X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudevadm-settle.c;h=b7852ff60ad146b1cc2c4b1922ed78f5c447271c;hp=5e5a080bc887bebe8be28d986b6f5bccfa4a3063;hb=ff2c503df091e6e4e9ab48cdb6df6ec8b7b525d0;hpb=033e9f8cde5a7feec1334888aec69def99c945b5 diff --git a/udev/udevadm-settle.c b/udev/udevadm-settle.c index 5e5a080bc..b7852ff60 100644 --- a/udev/udevadm-settle.c +++ b/udev/udevadm-settle.c @@ -1,5 +1,7 @@ /* - * Copyright (C) 2006-2008 Kay Sievers + * Copyright (C) 2006-2009 Kay Sievers + * Copyright (C) 2009 Canonical Ltd. + * Copyright (C) 2009 Scott James Remnant * * 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 @@ -25,6 +27,8 @@ #include #include #include +#include +#include #include #include @@ -33,64 +37,186 @@ #define DEFAULT_TIMEOUT 180 #define LOOP_PER_SECOND 20 +static volatile sig_atomic_t is_timeout; + +static void sig_handler(int signum) +{ + switch (signum) { + case SIGALRM: + is_timeout = 1; + } +} + int udevadm_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' }, {} }; + unsigned long long start = 0; + unsigned long long end = 0; + int quiet = 0; + const char *exists = NULL; int timeout = DEFAULT_TIMEOUT; - struct udev_queue *udev_queue; - int loop; - int rc = 0; + struct sigaction act; + sigset_t mask; + struct udev_queue *udev_queue = NULL; + int rc = 1; dbg(udev, "version %s\n", VERSION); - while (1) { + /* set signal handlers */ + memset(&act, 0x00, sizeof(act)); + act.sa_handler = sig_handler; + sigemptyset (&act.sa_mask); + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); + sigemptyset(&mask); + sigaddset(&mask, SIGALRM); + sigprocmask(SIG_UNBLOCK, &mask, NULL); + + for (;;) { int option; int seconds; - option = getopt_long(argc, argv, "t:h", options, NULL); + 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) + if (seconds >= 0) timeout = seconds; else fprintf(stderr, "invalid timeout value\n"); dbg(udev, "timeout=%i\n", timeout); break; + case 'q': + quiet = 1; + break; + case 'E': + exists = optarg; + break; case 'h': - printf("Usage: udevadm settle [--help] [--timeout=]\n\n"); - goto exit; + printf("Usage: udevadm settle OPTIONS\n" + " --timeout= maximum time to wait for events\n" + " --seq-start= first seqnum to wait for\n" + " --seq-end= last seqnum to wait for\n" + " --exit-if-exists= stop waiting if file exists\n" + " --quiet do not print list after timeout\n" + " --help\n\n"); + exit(0); } } + if (timeout > 0) + alarm(timeout); + else + is_timeout = 1; + udev_queue = udev_queue_new(udev); if (udev_queue == NULL) - goto exit; - loop = timeout * LOOP_PER_SECOND; - while (loop--) { - if (udev_queue_get_queue_is_empty(udev_queue)) + 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) { + err(udev, "seq-start larger than seq-end, ignoring\n"); + start = 0; + end = 0; + } + + if (start > kernel_seq || end > kernel_seq) { + err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n"); + start = 0; + end = 0; + } + info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq); + } else { + if (end > 0) { + err(udev, "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_from_socket(udev, UDEV_CTRL_SOCK_PATH); + if (uctrl != NULL) { + if (udev_ctrl_send_ping(uctrl, timeout) < 0) { + info(udev, "no connection to daemon\n"); + udev_ctrl_unref(uctrl); + rc = 0; + goto out; + } + udev_ctrl_unref(uctrl); + } + } + + for (;;) { + struct stat statbuf; + const struct timespec duration = { 0 , 1000 * 1000 * 1000 / LOOP_PER_SECOND }; + + if (exists != NULL && stat(exists, &statbuf) == 0) { + rc = 0; break; - usleep(1000 * 1000 / LOOP_PER_SECOND); + } + + 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 = 0; + break; + } + } else { + /* exit if queue is empty */ + if (udev_queue_get_queue_is_empty(udev_queue)) { + rc = 0; + break; + } + } + + if (is_timeout) + break; + + nanosleep(&duration, NULL); } - if (loop <= 0) { + + /* if we reached the timeout, print the list of remaining events */ + if (is_timeout) { struct udev_list_entry *list_entry; - info(udev, "timeout waiting for udev queue\n"); - printf("\ndevadm 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)); - rc = 1; + if (!quiet && udev_queue_get_queued_list_entry(udev_queue) != NULL) { + info(udev, "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)); + } } -exit: +out: udev_queue_unref(udev_queue); return rc; }