428 lines
13 KiB
C
428 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/* 'time' utility to display resource usage of processes.
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Copyright (C) 1990, 91, 92, 93, 96 Free Software Foundation, Inc.
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Licensed under GPL version 2, see file LICENSE in this tarball for details.
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*/
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/* Originally written by David Keppel <pardo@cs.washington.edu>.
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Heavily modified by David MacKenzie <djm@gnu.ai.mit.edu>.
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Heavily modified for busybox by Erik Andersen <andersen@codepoet.org>
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*/
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#include "libbb.h"
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/* Information on the resources used by a child process. */
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typedef struct {
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int waitstatus;
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struct rusage ru;
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unsigned elapsed_ms; /* Wallclock time of process. */
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} resource_t;
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/* msec = milliseconds = 1/1,000 (1*10e-3) second.
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usec = microseconds = 1/1,000,000 (1*10e-6) second. */
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#define UL unsigned long
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static const char default_format[] ALIGN1 = "real\t%E\nuser\t%u\nsys\t%T";
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/* The output format for the -p option .*/
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static const char posix_format[] ALIGN1 = "real %e\nuser %U\nsys %S";
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/* Format string for printing all statistics verbosely.
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Keep this output to 24 lines so users on terminals can see it all.*/
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static const char long_format[] ALIGN1 =
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"\tCommand being timed: \"%C\"\n"
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"\tUser time (seconds): %U\n"
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"\tSystem time (seconds): %S\n"
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"\tPercent of CPU this job got: %P\n"
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"\tElapsed (wall clock) time (h:mm:ss or m:ss): %E\n"
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"\tAverage shared text size (kbytes): %X\n"
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"\tAverage unshared data size (kbytes): %D\n"
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"\tAverage stack size (kbytes): %p\n"
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"\tAverage total size (kbytes): %K\n"
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"\tMaximum resident set size (kbytes): %M\n"
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"\tAverage resident set size (kbytes): %t\n"
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"\tMajor (requiring I/O) page faults: %F\n"
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"\tMinor (reclaiming a frame) page faults: %R\n"
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"\tVoluntary context switches: %w\n"
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"\tInvoluntary context switches: %c\n"
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"\tSwaps: %W\n"
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"\tFile system inputs: %I\n"
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"\tFile system outputs: %O\n"
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"\tSocket messages sent: %s\n"
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"\tSocket messages received: %r\n"
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"\tSignals delivered: %k\n"
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"\tPage size (bytes): %Z\n"
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"\tExit status: %x";
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/* Wait for and fill in data on child process PID.
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Return 0 on error, 1 if ok. */
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/* pid_t is short on BSDI, so don't try to promote it. */
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static void resuse_end(pid_t pid, resource_t *resp)
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{
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pid_t caught;
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/* Ignore signals, but don't ignore the children. When wait3
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returns the child process, set the time the command finished. */
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while ((caught = wait3(&resp->waitstatus, 0, &resp->ru)) != pid) {
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if (caught == -1 && errno != EINTR) {
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bb_perror_msg("wait");
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return;
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}
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}
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resp->elapsed_ms = monotonic_ms() - resp->elapsed_ms;
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}
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static void printargv(char *const *argv)
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{
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const char *fmt = " %s" + 1;
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do {
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printf(fmt, *argv);
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fmt = " %s";
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} while (*++argv);
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}
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/* Return the number of kilobytes corresponding to a number of pages PAGES.
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(Actually, we use it to convert pages*ticks into kilobytes*ticks.)
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Try to do arithmetic so that the risk of overflow errors is minimized.
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This is funky since the pagesize could be less than 1K.
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Note: Some machines express getrusage statistics in terms of K,
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others in terms of pages. */
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static unsigned long ptok(const unsigned pagesize, const unsigned long pages)
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{
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unsigned long tmp;
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/* Conversion. */
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if (pages > (LONG_MAX / pagesize)) { /* Could overflow. */
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tmp = pages / 1024; /* Smaller first, */
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return tmp * pagesize; /* then larger. */
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}
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/* Could underflow. */
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tmp = pages * pagesize; /* Larger first, */
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return tmp / 1024; /* then smaller. */
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}
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/* summarize: Report on the system use of a command.
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Print the FMT argument except that `%' sequences
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have special meaning, and `\n' and `\t' are translated into
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newline and tab, respectively, and `\\' is translated into `\'.
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The character following a `%' can be:
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(* means the tcsh time builtin also recognizes it)
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% == a literal `%'
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C == command name and arguments
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* D == average unshared data size in K (ru_idrss+ru_isrss)
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* E == elapsed real (wall clock) time in [hour:]min:sec
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* F == major page faults (required physical I/O) (ru_majflt)
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* I == file system inputs (ru_inblock)
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* K == average total mem usage (ru_idrss+ru_isrss+ru_ixrss)
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* M == maximum resident set size in K (ru_maxrss)
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* O == file system outputs (ru_oublock)
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* P == percent of CPU this job got (total cpu time / elapsed time)
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* R == minor page faults (reclaims; no physical I/O involved) (ru_minflt)
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* S == system (kernel) time (seconds) (ru_stime)
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* T == system time in [hour:]min:sec
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* U == user time (seconds) (ru_utime)
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* u == user time in [hour:]min:sec
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* W == times swapped out (ru_nswap)
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* X == average amount of shared text in K (ru_ixrss)
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Z == page size
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* c == involuntary context switches (ru_nivcsw)
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e == elapsed real time in seconds
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* k == signals delivered (ru_nsignals)
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p == average unshared stack size in K (ru_isrss)
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* r == socket messages received (ru_msgrcv)
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* s == socket messages sent (ru_msgsnd)
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t == average resident set size in K (ru_idrss)
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* w == voluntary context switches (ru_nvcsw)
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x == exit status of command
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Various memory usages are found by converting from page-seconds
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to kbytes by multiplying by the page size, dividing by 1024,
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and dividing by elapsed real time.
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FMT is the format string, interpreted as described above.
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COMMAND is the command and args that are being summarized.
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RESP is resource information on the command. */
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#ifndef TICKS_PER_SEC
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#define TICKS_PER_SEC 100
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#endif
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static void summarize(const char *fmt, char **command, resource_t *resp)
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{
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unsigned vv_ms; /* Elapsed virtual (CPU) milliseconds */
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unsigned cpu_ticks; /* Same, in "CPU ticks" */
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unsigned pagesize = getpagesize();
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/* Impossible: we do not use WUNTRACED flag in wait()...
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if (WIFSTOPPED(resp->waitstatus))
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printf("Command stopped by signal %u\n",
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WSTOPSIG(resp->waitstatus));
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else */
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if (WIFSIGNALED(resp->waitstatus))
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printf("Command terminated by signal %u\n",
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WTERMSIG(resp->waitstatus));
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else if (WIFEXITED(resp->waitstatus) && WEXITSTATUS(resp->waitstatus))
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printf("Command exited with non-zero status %u\n",
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WEXITSTATUS(resp->waitstatus));
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vv_ms = (resp->ru.ru_utime.tv_sec + resp->ru.ru_stime.tv_sec) * 1000
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+ (resp->ru.ru_utime.tv_usec + resp->ru.ru_stime.tv_usec) / 1000;
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#if (1000 / TICKS_PER_SEC) * TICKS_PER_SEC == 1000
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/* 1000 is exactly divisible by TICKS_PER_SEC (typical) */
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cpu_ticks = vv_ms / (1000 / TICKS_PER_SEC);
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#else
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cpu_ticks = vv_ms * (unsigned long long)TICKS_PER_SEC / 1000;
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#endif
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if (!cpu_ticks) cpu_ticks = 1; /* we divide by it, must be nonzero */
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while (*fmt) {
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/* Handle leading literal part */
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int n = strcspn(fmt, "%\\");
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if (n) {
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printf("%.*s", n, fmt);
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fmt += n;
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continue;
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}
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switch (*fmt) {
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#ifdef NOT_NEEDED
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/* Handle literal char */
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/* Usually we optimize for size, but there is a limit
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* for everything. With this we do a lot of 1-byte writes */
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default:
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bb_putchar(*fmt);
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break;
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#endif
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case '%':
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switch (*++fmt) {
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#ifdef NOT_NEEDED_YET
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/* Our format strings do not have these */
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/* and we do not take format str from user */
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default:
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bb_putchar('%');
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/*FALLTHROUGH*/
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case '%':
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if (!*fmt) goto ret;
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bb_putchar(*fmt);
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break;
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#endif
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case 'C': /* The command that got timed. */
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printargv(command);
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break;
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case 'D': /* Average unshared data size. */
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printf("%lu",
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(ptok(pagesize, (UL) resp->ru.ru_idrss) +
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ptok(pagesize, (UL) resp->ru.ru_isrss)) / cpu_ticks);
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break;
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case 'E': { /* Elapsed real (wall clock) time. */
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unsigned seconds = resp->elapsed_ms / 1000;
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if (seconds >= 3600) /* One hour -> h:m:s. */
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printf("%uh %um %02us",
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seconds / 3600,
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(seconds % 3600) / 60,
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seconds % 60);
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else
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printf("%um %u.%02us", /* -> m:s. */
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seconds / 60,
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seconds % 60,
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(unsigned)(resp->elapsed_ms / 10) % 100);
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break;
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}
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case 'F': /* Major page faults. */
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printf("%lu", resp->ru.ru_majflt);
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break;
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case 'I': /* Inputs. */
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printf("%lu", resp->ru.ru_inblock);
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break;
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case 'K': /* Average mem usage == data+stack+text. */
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printf("%lu",
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(ptok(pagesize, (UL) resp->ru.ru_idrss) +
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ptok(pagesize, (UL) resp->ru.ru_isrss) +
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ptok(pagesize, (UL) resp->ru.ru_ixrss)) / cpu_ticks);
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break;
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case 'M': /* Maximum resident set size. */
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printf("%lu", ptok(pagesize, (UL) resp->ru.ru_maxrss));
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break;
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case 'O': /* Outputs. */
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printf("%lu", resp->ru.ru_oublock);
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break;
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case 'P': /* Percent of CPU this job got. */
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/* % cpu is (total cpu time)/(elapsed time). */
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if (resp->elapsed_ms > 0)
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printf("%u%%", (unsigned)(vv_ms * 100 / resp->elapsed_ms));
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else
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printf("?%%");
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break;
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case 'R': /* Minor page faults (reclaims). */
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printf("%lu", resp->ru.ru_minflt);
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break;
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case 'S': /* System time. */
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printf("%u.%02u",
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(unsigned)resp->ru.ru_stime.tv_sec,
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(unsigned)(resp->ru.ru_stime.tv_usec / 10000));
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break;
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case 'T': /* System time. */
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if (resp->ru.ru_stime.tv_sec >= 3600) /* One hour -> h:m:s. */
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printf("%uh %um %02us",
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(unsigned)(resp->ru.ru_stime.tv_sec / 3600),
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(unsigned)(resp->ru.ru_stime.tv_sec % 3600) / 60,
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(unsigned)(resp->ru.ru_stime.tv_sec % 60));
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else
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printf("%um %u.%02us", /* -> m:s. */
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(unsigned)(resp->ru.ru_stime.tv_sec / 60),
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(unsigned)(resp->ru.ru_stime.tv_sec % 60),
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(unsigned)(resp->ru.ru_stime.tv_usec / 10000));
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break;
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case 'U': /* User time. */
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printf("%u.%02u",
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(unsigned)resp->ru.ru_utime.tv_sec,
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(unsigned)(resp->ru.ru_utime.tv_usec / 10000));
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break;
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case 'u': /* User time. */
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if (resp->ru.ru_utime.tv_sec >= 3600) /* One hour -> h:m:s. */
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printf("%uh %um %02us",
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(unsigned)(resp->ru.ru_utime.tv_sec / 3600),
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(unsigned)(resp->ru.ru_utime.tv_sec % 3600) / 60,
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(unsigned)(resp->ru.ru_utime.tv_sec % 60));
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else
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printf("%um %u.%02us", /* -> m:s. */
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(unsigned)(resp->ru.ru_utime.tv_sec / 60),
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(unsigned)(resp->ru.ru_utime.tv_sec % 60),
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(unsigned)(resp->ru.ru_utime.tv_usec / 10000));
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break;
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case 'W': /* Times swapped out. */
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printf("%lu", resp->ru.ru_nswap);
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break;
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case 'X': /* Average shared text size. */
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printf("%lu", ptok(pagesize, (UL) resp->ru.ru_ixrss) / cpu_ticks);
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break;
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case 'Z': /* Page size. */
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printf("%u", pagesize);
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break;
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case 'c': /* Involuntary context switches. */
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printf("%lu", resp->ru.ru_nivcsw);
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break;
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case 'e': /* Elapsed real time in seconds. */
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printf("%u.%02u",
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(unsigned)resp->elapsed_ms / 1000,
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(unsigned)(resp->elapsed_ms / 10) % 100);
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break;
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case 'k': /* Signals delivered. */
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printf("%lu", resp->ru.ru_nsignals);
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break;
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case 'p': /* Average stack segment. */
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printf("%lu", ptok(pagesize, (UL) resp->ru.ru_isrss) / cpu_ticks);
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break;
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case 'r': /* Incoming socket messages received. */
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printf("%lu", resp->ru.ru_msgrcv);
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break;
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case 's': /* Outgoing socket messages sent. */
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printf("%lu", resp->ru.ru_msgsnd);
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break;
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case 't': /* Average resident set size. */
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printf("%lu", ptok(pagesize, (UL) resp->ru.ru_idrss) / cpu_ticks);
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break;
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case 'w': /* Voluntary context switches. */
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printf("%lu", resp->ru.ru_nvcsw);
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break;
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case 'x': /* Exit status. */
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printf("%u", WEXITSTATUS(resp->waitstatus));
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break;
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}
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break;
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#ifdef NOT_NEEDED_YET
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case '\\': /* Format escape. */
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switch (*++fmt) {
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default:
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bb_putchar('\\');
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/*FALLTHROUGH*/
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case '\\':
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if (!*fmt) goto ret;
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bb_putchar(*fmt);
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break;
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case 't':
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bb_putchar('\t');
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break;
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case 'n':
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bb_putchar('\n');
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break;
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}
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break;
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#endif
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}
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++fmt;
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}
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/* ret: */
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bb_putchar('\n');
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}
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/* Run command CMD and return statistics on it.
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Put the statistics in *RESP. */
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static void run_command(char *const *cmd, resource_t *resp)
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{
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pid_t pid; /* Pid of child. */
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void (*interrupt_signal)(int);
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void (*quit_signal)(int);
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resp->elapsed_ms = monotonic_ms();
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pid = vfork(); /* Run CMD as child process. */
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if (pid < 0)
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bb_perror_msg_and_die("fork");
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if (pid == 0) { /* If child. */
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/* Don't cast execvp arguments; that causes errors on some systems,
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versus merely warnings if the cast is left off. */
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BB_EXECVP(cmd[0], cmd);
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xfunc_error_retval = (errno == ENOENT ? 127 : 126);
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bb_perror_msg_and_die("can't execute '%s'", cmd[0]);
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}
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/* Have signals kill the child but not self (if possible). */
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//TODO: just block all sigs? and reenable them in the very end in main?
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interrupt_signal = signal(SIGINT, SIG_IGN);
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quit_signal = signal(SIGQUIT, SIG_IGN);
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resuse_end(pid, resp);
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/* Re-enable signals. */
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signal(SIGINT, interrupt_signal);
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signal(SIGQUIT, quit_signal);
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}
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int time_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int time_main(int argc UNUSED_PARAM, char **argv)
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{
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resource_t res;
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const char *output_format = default_format;
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int opt;
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opt_complementary = "-1"; /* at least one arg */
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/* "+": stop on first non-option */
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opt = getopt32(argv, "+vp");
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argv += optind;
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if (opt & 1)
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output_format = long_format;
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if (opt & 2)
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output_format = posix_format;
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run_command(argv, &res);
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/* Cheat. printf's are shorter :) */
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xdup2(STDERR_FILENO, STDOUT_FILENO);
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summarize(output_format, argv, &res);
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if (WIFSTOPPED(res.waitstatus))
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return WSTOPSIG(res.waitstatus);
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if (WIFSIGNALED(res.waitstatus))
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return WTERMSIG(res.waitstatus);
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if (WIFEXITED(res.waitstatus))
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return WEXITSTATUS(res.waitstatus);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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