1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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4 | */
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5 |
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6 | //applet:IF_BOOTCHARTD(APPLET(bootchartd, BB_DIR_SBIN, BB_SUID_DROP))
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7 |
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8 | //kbuild:lib-$(CONFIG_BOOTCHARTD) += bootchartd.o
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9 |
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10 | //config:config BOOTCHARTD
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11 | //config: bool "bootchartd"
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12 | //config: default y
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13 | //config: help
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14 | //config: bootchartd is commonly used to profile the boot process
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15 | //config: for the purpose of speeding it up. In this case, it is started
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16 | //config: by the kernel as the init process. This is configured by adding
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17 | //config: the init=/sbin/bootchartd option to the kernel command line.
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18 | //config:
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19 | //config: It can also be used to monitor the resource usage of a specific
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20 | //config: application or the running system in general. In this case,
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21 | //config: bootchartd is started interactively by running bootchartd start
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22 | //config: and stopped using bootchartd stop.
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23 | //config:
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24 | //config:config FEATURE_BOOTCHARTD_BLOATED_HEADER
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25 | //config: bool "Compatible, bloated header"
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26 | //config: default y
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27 | //config: depends on BOOTCHARTD
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28 | //config: help
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29 | //config: Create extended header file compatible with "big" bootchartd.
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30 | //config: "Big" bootchartd is a shell script and it dumps some
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31 | //config: "convenient" info int the header, such as:
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32 | //config: title = Boot chart for `hostname` (`date`)
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33 | //config: system.uname = `uname -srvm`
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34 | //config: system.release = `cat /etc/DISTRO-release`
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35 | //config: system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
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36 | //config: system.kernel.options = `cat /proc/cmdline`
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37 | //config: This data is not mandatory for bootchart graph generation,
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38 | //config: and is considered bloat. Nevertheless, this option
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39 | //config: makes bootchartd applet to dump a subset of it.
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40 | //config:
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41 | //config:config FEATURE_BOOTCHARTD_CONFIG_FILE
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42 | //config: bool "Support bootchartd.conf"
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43 | //config: default y
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44 | //config: depends on BOOTCHARTD
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45 | //config: help
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46 | //config: Enable reading and parsing of $PWD/bootchartd.conf
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47 | //config: and /etc/bootchartd.conf files.
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48 |
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49 | #include "libbb.h"
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50 | /* After libbb.h, since it needs sys/types.h on some systems */
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51 | #include <sys/utsname.h>
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52 |
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53 | #ifdef __linux__
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54 | # include <sys/mount.h>
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55 | # ifndef MS_SILENT
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56 | # define MS_SILENT (1 << 15)
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57 | # endif
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58 | # ifndef MNT_DETACH
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59 | # define MNT_DETACH 0x00000002
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60 | # endif
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61 | #endif
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62 |
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63 | #define BC_VERSION_STR "0.8"
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64 |
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65 | /* For debugging, set to 0:
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66 | * strace won't work with DO_SIGNAL_SYNC set to 1.
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67 | */
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68 | #define DO_SIGNAL_SYNC 1
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69 |
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70 |
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71 | //$PWD/bootchartd.conf and /etc/bootchartd.conf:
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72 | //supported options:
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73 | //# Sampling period (in seconds)
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74 | //SAMPLE_PERIOD=0.2
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75 | //
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76 | //not yet supported:
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77 | //# tmpfs size
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78 | //# (32 MB should suffice for ~20 minutes worth of log data, but YMMV)
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79 | //TMPFS_SIZE=32m
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80 | //
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81 | //# Whether to enable and store BSD process accounting information. The
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82 | //# kernel needs to be configured to enable v3 accounting
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83 | //# (CONFIG_BSD_PROCESS_ACCT_V3). accton from the GNU accounting utilities
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84 | //# is also required.
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85 | //PROCESS_ACCOUNTING="no"
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86 | //
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87 | //# Tarball for the various boot log files
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88 | //BOOTLOG_DEST=/var/log/bootchart.tgz
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89 | //
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90 | //# Whether to automatically stop logging as the boot process completes.
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91 | //# The logger will look for known processes that indicate bootup completion
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92 | //# at a specific runlevel (e.g. gdm-binary, mingetty, etc.).
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93 | //AUTO_STOP_LOGGER="yes"
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94 | //
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95 | //# Whether to automatically generate the boot chart once the boot logger
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96 | //# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
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97 | //# Note that the bootchart package must be installed.
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98 | //AUTO_RENDER="no"
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99 | //
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100 | //# Image format to use for the auto-generated boot chart
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101 | //# (choose between png, svg and eps).
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102 | //AUTO_RENDER_FORMAT="png"
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103 | //
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104 | //# Output directory for auto-generated boot charts
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105 | //AUTO_RENDER_DIR="/var/log"
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106 |
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107 |
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108 | /* Globals */
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109 | struct globals {
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110 | char jiffy_line[COMMON_BUFSIZE];
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111 | } FIX_ALIASING;
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112 | #define G (*(struct globals*)&bb_common_bufsiz1)
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113 | #define INIT_G() do { } while (0)
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114 |
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115 | static void dump_file(FILE *fp, const char *filename)
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116 | {
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117 | int fd = open(filename, O_RDONLY);
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118 | if (fd >= 0) {
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119 | fputs(G.jiffy_line, fp);
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120 | fflush(fp);
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121 | bb_copyfd_eof(fd, fileno(fp));
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122 | close(fd);
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123 | fputc('\n', fp);
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124 | }
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125 | }
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126 |
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127 | static int dump_procs(FILE *fp, int look_for_login_process)
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128 | {
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129 | struct dirent *entry;
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130 | DIR *dir = opendir("/proc");
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131 | int found_login_process = 0;
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132 |
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133 | fputs(G.jiffy_line, fp);
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134 | while ((entry = readdir(dir)) != NULL) {
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135 | char name[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
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136 | int stat_fd;
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137 | unsigned pid = bb_strtou(entry->d_name, NULL, 10);
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138 | if (errno)
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139 | continue;
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140 |
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141 | /* Android's version reads /proc/PID/cmdline and extracts
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142 | * non-truncated process name. Do we want to do that? */
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143 |
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144 | sprintf(name, "/proc/%u/stat", pid);
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145 | stat_fd = open(name, O_RDONLY);
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146 | if (stat_fd >= 0) {
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147 | char *p;
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148 | char stat_line[4*1024];
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149 | int rd = safe_read(stat_fd, stat_line, sizeof(stat_line)-2);
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150 |
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151 | close(stat_fd);
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152 | if (rd < 0)
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153 | continue;
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154 | stat_line[rd] = '\0';
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155 | p = strchrnul(stat_line, '\n');
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156 | *p++ = '\n';
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157 | *p = '\0';
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158 | fputs(stat_line, fp);
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159 | if (!look_for_login_process)
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160 | continue;
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161 | p = strchr(stat_line, '(');
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162 | if (!p)
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163 | continue;
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164 | p++;
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165 | strchrnul(p, ')')[0] = '\0';
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166 | /* Is it gdm, kdm or a getty? */
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167 | if (((p[0] == 'g' || p[0] == 'k' || p[0] == 'x') && p[1] == 'd' && p[2] == 'm')
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168 | || strstr(p, "getty")
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169 | ) {
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170 | found_login_process = 1;
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171 | }
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172 | }
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173 | }
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174 | closedir(dir);
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175 | fputc('\n', fp);
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176 | return found_login_process;
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177 | }
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178 |
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179 | static char *make_tempdir(void)
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180 | {
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181 | char template[] = "/tmp/bootchart.XXXXXX";
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182 | char *tempdir = xstrdup(mkdtemp(template));
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183 | if (!tempdir) {
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184 | #ifdef __linux__
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185 | /* /tmp is not writable (happens when we are used as init).
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186 | * Try to mount a tmpfs, them cd and lazily unmount it.
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187 | * Since we unmount it at once, we can mount it anywhere.
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188 | * Try a few locations which are likely ti exist.
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189 | */
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190 | static const char dirs[] = "/mnt\0""/tmp\0""/boot\0""/proc\0";
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191 | const char *try_dir = dirs;
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192 | while (mount("none", try_dir, "tmpfs", MS_SILENT, "size=16m") != 0) {
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193 | try_dir += strlen(try_dir) + 1;
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194 | if (!try_dir[0])
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195 | bb_perror_msg_and_die("can't %smount tmpfs", "");
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196 | }
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197 | //bb_error_msg("mounted tmpfs on %s", try_dir);
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198 | xchdir(try_dir);
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199 | if (umount2(try_dir, MNT_DETACH) != 0) {
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200 | bb_perror_msg_and_die("can't %smount tmpfs", "un");
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201 | }
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202 | #else
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203 | bb_perror_msg_and_die("can't create temporary directory");
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204 | #endif
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205 | } else {
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206 | xchdir(tempdir);
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207 | }
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208 | return tempdir;
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209 | }
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210 |
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211 | static void do_logging(unsigned sample_period_us, int process_accounting)
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212 | {
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213 | FILE *proc_stat = xfopen("proc_stat.log", "w");
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214 | FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
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215 | //FILE *proc_netdev = xfopen("proc_netdev.log", "w");
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216 | FILE *proc_ps = xfopen("proc_ps.log", "w");
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217 | int look_for_login_process = (getppid() == 1);
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218 | unsigned count = 60*1000*1000 / sample_period_us; /* ~1 minute */
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219 |
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220 | if (process_accounting) {
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221 | close(xopen("kernel_pacct", O_WRONLY | O_CREAT | O_TRUNC));
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222 | acct("kernel_pacct");
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223 | }
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224 |
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225 | while (--count && !bb_got_signal) {
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226 | char *p;
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227 | int len = open_read_close("/proc/uptime", G.jiffy_line, sizeof(G.jiffy_line)-2);
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228 | if (len < 0)
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229 | goto wait_more;
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230 | /* /proc/uptime has format "NNNNNN.MM NNNNNNN.MM" */
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231 | /* we convert it to "NNNNNNMM\n" (using first value) */
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232 | G.jiffy_line[len] = '\0';
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233 | p = strchr(G.jiffy_line, '.');
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234 | if (!p)
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235 | goto wait_more;
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236 | while (isdigit(*++p))
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237 | p[-1] = *p;
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238 | p[-1] = '\n';
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239 | p[0] = '\0';
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240 |
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241 | dump_file(proc_stat, "/proc/stat");
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242 | dump_file(proc_diskstats, "/proc/diskstats");
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243 | //dump_file(proc_netdev, "/proc/net/dev");
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244 | if (dump_procs(proc_ps, look_for_login_process)) {
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245 | /* dump_procs saw a getty or {g,k,x}dm
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246 | * stop logging in 2 seconds:
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247 | */
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248 | if (count > 2*1000*1000 / sample_period_us)
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249 | count = 2*1000*1000 / sample_period_us;
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250 | }
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251 | fflush_all();
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252 | wait_more:
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253 | usleep(sample_period_us);
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254 | }
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255 | }
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256 |
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257 | static void finalize(char *tempdir, const char *prog, int process_accounting)
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258 | {
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259 | //# Stop process accounting if configured
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260 | //local pacct=
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261 | //[ -e kernel_pacct ] && pacct=kernel_pacct
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262 |
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263 | FILE *header_fp = xfopen("header", "w");
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264 |
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265 | if (process_accounting)
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266 | acct(NULL);
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267 |
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268 | if (prog)
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269 | fprintf(header_fp, "profile.process = %s\n", prog);
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270 |
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271 | fputs("version = "BC_VERSION_STR"\n", header_fp);
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272 | if (ENABLE_FEATURE_BOOTCHARTD_BLOATED_HEADER) {
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273 | char *hostname;
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274 | char *kcmdline;
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275 | time_t t;
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276 | struct tm tm_time;
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277 | /* x2 for possible localized weekday/month names */
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278 | char date_buf[sizeof("Mon Jun 21 05:29:03 CEST 2010") * 2];
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279 | struct utsname unamebuf;
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280 |
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281 | hostname = safe_gethostname();
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282 | time(&t);
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283 | localtime_r(&t, &tm_time);
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284 | strftime(date_buf, sizeof(date_buf), "%a %b %e %H:%M:%S %Z %Y", &tm_time);
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285 | fprintf(header_fp, "title = Boot chart for %s (%s)\n", hostname, date_buf);
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286 | if (ENABLE_FEATURE_CLEAN_UP)
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287 | free(hostname);
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288 |
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289 | uname(&unamebuf); /* never fails */
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290 | /* same as uname -srvm */
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291 | fprintf(header_fp, "system.uname = %s %s %s %s\n",
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292 | unamebuf.sysname,
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293 | unamebuf.release,
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294 | unamebuf.version,
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295 | unamebuf.machine
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296 | );
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297 |
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298 | //system.release = `cat /etc/DISTRO-release`
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299 | //system.cpu = `grep '^model name' /proc/cpuinfo | head -1` ($cpucount)
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300 |
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301 | kcmdline = xmalloc_open_read_close("/proc/cmdline", NULL);
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302 | /* kcmdline includes trailing "\n" */
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303 | fprintf(header_fp, "system.kernel.options = %s", kcmdline);
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304 | if (ENABLE_FEATURE_CLEAN_UP)
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305 | free(kcmdline);
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306 | }
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307 | fclose(header_fp);
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308 |
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309 | /* Package log files */
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310 | system(xasprintf("tar -zcf /var/log/bootlog.tgz header %s *.log", process_accounting ? "kernel_pacct" : ""));
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311 | /* Clean up (if we are not in detached tmpfs) */
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312 | if (tempdir) {
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313 | unlink("header");
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314 | unlink("proc_stat.log");
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315 | unlink("proc_diskstats.log");
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316 | //unlink("proc_netdev.log");
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317 | unlink("proc_ps.log");
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318 | if (process_accounting)
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319 | unlink("kernel_pacct");
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320 | rmdir(tempdir);
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321 | }
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322 |
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323 | /* shell-based bootchartd tries to run /usr/bin/bootchart if $AUTO_RENDER=yes:
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324 | * /usr/bin/bootchart -o "$AUTO_RENDER_DIR" -f $AUTO_RENDER_FORMAT "$BOOTLOG_DEST"
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325 | */
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326 | }
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327 |
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328 | //usage:#define bootchartd_trivial_usage
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329 | //usage: "start [PROG ARGS]|stop|init"
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330 | //usage:#define bootchartd_full_usage "\n\n"
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331 | //usage: "Create /var/log/bootchart.tgz with boot chart data\n"
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332 | //usage: "\nstart: start background logging; with PROG, run PROG, then kill logging with USR1"
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333 | //usage: "\nstop: send USR1 to all bootchartd processes"
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334 | //usage: "\ninit: start background logging; stop when getty/xdm is seen (for init scripts)"
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335 | //usage: "\nUnder PID 1: as init, then exec $bootchart_init, /init, /sbin/init"
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336 |
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337 | int bootchartd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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338 | int bootchartd_main(int argc UNUSED_PARAM, char **argv)
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339 | {
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340 | unsigned sample_period_us;
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341 | pid_t parent_pid, logger_pid;
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342 | smallint cmd;
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343 | int process_accounting;
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344 | enum {
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345 | CMD_STOP = 0,
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346 | CMD_START,
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347 | CMD_INIT,
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348 | CMD_PID1, /* used to mark pid 1 case */
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349 | };
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350 |
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351 | INIT_G();
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352 |
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353 | parent_pid = getpid();
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354 | if (argv[1]) {
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355 | cmd = index_in_strings("stop\0""start\0""init\0", argv[1]);
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356 | if (cmd < 0)
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357 | bb_show_usage();
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358 | if (cmd == CMD_STOP) {
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359 | pid_t *pidList = find_pid_by_name("bootchartd");
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360 | while (*pidList != 0) {
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361 | if (*pidList != parent_pid)
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362 | kill(*pidList, SIGUSR1);
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363 | pidList++;
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364 | }
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365 | return EXIT_SUCCESS;
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366 | }
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367 | } else {
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368 | if (parent_pid != 1)
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369 | bb_show_usage();
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370 | cmd = CMD_PID1;
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371 | }
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372 |
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373 | /* Here we are in START, INIT or CMD_PID1 state */
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374 |
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375 | /* Read config file: */
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376 | sample_period_us = 200 * 1000;
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377 | process_accounting = 0;
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378 | if (ENABLE_FEATURE_BOOTCHARTD_CONFIG_FILE) {
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379 | char* token[2];
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380 | parser_t *parser = config_open2("/etc/bootchartd.conf" + 5, fopen_for_read);
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381 | if (!parser)
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382 | parser = config_open2("/etc/bootchartd.conf", fopen_for_read);
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383 | while (config_read(parser, token, 2, 0, "#=", PARSE_NORMAL & ~PARSE_COLLAPSE)) {
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384 | if (strcmp(token[0], "SAMPLE_PERIOD") == 0 && token[1])
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385 | sample_period_us = atof(token[1]) * 1000000;
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386 | if (strcmp(token[0], "PROCESS_ACCOUNTING") == 0 && token[1]
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387 | && (strcmp(token[1], "on") == 0 || strcmp(token[1], "yes") == 0)
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388 | ) {
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389 | process_accounting = 1;
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390 | }
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391 | }
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392 | config_close(parser);
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393 | if ((int)sample_period_us <= 0)
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394 | sample_period_us = 1; /* prevent division by 0 */
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395 | }
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396 |
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397 | /* Create logger child: */
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398 | logger_pid = fork_or_rexec(argv);
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399 |
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400 | if (logger_pid == 0) { /* child */
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401 | char *tempdir;
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402 |
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403 | bb_signals(0
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404 | + (1 << SIGUSR1)
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405 | + (1 << SIGUSR2)
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406 | + (1 << SIGTERM)
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407 | + (1 << SIGQUIT)
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408 | + (1 << SIGINT)
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409 | + (1 << SIGHUP)
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410 | , record_signo);
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411 |
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412 | if (DO_SIGNAL_SYNC)
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413 | /* Inform parent that we are ready */
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414 | raise(SIGSTOP);
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415 |
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416 | /* If we are started by kernel, PATH might be unset.
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417 | * In order to find "tar", let's set some sane PATH:
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418 | */
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419 | if (cmd == CMD_PID1 && !getenv("PATH"))
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420 | putenv((char*)bb_PATH_root_path);
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421 |
|
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422 | tempdir = make_tempdir();
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423 | do_logging(sample_period_us, process_accounting);
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424 | finalize(tempdir, cmd == CMD_START ? argv[2] : NULL, process_accounting);
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425 | return EXIT_SUCCESS;
|
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426 | }
|
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427 |
|
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428 | /* parent */
|
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429 |
|
---|
430 | USE_FOR_NOMMU(argv[0][0] &= 0x7f); /* undo fork_or_rexec() damage */
|
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431 |
|
---|
432 | if (DO_SIGNAL_SYNC) {
|
---|
433 | /* Wait for logger child to set handlers, then unpause it.
|
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434 | * Otherwise with short-lived PROG (e.g. "bootchartd start true")
|
---|
435 | * we might send SIGUSR1 before logger sets its handler.
|
---|
436 | */
|
---|
437 | waitpid(logger_pid, NULL, WUNTRACED);
|
---|
438 | kill(logger_pid, SIGCONT);
|
---|
439 | }
|
---|
440 |
|
---|
441 | if (cmd == CMD_PID1) {
|
---|
442 | char *bootchart_init = getenv("bootchart_init");
|
---|
443 | if (bootchart_init)
|
---|
444 | execl(bootchart_init, bootchart_init, NULL);
|
---|
445 | execl("/init", "init", NULL);
|
---|
446 | execl("/sbin/init", "init", NULL);
|
---|
447 | bb_perror_msg_and_die("can't execute '%s'", "/sbin/init");
|
---|
448 | }
|
---|
449 |
|
---|
450 | if (cmd == CMD_START && argv[2]) { /* "start PROG ARGS" */
|
---|
451 | pid_t pid = xvfork();
|
---|
452 | if (pid == 0) { /* child */
|
---|
453 | argv += 2;
|
---|
454 | BB_EXECVP_or_die(argv);
|
---|
455 | }
|
---|
456 | /* parent */
|
---|
457 | waitpid(pid, NULL, 0);
|
---|
458 | kill(logger_pid, SIGUSR1);
|
---|
459 | }
|
---|
460 |
|
---|
461 | return EXIT_SUCCESS;
|
---|
462 | }
|
---|