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 depends on TOYBOX_FORK 14 help 15 usage: bootchartd {start [PROG ARGS]}|stop|init 16 17 Create /var/log/bootlog.tgz with boot chart data 18 19 start: start background logging; with PROG, run PROG, 20 then kill logging with USR1 21 stop: send USR1 to all bootchartd processes 22 init: start background logging; stop when getty/xdm is seen 23 (for init scripts) 24 25 Under PID 1: as init, then exec $bootchart_init, /init, /sbin/init 26 */ 27 28 #define FOR_bootchartd 29 #include "toys.h" 30 31 GLOBALS( 32 char buf[32]; 33 long smpl_period_usec; 34 int proc_accounting; 35 int is_login; 36 37 void *head; 38 ) 39 40 struct pid_list { 41 struct pid_list *next, *prev; 42 int pid; 43 }; 44 45 static int push_pids_in_list(pid_t pid, char *name) 46 { 47 struct pid_list *new = xzalloc(sizeof(struct pid_list)); 48 49 new->pid = pid; 50 dlist_add_nomalloc((void *)&TT.head, (void *)new); 51 52 return 0; 53 } 54 55 static void dump_data_in_file(char *fname, int wfd) 56 { 57 int rfd = open(fname, O_RDONLY); 58 59 if (rfd != -1) { 60 xwrite(wfd, TT.buf, strlen(TT.buf)); 61 xsendfile(rfd, wfd); 62 close(rfd); 63 xwrite(wfd, "\n", 1); 64 } 65 } 66 67 static int dump_proc_data(FILE *fp) 68 { 69 struct dirent *pid_dir; 70 int login_flag = 0; 71 pid_t pid; 72 DIR *proc_dir = opendir("/proc"); 73 74 fputs(TT.buf, fp); 75 while ((pid_dir = readdir(proc_dir))) { 76 char filename[64]; 77 int fd; 78 79 if (!isdigit(pid_dir->d_name[0])) continue; 80 sscanf(pid_dir->d_name, "%d", &pid); 81 sprintf(filename, "/proc/%d/stat", pid); 82 if ((fd = open(filename, O_RDONLY)) != -1 ) { 83 char *ptr; 84 ssize_t len; 85 86 if ((len = readall(fd, toybuf, sizeof(toybuf)-1)) < 0) { 87 xclose(fd); 88 continue; 89 } 90 toybuf[len] = '\0'; 91 close(fd); 92 fputs(toybuf, fp); 93 if (!TT.is_login) continue; 94 if ((ptr = strchr(toybuf, '('))) { 95 char *tmp = strchr(++ptr, ')'); 96 97 if (tmp) *tmp = '\0'; 98 } 99 // Checks for gdm, kdm or getty 100 if (((ptr[0] == 'g' || ptr[0] == 'k' || ptr[0] == 'x') && ptr[1] == 'd' 101 && ptr[2] == 'm') || strstr(ptr, "getty")) login_flag = 1; 102 } 103 } 104 closedir(proc_dir); 105 fputc('\n', fp); 106 return login_flag; 107 } 108 109 static int parse_config_file(char *fname) 110 { 111 size_t len = 0; 112 char *line = NULL; 113 FILE *fp = fopen(fname, "r"); 114 115 if (!fp) return 0; 116 for (;getline(&line, &len, fp) != -1; line = NULL) { 117 char *ptr = line; 118 119 while (*ptr == ' ' || *ptr == '\t') ptr++; 120 if (!*ptr || *ptr == '#' || *ptr == '\n') continue; 121 if (!strncmp(ptr, "SAMPLE_PERIOD", strlen("SAMPLE_PERIOD"))) { 122 double smpl_val; 123 124 if ((ptr = strchr(ptr, '='))) ptr += 1; 125 else continue; 126 sscanf(ptr, "%lf", &smpl_val); 127 TT.smpl_period_usec = smpl_val * 1000000; 128 if (TT.smpl_period_usec <= 0) TT.smpl_period_usec = 1; 129 } 130 if (!strncmp(ptr, "PROCESS_ACCOUNTING", strlen("PROCESS_ACCOUNTING"))) { 131 if ((ptr = strchr(ptr, '='))) ptr += 1; 132 else continue; 133 sscanf(ptr, "%s", toybuf); // string will come with double quotes. 134 if (!(strncmp(toybuf+1, "on", strlen("on"))) || 135 !(strncmp(toybuf+1, "yes", strlen("yes")))) TT.proc_accounting = 1; 136 } 137 free(line); 138 } 139 fclose(fp); 140 return 1; 141 } 142 143 static char *create_tmp_dir() 144 { 145 char *dir_list[] = {"/tmp", "/mnt", "/boot", "/proc"}, **target = dir_list; 146 char *dir, dir_path[] = "/tmp/bootchart.XXXXXX"; 147 148 if ((dir = mkdtemp(dir_path))) { 149 xchdir((dir = xstrdup(dir))); 150 return dir; 151 } 152 while (mount("none", *target, "tmpfs", (1<<15), "size=16m")) //MS_SILENT 153 if (!++target) perror_exit("can't mount tmpfs"); 154 xchdir(*target); 155 if (umount2(*target, MNT_DETACH)) perror_exit("Can't unmount tmpfs"); 156 return *target; 157 } 158 159 static void start_logging() 160 { 161 int proc_stat_fd = xcreate("proc_stat.log", 162 O_WRONLY | O_CREAT | O_TRUNC, 0644); 163 int proc_diskstats_fd = xcreate("proc_diskstats.log", 164 O_WRONLY | O_CREAT | O_TRUNC, 0644); 165 FILE *proc_ps_fp = xfopen("proc_ps.log", "w"); 166 long tcnt = 60 * 1000 * 1000 / TT.smpl_period_usec; 167 168 if (tcnt <= 0) tcnt = 1; 169 if (TT.proc_accounting) { 170 int kp_fd = xcreate("kernel_procs_acct", O_WRONLY | O_CREAT | O_TRUNC,0666); 171 172 xclose(kp_fd); 173 acct("kernel_procs_acct"); 174 } 175 memset(TT.buf, 0, sizeof(TT.buf)); 176 while (--tcnt && !toys.signal) { 177 int i = 0, j = 0, fd = open("/proc/uptime", O_RDONLY); 178 if (fd < 0) goto wait_usec; 179 char *line = get_line(fd); 180 181 if (!line) goto wait_usec; 182 while (line[i] != ' ') { 183 if (line[i] == '.') { 184 i++; 185 continue; 186 } 187 TT.buf[j++] = line[i++]; 188 } 189 TT.buf[j++] = '\n'; 190 TT.buf[j] = '\0'; 191 free(line); 192 close(fd); 193 dump_data_in_file("/proc/stat", proc_stat_fd); 194 dump_data_in_file("/proc/diskstats", proc_diskstats_fd); 195 // stop proc dumping in 2 secs if getty or gdm, kdm, xdm found 196 if (dump_proc_data(proc_ps_fp)) 197 if (tcnt > 2 * 1000 * 1000 / TT.smpl_period_usec) 198 tcnt = 2 * 1000 * 1000 / TT.smpl_period_usec; 199 fflush(NULL); 200 wait_usec: 201 usleep(TT.smpl_period_usec); 202 } 203 xclose(proc_stat_fd); 204 xclose(proc_diskstats_fd); 205 fclose(proc_ps_fp); 206 } 207 208 static void stop_logging(char *tmp_dir, char *prog) 209 { 210 char host_name[32]; 211 int kcmd_line_fd; 212 time_t t; 213 struct tm st; 214 struct utsname uts; 215 FILE *hdr_fp = xfopen("header", "w"); 216 217 if (TT.proc_accounting) acct(NULL); 218 if (prog) fprintf(hdr_fp, "profile.process = %s\n", prog); 219 gethostname(host_name, sizeof(host_name)); 220 time(&t); 221 localtime_r(&t, &st); 222 memset(toybuf, 0, sizeof(toybuf)); 223 strftime(toybuf, sizeof(toybuf), "%a %b %e %H:%M:%S %Z %Y", &st); 224 fprintf(hdr_fp, "version = TBX_BCHARTD_VER 1.0.0\n"); 225 fprintf(hdr_fp, "title = Boot chart for %s (%s)\n", host_name, toybuf); 226 if (uname(&uts) < 0) perror_exit("uname"); 227 fprintf(hdr_fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release, 228 uts.version, uts.machine); 229 memset(toybuf, 0, sizeof(toybuf)); 230 if ((kcmd_line_fd = open("/proc/cmdline", O_RDONLY)) != -1) { 231 ssize_t len; 232 233 if ((len = readall(kcmd_line_fd, toybuf, sizeof(toybuf)-1)) > 0) { 234 toybuf[len] = 0; 235 while (--len >= 0 && !toybuf[len]) continue; 236 for (; len > 0; len--) if (toybuf[len] < ' ') toybuf[len] = ' '; 237 } else *toybuf = 0; 238 } 239 fprintf(hdr_fp, "system.kernel.options = %s", toybuf); 240 close(kcmd_line_fd); 241 fclose(hdr_fp); 242 memset(toybuf, 0, sizeof(toybuf)); 243 snprintf(toybuf, sizeof(toybuf), "tar -zcf /var/log/bootlog.tgz header %s *.log", 244 TT.proc_accounting ? "kernel_procs_acct" : ""); 245 system(toybuf); 246 if (tmp_dir) { 247 unlink("header"); 248 unlink("proc_stat.log"); 249 unlink("proc_diskstats.log"); 250 unlink("proc_ps.log"); 251 if (TT.proc_accounting) unlink("kernel_procs_acct"); 252 rmdir(tmp_dir); 253 } 254 } 255 256 void bootchartd_main() 257 { 258 pid_t lgr_pid, self_pid = getpid(); 259 int bchartd_opt = 0; // 0=PID1, 1=start, 2=stop, 3=init 260 TT.smpl_period_usec = 200 * 1000; 261 262 TT.is_login = (self_pid == 1); 263 if (*toys.optargs) { 264 if (!strcmp("start", *toys.optargs)) bchartd_opt = 1; 265 else if (!strcmp("stop", *toys.optargs)) bchartd_opt = 2; 266 else if (!strcmp("init", *toys.optargs)) bchartd_opt = 3; 267 else error_exit("Unknown option '%s'", *toys.optargs); 268 269 if (bchartd_opt == 2) { 270 struct pid_list *temp; 271 char *process_name[] = {"bootchartd", NULL}; 272 273 names_to_pid(process_name, push_pids_in_list); 274 temp = TT.head; 275 if (temp) temp->prev->next = 0; 276 for (; temp; temp = temp->next) 277 if (temp->pid != self_pid) kill(temp->pid, SIGUSR1); 278 llist_traverse(TT.head, free); 279 280 return; 281 } 282 } else if (!TT.is_login) error_exit("not PID 1"); 283 284 // Execute the code below for start or init or PID1 285 if (!parse_config_file("bootchartd.conf")) 286 parse_config_file("/etc/bootchartd.conf"); 287 288 memset(toybuf, 0, sizeof(toybuf)); 289 if (!(lgr_pid = xfork())) { 290 char *tmp_dir = create_tmp_dir(); 291 292 sigatexit(generic_signal); 293 raise(SIGSTOP); 294 if (!bchartd_opt && !getenv("PATH")) 295 putenv("PATH=/sbin:/usr/sbin:/bin:/usr/bin"); 296 start_logging(); 297 stop_logging(tmp_dir, bchartd_opt == 1 ? toys.optargs[1] : NULL); 298 return; 299 } 300 waitpid(lgr_pid, NULL, WUNTRACED); 301 kill(lgr_pid, SIGCONT); 302 303 if (!bchartd_opt) { 304 char *pbchart_init = getenv("bootchart_init"); 305 306 if (pbchart_init) execl(pbchart_init, pbchart_init, NULL); 307 execl("/init", "init", (void *)0); 308 execl("/sbin/init", "init", (void *)0); 309 } 310 if (bchartd_opt == 1 && toys.optargs[1]) { 311 pid_t prog_pid; 312 313 if (!(prog_pid = xfork())) xexec(toys.optargs+1); 314 waitpid(prog_pid, NULL, 0); 315 kill(lgr_pid, SIGUSR1); 316 } 317 } 318
