static int spawn_child(const char* child, char** argv) { int fd[2]; pid_t parent_pid, child_pid; int r; if (pipe(fd) < 0) return log_error_errno(errno, "Failed to create pager pipe: %m"); parent_pid = getpid(); child_pid = fork(); if (child_pid < 0) { r = -errno; log_error_errno(errno, "Failed to fork: %m"); safe_close_pair(fd); return r; } /* In the child */ if (child_pid == 0) { r = dup2(fd[1], STDOUT_FILENO); if (r < 0) { log_error_errno(errno, "Failed to dup pipe to stdout: %m"); _exit(EXIT_FAILURE); } safe_close_pair(fd); /* Make sure the child goes away when the parent dies */ if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) _exit(EXIT_FAILURE); /* Check whether our parent died before we were able * to set the death signal */ if (getppid() != parent_pid) _exit(EXIT_SUCCESS); execvp(child, argv); log_error_errno(errno, "Failed to exec child %s: %m", child); _exit(EXIT_FAILURE); } r = close(fd[1]); if (r < 0) log_warning_errno(errno, "Failed to close write end of pipe: %m"); return fd[0]; }
static DynamicUser* dynamic_user_free(DynamicUser *d) { if (!d) return NULL; if (d->manager) (void) hashmap_remove(d->manager->dynamic_users, d->name); safe_close_pair(d->storage_socket); return mfree(d); }
static void connection_free(Connection *c) { assert(c); if (c->context) set_remove(c->context->connections, c); sd_event_source_unref(c->server_event_source); sd_event_source_unref(c->client_event_source); safe_close(c->server_fd); safe_close(c->client_fd); safe_close_pair(c->server_to_client_buffer); safe_close_pair(c->client_to_server_buffer); sd_resolve_query_unref(c->resolve_query); free(c); }
int main(int argc, char *argv[]) { const char *cmdline[9]; int i = 0, r = EXIT_FAILURE, q; pid_t pid; siginfo_t status; _cleanup_udev_unref_ struct udev *udev = NULL; _cleanup_udev_device_unref_ struct udev_device *udev_device = NULL; const char *device, *type; bool root_directory; int progress_pipe[2] = { -1, -1 }; char dash_c[2+10+1]; struct stat st; if (argc > 2) { log_error("This program expects one or no arguments."); return EXIT_FAILURE; } log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); umask(0022); q = parse_proc_cmdline(parse_proc_cmdline_item); if (q < 0) log_warning_errno(q, "Failed to parse kernel command line, ignoring: %m"); test_files(); if (!arg_force && arg_skip) return 0; udev = udev_new(); if (!udev) { log_oom(); return EXIT_FAILURE; } if (argc > 1) { device = argv[1]; root_directory = false; if (stat(device, &st) < 0) { log_error_errno(errno, "Failed to stat '%s': %m", device); return EXIT_FAILURE; } udev_device = udev_device_new_from_devnum(udev, 'b', st.st_rdev); if (!udev_device) { log_error("Failed to detect device %s", device); return EXIT_FAILURE; } } else { struct timespec times[2]; /* Find root device */ if (stat("/", &st) < 0) { log_error_errno(errno, "Failed to stat() the root directory: %m"); return EXIT_FAILURE; } /* Virtual root devices don't need an fsck */ if (major(st.st_dev) == 0) return EXIT_SUCCESS; /* check if we are already writable */ times[0] = st.st_atim; times[1] = st.st_mtim; if (utimensat(AT_FDCWD, "/", times, 0) == 0) { log_info("Root directory is writable, skipping check."); return EXIT_SUCCESS; } udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev); if (!udev_device) { log_error("Failed to detect root device."); return EXIT_FAILURE; } device = udev_device_get_devnode(udev_device); if (!device) { log_error("Failed to detect device node of root directory."); return EXIT_FAILURE; } root_directory = true; } type = udev_device_get_property_value(udev_device, "ID_FS_TYPE"); if (type) { r = fsck_exists(type); if (r == -ENOENT) { log_info("fsck.%s doesn't exist, not checking file system on %s", type, device); return EXIT_SUCCESS; } else if (r < 0) log_warning_errno(r, "fsck.%s cannot be used for %s: %m", type, device); } if (arg_show_progress) if (pipe(progress_pipe) < 0) { log_error_errno(errno, "pipe(): %m"); return EXIT_FAILURE; } cmdline[i++] = "/sbin/fsck"; cmdline[i++] = arg_repair; cmdline[i++] = "-T"; /* * Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files. * The previous versions use flock for the device and conflict with * udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5 */ cmdline[i++] = "-l"; if (!root_directory) cmdline[i++] = "-M"; if (arg_force) cmdline[i++] = "-f"; if (progress_pipe[1] >= 0) { snprintf(dash_c, sizeof(dash_c), "-C%i", progress_pipe[1]); char_array_0(dash_c); cmdline[i++] = dash_c; } cmdline[i++] = device; cmdline[i++] = NULL; pid = fork(); if (pid < 0) { log_error_errno(errno, "fork(): %m"); goto finish; } else if (pid == 0) { /* Child */ if (progress_pipe[0] >= 0) safe_close(progress_pipe[0]); execv(cmdline[0], (char**) cmdline); _exit(8); /* Operational error */ } progress_pipe[1] = safe_close(progress_pipe[1]); if (progress_pipe[0] >= 0) { process_progress(progress_pipe[0]); progress_pipe[0] = -1; } q = wait_for_terminate(pid, &status); if (q < 0) { log_error_errno(q, "waitid(): %m"); goto finish; } if (status.si_code != CLD_EXITED || (status.si_status & ~1)) { if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED) log_error("fsck terminated by signal %s.", signal_to_string(status.si_status)); else if (status.si_code == CLD_EXITED) log_error("fsck failed with error code %i.", status.si_status); else log_error("fsck failed due to unknown reason."); if (status.si_code == CLD_EXITED && (status.si_status & 2) && root_directory) /* System should be rebooted. */ start_target(SPECIAL_REBOOT_TARGET); else if (status.si_code == CLD_EXITED && (status.si_status & 6)) /* Some other problem */ start_target(SPECIAL_EMERGENCY_TARGET); else { r = EXIT_SUCCESS; log_warning("Ignoring error."); } } else r = EXIT_SUCCESS; if (status.si_code == CLD_EXITED && (status.si_status & 1)) touch("/run/systemd/quotacheck"); finish: safe_close_pair(progress_pipe); return r; }
int pager_open(bool jump_to_end) { int fd[2]; const char *pager; pid_t parent_pid; int r; if (pager_pid > 0) return 1; if ((pager = getenv("SYSTEMD_PAGER")) || (pager = getenv("PAGER"))) if (!*pager || streq(pager, "cat")) return 0; if (!on_tty()) return 0; /* Determine and cache number of columns before we spawn the * pager so that we get the value from the actual tty */ columns(); if (pipe(fd) < 0) return log_error_errno(errno, "Failed to create pager pipe: %m"); parent_pid = getpid(); pager_pid = fork(); if (pager_pid < 0) { r = -errno; log_error_errno(errno, "Failed to fork pager: %m"); safe_close_pair(fd); return r; } /* In the child start the pager */ if (pager_pid == 0) { const char* less_opts; dup2(fd[0], STDIN_FILENO); safe_close_pair(fd); less_opts = getenv("SYSTEMD_LESS"); if (!less_opts) less_opts = "FRSXMK"; if (jump_to_end) less_opts = strjoina(less_opts, " +G"); setenv("LESS", less_opts, 1); /* Make sure the pager goes away when the parent dies */ if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) _exit(EXIT_FAILURE); /* Check whether our parent died before we were able * to set the death signal */ if (getppid() != parent_pid) _exit(EXIT_SUCCESS); if (pager) { execlp(pager, pager, NULL); execl("/bin/sh", "sh", "-c", pager, NULL); } /* Debian's alternatives command for pagers is * called 'pager'. Note that we do not call * sensible-pagers here, since that is just a * shell script that implements a logic that * is similar to this one anyway, but is * Debian-specific. */ execlp("pager", "pager", NULL); execlp("less", "less", NULL); execlp("more", "more", NULL); pager_fallback(); /* not reached */ } /* Return in the parent */ if (dup2(fd[1], STDOUT_FILENO) < 0) return log_error_errno(errno, "Failed to duplicate pager pipe: %m"); safe_close_pair(fd); return 1; }
int main(int argc, char *argv[]) { sd_event *e = NULL; sd_event_source *w = NULL, *x = NULL, *y = NULL, *z = NULL, *q = NULL, *t = NULL; static const char ch = 'x'; int a[2] = { -1, -1 }, b[2] = { -1, -1}, d[2] = { -1, -1}, k[2] = { -1, -1 }; assert_se(pipe(a) >= 0); assert_se(pipe(b) >= 0); assert_se(pipe(d) >= 0); assert_se(pipe(k) >= 0); assert_se(sd_event_default(&e) >= 0); assert_se(sd_event_set_watchdog(e, true) >= 0); /* Test whether we cleanly can destroy an io event source from its own handler */ got_unref = false; assert_se(sd_event_add_io(e, &t, k[0], EPOLLIN, unref_handler, NULL) >= 0); assert_se(write(k[1], &ch, 1) == 1); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_unref); got_a = false, got_b = false, got_c = false, got_d = 0; /* Add a oneshot handler, trigger it, re-enable it, and trigger * it again. */ assert_se(sd_event_add_io(e, &w, d[0], EPOLLIN, io_handler, INT_TO_PTR('d')) >= 0); assert_se(sd_event_source_set_enabled(w, SD_EVENT_ONESHOT) >= 0); assert_se(write(d[1], &ch, 1) >= 0); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_d == 1); assert_se(write(d[1], &ch, 1) >= 0); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_d == 2); assert_se(sd_event_add_io(e, &x, a[0], EPOLLIN, io_handler, INT_TO_PTR('a')) >= 0); assert_se(sd_event_add_io(e, &y, b[0], EPOLLIN, io_handler, INT_TO_PTR('b')) >= 0); assert_se(sd_event_add_time(e, &z, CLOCK_MONOTONIC, 0, 0, time_handler, INT_TO_PTR('c')) >= 0); assert_se(sd_event_add_exit(e, &q, exit_handler, INT_TO_PTR('g')) >= 0); assert_se(sd_event_source_set_priority(x, 99) >= 0); assert_se(sd_event_source_set_enabled(y, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_source_set_prepare(x, prepare_handler) >= 0); assert_se(sd_event_source_set_priority(z, 50) >= 0); assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_source_set_prepare(z, prepare_handler) >= 0); /* Test for floating event sources */ assert_se(sigprocmask_many(SIG_BLOCK, SIGRTMIN+1, -1) == 0); assert_se(sd_event_add_signal(e, NULL, SIGRTMIN+1, NULL, NULL) >= 0); assert_se(write(a[1], &ch, 1) >= 0); assert_se(write(b[1], &ch, 1) >= 0); assert_se(!got_a && !got_b && !got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(!got_a && got_b && !got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(!got_a && got_b && got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_a && got_b && got_c); sd_event_source_unref(x); sd_event_source_unref(y); do_quit = true; assert_se(sd_event_source_set_time(z, now(CLOCK_MONOTONIC) + 200 * USEC_PER_MSEC) >= 0); assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_loop(e) >= 0); sd_event_source_unref(z); sd_event_source_unref(q); sd_event_source_unref(w); sd_event_unref(e); safe_close_pair(a); safe_close_pair(b); safe_close_pair(d); safe_close_pair(k); return 0; }
static void automount_enter_waiting(Automount *a) { _cleanup_close_ int ioctl_fd = -1; int p[2] = { -1, -1 }; char name[sizeof("systemd-")-1 + DECIMAL_STR_MAX(pid_t) + 1]; char options[sizeof("fd=,pgrp=,minproto=5,maxproto=5,direct")-1 + DECIMAL_STR_MAX(int) + DECIMAL_STR_MAX(gid_t) + 1]; bool mounted = false; int r, dev_autofs_fd; struct stat st; assert(a); assert(a->pipe_fd < 0); assert(a->where); set_clear(a->tokens); r = unit_fail_if_symlink(UNIT(a), a->where); if (r < 0) goto fail; (void) mkdir_p_label(a->where, 0555); unit_warn_if_dir_nonempty(UNIT(a), a->where); dev_autofs_fd = open_dev_autofs(UNIT(a)->manager); if (dev_autofs_fd < 0) { r = dev_autofs_fd; goto fail; } if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) { r = -errno; goto fail; } xsprintf(options, "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct", p[1], getpgrp()); xsprintf(name, "systemd-"PID_FMT, getpid()); if (mount(name, a->where, "autofs", 0, options) < 0) { r = -errno; goto fail; } mounted = true; p[1] = safe_close(p[1]); if (stat(a->where, &st) < 0) { r = -errno; goto fail; } ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev); if (ioctl_fd < 0) { r = ioctl_fd; goto fail; } r = autofs_protocol(dev_autofs_fd, ioctl_fd); if (r < 0) goto fail; r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, a->timeout_idle_usec); if (r < 0) goto fail; /* Autofs fun fact: * * Unless we close the ioctl fd here, for some weird reason * the direct mount will not receive events from the * kernel. */ r = sd_event_add_io(UNIT(a)->manager->event, &a->pipe_event_source, p[0], EPOLLIN, automount_dispatch_io, a); if (r < 0) goto fail; (void) sd_event_source_set_description(a->pipe_event_source, "automount-io"); a->pipe_fd = p[0]; a->dev_id = st.st_dev; automount_set_state(a, AUTOMOUNT_WAITING); return; fail: log_unit_error_errno(UNIT(a), r, "Failed to initialize automounter: %m"); safe_close_pair(p); if (mounted) { r = repeat_unmount(a->where, MNT_DETACH); if (r < 0) log_error_errno(r, "Failed to unmount, ignoring: %m"); } automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); }
int pager_open(bool no_pager, bool jump_to_end) { _cleanup_close_pair_ int fd[2] = { -1, -1 }; const char *pager; pid_t parent_pid; if (no_pager) return 0; if (pager_pid > 0) return 1; if (terminal_is_dumb()) return 0; pager = getenv("SYSTEMD_PAGER"); if (!pager) pager = getenv("PAGER"); /* If the pager is explicitly turned off, honour it */ if (pager && STR_IN_SET(pager, "", "cat")) return 0; /* Determine and cache number of columns before we spawn the * pager so that we get the value from the actual tty */ (void) columns(); if (pipe(fd) < 0) return log_error_errno(errno, "Failed to create pager pipe: %m"); parent_pid = getpid(); pager_pid = fork(); if (pager_pid < 0) return log_error_errno(errno, "Failed to fork pager: %m"); /* In the child start the pager */ if (pager_pid == 0) { const char* less_opts, *less_charset; (void) reset_all_signal_handlers(); (void) reset_signal_mask(); (void) dup2(fd[0], STDIN_FILENO); safe_close_pair(fd); /* Initialize a good set of less options */ less_opts = getenv("SYSTEMD_LESS"); if (!less_opts) less_opts = "FRSXMK"; if (jump_to_end) less_opts = strjoina(less_opts, " +G"); setenv("LESS", less_opts, 1); /* Initialize a good charset for less. This is * particularly important if we output UTF-8 * characters. */ less_charset = getenv("SYSTEMD_LESSCHARSET"); if (!less_charset && is_locale_utf8()) less_charset = "utf-8"; if (less_charset) setenv("LESSCHARSET", less_charset, 1); /* Make sure the pager goes away when the parent dies */ if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) _exit(EXIT_FAILURE); /* Check whether our parent died before we were able * to set the death signal */ if (getppid() != parent_pid) _exit(EXIT_SUCCESS); if (pager) { execlp(pager, pager, NULL); execl("/bin/sh", "sh", "-c", pager, NULL); } /* Debian's alternatives command for pagers is * called 'pager'. Note that we do not call * sensible-pagers here, since that is just a * shell script that implements a logic that * is similar to this one anyway, but is * Debian-specific. */ execlp("pager", "pager", NULL); execlp("less", "less", NULL); execlp("more", "more", NULL); pager_fallback(); /* not reached */ } /* Return in the parent */ if (dup2(fd[1], STDOUT_FILENO) < 0) return log_error_errno(errno, "Failed to duplicate pager pipe: %m"); if (dup2(fd[1], STDERR_FILENO) < 0) return log_error_errno(errno, "Failed to duplicate pager pipe: %m"); return 1; }