1 | /* vi: set sw=4 ts=4: */
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2 | /* `time' utility to display resource usage of processes.
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3 | Copyright (C) 1990, 91, 92, 93, 96 Free Software Foundation, Inc.
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4 |
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5 | Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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6 | */
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7 | /* Originally written by David Keppel <pardo@cs.washington.edu>.
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8 | Heavily modified by David MacKenzie <djm@gnu.ai.mit.edu>.
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9 | Heavily modified for busybox by Erik Andersen <andersen@codepoet.org>
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10 | */
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11 |
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12 | #include "busybox.h"
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13 | #include <stdlib.h>
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14 | #include <stdio.h>
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15 | #include <signal.h>
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16 | #include <errno.h>
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17 | #include <getopt.h>
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18 | #include <string.h>
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19 | #include <limits.h>
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20 | #include <unistd.h>
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21 | #include <sys/types.h> /* For pid_t. */
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22 | #include <sys/wait.h>
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23 | #include <sys/param.h> /* For getpagesize, maybe. */
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24 |
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25 | #define TV_MSEC tv_usec / 1000
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26 | #include <sys/resource.h>
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27 |
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28 | /* Information on the resources used by a child process. */
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29 | typedef struct {
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30 | int waitstatus;
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31 | struct rusage ru;
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32 | struct timeval start, elapsed; /* Wallclock time of process. */
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33 | } resource_t;
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34 |
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35 | /* msec = milliseconds = 1/1,000 (1*10e-3) second.
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36 | usec = microseconds = 1/1,000,000 (1*10e-6) second. */
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37 |
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38 | #ifndef TICKS_PER_SEC
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39 | #define TICKS_PER_SEC 100
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40 | #endif
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41 |
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42 | /* The number of milliseconds in one `tick' used by the `rusage' structure. */
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43 | #define MSEC_PER_TICK (1000 / TICKS_PER_SEC)
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44 |
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45 | /* Return the number of clock ticks that occur in M milliseconds. */
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46 | #define MSEC_TO_TICKS(m) ((m) / MSEC_PER_TICK)
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47 |
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48 | #define UL unsigned long
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49 |
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50 | static const char *const default_format = "real\t%E\nuser\t%u\nsys\t%T";
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51 |
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52 | /* The output format for the -p option .*/
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53 | static const char *const posix_format = "real %e\nuser %U\nsys %S";
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54 |
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55 |
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56 | /* Format string for printing all statistics verbosely.
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57 | Keep this output to 24 lines so users on terminals can see it all.*/
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58 | static const char *const long_format =
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59 | "\tCommand being timed: \"%C\"\n"
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60 | "\tUser time (seconds): %U\n"
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61 | "\tSystem time (seconds): %S\n"
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62 | "\tPercent of CPU this job got: %P\n"
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63 | "\tElapsed (wall clock) time (h:mm:ss or m:ss): %E\n"
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64 | "\tAverage shared text size (kbytes): %X\n"
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65 | "\tAverage unshared data size (kbytes): %D\n"
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66 | "\tAverage stack size (kbytes): %p\n"
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67 | "\tAverage total size (kbytes): %K\n"
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68 | "\tMaximum resident set size (kbytes): %M\n"
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69 | "\tAverage resident set size (kbytes): %t\n"
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70 | "\tMajor (requiring I/O) page faults: %F\n"
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71 | "\tMinor (reclaiming a frame) page faults: %R\n"
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72 | "\tVoluntary context switches: %w\n"
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73 | "\tInvoluntary context switches: %c\n"
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74 | "\tSwaps: %W\n"
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75 | "\tFile system inputs: %I\n"
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76 | "\tFile system outputs: %O\n"
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77 | "\tSocket messages sent: %s\n"
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78 | "\tSocket messages received: %r\n"
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79 | "\tSignals delivered: %k\n"
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80 | "\tPage size (bytes): %Z\n" "\tExit status: %x";
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81 |
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82 |
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83 | /* Wait for and fill in data on child process PID.
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84 | Return 0 on error, 1 if ok. */
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85 |
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86 | /* pid_t is short on BSDI, so don't try to promote it. */
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87 | static int resuse_end(pid_t pid, resource_t * resp)
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88 | {
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89 | int status;
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90 |
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91 | pid_t caught;
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92 |
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93 | /* Ignore signals, but don't ignore the children. When wait3
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94 | returns the child process, set the time the command finished. */
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95 | while ((caught = wait3(&status, 0, &resp->ru)) != pid) {
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96 | if (caught == -1)
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97 | return 0;
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98 | }
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99 |
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100 | gettimeofday(&resp->elapsed, (struct timezone *) 0);
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101 | resp->elapsed.tv_sec -= resp->start.tv_sec;
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102 | if (resp->elapsed.tv_usec < resp->start.tv_usec) {
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103 | /* Manually carry a one from the seconds field. */
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104 | resp->elapsed.tv_usec += 1000000;
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105 | --resp->elapsed.tv_sec;
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106 | }
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107 | resp->elapsed.tv_usec -= resp->start.tv_usec;
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108 |
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109 | resp->waitstatus = status;
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110 |
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111 | return 1;
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112 | }
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113 |
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114 | /* Print ARGV to FP, with each entry in ARGV separated by FILLER. */
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115 | static void fprintargv(FILE * fp, char *const *argv, const char *filler)
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116 | {
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117 | char *const *av;
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118 |
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119 | av = argv;
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120 | fputs(*av, fp);
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121 | while (*++av) {
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122 | fputs(filler, fp);
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123 | fputs(*av, fp);
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124 | }
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125 | if (ferror(fp))
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126 | bb_error_msg_and_die(bb_msg_write_error);
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127 | }
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128 |
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129 | /* Return the number of kilobytes corresponding to a number of pages PAGES.
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130 | (Actually, we use it to convert pages*ticks into kilobytes*ticks.)
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131 |
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132 | Try to do arithmetic so that the risk of overflow errors is minimized.
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133 | This is funky since the pagesize could be less than 1K.
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134 | Note: Some machines express getrusage statistics in terms of K,
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135 | others in terms of pages. */
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136 |
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137 | static unsigned long ptok(unsigned long pages)
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138 | {
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139 | static unsigned long ps = 0;
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140 | unsigned long tmp;
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141 | static long size = LONG_MAX;
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142 |
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143 | /* Initialization. */
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144 | if (ps == 0)
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145 | ps = (long) getpagesize();
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146 |
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147 | /* Conversion. */
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148 | if (pages > (LONG_MAX / ps)) { /* Could overflow. */
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149 | tmp = pages / 1024; /* Smaller first, */
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150 | size = tmp * ps; /* then larger. */
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151 | } else { /* Could underflow. */
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152 | tmp = pages * ps; /* Larger first, */
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153 | size = tmp / 1024; /* then smaller. */
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154 | }
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155 | return size;
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156 | }
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157 |
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158 | /* summarize: Report on the system use of a command.
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159 |
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160 | Copy the FMT argument to FP except that `%' sequences
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161 | have special meaning, and `\n' and `\t' are translated into
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162 | newline and tab, respectively, and `\\' is translated into `\'.
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163 |
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164 | The character following a `%' can be:
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165 | (* means the tcsh time builtin also recognizes it)
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166 | % == a literal `%'
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167 | C == command name and arguments
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168 | * D == average unshared data size in K (ru_idrss+ru_isrss)
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169 | * E == elapsed real (wall clock) time in [hour:]min:sec
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170 | * F == major page faults (required physical I/O) (ru_majflt)
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171 | * I == file system inputs (ru_inblock)
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172 | * K == average total mem usage (ru_idrss+ru_isrss+ru_ixrss)
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173 | * M == maximum resident set size in K (ru_maxrss)
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174 | * O == file system outputs (ru_oublock)
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175 | * P == percent of CPU this job got (total cpu time / elapsed time)
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176 | * R == minor page faults (reclaims; no physical I/O involved) (ru_minflt)
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177 | * S == system (kernel) time (seconds) (ru_stime)
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178 | * T == system time in [hour:]min:sec
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179 | * U == user time (seconds) (ru_utime)
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180 | * u == user time in [hour:]min:sec
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181 | * W == times swapped out (ru_nswap)
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182 | * X == average amount of shared text in K (ru_ixrss)
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183 | Z == page size
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184 | * c == involuntary context switches (ru_nivcsw)
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185 | e == elapsed real time in seconds
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186 | * k == signals delivered (ru_nsignals)
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187 | p == average unshared stack size in K (ru_isrss)
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188 | * r == socket messages received (ru_msgrcv)
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189 | * s == socket messages sent (ru_msgsnd)
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190 | t == average resident set size in K (ru_idrss)
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191 | * w == voluntary context switches (ru_nvcsw)
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192 | x == exit status of command
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193 |
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194 | Various memory usages are found by converting from page-seconds
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195 | to kbytes by multiplying by the page size, dividing by 1024,
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196 | and dividing by elapsed real time.
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197 |
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198 | FP is the stream to print to.
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199 | FMT is the format string, interpreted as described above.
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200 | COMMAND is the command and args that are being summarized.
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201 | RESP is resource information on the command. */
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202 |
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203 | static void summarize(FILE * fp, const char *fmt, char **command,
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204 | resource_t * resp)
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205 | {
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206 | unsigned long r; /* Elapsed real milliseconds. */
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207 | unsigned long v; /* Elapsed virtual (CPU) milliseconds. */
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208 |
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209 | if (WIFSTOPPED(resp->waitstatus))
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210 | fprintf(fp, "Command stopped by signal %d\n",
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211 | WSTOPSIG(resp->waitstatus));
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212 | else if (WIFSIGNALED(resp->waitstatus))
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213 | fprintf(fp, "Command terminated by signal %d\n",
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214 | WTERMSIG(resp->waitstatus));
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215 | else if (WIFEXITED(resp->waitstatus) && WEXITSTATUS(resp->waitstatus))
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216 | fprintf(fp, "Command exited with non-zero status %d\n",
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217 | WEXITSTATUS(resp->waitstatus));
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218 |
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219 | /* Convert all times to milliseconds. Occasionally, one of these values
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220 | comes out as zero. Dividing by zero causes problems, so we first
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221 | check the time value. If it is zero, then we take `evasive action'
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222 | instead of calculating a value. */
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223 |
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224 | r = resp->elapsed.tv_sec * 1000 + resp->elapsed.tv_usec / 1000;
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225 |
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226 | v = resp->ru.ru_utime.tv_sec * 1000 + resp->ru.ru_utime.TV_MSEC +
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227 | resp->ru.ru_stime.tv_sec * 1000 + resp->ru.ru_stime.TV_MSEC;
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228 |
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229 | while (*fmt) {
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230 | switch (*fmt) {
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231 | case '%':
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232 | switch (*++fmt) {
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233 | case '%': /* Literal '%'. */
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234 | putc('%', fp);
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235 | break;
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236 | case 'C': /* The command that got timed. */
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237 | fprintargv(fp, command, " ");
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238 | break;
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239 | case 'D': /* Average unshared data size. */
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240 | fprintf(fp, "%lu",
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241 | MSEC_TO_TICKS(v) == 0 ? 0 :
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242 | ptok((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS(v) +
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243 | ptok((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS(v));
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244 | break;
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245 | case 'E': /* Elapsed real (wall clock) time. */
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246 | if (resp->elapsed.tv_sec >= 3600) /* One hour -> h:m:s. */
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247 | fprintf(fp, "%ldh %ldm %02lds",
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248 | resp->elapsed.tv_sec / 3600,
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249 | (resp->elapsed.tv_sec % 3600) / 60,
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250 | resp->elapsed.tv_sec % 60);
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251 | else
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252 | fprintf(fp, "%ldm %ld.%02lds", /* -> m:s. */
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253 | resp->elapsed.tv_sec / 60,
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254 | resp->elapsed.tv_sec % 60,
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255 | resp->elapsed.tv_usec / 10000);
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256 | break;
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257 | case 'F': /* Major page faults. */
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258 | fprintf(fp, "%ld", resp->ru.ru_majflt);
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259 | break;
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260 | case 'I': /* Inputs. */
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261 | fprintf(fp, "%ld", resp->ru.ru_inblock);
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262 | break;
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263 | case 'K': /* Average mem usage == data+stack+text. */
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264 | fprintf(fp, "%lu",
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265 | MSEC_TO_TICKS(v) == 0 ? 0 :
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266 | ptok((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS(v) +
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267 | ptok((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS(v) +
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268 | ptok((UL) resp->ru.ru_ixrss) / MSEC_TO_TICKS(v));
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269 | break;
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270 | case 'M': /* Maximum resident set size. */
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271 | fprintf(fp, "%lu", ptok((UL) resp->ru.ru_maxrss));
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272 | break;
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273 | case 'O': /* Outputs. */
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274 | fprintf(fp, "%ld", resp->ru.ru_oublock);
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275 | break;
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276 | case 'P': /* Percent of CPU this job got. */
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277 | /* % cpu is (total cpu time)/(elapsed time). */
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278 | if (r > 0)
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279 | fprintf(fp, "%lu%%", (v * 100 / r));
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280 | else
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281 | fprintf(fp, "?%%");
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282 | break;
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283 | case 'R': /* Minor page faults (reclaims). */
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284 | fprintf(fp, "%ld", resp->ru.ru_minflt);
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285 | break;
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286 | case 'S': /* System time. */
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287 | fprintf(fp, "%ld.%02ld",
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288 | resp->ru.ru_stime.tv_sec,
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289 | resp->ru.ru_stime.TV_MSEC / 10);
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290 | break;
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291 | case 'T': /* System time. */
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292 | if (resp->ru.ru_stime.tv_sec >= 3600) /* One hour -> h:m:s. */
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293 | fprintf(fp, "%ldh %ldm %02lds",
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294 | resp->ru.ru_stime.tv_sec / 3600,
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295 | (resp->ru.ru_stime.tv_sec % 3600) / 60,
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296 | resp->ru.ru_stime.tv_sec % 60);
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297 | else
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298 | fprintf(fp, "%ldm %ld.%02lds", /* -> m:s. */
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299 | resp->ru.ru_stime.tv_sec / 60,
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300 | resp->ru.ru_stime.tv_sec % 60,
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301 | resp->ru.ru_stime.tv_usec / 10000);
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302 | break;
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303 | case 'U': /* User time. */
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304 | fprintf(fp, "%ld.%02ld",
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305 | resp->ru.ru_utime.tv_sec,
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306 | resp->ru.ru_utime.TV_MSEC / 10);
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307 | break;
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308 | case 'u': /* User time. */
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309 | if (resp->ru.ru_utime.tv_sec >= 3600) /* One hour -> h:m:s. */
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310 | fprintf(fp, "%ldh %ldm %02lds",
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311 | resp->ru.ru_utime.tv_sec / 3600,
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312 | (resp->ru.ru_utime.tv_sec % 3600) / 60,
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313 | resp->ru.ru_utime.tv_sec % 60);
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314 | else
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315 | fprintf(fp, "%ldm %ld.%02lds", /* -> m:s. */
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316 | resp->ru.ru_utime.tv_sec / 60,
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317 | resp->ru.ru_utime.tv_sec % 60,
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318 | resp->ru.ru_utime.tv_usec / 10000);
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319 | break;
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320 | case 'W': /* Times swapped out. */
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321 | fprintf(fp, "%ld", resp->ru.ru_nswap);
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322 | break;
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323 | case 'X': /* Average shared text size. */
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324 | fprintf(fp, "%lu",
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325 | MSEC_TO_TICKS(v) == 0 ? 0 :
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326 | ptok((UL) resp->ru.ru_ixrss) / MSEC_TO_TICKS(v));
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327 | break;
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328 | case 'Z': /* Page size. */
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329 | fprintf(fp, "%d", getpagesize());
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330 | break;
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331 | case 'c': /* Involuntary context switches. */
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332 | fprintf(fp, "%ld", resp->ru.ru_nivcsw);
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333 | break;
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334 | case 'e': /* Elapsed real time in seconds. */
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335 | fprintf(fp, "%ld.%02ld",
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336 | resp->elapsed.tv_sec, resp->elapsed.tv_usec / 10000);
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337 | break;
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338 | case 'k': /* Signals delivered. */
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339 | fprintf(fp, "%ld", resp->ru.ru_nsignals);
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340 | break;
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341 | case 'p': /* Average stack segment. */
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342 | fprintf(fp, "%lu",
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343 | MSEC_TO_TICKS(v) == 0 ? 0 :
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344 | ptok((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS(v));
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345 | break;
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346 | case 'r': /* Incoming socket messages received. */
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347 | fprintf(fp, "%ld", resp->ru.ru_msgrcv);
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348 | break;
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349 | case 's': /* Outgoing socket messages sent. */
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350 | fprintf(fp, "%ld", resp->ru.ru_msgsnd);
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351 | break;
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352 | case 't': /* Average resident set size. */
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353 | fprintf(fp, "%lu",
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354 | MSEC_TO_TICKS(v) == 0 ? 0 :
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355 | ptok((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS(v));
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356 | break;
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357 | case 'w': /* Voluntary context switches. */
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358 | fprintf(fp, "%ld", resp->ru.ru_nvcsw);
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359 | break;
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360 | case 'x': /* Exit status. */
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361 | fprintf(fp, "%d", WEXITSTATUS(resp->waitstatus));
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362 | break;
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363 | case '\0':
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364 | putc('?', fp);
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365 | return;
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366 | default:
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367 | putc('?', fp);
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368 | putc(*fmt, fp);
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369 | }
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370 | ++fmt;
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371 | break;
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372 |
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373 | case '\\': /* Format escape. */
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374 | switch (*++fmt) {
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375 | case 't':
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376 | putc('\t', fp);
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377 | break;
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378 | case 'n':
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379 | putc('\n', fp);
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380 | break;
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381 | case '\\':
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382 | putc('\\', fp);
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383 | break;
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384 | default:
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385 | putc('?', fp);
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386 | putc('\\', fp);
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387 | putc(*fmt, fp);
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388 | }
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389 | ++fmt;
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390 | break;
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391 |
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392 | default:
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393 | putc(*fmt++, fp);
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394 | }
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395 |
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396 | if (ferror(fp))
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397 | bb_error_msg_and_die(bb_msg_write_error);
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398 | }
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399 | putc('\n', fp);
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400 |
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401 | if (ferror(fp))
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402 | bb_error_msg_and_die(bb_msg_write_error);
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403 | }
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404 |
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405 | /* Run command CMD and return statistics on it.
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406 | Put the statistics in *RESP. */
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407 | static void run_command(char *const *cmd, resource_t * resp)
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408 | {
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409 | pid_t pid; /* Pid of child. */
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410 | __sighandler_t interrupt_signal, quit_signal;
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411 |
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412 | gettimeofday(&resp->start, (struct timezone *) 0);
|
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413 | pid = vfork(); /* Run CMD as child process. */
|
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414 | if (pid < 0)
|
---|
415 | bb_error_msg_and_die("cannot fork");
|
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416 | else if (pid == 0) { /* If child. */
|
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417 | /* Don't cast execvp arguments; that causes errors on some systems,
|
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418 | versus merely warnings if the cast is left off. */
|
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419 | execvp(cmd[0], cmd);
|
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420 | bb_error_msg("cannot run %s", cmd[0]);
|
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421 | _exit(errno == ENOENT ? 127 : 126);
|
---|
422 | }
|
---|
423 |
|
---|
424 | /* Have signals kill the child but not self (if possible). */
|
---|
425 | interrupt_signal = signal(SIGINT, SIG_IGN);
|
---|
426 | quit_signal = signal(SIGQUIT, SIG_IGN);
|
---|
427 |
|
---|
428 | if (resuse_end(pid, resp) == 0)
|
---|
429 | bb_error_msg("error waiting for child process");
|
---|
430 |
|
---|
431 | /* Re-enable signals. */
|
---|
432 | signal(SIGINT, interrupt_signal);
|
---|
433 | signal(SIGQUIT, quit_signal);
|
---|
434 | }
|
---|
435 |
|
---|
436 | int time_main(int argc, char **argv)
|
---|
437 | {
|
---|
438 | int gotone;
|
---|
439 | resource_t res;
|
---|
440 | const char *output_format = default_format;
|
---|
441 |
|
---|
442 | argc--;
|
---|
443 | argv++;
|
---|
444 | /* Parse any options -- don't use getopt() here so we don't
|
---|
445 | * consume the args of our client application... */
|
---|
446 | while (argc > 0 && **argv == '-') {
|
---|
447 | gotone = 0;
|
---|
448 | while (gotone == 0 && *++(*argv)) {
|
---|
449 | switch (**argv) {
|
---|
450 | case 'v':
|
---|
451 | output_format = long_format;
|
---|
452 | break;
|
---|
453 | case 'p':
|
---|
454 | output_format = posix_format;
|
---|
455 | break;
|
---|
456 | default:
|
---|
457 | bb_show_usage();
|
---|
458 | }
|
---|
459 | argc--;
|
---|
460 | argv++;
|
---|
461 | gotone = 1;
|
---|
462 | }
|
---|
463 | }
|
---|
464 |
|
---|
465 | if (argv == NULL || *argv == NULL)
|
---|
466 | bb_show_usage();
|
---|
467 |
|
---|
468 | run_command(argv, &res);
|
---|
469 | summarize(stderr, output_format, argv, &res);
|
---|
470 | fflush(stderr);
|
---|
471 |
|
---|
472 | if (WIFSTOPPED(res.waitstatus))
|
---|
473 | exit(WSTOPSIG(res.waitstatus));
|
---|
474 | else if (WIFSIGNALED(res.waitstatus))
|
---|
475 | exit(WTERMSIG(res.waitstatus));
|
---|
476 | else if (WIFEXITED(res.waitstatus))
|
---|
477 | exit(WEXITSTATUS(res.waitstatus));
|
---|
478 | return 0;
|
---|
479 | }
|
---|