[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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| 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);
|
---|
| 388 | }
|
---|
| 389 | ++fmt;
|
---|
| 390 | break;
|
---|
| 391 |
|
---|
| 392 | default:
|
---|
| 393 | putc(*fmt++, fp);
|
---|
| 394 | }
|
---|
| 395 |
|
---|
| 396 | if (ferror(fp))
|
---|
| 397 | bb_error_msg_and_die(bb_msg_write_error);
|
---|
| 398 | }
|
---|
| 399 | putc('\n', fp);
|
---|
| 400 |
|
---|
| 401 | if (ferror(fp))
|
---|
| 402 | bb_error_msg_and_die(bb_msg_write_error);
|
---|
| 403 | }
|
---|
| 404 |
|
---|
| 405 | /* Run command CMD and return statistics on it.
|
---|
| 406 | Put the statistics in *RESP. */
|
---|
| 407 | static void run_command(char *const *cmd, resource_t * resp)
|
---|
| 408 | {
|
---|
| 409 | pid_t pid; /* Pid of child. */
|
---|
| 410 | __sighandler_t interrupt_signal, quit_signal;
|
---|
| 411 |
|
---|
| 412 | gettimeofday(&resp->start, (struct timezone *) 0);
|
---|
| 413 | pid = vfork(); /* Run CMD as child process. */
|
---|
| 414 | if (pid < 0)
|
---|
| 415 | bb_error_msg_and_die("cannot fork");
|
---|
| 416 | else if (pid == 0) { /* If child. */
|
---|
| 417 | /* Don't cast execvp arguments; that causes errors on some systems,
|
---|
| 418 | versus merely warnings if the cast is left off. */
|
---|
| 419 | execvp(cmd[0], cmd);
|
---|
| 420 | bb_error_msg("cannot run %s", cmd[0]);
|
---|
| 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 | }
|
---|