LXR toybox/toys/posix/time.c

   1/* time.c - time a simple command
   2 *
   3 * Copyright 2013 Rob Landley <rob@landley.net>
   4 *
   5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/time.html
   6
   7USE_TIME(NEWTOY(time, "<1^pv[-pv]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_MAYFORK))
   8
   9config TIME
  10  bool "time"
  11  default y
  12  help
  13    usage: time [-pv] COMMAND...
  14
  15    Run command line and report real, user, and system time elapsed in seconds.
  16    (real = clock on the wall, user = cpu used by command's code,
  17    system = cpu used by OS on behalf of command.)
  18
  19    -p  POSIX format output
  20    -v  Verbose
  21*/
  22
  23#define FOR_time
  24#include "toys.h"
  25
  26
  27void time_main(void)
  28{
  29  struct timespec ts, ts2;
  30  struct rusage ru;
  31  long long sec[3];
  32  int stat, ii, idx, nano[3];
  33  pid_t pid;
  34  char *labels[] = {"\nreal"+!!FLAG(p), "user", "sys"}, **label = labels,
  35       *vlabels[] ={"Real", "User", "System"}, tab = toys.optflags ? ' ' : '\t';
  36
  37  if (FLAG(v)) label = vlabels;
  38  clock_gettime(CLOCK_MONOTONIC, &ts);
  39  if (!(pid = XVFORK())) xexec(toys.optargs);
  40  wait4(pid, &stat, 0, &ru);
  41  clock_gettime(CLOCK_MONOTONIC, &ts2);
  42  sec[0] = nanodiff(&ts, &ts2);
  43  nano[0] = (sec[0] % 1000000000)/(toys.optflags ? 1000 : 1000000);
  44  sec[0] /= 1000000000;
  45  sec[1] = ru.ru_utime.tv_sec, nano[1] = ru.ru_utime.tv_usec;
  46  sec[2] = ru.ru_stime.tv_sec, nano[2] = ru.ru_stime.tv_usec;
  47  for (ii = idx = 0; ii<3; ii++)
  48    idx += sprintf(toybuf+idx, "%s%s%c%lld.%0*d\n", label[ii],
  49                   FLAG(v) ? " time (s):" : "", tab, sec[ii],
  50                   6>>!toys.optflags, nano[ii]);
  51  if (FLAG(v)) idx += sprintf(toybuf+idx,
  52    "Max RSS (KiB): %ld\nMajor faults: %ld\n"
  53    "Minor faults: %ld\nFile system inputs: %ld\nFile system outputs: %ld\n"
  54    "Voluntary context switches: %ld\nInvoluntary context switches: %ld\n",
  55    ru.ru_maxrss, ru.ru_majflt, ru.ru_minflt, ru.ru_inblock,
  56    ru.ru_oublock, ru.ru_nvcsw, ru.ru_nivcsw);
  57  writeall(2, toybuf, idx);
  58
  59  toys.exitval = WIFEXITED(stat) ? WEXITSTATUS(stat) : WTERMSIG(stat);
  60}
  61