| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <popt.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #include "../cmd.h" |
| 29 | #include "../conf.h" |
| 30 | #include "../utils.h" |
| 31 | |
| 32 | static char *opt_channels; |
| 33 | static char *opt_kernel; |
| 34 | static char *opt_session_name; |
| 35 | static int opt_pid_all; |
| 36 | static int opt_userspace; |
| 37 | static char *opt_cmd_name; |
| 38 | static pid_t opt_pid; |
| 39 | |
| 40 | enum { |
| 41 | OPT_HELP = 1, |
| 42 | OPT_USERSPACE, |
| 43 | }; |
| 44 | |
| 45 | static struct lttng_handle *handle; |
| 46 | |
| 47 | static struct poptOption long_options[] = { |
| 48 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 49 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 50 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, |
| 51 | {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0}, |
| 52 | {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0}, |
| 53 | {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0}, |
| 54 | {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0}, |
| 55 | {0, 0, 0, 0, 0, 0, 0} |
| 56 | }; |
| 57 | |
| 58 | /* |
| 59 | * usage |
| 60 | */ |
| 61 | static void usage(FILE *ofp) |
| 62 | { |
| 63 | fprintf(ofp, "usage: lttng disable-channel NAME[,NAME2,...] [options]\n"); |
| 64 | fprintf(ofp, "\n"); |
| 65 | fprintf(ofp, " -h, --help Show this help\n"); |
| 66 | fprintf(ofp, " -s, --session Apply on session name\n"); |
| 67 | fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n"); |
| 68 | fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n"); |
| 69 | fprintf(ofp, " --all If -u, apply on all traceable apps\n"); |
| 70 | fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n"); |
| 71 | fprintf(ofp, "\n"); |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Disabling channel using the lttng API. |
| 76 | */ |
| 77 | static int disable_channels(char *session_name) |
| 78 | { |
| 79 | int ret = CMD_SUCCESS; |
| 80 | char *channel_name; |
| 81 | struct lttng_domain dom; |
| 82 | |
| 83 | if (opt_kernel) { |
| 84 | dom.type = LTTNG_DOMAIN_KERNEL; |
| 85 | } else if (opt_pid != 0) { |
| 86 | dom.type = LTTNG_DOMAIN_UST_PID; |
| 87 | dom.attr.pid = opt_pid; |
| 88 | DBG("PID %d set to lttng handle", opt_pid); |
| 89 | } else if (opt_userspace && opt_cmd_name == NULL) { |
| 90 | dom.type = LTTNG_DOMAIN_UST; |
| 91 | } else if (opt_userspace && opt_cmd_name != NULL) { |
| 92 | dom.type = LTTNG_DOMAIN_UST_EXEC_NAME; |
| 93 | strncpy(dom.attr.exec_name, opt_cmd_name, NAME_MAX); |
| 94 | } else { |
| 95 | ERR("Please specify a tracer (--kernel or --userspace)"); |
| 96 | ret = CMD_NOT_IMPLEMENTED; |
| 97 | goto error; |
| 98 | } |
| 99 | |
| 100 | handle = lttng_create_handle(session_name, &dom); |
| 101 | if (handle == NULL) { |
| 102 | ret = -1; |
| 103 | goto error; |
| 104 | } |
| 105 | |
| 106 | /* Strip channel list */ |
| 107 | channel_name = strtok(opt_channels, ","); |
| 108 | while (channel_name != NULL) { |
| 109 | DBG("Disabling channel %s", channel_name); |
| 110 | |
| 111 | ret = lttng_disable_channel(handle, channel_name); |
| 112 | if (ret < 0) { |
| 113 | goto error; |
| 114 | } else { |
| 115 | MSG("Channel %s disabled for session %s", channel_name, |
| 116 | session_name); |
| 117 | } |
| 118 | |
| 119 | /* Next channel */ |
| 120 | channel_name = strtok(NULL, ","); |
| 121 | } |
| 122 | |
| 123 | error: |
| 124 | lttng_destroy_handle(handle); |
| 125 | |
| 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * cmd_disable_channels |
| 131 | * |
| 132 | * Disable channel to trace session |
| 133 | */ |
| 134 | int cmd_disable_channels(int argc, const char **argv) |
| 135 | { |
| 136 | int opt, ret; |
| 137 | static poptContext pc; |
| 138 | char *session_name = NULL; |
| 139 | |
| 140 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 141 | poptReadDefaultConfig(pc, 0); |
| 142 | |
| 143 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 144 | switch (opt) { |
| 145 | case OPT_HELP: |
| 146 | usage(stderr); |
| 147 | ret = CMD_SUCCESS; |
| 148 | goto end; |
| 149 | case OPT_USERSPACE: |
| 150 | opt_userspace = 1; |
| 151 | break; |
| 152 | default: |
| 153 | usage(stderr); |
| 154 | ret = CMD_UNDEFINED; |
| 155 | goto end; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | opt_channels = (char*) poptGetArg(pc); |
| 160 | if (opt_channels == NULL) { |
| 161 | ERR("Missing channel name(s).\n"); |
| 162 | usage(stderr); |
| 163 | ret = CMD_SUCCESS; |
| 164 | goto end; |
| 165 | } |
| 166 | |
| 167 | if (!opt_session_name) { |
| 168 | session_name = get_session_name(); |
| 169 | if (session_name == NULL) { |
| 170 | ret = -1; |
| 171 | goto end; |
| 172 | } |
| 173 | } else { |
| 174 | session_name = opt_session_name; |
| 175 | } |
| 176 | |
| 177 | ret = disable_channels(session_name); |
| 178 | |
| 179 | end: |
| 180 | return ret; |
| 181 | } |