the concept is not implementable */
-
-                return -ENOENT;
-        }
-
-        return new_fd;
-}
-
-int read_nr_open(void) {
-        _cleanup_free_ char *nr_open = NULL;
-        int r;
-
-        /* Returns the kernel's current fd limit, either by reading it of /proc/sys if that works, or using the
-         * hard-coded default compiled-in value of current kernels (1M) if not. This call will never fail. */
-
-        r = read_one_line_file("/proc/sys/fs/nr_open", &nr_open);
-        if (r < 0)
-                log_debug_errno(r, "Failed to read /proc/sys/fs/nr_open, ignoring: %m");
-        else {
-                int v;
-
-                r = safe_atoi(nr_open, &v);
-                if (r < 0)
-                        log_debug_errno(r, "Failed to parse /proc/sys/fs/nr_open value '%s', ignoring: %m", nr_open);
-                else
-                        return v;
-        }
-
-        /* If we fail, fall back to the hard-coded kernel limit of 1024 * 1024. */
-        return 1024 * 1024;
-}
-#endif /* NM_IGNORED */