Fork of Original Code Base: anongit.freedesktop.org/systemd

This is the initial fork of the code base from freedsktop.org.
The code is provided here as a reference of the initial starting
point and for possible future checkouts after a large portion
of this code is removed.

Merge git://anongit.freedesktop.org/systemd/systemd

1 files changed, 232 insertions, 0 deletions

diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
new file mode 100644
index 0000000000..c4fc4ee4e5
--- /dev/null
+++ b/src/udev/udevadm-settle.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (C) 2006-2009 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2009 Canonical Ltd.
+ * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <getopt.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/inotify.h>
+#include <sys/poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "udev.h"
+
+static int adm_settle(struct udev *udev, int argc, char *argv[])
+{
+        static const struct option options[] = {
+                { "seq-start", required_argument, NULL, 's' },
+                { "seq-end", required_argument, NULL, 'e' },
+                { "timeout", required_argument, NULL, 't' },
+                { "exit-if-exists", required_argument, NULL, 'E' },
+                { "quiet", no_argument, NULL, 'q' },
+                { "help", no_argument, NULL, 'h' },
+                {}
+        };
+        usec_t start_usec = now(CLOCK_MONOTONIC);
+        usec_t start = 0;
+        usec_t end = 0;
+        int quiet = 0;
+        const char *exists = NULL;
+        unsigned int timeout = 120;
+        struct pollfd pfd[1] = { {.fd = -1}, };
+        struct udev_queue *udev_queue = NULL;
+        int rc = EXIT_FAILURE;
+
+        for (;;) {
+                int option;
+                int seconds;
+
+                option = getopt_long(argc, argv, "s:e:t:E:qh", options, NULL);
+                if (option == -1)
+                        break;
+
+                switch (option) {
+                case 's':
+                        start = strtoull(optarg, NULL, 0);
+                        break;
+                case 'e':
+                        end = strtoull(optarg, NULL, 0);
+                        break;
+                case 't':
+                        seconds = atoi(optarg);
+                        if (seconds >= 0)
+                                timeout = seconds;
+                        else
+                                fprintf(stderr, "invalid timeout value\n");
+                        break;
+                case 'q':
+                        quiet = 1;
+                        break;
+                case 'E':
+                        exists = optarg;
+                        break;
+                case 'h':
+                        printf("Usage: udevadm settle OPTIONS\n"
+                               "  --timeout=<seconds>     maximum time to wait for events\n"
+                               "  --seq-start=<seqnum>    first seqnum to wait for\n"
+                               "  --seq-end=<seqnum>      last seqnum to wait for\n"
+                               "  --exit-if-exists=<file> stop waiting if file exists\n"
+                               "  --quiet                 do not print list after timeout\n"
+                               "  --help\n\n");
+                        exit(EXIT_SUCCESS);
+                default:
+                        exit(EXIT_FAILURE);
+                }
+        }
+
+        udev_queue = udev_queue_new(udev);
+        if (udev_queue == NULL)
+                exit(2);
+
+        if (start > 0) {
+                unsigned long long kernel_seq;
+
+                kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
+
+                /* unless specified, the last event is the current kernel seqnum */
+                if (end == 0)
+                        end = udev_queue_get_kernel_seqnum(udev_queue);
+
+                if (start > end) {
+                        log_error("seq-start larger than seq-end, ignoring\n");
+                        start = 0;
+                        end = 0;
+                }
+
+                if (start > kernel_seq || end > kernel_seq) {
+                        log_error("seq-start or seq-end larger than current kernel value, ignoring\n");
+                        start = 0;
+                        end = 0;
+                }
+                log_debug("start=%llu end=%llu current=%llu\n", (unsigned long long)start, (unsigned long long)end, kernel_seq);
+        } else {
+                if (end > 0) {
+                        log_error("seq-end needs seq-start parameter, ignoring\n");
+                        end = 0;
+                }
+        }
+
+        /* guarantee that the udev daemon isn't pre-processing */
+        if (getuid() == 0) {
+                struct udev_ctrl *uctrl;
+
+                uctrl = udev_ctrl_new(udev);
+                if (uctrl != NULL) {
+                        if (udev_ctrl_send_ping(uctrl, timeout) < 0) {
+                                log_debug("no connection to daemon\n");
+                                udev_ctrl_unref(uctrl);
+                                rc = EXIT_SUCCESS;
+                                goto out;
+                        }
+                        udev_ctrl_unref(uctrl);
+                }
+        }
+
+        pfd[0].events = POLLIN;
+        pfd[0].fd = inotify_init1(IN_CLOEXEC);
+        if (pfd[0].fd < 0) {
+                log_error("inotify_init failed: %m\n");
+        } else {
+                if (inotify_add_watch(pfd[0].fd, "/run/udev" , IN_MOVED_TO) < 0) {
+                        log_error("watching /run/udev failed\n");
+                        close(pfd[0].fd);
+                        pfd[0].fd = -1;
+                }
+        }
+
+        for (;;) {
+                struct stat statbuf;
+
+                if (exists != NULL && stat(exists, &statbuf) == 0) {
+                        rc = EXIT_SUCCESS;
+                        break;
+                }
+
+                if (start > 0) {
+                        /* if asked for, wait for a specific sequence of events */
+                        if (udev_queue_get_seqnum_sequence_is_finished(udev_queue, start, end) == 1) {
+                                rc = EXIT_SUCCESS;
+                                break;
+                        }
+                } else {
+                        /* exit if queue is empty */
+                        if (udev_queue_get_queue_is_empty(udev_queue)) {
+                                rc = EXIT_SUCCESS;
+                                break;
+                        }
+                }
+
+                if (pfd[0].fd >= 0) {
+                        int delay;
+
+                        if (exists != NULL || start > 0)
+                                delay = 100;
+                        else
+                                delay = 1000;
+                        /* wake up after delay, or immediately after the queue is rebuilt */
+                        if (poll(pfd, 1, delay) > 0 && pfd[0].revents & POLLIN) {
+                                char buf[sizeof(struct inotify_event) + PATH_MAX];
+
+                                read(pfd[0].fd, buf, sizeof(buf));
+                        }
+                } else {
+                        sleep(1);
+                }
+
+                if (timeout > 0) {
+                        usec_t age_usec;
+
+                        age_usec = now(CLOCK_MONOTONIC) - start_usec;
+                        if (age_usec / (1000 * 1000) >= timeout) {
+                                struct udev_list_entry *list_entry;
+
+                                if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) {
+                                        log_debug("timeout waiting for udev queue\n");
+                                        printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
+                                        udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
+                                                printf("  %s (%s)\n",
+                                                udev_list_entry_get_name(list_entry),
+                                                udev_list_entry_get_value(list_entry));
+                                }
+
+                                break;
+                        }
+                }
+        }
+out:
+        if (pfd[0].fd >= 0)
+                close(pfd[0].fd);
+        udev_queue_unref(udev_queue);
+        return rc;
+}
+
+const struct udevadm_cmd udevadm_settle = {
+        .name = "settle",
+        .cmd = adm_settle,
+        .help = "wait for the event queue to finish",
+};