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Diffstat (limited to 'src/readahead/readahead.c')
| -rw-r--r-- | src/readahead/readahead.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/readahead/readahead.c b/src/readahead/readahead.c new file mode 100644 index 0000000000..abeecc7634 --- /dev/null +++ b/src/readahead/readahead.c @@ -0,0 +1,158 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <stdio.h> +#include <getopt.h> +#include <stddef.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> + +#include "util.h" +#include "def.h" +#include "readahead-common.h" + +unsigned arg_files_max = 16*1024; +off_t arg_file_size_max = READAHEAD_FILE_SIZE_MAX; +usec_t arg_timeout = 2*USEC_PER_MINUTE; + +static int help(void) { + + printf("%s [OPTIONS...] collect [DIRECTORY]\n\n" + "Collect read-ahead data on early boot.\n\n" + " -h --help Show this help\n" + " --max-files=INT Maximum number of files to read ahead\n" + " --file-size-max=BYTES Maximum size of files to read ahead\n" + " --timeout=USEC Maximum time to spend collecting data\n\n\n", + program_invocation_short_name); + + printf("%s [OPTIONS...] replay [DIRECTORY]\n\n" + "Replay collected read-ahead data on early boot.\n\n" + " -h --help Show this help\n" + " --file-size-max=BYTES Maximum size of files to read ahead\n\n\n", + program_invocation_short_name); + + printf("%s [OPTIONS...] analyze [PACK FILE]\n\n" + "Analyze collected read-ahead data.\n\n" + " -h --help Show this help\n", + program_invocation_short_name); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_FILES_MAX = 0x100, + ARG_FILE_SIZE_MAX, + ARG_TIMEOUT + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "files-max", required_argument, NULL, ARG_FILES_MAX }, + { "file-size-max", required_argument, NULL, ARG_FILE_SIZE_MAX }, + { "timeout", required_argument, NULL, ARG_TIMEOUT }, + { NULL, 0, NULL, 0 } + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_FILES_MAX: + if (safe_atou(optarg, &arg_files_max) < 0 || arg_files_max <= 0) { + log_error("Failed to parse maximum number of files %s.", optarg); + return -EINVAL; + } + break; + + case ARG_FILE_SIZE_MAX: { + unsigned long long ull; + + if (safe_atollu(optarg, &ull) < 0 || ull <= 0) { + log_error("Failed to parse maximum file size %s.", optarg); + return -EINVAL; + } + + arg_file_size_max = (off_t) ull; + break; + } + + case ARG_TIMEOUT: + if (parse_usec(optarg, &arg_timeout) < 0 || arg_timeout <= 0) { + log_error("Failed to parse timeout %s.", optarg); + return -EINVAL; + } + + break; + + case '?': + return -EINVAL; + + default: + log_error("Unknown option code %c", c); + return -EINVAL; + } + } + + if (optind != argc-1 && + optind != argc-2) { + help(); + return -EINVAL; + } + + return 1; +} + +int main(int argc, char *argv[]) { + int r; + + log_set_target(LOG_TARGET_SAFE); + log_parse_environment(); + log_open(); + + umask(0022); + + r = parse_argv(argc, argv); + if (r <= 0) + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; + + if (streq(argv[optind], "collect")) + return main_collect(argv[optind+1]); + else if (streq(argv[optind], "replay")) + return main_replay(argv[optind+1]); + else if (streq(argv[optind], "analyze")) + return main_analyze(argv[optind+1]); + + log_error("Unknown verb %s.", argv[optind]); + return EXIT_FAILURE; +} |