| 1 | /* |
| 2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <ctype.h> |
| 22 | #include <limits.h> |
| 23 | |
| 24 | #include <common/error.h> |
| 25 | #include <common/utils.h> |
| 26 | |
| 27 | #include "conf.h" |
| 28 | #include "utils.h" |
| 29 | #include "command.h" |
| 30 | |
| 31 | static const char *str_kernel = "Kernel"; |
| 32 | static const char *str_ust = "UST"; |
| 33 | static const char *str_jul = "JUL"; |
| 34 | |
| 35 | /* |
| 36 | * get_session_name |
| 37 | * |
| 38 | * Return allocated string with the session name found in the config |
| 39 | * directory. |
| 40 | */ |
| 41 | char *get_session_name(void) |
| 42 | { |
| 43 | char *path, *session_name = NULL; |
| 44 | |
| 45 | /* Get path to config file */ |
| 46 | path = utils_get_home_dir(); |
| 47 | if (path == NULL) { |
| 48 | goto error; |
| 49 | } |
| 50 | |
| 51 | /* Get session name from config */ |
| 52 | session_name = config_read_session_name(path); |
| 53 | if (session_name == NULL) { |
| 54 | goto error; |
| 55 | } |
| 56 | |
| 57 | DBG2("Config file path found: %s", path); |
| 58 | DBG("Session name found: %s", session_name); |
| 59 | return session_name; |
| 60 | |
| 61 | error: |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * list_commands |
| 67 | * |
| 68 | * List commands line by line. This is mostly for bash auto completion and to |
| 69 | * avoid difficult parsing. |
| 70 | */ |
| 71 | void list_commands(struct cmd_struct *commands, FILE *ofp) |
| 72 | { |
| 73 | int i = 0; |
| 74 | struct cmd_struct *cmd = NULL; |
| 75 | |
| 76 | cmd = &commands[i]; |
| 77 | while (cmd->name != NULL) { |
| 78 | fprintf(ofp, "%s\n", cmd->name); |
| 79 | i++; |
| 80 | cmd = &commands[i]; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /* |
| 85 | * list_cmd_options |
| 86 | * |
| 87 | * Prints a simple list of the options available to a command. This is intended |
| 88 | * to be easily parsed for bash completion. |
| 89 | */ |
| 90 | void list_cmd_options(FILE *ofp, struct poptOption *options) |
| 91 | { |
| 92 | int i; |
| 93 | struct poptOption *option = NULL; |
| 94 | |
| 95 | for (i = 0; options[i].longName != NULL; i++) { |
| 96 | option = &options[i]; |
| 97 | |
| 98 | fprintf(ofp, "--%s\n", option->longName); |
| 99 | |
| 100 | if (isprint(option->shortName)) { |
| 101 | fprintf(ofp, "-%c\n", option->shortName); |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * fls: returns the position of the most significant bit. |
| 108 | * Returns 0 if no bit is set, else returns the position of the most |
| 109 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). |
| 110 | */ |
| 111 | #if defined(__i386) || defined(__x86_64) |
| 112 | static inline |
| 113 | unsigned int fls_u32(uint32_t x) |
| 114 | { |
| 115 | int r; |
| 116 | |
| 117 | asm("bsrl %1,%0\n\t" |
| 118 | "jnz 1f\n\t" |
| 119 | "movl $-1,%0\n\t" |
| 120 | "1:\n\t" |
| 121 | : "=r" (r) : "rm" (x)); |
| 122 | return r + 1; |
| 123 | } |
| 124 | #define HAS_FLS_U32 |
| 125 | #endif |
| 126 | |
| 127 | #if defined(__x86_64) |
| 128 | static inline |
| 129 | unsigned int fls_u64(uint64_t x) |
| 130 | { |
| 131 | long r; |
| 132 | |
| 133 | asm("bsrq %1,%0\n\t" |
| 134 | "jnz 1f\n\t" |
| 135 | "movq $-1,%0\n\t" |
| 136 | "1:\n\t" |
| 137 | : "=r" (r) : "rm" (x)); |
| 138 | return r + 1; |
| 139 | } |
| 140 | #define HAS_FLS_U64 |
| 141 | #endif |
| 142 | |
| 143 | #ifndef HAS_FLS_U64 |
| 144 | static __attribute__((unused)) |
| 145 | unsigned int fls_u64(uint64_t x) |
| 146 | { |
| 147 | unsigned int r = 64; |
| 148 | |
| 149 | if (!x) |
| 150 | return 0; |
| 151 | |
| 152 | if (!(x & 0xFFFFFFFF00000000ULL)) { |
| 153 | x <<= 32; |
| 154 | r -= 32; |
| 155 | } |
| 156 | if (!(x & 0xFFFF000000000000ULL)) { |
| 157 | x <<= 16; |
| 158 | r -= 16; |
| 159 | } |
| 160 | if (!(x & 0xFF00000000000000ULL)) { |
| 161 | x <<= 8; |
| 162 | r -= 8; |
| 163 | } |
| 164 | if (!(x & 0xF000000000000000ULL)) { |
| 165 | x <<= 4; |
| 166 | r -= 4; |
| 167 | } |
| 168 | if (!(x & 0xC000000000000000ULL)) { |
| 169 | x <<= 2; |
| 170 | r -= 2; |
| 171 | } |
| 172 | if (!(x & 0x8000000000000000ULL)) { |
| 173 | x <<= 1; |
| 174 | r -= 1; |
| 175 | } |
| 176 | return r; |
| 177 | } |
| 178 | #endif |
| 179 | |
| 180 | #ifndef HAS_FLS_U32 |
| 181 | static __attribute__((unused)) |
| 182 | unsigned int fls_u32(uint32_t x) |
| 183 | { |
| 184 | unsigned int r = 32; |
| 185 | |
| 186 | if (!x) |
| 187 | return 0; |
| 188 | if (!(x & 0xFFFF0000U)) { |
| 189 | x <<= 16; |
| 190 | r -= 16; |
| 191 | } |
| 192 | if (!(x & 0xFF000000U)) { |
| 193 | x <<= 8; |
| 194 | r -= 8; |
| 195 | } |
| 196 | if (!(x & 0xF0000000U)) { |
| 197 | x <<= 4; |
| 198 | r -= 4; |
| 199 | } |
| 200 | if (!(x & 0xC0000000U)) { |
| 201 | x <<= 2; |
| 202 | r -= 2; |
| 203 | } |
| 204 | if (!(x & 0x80000000U)) { |
| 205 | x <<= 1; |
| 206 | r -= 1; |
| 207 | } |
| 208 | return r; |
| 209 | } |
| 210 | #endif |
| 211 | |
| 212 | static |
| 213 | unsigned int fls_ulong(unsigned long x) |
| 214 | { |
| 215 | #if (CAA_BITS_PER_LONG == 32) |
| 216 | return fls_u32(x); |
| 217 | #else |
| 218 | return fls_u64(x); |
| 219 | #endif |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Return the minimum order for which x <= (1UL << order). |
| 224 | * Return -1 if x is 0. |
| 225 | */ |
| 226 | int get_count_order_u32(uint32_t x) |
| 227 | { |
| 228 | if (!x) |
| 229 | return -1; |
| 230 | |
| 231 | return fls_u32(x - 1); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Return the minimum order for which x <= (1UL << order). |
| 236 | * Return -1 if x is 0. |
| 237 | */ |
| 238 | int get_count_order_u64(uint64_t x) |
| 239 | { |
| 240 | if (!x) |
| 241 | return -1; |
| 242 | |
| 243 | return fls_u64(x - 1); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Return the minimum order for which x <= (1UL << order). |
| 248 | * Return -1 if x is 0. |
| 249 | */ |
| 250 | int get_count_order_ulong(unsigned long x) |
| 251 | { |
| 252 | if (!x) |
| 253 | return -1; |
| 254 | |
| 255 | return fls_ulong(x - 1); |
| 256 | } |
| 257 | |
| 258 | const char *get_domain_str(enum lttng_domain_type domain) |
| 259 | { |
| 260 | const char *str_dom; |
| 261 | |
| 262 | switch (domain) { |
| 263 | case LTTNG_DOMAIN_KERNEL: |
| 264 | str_dom = str_kernel; |
| 265 | break; |
| 266 | case LTTNG_DOMAIN_UST: |
| 267 | str_dom = str_ust; |
| 268 | break; |
| 269 | case LTTNG_DOMAIN_JUL: |
| 270 | str_dom = str_jul; |
| 271 | break; |
| 272 | default: |
| 273 | /* Should not have an unknown domain or else define it. */ |
| 274 | assert(0); |
| 275 | } |
| 276 | |
| 277 | return str_dom; |
| 278 | } |