b326715278
Compare errno with zero in a way that tells gcc that (if the condition is true) errno is positive.
796 lines
22 KiB
C
796 lines
22 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 2010 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 <alloca.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include <sys/statfs.h>
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#include <sys/sysmacros.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "build.h"
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#include "def.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "formats-util.h"
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#include "hashmap.h"
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#include "hostname-util.h"
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#include "log.h"
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#include "macro.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "set.h"
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#include "signal-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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#include "user-util.h"
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#include "util.h"
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/* Put this test here for a lack of better place */
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assert_cc(EAGAIN == EWOULDBLOCK);
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int saved_argc = 0;
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char **saved_argv = NULL;
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size_t page_size(void) {
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static thread_local size_t pgsz = 0;
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long r;
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if (_likely_(pgsz > 0))
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return pgsz;
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r = sysconf(_SC_PAGESIZE);
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assert(r > 0);
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pgsz = (size_t) r;
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return pgsz;
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}
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static int do_execute(char **directories, usec_t timeout, char *argv[]) {
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_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
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_cleanup_set_free_free_ Set *seen = NULL;
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char **directory;
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/* We fork this all off from a child process so that we can
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* somewhat cleanly make use of SIGALRM to set a time limit */
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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pids = hashmap_new(NULL);
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if (!pids)
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return log_oom();
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seen = set_new(&string_hash_ops);
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if (!seen)
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return log_oom();
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STRV_FOREACH(directory, directories) {
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_cleanup_closedir_ DIR *d;
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struct dirent *de;
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d = opendir(*directory);
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if (!d) {
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if (errno == ENOENT)
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continue;
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return log_error_errno(errno, "Failed to open directory %s: %m", *directory);
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}
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FOREACH_DIRENT(de, d, break) {
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_cleanup_free_ char *path = NULL;
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pid_t pid;
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int r;
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if (!dirent_is_file(de))
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continue;
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if (set_contains(seen, de->d_name)) {
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log_debug("%1$s/%2$s skipped (%2$s was already seen).", *directory, de->d_name);
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continue;
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}
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r = set_put_strdup(seen, de->d_name);
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if (r < 0)
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return log_oom();
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path = strjoin(*directory, "/", de->d_name, NULL);
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if (!path)
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return log_oom();
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if (null_or_empty_path(path)) {
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log_debug("%s is empty (a mask).", path);
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continue;
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}
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pid = fork();
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if (pid < 0) {
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log_error_errno(errno, "Failed to fork: %m");
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continue;
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} else if (pid == 0) {
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char *_argv[2];
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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if (!argv) {
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_argv[0] = path;
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_argv[1] = NULL;
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argv = _argv;
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} else
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argv[0] = path;
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execv(path, argv);
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return log_error_errno(errno, "Failed to execute %s: %m", path);
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}
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log_debug("Spawned %s as " PID_FMT ".", path, pid);
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r = hashmap_put(pids, PID_TO_PTR(pid), path);
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if (r < 0)
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return log_oom();
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path = NULL;
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}
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}
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/* Abort execution of this process after the timout. We simply
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* rely on SIGALRM as default action terminating the process,
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* and turn on alarm(). */
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if (timeout != USEC_INFINITY)
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alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
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while (!hashmap_isempty(pids)) {
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_cleanup_free_ char *path = NULL;
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pid_t pid;
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pid = PTR_TO_PID(hashmap_first_key(pids));
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assert(pid > 0);
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path = hashmap_remove(pids, PID_TO_PTR(pid));
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assert(path);
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wait_for_terminate_and_warn(path, pid, true);
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}
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return 0;
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}
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void execute_directories(const char* const* directories, usec_t timeout, char *argv[]) {
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pid_t executor_pid;
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int r;
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char *name;
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char **dirs = (char**) directories;
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assert(!strv_isempty(dirs));
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name = basename(dirs[0]);
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assert(!isempty(name));
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/* Executes all binaries in the directories in parallel and waits
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* for them to finish. Optionally a timeout is applied. If a file
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* with the same name exists in more than one directory, the
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* earliest one wins. */
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executor_pid = fork();
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if (executor_pid < 0) {
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log_error_errno(errno, "Failed to fork: %m");
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return;
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} else if (executor_pid == 0) {
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r = do_execute(dirs, timeout, argv);
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_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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wait_for_terminate_and_warn(name, executor_pid, true);
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}
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bool plymouth_running(void) {
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return access("/run/plymouth/pid", F_OK) >= 0;
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}
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bool display_is_local(const char *display) {
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assert(display);
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return
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display[0] == ':' &&
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display[1] >= '0' &&
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display[1] <= '9';
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}
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int socket_from_display(const char *display, char **path) {
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size_t k;
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char *f, *c;
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assert(display);
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assert(path);
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if (!display_is_local(display))
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return -EINVAL;
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k = strspn(display+1, "0123456789");
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f = new(char, strlen("/tmp/.X11-unix/X") + k + 1);
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if (!f)
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return -ENOMEM;
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c = stpcpy(f, "/tmp/.X11-unix/X");
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memcpy(c, display+1, k);
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c[k] = 0;
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*path = f;
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return 0;
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}
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int block_get_whole_disk(dev_t d, dev_t *ret) {
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char *p, *s;
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int r;
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unsigned n, m;
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assert(ret);
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/* If it has a queue this is good enough for us */
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if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
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return -ENOMEM;
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r = access(p, F_OK);
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free(p);
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if (r >= 0) {
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*ret = d;
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return 0;
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}
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/* If it is a partition find the originating device */
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if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
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return -ENOMEM;
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r = access(p, F_OK);
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free(p);
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if (r < 0)
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return -ENOENT;
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/* Get parent dev_t */
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if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
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return -ENOMEM;
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r = read_one_line_file(p, &s);
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free(p);
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if (r < 0)
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return r;
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r = sscanf(s, "%u:%u", &m, &n);
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free(s);
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if (r != 2)
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return -EINVAL;
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/* Only return this if it is really good enough for us. */
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if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
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return -ENOMEM;
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r = access(p, F_OK);
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free(p);
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if (r >= 0) {
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*ret = makedev(m, n);
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return 0;
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}
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return -ENOENT;
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}
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bool kexec_loaded(void) {
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bool loaded = false;
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char *s;
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if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
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if (s[0] == '1')
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loaded = true;
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free(s);
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}
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return loaded;
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}
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int prot_from_flags(int flags) {
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switch (flags & O_ACCMODE) {
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case O_RDONLY:
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return PROT_READ;
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case O_WRONLY:
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return PROT_WRITE;
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case O_RDWR:
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return PROT_READ|PROT_WRITE;
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default:
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return -EINVAL;
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}
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}
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int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
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bool stdout_is_tty, stderr_is_tty;
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pid_t parent_pid, agent_pid;
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sigset_t ss, saved_ss;
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unsigned n, i;
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va_list ap;
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char **l;
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assert(pid);
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assert(path);
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/* Spawns a temporary TTY agent, making sure it goes away when
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* we go away */
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parent_pid = getpid();
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/* First we temporarily block all signals, so that the new
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* child has them blocked initially. This way, we can be sure
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* that SIGTERMs are not lost we might send to the agent. */
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assert_se(sigfillset(&ss) >= 0);
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assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0);
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agent_pid = fork();
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if (agent_pid < 0) {
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assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
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return -errno;
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}
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if (agent_pid != 0) {
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assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
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*pid = agent_pid;
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return 0;
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}
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/* In the child:
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*
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* Make sure the agent goes away when the parent dies */
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if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
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_exit(EXIT_FAILURE);
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/* Make sure we actually can kill the agent, if we need to, in
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* case somebody invoked us from a shell script that trapped
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* SIGTERM or so... */
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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/* Check whether our parent died before we were able
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* to set the death signal and unblock the signals */
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if (getppid() != parent_pid)
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_exit(EXIT_SUCCESS);
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/* Don't leak fds to the agent */
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close_all_fds(except, n_except);
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stdout_is_tty = isatty(STDOUT_FILENO);
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stderr_is_tty = isatty(STDERR_FILENO);
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if (!stdout_is_tty || !stderr_is_tty) {
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int fd;
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/* Detach from stdout/stderr. and reopen
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* /dev/tty for them. This is important to
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* ensure that when systemctl is started via
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* popen() or a similar call that expects to
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* read EOF we actually do generate EOF and
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* not delay this indefinitely by because we
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* keep an unused copy of stdin around. */
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fd = open("/dev/tty", O_WRONLY);
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if (fd < 0) {
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log_error_errno(errno, "Failed to open /dev/tty: %m");
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_exit(EXIT_FAILURE);
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}
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if (!stdout_is_tty)
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dup2(fd, STDOUT_FILENO);
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if (!stderr_is_tty)
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dup2(fd, STDERR_FILENO);
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if (fd > 2)
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close(fd);
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}
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/* Count arguments */
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va_start(ap, path);
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for (n = 0; va_arg(ap, char*); n++)
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;
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va_end(ap);
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/* Allocate strv */
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l = alloca(sizeof(char *) * (n + 1));
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/* Fill in arguments */
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va_start(ap, path);
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for (i = 0; i <= n; i++)
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l[i] = va_arg(ap, char*);
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va_end(ap);
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execv(path, l);
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_exit(EXIT_FAILURE);
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}
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bool in_initrd(void) {
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static int saved = -1;
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struct statfs s;
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if (saved >= 0)
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return saved;
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/* We make two checks here:
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*
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* 1. the flag file /etc/initrd-release must exist
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* 2. the root file system must be a memory file system
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*
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* The second check is extra paranoia, since misdetecting an
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* initrd can have bad bad consequences due the initrd
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* emptying when transititioning to the main systemd.
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*/
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saved = access("/etc/initrd-release", F_OK) >= 0 &&
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statfs("/", &s) >= 0 &&
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is_temporary_fs(&s);
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return saved;
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}
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/* hey glibc, APIs with callbacks without a user pointer are so useless */
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void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
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int (*compar) (const void *, const void *, void *), void *arg) {
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size_t l, u, idx;
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const void *p;
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int comparison;
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l = 0;
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u = nmemb;
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while (l < u) {
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idx = (l + u) / 2;
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p = (void *)(((const char *) base) + (idx * size));
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comparison = compar(key, p, arg);
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if (comparison < 0)
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u = idx;
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else if (comparison > 0)
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l = idx + 1;
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else
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return (void *)p;
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}
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return NULL;
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}
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int on_ac_power(void) {
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bool found_offline = false, found_online = false;
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_cleanup_closedir_ DIR *d = NULL;
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d = opendir("/sys/class/power_supply");
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if (!d)
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return errno == ENOENT ? true : -errno;
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for (;;) {
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struct dirent *de;
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_cleanup_close_ int fd = -1, device = -1;
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char contents[6];
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ssize_t n;
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errno = 0;
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de = readdir(d);
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if (!de && errno > 0)
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return -errno;
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if (!de)
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break;
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if (hidden_file(de->d_name))
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continue;
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device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
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if (device < 0) {
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if (errno == ENOENT || errno == ENOTDIR)
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continue;
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return -errno;
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}
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fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
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if (fd < 0) {
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if (errno == ENOENT)
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continue;
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return -errno;
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}
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n = read(fd, contents, sizeof(contents));
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if (n < 0)
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return -errno;
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if (n != 6 || memcmp(contents, "Mains\n", 6))
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continue;
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safe_close(fd);
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fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
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if (fd < 0) {
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if (errno == ENOENT)
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continue;
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return -errno;
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}
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n = read(fd, contents, sizeof(contents));
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if (n < 0)
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return -errno;
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if (n != 2 || contents[1] != '\n')
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return -EIO;
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|
|
if (contents[0] == '1') {
|
|
found_online = true;
|
|
break;
|
|
} else if (contents[0] == '0')
|
|
found_offline = true;
|
|
else
|
|
return -EIO;
|
|
}
|
|
|
|
return found_online || !found_offline;
|
|
}
|
|
|
|
bool id128_is_valid(const char *s) {
|
|
size_t i, l;
|
|
|
|
l = strlen(s);
|
|
if (l == 32) {
|
|
|
|
/* Simple formatted 128bit hex string */
|
|
|
|
for (i = 0; i < l; i++) {
|
|
char c = s[i];
|
|
|
|
if (!(c >= '0' && c <= '9') &&
|
|
!(c >= 'a' && c <= 'z') &&
|
|
!(c >= 'A' && c <= 'Z'))
|
|
return false;
|
|
}
|
|
|
|
} else if (l == 36) {
|
|
|
|
/* Formatted UUID */
|
|
|
|
for (i = 0; i < l; i++) {
|
|
char c = s[i];
|
|
|
|
if ((i == 8 || i == 13 || i == 18 || i == 23)) {
|
|
if (c != '-')
|
|
return false;
|
|
} else {
|
|
if (!(c >= '0' && c <= '9') &&
|
|
!(c >= 'a' && c <= 'z') &&
|
|
!(c >= 'A' && c <= 'Z'))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
} else
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int container_get_leader(const char *machine, pid_t *pid) {
|
|
_cleanup_free_ char *s = NULL, *class = NULL;
|
|
const char *p;
|
|
pid_t leader;
|
|
int r;
|
|
|
|
assert(machine);
|
|
assert(pid);
|
|
|
|
if (!machine_name_is_valid(machine))
|
|
return -EINVAL;
|
|
|
|
p = strjoina("/run/systemd/machines/", machine);
|
|
r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
|
|
if (r == -ENOENT)
|
|
return -EHOSTDOWN;
|
|
if (r < 0)
|
|
return r;
|
|
if (!s)
|
|
return -EIO;
|
|
|
|
if (!streq_ptr(class, "container"))
|
|
return -EIO;
|
|
|
|
r = parse_pid(s, &leader);
|
|
if (r < 0)
|
|
return r;
|
|
if (leader <= 1)
|
|
return -EIO;
|
|
|
|
*pid = leader;
|
|
return 0;
|
|
}
|
|
|
|
int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd) {
|
|
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1, usernsfd = -1;
|
|
int rfd = -1;
|
|
|
|
assert(pid >= 0);
|
|
|
|
if (mntns_fd) {
|
|
const char *mntns;
|
|
|
|
mntns = procfs_file_alloca(pid, "ns/mnt");
|
|
mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (mntnsfd < 0)
|
|
return -errno;
|
|
}
|
|
|
|
if (pidns_fd) {
|
|
const char *pidns;
|
|
|
|
pidns = procfs_file_alloca(pid, "ns/pid");
|
|
pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (pidnsfd < 0)
|
|
return -errno;
|
|
}
|
|
|
|
if (netns_fd) {
|
|
const char *netns;
|
|
|
|
netns = procfs_file_alloca(pid, "ns/net");
|
|
netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (netnsfd < 0)
|
|
return -errno;
|
|
}
|
|
|
|
if (userns_fd) {
|
|
const char *userns;
|
|
|
|
userns = procfs_file_alloca(pid, "ns/user");
|
|
usernsfd = open(userns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (usernsfd < 0 && errno != ENOENT)
|
|
return -errno;
|
|
}
|
|
|
|
if (root_fd) {
|
|
const char *root;
|
|
|
|
root = procfs_file_alloca(pid, "root");
|
|
rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
|
|
if (rfd < 0)
|
|
return -errno;
|
|
}
|
|
|
|
if (pidns_fd)
|
|
*pidns_fd = pidnsfd;
|
|
|
|
if (mntns_fd)
|
|
*mntns_fd = mntnsfd;
|
|
|
|
if (netns_fd)
|
|
*netns_fd = netnsfd;
|
|
|
|
if (userns_fd)
|
|
*userns_fd = usernsfd;
|
|
|
|
if (root_fd)
|
|
*root_fd = rfd;
|
|
|
|
pidnsfd = mntnsfd = netnsfd = usernsfd = -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd) {
|
|
if (userns_fd >= 0) {
|
|
/* Can't setns to your own userns, since then you could
|
|
* escalate from non-root to root in your own namespace, so
|
|
* check if namespaces equal before attempting to enter. */
|
|
_cleanup_free_ char *userns_fd_path = NULL;
|
|
int r;
|
|
if (asprintf(&userns_fd_path, "/proc/self/fd/%d", userns_fd) < 0)
|
|
return -ENOMEM;
|
|
|
|
r = files_same(userns_fd_path, "/proc/self/ns/user");
|
|
if (r < 0)
|
|
return r;
|
|
if (r)
|
|
userns_fd = -1;
|
|
}
|
|
|
|
if (pidns_fd >= 0)
|
|
if (setns(pidns_fd, CLONE_NEWPID) < 0)
|
|
return -errno;
|
|
|
|
if (mntns_fd >= 0)
|
|
if (setns(mntns_fd, CLONE_NEWNS) < 0)
|
|
return -errno;
|
|
|
|
if (netns_fd >= 0)
|
|
if (setns(netns_fd, CLONE_NEWNET) < 0)
|
|
return -errno;
|
|
|
|
if (userns_fd >= 0)
|
|
if (setns(userns_fd, CLONE_NEWUSER) < 0)
|
|
return -errno;
|
|
|
|
if (root_fd >= 0) {
|
|
if (fchdir(root_fd) < 0)
|
|
return -errno;
|
|
|
|
if (chroot(".") < 0)
|
|
return -errno;
|
|
}
|
|
|
|
return reset_uid_gid();
|
|
}
|
|
|
|
uint64_t physical_memory(void) {
|
|
long mem;
|
|
|
|
/* We return this as uint64_t in case we are running as 32bit
|
|
* process on a 64bit kernel with huge amounts of memory */
|
|
|
|
mem = sysconf(_SC_PHYS_PAGES);
|
|
assert(mem > 0);
|
|
|
|
return (uint64_t) mem * (uint64_t) page_size();
|
|
}
|
|
|
|
int update_reboot_param_file(const char *param) {
|
|
int r = 0;
|
|
|
|
if (param) {
|
|
r = write_string_file(REBOOT_PARAM_FILE, param, WRITE_STRING_FILE_CREATE);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to write reboot param to "REBOOT_PARAM_FILE": %m");
|
|
} else
|
|
(void) unlink(REBOOT_PARAM_FILE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int version(void) {
|
|
puts(PACKAGE_STRING "\n"
|
|
SYSTEMD_FEATURES);
|
|
return 0;
|
|
}
|