[821] | 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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[1765] | 5 | Licensed under GPL version 2, see file LICENSE in this tarball for details.
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[821] | 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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[1765] | 12 | #include "libbb.h"
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[821] | 13 |
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| 14 | /* Information on the resources used by a child process. */
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| 15 | typedef struct {
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| 16 | int waitstatus;
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| 17 | struct rusage ru;
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[1765] | 18 | unsigned elapsed_ms; /* Wallclock time of process. */
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[821] | 19 | } resource_t;
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| 20 |
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| 21 | /* msec = milliseconds = 1/1,000 (1*10e-3) second.
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| 22 | usec = microseconds = 1/1,000,000 (1*10e-6) second. */
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| 23 |
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| 24 | #define UL unsigned long
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| 25 |
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[1765] | 26 | static const char default_format[] ALIGN1 = "real\t%E\nuser\t%u\nsys\t%T";
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[821] | 27 |
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| 28 | /* The output format for the -p option .*/
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[1765] | 29 | static const char posix_format[] ALIGN1 = "real %e\nuser %U\nsys %S";
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[821] | 30 |
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| 31 |
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| 32 | /* Format string for printing all statistics verbosely.
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| 33 | Keep this output to 24 lines so users on terminals can see it all.*/
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[1765] | 34 | static const char long_format[] ALIGN1 =
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[821] | 35 | "\tCommand being timed: \"%C\"\n"
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| 36 | "\tUser time (seconds): %U\n"
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| 37 | "\tSystem time (seconds): %S\n"
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| 38 | "\tPercent of CPU this job got: %P\n"
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| 39 | "\tElapsed (wall clock) time (h:mm:ss or m:ss): %E\n"
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| 40 | "\tAverage shared text size (kbytes): %X\n"
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| 41 | "\tAverage unshared data size (kbytes): %D\n"
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| 42 | "\tAverage stack size (kbytes): %p\n"
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| 43 | "\tAverage total size (kbytes): %K\n"
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| 44 | "\tMaximum resident set size (kbytes): %M\n"
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| 45 | "\tAverage resident set size (kbytes): %t\n"
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| 46 | "\tMajor (requiring I/O) page faults: %F\n"
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| 47 | "\tMinor (reclaiming a frame) page faults: %R\n"
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| 48 | "\tVoluntary context switches: %w\n"
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| 49 | "\tInvoluntary context switches: %c\n"
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| 50 | "\tSwaps: %W\n"
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| 51 | "\tFile system inputs: %I\n"
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| 52 | "\tFile system outputs: %O\n"
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| 53 | "\tSocket messages sent: %s\n"
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| 54 | "\tSocket messages received: %r\n"
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| 55 | "\tSignals delivered: %k\n"
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[1765] | 56 | "\tPage size (bytes): %Z\n"
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| 57 | "\tExit status: %x";
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[821] | 58 |
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| 59 |
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[1765] | 60 | /* Wait for and fill in data on child process PID.
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| 61 | Return 0 on error, 1 if ok. */
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[821] | 62 |
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| 63 | /* pid_t is short on BSDI, so don't try to promote it. */
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| 64 | static int resuse_end(pid_t pid, resource_t * resp)
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| 65 | {
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| 66 | int status;
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| 67 | pid_t caught;
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| 68 |
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| 69 | /* Ignore signals, but don't ignore the children. When wait3
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| 70 | returns the child process, set the time the command finished. */
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| 71 | while ((caught = wait3(&status, 0, &resp->ru)) != pid) {
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| 72 | if (caught == -1)
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| 73 | return 0;
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| 74 | }
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[1765] | 75 | resp->elapsed_ms = (monotonic_us() / 1000) - resp->elapsed_ms;
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[821] | 76 | resp->waitstatus = status;
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| 77 | return 1;
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| 78 | }
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| 79 |
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[1765] | 80 | /* Print ARGV, with each entry in ARGV separated by FILLER. */
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| 81 | static void printargv(char *const *argv, const char *filler)
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[821] | 82 | {
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[1765] | 83 | fputs(*argv, stdout);
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| 84 | while (*++argv) {
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| 85 | fputs(filler, stdout);
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| 86 | fputs(*argv, stdout);
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[821] | 87 | }
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| 88 | }
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| 89 |
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| 90 | /* Return the number of kilobytes corresponding to a number of pages PAGES.
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| 91 | (Actually, we use it to convert pages*ticks into kilobytes*ticks.)
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| 92 |
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| 93 | Try to do arithmetic so that the risk of overflow errors is minimized.
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| 94 | This is funky since the pagesize could be less than 1K.
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| 95 | Note: Some machines express getrusage statistics in terms of K,
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| 96 | others in terms of pages. */
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| 97 |
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| 98 | static unsigned long ptok(unsigned long pages)
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| 99 | {
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[1765] | 100 | static unsigned long ps;
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[821] | 101 | unsigned long tmp;
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| 102 |
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| 103 | /* Initialization. */
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| 104 | if (ps == 0)
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[1765] | 105 | ps = getpagesize();
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[821] | 106 |
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| 107 | /* Conversion. */
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| 108 | if (pages > (LONG_MAX / ps)) { /* Could overflow. */
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| 109 | tmp = pages / 1024; /* Smaller first, */
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[1765] | 110 | return tmp * ps; /* then larger. */
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[821] | 111 | }
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[1765] | 112 | /* Could underflow. */
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| 113 | tmp = pages * ps; /* Larger first, */
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| 114 | return tmp / 1024; /* then smaller. */
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[821] | 115 | }
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| 116 |
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| 117 | /* summarize: Report on the system use of a command.
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| 118 |
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[1765] | 119 | Print the FMT argument except that `%' sequences
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[821] | 120 | have special meaning, and `\n' and `\t' are translated into
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| 121 | newline and tab, respectively, and `\\' is translated into `\'.
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| 122 |
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| 123 | The character following a `%' can be:
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| 124 | (* means the tcsh time builtin also recognizes it)
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| 125 | % == a literal `%'
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| 126 | C == command name and arguments
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| 127 | * D == average unshared data size in K (ru_idrss+ru_isrss)
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| 128 | * E == elapsed real (wall clock) time in [hour:]min:sec
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| 129 | * F == major page faults (required physical I/O) (ru_majflt)
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| 130 | * I == file system inputs (ru_inblock)
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| 131 | * K == average total mem usage (ru_idrss+ru_isrss+ru_ixrss)
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| 132 | * M == maximum resident set size in K (ru_maxrss)
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| 133 | * O == file system outputs (ru_oublock)
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| 134 | * P == percent of CPU this job got (total cpu time / elapsed time)
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| 135 | * R == minor page faults (reclaims; no physical I/O involved) (ru_minflt)
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| 136 | * S == system (kernel) time (seconds) (ru_stime)
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| 137 | * T == system time in [hour:]min:sec
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| 138 | * U == user time (seconds) (ru_utime)
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| 139 | * u == user time in [hour:]min:sec
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| 140 | * W == times swapped out (ru_nswap)
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| 141 | * X == average amount of shared text in K (ru_ixrss)
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| 142 | Z == page size
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| 143 | * c == involuntary context switches (ru_nivcsw)
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| 144 | e == elapsed real time in seconds
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| 145 | * k == signals delivered (ru_nsignals)
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| 146 | p == average unshared stack size in K (ru_isrss)
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| 147 | * r == socket messages received (ru_msgrcv)
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| 148 | * s == socket messages sent (ru_msgsnd)
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| 149 | t == average resident set size in K (ru_idrss)
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| 150 | * w == voluntary context switches (ru_nvcsw)
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| 151 | x == exit status of command
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| 152 |
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| 153 | Various memory usages are found by converting from page-seconds
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| 154 | to kbytes by multiplying by the page size, dividing by 1024,
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| 155 | and dividing by elapsed real time.
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| 156 |
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| 157 | FMT is the format string, interpreted as described above.
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| 158 | COMMAND is the command and args that are being summarized.
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| 159 | RESP is resource information on the command. */
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| 160 |
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[1765] | 161 | #ifndef TICKS_PER_SEC
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| 162 | #define TICKS_PER_SEC 100
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| 163 | #endif
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| 164 |
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| 165 | static void summarize(const char *fmt, char **command, resource_t * resp)
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[821] | 166 | {
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[1765] | 167 | unsigned vv_ms; /* Elapsed virtual (CPU) milliseconds */
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| 168 | unsigned cpu_ticks; /* Same, in "CPU ticks" */
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[821] | 169 |
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| 170 | if (WIFSTOPPED(resp->waitstatus))
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[1765] | 171 | printf("Command stopped by signal %u\n",
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[821] | 172 | WSTOPSIG(resp->waitstatus));
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| 173 | else if (WIFSIGNALED(resp->waitstatus))
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[1765] | 174 | printf("Command terminated by signal %u\n",
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[821] | 175 | WTERMSIG(resp->waitstatus));
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| 176 | else if (WIFEXITED(resp->waitstatus) && WEXITSTATUS(resp->waitstatus))
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[1765] | 177 | printf("Command exited with non-zero status %u\n",
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[821] | 178 | WEXITSTATUS(resp->waitstatus));
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| 179 |
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[1765] | 180 | vv_ms = (resp->ru.ru_utime.tv_sec + resp->ru.ru_stime.tv_sec) * 1000
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| 181 | + (resp->ru.ru_utime.tv_usec + resp->ru.ru_stime.tv_usec) / 1000;
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[821] | 182 |
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[1765] | 183 | #if (1000 / TICKS_PER_SEC) * TICKS_PER_SEC == 1000
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| 184 | /* 1000 is exactly divisible by TICKS_PER_SEC */
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| 185 | cpu_ticks = vv_ms / (1000 / TICKS_PER_SEC);
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| 186 | #else
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| 187 | cpu_ticks = vv_ms * (unsigned long long)TICKS_PER_SEC / 1000;
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| 188 | #endif
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| 189 | if (!cpu_ticks) cpu_ticks = 1; /* we divide by it, must be nonzero */
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[821] | 190 |
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[1765] | 191 | /* putchar() != putc(stdout) in glibc! */
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[821] | 192 |
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| 193 | while (*fmt) {
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[1765] | 194 | /* Handle leading literal part */
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| 195 | int n = strcspn(fmt, "%\\");
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| 196 | if (n) {
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| 197 | printf("%.*s", n, fmt);
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| 198 | fmt += n;
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| 199 | continue;
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| 200 | }
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| 201 |
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[821] | 202 | switch (*fmt) {
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[1765] | 203 | #ifdef NOT_NEEDED
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| 204 | /* Handle literal char */
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| 205 | /* Usually we optimize for size, but there is a limit
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| 206 | * for everything. With this we do a lot of 1-byte writes */
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| 207 | default:
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| 208 | putc(*fmt, stdout);
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| 209 | break;
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| 210 | #endif
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| 211 |
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[821] | 212 | case '%':
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| 213 | switch (*++fmt) {
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[1765] | 214 | #ifdef NOT_NEEDED_YET
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| 215 | /* Our format strings do not have these */
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| 216 | /* and we do not take format str from user */
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| 217 | default:
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| 218 | putc('%', stdout);
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| 219 | /*FALLTHROUGH*/
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| 220 | case '%':
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| 221 | if (!*fmt) goto ret;
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| 222 | putc(*fmt, stdout);
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[821] | 223 | break;
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[1765] | 224 | #endif
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[821] | 225 | case 'C': /* The command that got timed. */
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[1765] | 226 | printargv(command, " ");
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[821] | 227 | break;
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| 228 | case 'D': /* Average unshared data size. */
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[1765] | 229 | printf("%lu",
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| 230 | ptok((UL) resp->ru.ru_idrss) / cpu_ticks +
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| 231 | ptok((UL) resp->ru.ru_isrss) / cpu_ticks);
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[821] | 232 | break;
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[1765] | 233 | case 'E': { /* Elapsed real (wall clock) time. */
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| 234 | unsigned seconds = resp->elapsed_ms / 1000;
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| 235 | if (seconds >= 3600) /* One hour -> h:m:s. */
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| 236 | printf("%uh %um %02us",
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| 237 | seconds / 3600,
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| 238 | (seconds % 3600) / 60,
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| 239 | seconds % 60);
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[821] | 240 | else
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[1765] | 241 | printf("%um %u.%02us", /* -> m:s. */
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| 242 | seconds / 60,
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| 243 | seconds % 60,
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| 244 | (unsigned)(resp->elapsed_ms / 10) % 100);
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[821] | 245 | break;
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[1765] | 246 | }
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[821] | 247 | case 'F': /* Major page faults. */
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[1765] | 248 | printf("%lu", resp->ru.ru_majflt);
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[821] | 249 | break;
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| 250 | case 'I': /* Inputs. */
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[1765] | 251 | printf("%lu", resp->ru.ru_inblock);
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[821] | 252 | break;
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| 253 | case 'K': /* Average mem usage == data+stack+text. */
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[1765] | 254 | printf("%lu",
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| 255 | ptok((UL) resp->ru.ru_idrss) / cpu_ticks +
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| 256 | ptok((UL) resp->ru.ru_isrss) / cpu_ticks +
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| 257 | ptok((UL) resp->ru.ru_ixrss) / cpu_ticks);
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[821] | 258 | break;
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| 259 | case 'M': /* Maximum resident set size. */
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[1765] | 260 | printf("%lu", ptok((UL) resp->ru.ru_maxrss));
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[821] | 261 | break;
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| 262 | case 'O': /* Outputs. */
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[1765] | 263 | printf("%lu", resp->ru.ru_oublock);
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[821] | 264 | break;
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| 265 | case 'P': /* Percent of CPU this job got. */
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| 266 | /* % cpu is (total cpu time)/(elapsed time). */
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[1765] | 267 | if (resp->elapsed_ms > 0)
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| 268 | printf("%u%%", (unsigned)(vv_ms * 100 / resp->elapsed_ms));
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[821] | 269 | else
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[1765] | 270 | printf("?%%");
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[821] | 271 | break;
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| 272 | case 'R': /* Minor page faults (reclaims). */
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[1765] | 273 | printf("%lu", resp->ru.ru_minflt);
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[821] | 274 | break;
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| 275 | case 'S': /* System time. */
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[1765] | 276 | printf("%u.%02u",
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| 277 | (unsigned)resp->ru.ru_stime.tv_sec,
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| 278 | (unsigned)(resp->ru.ru_stime.tv_usec / 10000));
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[821] | 279 | break;
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| 280 | case 'T': /* System time. */
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| 281 | if (resp->ru.ru_stime.tv_sec >= 3600) /* One hour -> h:m:s. */
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[1765] | 282 | printf("%uh %um %02us",
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| 283 | (unsigned)(resp->ru.ru_stime.tv_sec / 3600),
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| 284 | (unsigned)(resp->ru.ru_stime.tv_sec % 3600) / 60,
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| 285 | (unsigned)(resp->ru.ru_stime.tv_sec % 60));
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[821] | 286 | else
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[1765] | 287 | printf("%um %u.%02us", /* -> m:s. */
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| 288 | (unsigned)(resp->ru.ru_stime.tv_sec / 60),
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| 289 | (unsigned)(resp->ru.ru_stime.tv_sec % 60),
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| 290 | (unsigned)(resp->ru.ru_stime.tv_usec / 10000));
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[821] | 291 | break;
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| 292 | case 'U': /* User time. */
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[1765] | 293 | printf("%u.%02u",
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| 294 | (unsigned)resp->ru.ru_utime.tv_sec,
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| 295 | (unsigned)(resp->ru.ru_utime.tv_usec / 10000));
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[821] | 296 | break;
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| 297 | case 'u': /* User time. */
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| 298 | if (resp->ru.ru_utime.tv_sec >= 3600) /* One hour -> h:m:s. */
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[1765] | 299 | printf("%uh %um %02us",
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| 300 | (unsigned)(resp->ru.ru_utime.tv_sec / 3600),
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| 301 | (unsigned)(resp->ru.ru_utime.tv_sec % 3600) / 60,
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| 302 | (unsigned)(resp->ru.ru_utime.tv_sec % 60));
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[821] | 303 | else
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[1765] | 304 | printf("%um %u.%02us", /* -> m:s. */
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| 305 | (unsigned)(resp->ru.ru_utime.tv_sec / 60),
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| 306 | (unsigned)(resp->ru.ru_utime.tv_sec % 60),
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| 307 | (unsigned)(resp->ru.ru_utime.tv_usec / 10000));
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[821] | 308 | break;
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| 309 | case 'W': /* Times swapped out. */
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[1765] | 310 | printf("%lu", resp->ru.ru_nswap);
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[821] | 311 | break;
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| 312 | case 'X': /* Average shared text size. */
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[1765] | 313 | printf("%lu", ptok((UL) resp->ru.ru_ixrss) / cpu_ticks);
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[821] | 314 | break;
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| 315 | case 'Z': /* Page size. */
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[1765] | 316 | printf("%u", getpagesize());
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[821] | 317 | break;
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| 318 | case 'c': /* Involuntary context switches. */
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[1765] | 319 | printf("%lu", resp->ru.ru_nivcsw);
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[821] | 320 | break;
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| 321 | case 'e': /* Elapsed real time in seconds. */
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[1765] | 322 | printf("%u.%02u",
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| 323 | (unsigned)resp->elapsed_ms / 1000,
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| 324 | (unsigned)(resp->elapsed_ms / 10) % 100);
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[821] | 325 | break;
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| 326 | case 'k': /* Signals delivered. */
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[1765] | 327 | printf("%lu", resp->ru.ru_nsignals);
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[821] | 328 | break;
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| 329 | case 'p': /* Average stack segment. */
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[1765] | 330 | printf("%lu", ptok((UL) resp->ru.ru_isrss) / cpu_ticks);
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[821] | 331 | break;
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| 332 | case 'r': /* Incoming socket messages received. */
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[1765] | 333 | printf("%lu", resp->ru.ru_msgrcv);
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[821] | 334 | break;
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| 335 | case 's': /* Outgoing socket messages sent. */
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[1765] | 336 | printf("%lu", resp->ru.ru_msgsnd);
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[821] | 337 | break;
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| 338 | case 't': /* Average resident set size. */
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[1765] | 339 | printf("%lu", ptok((UL) resp->ru.ru_idrss) / cpu_ticks);
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[821] | 340 | break;
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| 341 | case 'w': /* Voluntary context switches. */
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[1765] | 342 | printf("%lu", resp->ru.ru_nvcsw);
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[821] | 343 | break;
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| 344 | case 'x': /* Exit status. */
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[1765] | 345 | printf("%u", WEXITSTATUS(resp->waitstatus));
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[821] | 346 | break;
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| 347 | }
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| 348 | break;
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| 349 |
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[1765] | 350 | #ifdef NOT_NEEDED_YET
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[821] | 351 | case '\\': /* Format escape. */
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| 352 | switch (*++fmt) {
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[1765] | 353 | default:
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| 354 | putc('\\', stdout);
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| 355 | /*FALLTHROUGH*/
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| 356 | case '\\':
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| 357 | if (!*fmt) goto ret;
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| 358 | putc(*fmt, stdout);
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| 359 | break;
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[821] | 360 | case 't':
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[1765] | 361 | putc('\t', stdout);
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[821] | 362 | break;
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| 363 | case 'n':
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[1765] | 364 | putc('\n', stdout);
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[821] | 365 | break;
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| 366 | }
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| 367 | break;
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[1765] | 368 | #endif
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[821] | 369 | }
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[1765] | 370 | ++fmt;
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[821] | 371 | }
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[1765] | 372 | /* ret: */
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| 373 | putc('\n', stdout);
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[821] | 374 | }
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| 375 |
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| 376 | /* Run command CMD and return statistics on it.
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| 377 | Put the statistics in *RESP. */
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| 378 | static void run_command(char *const *cmd, resource_t * resp)
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| 379 | {
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| 380 | pid_t pid; /* Pid of child. */
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| 381 | __sighandler_t interrupt_signal, quit_signal;
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| 382 |
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[1765] | 383 | resp->elapsed_ms = monotonic_us() / 1000;
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[821] | 384 | pid = vfork(); /* Run CMD as child process. */
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| 385 | if (pid < 0)
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| 386 | bb_error_msg_and_die("cannot fork");
|
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| 387 | else if (pid == 0) { /* If child. */
|
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| 388 | /* Don't cast execvp arguments; that causes errors on some systems,
|
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| 389 | versus merely warnings if the cast is left off. */
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[1765] | 390 | BB_EXECVP(cmd[0], cmd);
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[821] | 391 | bb_error_msg("cannot run %s", cmd[0]);
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| 392 | _exit(errno == ENOENT ? 127 : 126);
|
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| 393 | }
|
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| 394 |
|
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| 395 | /* Have signals kill the child but not self (if possible). */
|
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| 396 | interrupt_signal = signal(SIGINT, SIG_IGN);
|
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| 397 | quit_signal = signal(SIGQUIT, SIG_IGN);
|
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| 398 |
|
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| 399 | if (resuse_end(pid, resp) == 0)
|
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| 400 | bb_error_msg("error waiting for child process");
|
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| 401 |
|
---|
| 402 | /* Re-enable signals. */
|
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| 403 | signal(SIGINT, interrupt_signal);
|
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| 404 | signal(SIGQUIT, quit_signal);
|
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| 405 | }
|
---|
| 406 |
|
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[1765] | 407 | int time_main(int argc, char **argv);
|
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[821] | 408 | int time_main(int argc, char **argv)
|
---|
| 409 | {
|
---|
| 410 | resource_t res;
|
---|
| 411 | const char *output_format = default_format;
|
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[1765] | 412 | char c;
|
---|
[821] | 413 |
|
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[1765] | 414 | goto next;
|
---|
[821] | 415 | /* Parse any options -- don't use getopt() here so we don't
|
---|
| 416 | * consume the args of our client application... */
|
---|
[1765] | 417 | while (argc > 0 && argv[0][0] == '-') {
|
---|
| 418 | while ((c = *++*argv)) {
|
---|
| 419 | switch (c) {
|
---|
[821] | 420 | case 'v':
|
---|
| 421 | output_format = long_format;
|
---|
| 422 | break;
|
---|
| 423 | case 'p':
|
---|
| 424 | output_format = posix_format;
|
---|
| 425 | break;
|
---|
| 426 | default:
|
---|
| 427 | bb_show_usage();
|
---|
| 428 | }
|
---|
| 429 | }
|
---|
[1765] | 430 | next:
|
---|
| 431 | argv++;
|
---|
| 432 | argc--;
|
---|
| 433 | if (!argc)
|
---|
| 434 | bb_show_usage();
|
---|
[821] | 435 | }
|
---|
| 436 |
|
---|
| 437 | run_command(argv, &res);
|
---|
| 438 |
|
---|
[1765] | 439 | /* Cheat. printf's are shorter :) */
|
---|
| 440 | stdout = stderr;
|
---|
| 441 | dup2(2, 1); /* just in case libc does something silly :( */
|
---|
| 442 | summarize(output_format, argv, &res);
|
---|
| 443 |
|
---|
[821] | 444 | if (WIFSTOPPED(res.waitstatus))
|
---|
[1765] | 445 | return WSTOPSIG(res.waitstatus);
|
---|
| 446 | if (WIFSIGNALED(res.waitstatus))
|
---|
| 447 | return WTERMSIG(res.waitstatus);
|
---|
| 448 | if (WIFEXITED(res.waitstatus))
|
---|
| 449 | return WEXITSTATUS(res.waitstatus);
|
---|
| 450 | fflush_stdout_and_exit(0);
|
---|
[821] | 451 | }
|
---|