1 /* bootchartd.c - bootchartd is commonly used to profile the boot process. 2 * 3 * Copyright 2014 Bilal Qureshi <bilal.jmi (at) gmail.com> 4 * Copyright 2014 Kyungwan Han <asura321 (at) gmail.com> 5 * 6 * No Standard 7 8 USE_BOOTCHARTD(NEWTOY(bootchartd, 0, TOYFLAG_STAYROOT|TOYFLAG_USR|TOYFLAG_BIN)) 9 10 config BOOTCHARTD 11 bool "bootchartd" 12 default n 13 help 14 usage: bootchartd {start [PROG ARGS]}|stop|init 15 16 Create /var/log/bootlog.tgz with boot chart data 17 18 start: start background logging; with PROG, run PROG, 19 then kill logging with USR1 20 stop: send USR1 to all bootchartd processes 21 init: start background logging; stop when getty/xdm is seen 22 (for init scripts) 23 24 Under PID 1: as init, then exec $bootchart_init, /init, /sbin/init 25 */ 26 27 #define FOR_bootchartd 28 #include "toys.h" 29 30 GLOBALS( 31 char buf[32]; 32 long smpl_period_usec; 33 int proc_accounting; 34 int is_login; 35 36 void *head; 37 ) 38 39 struct pid_list { 40 struct pid_list *next, *prev; 41 int pid; 42 }; 43 44 static int push_pids_in_list(pid_t pid, char *name) 45 { 46 struct pid_list *new = xzalloc(sizeof(struct pid_list)); 47 48 new->pid = pid; 49 dlist_add_nomalloc((void *)&TT.head, (void *)new); 50 51 return 0; 52 } 53 54 static void dump_data_in_file(char *fname, int wfd) 55 { 56 int rfd = open(fname, O_RDONLY); 57 58 if (rfd != -1) { 59 xwrite(wfd, TT.buf, strlen(TT.buf)); 60 xsendfile(rfd, wfd); 61 close(rfd); 62 xwrite(wfd, "\n", 1); 63 } 64 } 65 66 static int dump_proc_data(FILE *fp) 67 { 68 struct dirent *pid_dir; 69 int login_flag = 0; 70 pid_t pid; 71 DIR *proc_dir = opendir("/proc"); 72 73 fputs(TT.buf, fp); 74 while ((pid_dir = readdir(proc_dir))) { 75 char filename[64]; 76 int fd; 77 78 if (!isdigit(pid_dir->d_name[0])) continue; 79 sscanf(pid_dir->d_name, "%d", &pid); 80 sprintf(filename, "/proc/%d/stat", pid); 81 if ((fd = open(filename, O_RDONLY)) != -1 ) { 82 char *ptr; 83 ssize_t len; 84 85 if ((len = readall(fd, toybuf, sizeof(toybuf)-1)) < 0) { 86 xclose(fd); 87 continue; 88 } 89 toybuf[len] = '\0'; 90 close(fd); 91 fputs(toybuf, fp); 92 if (!TT.is_login) continue; 93 if ((ptr = strchr(toybuf, '('))) { 94 char *tmp = strchr(++ptr, ')'); 95 96 if (tmp) *tmp = '\0'; 97 } 98 // Checks for gdm, kdm or getty 99 if (((ptr[0] == 'g' || ptr[0] == 'k' || ptr[0] == 'x') && ptr[1] == 'd' 100 && ptr[2] == 'm') || strstr(ptr, "getty")) login_flag = 1; 101 } 102 } 103 closedir(proc_dir); 104 fputc('\n', fp); 105 return login_flag; 106 } 107 108 static int parse_config_file(char *fname) 109 { 110 size_t len = 0; 111 char *line = NULL; 112 FILE *fp = fopen(fname, "r"); 113 114 if (!fp) return 0; 115 for (;getline(&line, &len, fp) != -1; line = NULL) { 116 char *ptr = line; 117 118 while (*ptr == ' ' || *ptr == '\t') ptr++; 119 if (!*ptr || *ptr == '#' || *ptr == '\n') continue; 120 if (!strncmp(ptr, "SAMPLE_PERIOD", strlen("SAMPLE_PERIOD"))) { 121 double smpl_val; 122 123 if ((ptr = strchr(ptr, '='))) ptr += 1; 124 else continue; 125 sscanf(ptr, "%lf", &smpl_val); 126 TT.smpl_period_usec = smpl_val * 1000000; 127 if (TT.smpl_period_usec <= 0) TT.smpl_period_usec = 1; 128 } 129 if (!strncmp(ptr, "PROCESS_ACCOUNTING", strlen("PROCESS_ACCOUNTING"))) { 130 if ((ptr = strchr(ptr, '='))) ptr += 1; 131 else continue; 132 sscanf(ptr, "%s", toybuf); // string will come with double quotes. 133 if (!(strncmp(toybuf+1, "on", strlen("on"))) || 134 !(strncmp(toybuf+1, "yes", strlen("yes")))) TT.proc_accounting = 1; 135 } 136 free(line); 137 } 138 fclose(fp); 139 return 1; 140 } 141 142 static char *create_tmp_dir() 143 { 144 char *dir_list[] = {"/tmp", "/mnt", "/boot", "/proc"}, **target = dir_list; 145 char *dir, dir_path[] = "/tmp/bootchart.XXXXXX"; 146 147 if ((dir = mkdtemp(dir_path))) { 148 xchdir((dir = xstrdup(dir))); 149 return dir; 150 } 151 while (mount("none", *target, "tmpfs", (1<<15), "size=16m")) //MS_SILENT 152 if (!++target) perror_exit("can't mount tmpfs"); 153 xchdir(*target); 154 if (umount2(*target, MNT_DETACH)) perror_exit("Can't unmount tmpfs"); 155 return *target; 156 } 157 158 static void start_logging() 159 { 160 int proc_stat_fd = xcreate("proc_stat.log", 161 O_WRONLY | O_CREAT | O_TRUNC, 0644); 162 int proc_diskstats_fd = xcreate("proc_diskstats.log", 163 O_WRONLY | O_CREAT | O_TRUNC, 0644); 164 FILE *proc_ps_fp = xfopen("proc_ps.log", "w"); 165 long tcnt = 60 * 1000 * 1000 / TT.smpl_period_usec; 166 167 if (tcnt <= 0) tcnt = 1; 168 if (TT.proc_accounting) { 169 int kp_fd = xcreate("kernel_procs_acct", O_WRONLY | O_CREAT | O_TRUNC,0666); 170 171 xclose(kp_fd); 172 acct("kernel_procs_acct"); 173 } 174 memset(TT.buf, 0, sizeof(TT.buf)); 175 while (--tcnt && !toys.signal) { 176 int i = 0, j = 0, fd = open("/proc/uptime", O_RDONLY); 177 if (fd < 0) goto wait_usec; 178 char *line = get_line(fd); 179 180 if (!line) goto wait_usec; 181 while (line[i] != ' ') { 182 if (line[i] == '.') { 183 i++; 184 continue; 185 } 186 TT.buf[j++] = line[i++]; 187 } 188 TT.buf[j++] = '\n'; 189 TT.buf[j] = '\0'; 190 free(line); 191 close(fd); 192 dump_data_in_file("/proc/stat", proc_stat_fd); 193 dump_data_in_file("/proc/diskstats", proc_diskstats_fd); 194 // stop proc dumping in 2 secs if getty or gdm, kdm, xdm found 195 if (dump_proc_data(proc_ps_fp)) 196 if (tcnt > 2 * 1000 * 1000 / TT.smpl_period_usec) 197 tcnt = 2 * 1000 * 1000 / TT.smpl_period_usec; 198 fflush(NULL); 199 wait_usec: 200 usleep(TT.smpl_period_usec); 201 } 202 xclose(proc_stat_fd); 203 xclose(proc_diskstats_fd); 204 fclose(proc_ps_fp); 205 } 206 207 static void stop_logging(char *tmp_dir, char *prog) 208 { 209 char host_name[32]; 210 int kcmd_line_fd; 211 time_t t; 212 struct tm st; 213 struct utsname uts; 214 FILE *hdr_fp = xfopen("header", "w"); 215 216 if (TT.proc_accounting) acct(NULL); 217 if (prog) fprintf(hdr_fp, "profile.process = %s\n", prog); 218 gethostname(host_name, sizeof(host_name)); 219 time(&t); 220 localtime_r(&t, &st); 221 memset(toybuf, 0, sizeof(toybuf)); 222 strftime(toybuf, sizeof(toybuf), "%a %b %e %H:%M:%S %Z %Y", &st); 223 fprintf(hdr_fp, "version = TBX_BCHARTD_VER 1.0.0\n"); 224 fprintf(hdr_fp, "title = Boot chart for %s (%s)\n", host_name, toybuf); 225 if (uname(&uts) < 0) perror_exit("uname"); 226 fprintf(hdr_fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, 227 uts.version, uts.machine); 228 memset(toybuf, 0, sizeof(toybuf)); 229 if ((kcmd_line_fd = open("/proc/cmdline", O_RDONLY)) != -1) { 230 ssize_t len; 231 232 if ((len = readall(kcmd_line_fd, toybuf, sizeof(toybuf)-1)) > 0) { 233 toybuf[len] = 0; 234 while (--len >= 0 && !toybuf[len]) continue; 235 for (; len > 0; len--) if (toybuf[len] < ' ') toybuf[len] = ' '; 236 } else *toybuf = 0; 237 } 238 fprintf(hdr_fp, "system.kernel.options = %s", toybuf); 239 close(kcmd_line_fd); 240 fclose(hdr_fp); 241 memset(toybuf, 0, sizeof(toybuf)); 242 snprintf(toybuf, sizeof(toybuf), "tar -zcf /var/log/bootlog.tgz header %s *.log", 243 TT.proc_accounting ? "kernel_procs_acct" : ""); 244 system(toybuf); 245 if (tmp_dir) { 246 unlink("header"); 247 unlink("proc_stat.log"); 248 unlink("proc_diskstats.log"); 249 unlink("proc_ps.log"); 250 if (TT.proc_accounting) unlink("kernel_procs_acct"); 251 rmdir(tmp_dir); 252 } 253 } 254 255 void bootchartd_main() 256 { 257 pid_t lgr_pid, self_pid = getpid(); 258 int bchartd_opt = 0; // 0=PID1, 1=start, 2=stop, 3=init 259 TT.smpl_period_usec = 200 * 1000; 260 261 TT.is_login = (self_pid == 1); 262 if (*toys.optargs) { 263 if (!strcmp("start", *toys.optargs)) bchartd_opt = 1; 264 else if (!strcmp("stop", *toys.optargs)) bchartd_opt = 2; 265 else if (!strcmp("init", *toys.optargs)) bchartd_opt = 3; 266 else error_exit("Unknown option '%s'", *toys.optargs); 267 268 if (bchartd_opt == 2) { 269 struct pid_list *temp; 270 char *process_name[] = {"bootchartd", NULL}; 271 272 names_to_pid(process_name, push_pids_in_list); 273 temp = TT.head; 274 if (temp) temp->prev->next = 0; 275 for (; temp; temp = temp->next) 276 if (temp->pid != self_pid) kill(temp->pid, SIGUSR1); 277 llist_traverse(TT.head, free); 278 279 return; 280 } 281 } else if (!TT.is_login) error_exit("not PID 1"); 282 283 // Execute the code below for start or init or PID1 284 if (!parse_config_file("bootchartd.conf")) 285 parse_config_file("/etc/bootchartd.conf"); 286 287 memset(toybuf, 0, sizeof(toybuf)); 288 if (!(lgr_pid = xfork())) { 289 char *tmp_dir = create_tmp_dir(); 290 291 sigatexit(generic_signal); 292 raise(SIGSTOP); 293 if (!bchartd_opt && !getenv("PATH")) 294 putenv("PATH=/sbin:/usr/sbin:/bin:/usr/bin"); 295 start_logging(); 296 stop_logging(tmp_dir, bchartd_opt == 1 ? toys.optargs[1] : NULL); 297 return; 298 } 299 waitpid(lgr_pid, NULL, WUNTRACED); 300 kill(lgr_pid, SIGCONT); 301 302 if (!bchartd_opt) { 303 char *pbchart_init = getenv("bootchart_init"); 304 305 if (pbchart_init) execl(pbchart_init, pbchart_init, NULL); 306 execl("/init", "init", (void *)0); 307 execl("/sbin/init", "init", (void *)0); 308 } 309 if (bchartd_opt == 1 && toys.optargs[1]) { 310 pid_t prog_pid; 311 312 if (!(prog_pid = xfork())) xexec(toys.optargs+1); 313 waitpid(prog_pid, NULL, 0); 314 kill(lgr_pid, SIGUSR1); 315 } 316 } 317
