/* vi: set sw=4 ts=4: */
-/* `time' utility to display resource usage of processes.
+/* 'time' utility to display resource usage of processes.
Copyright (C) 1990, 91, 92, 93, 96 Free Software Foundation, Inc.
- Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* Originally written by David Keppel <pardo@cs.washington.edu>.
Heavily modified by David MacKenzie <djm@gnu.ai.mit.edu>.
Heavily modified for busybox by Erik Andersen <andersen@codepoet.org>
*/
+//usage:#define time_trivial_usage
+//usage: "[-v] PROG ARGS"
+//usage:#define time_full_usage "\n\n"
+//usage: "Run PROG, display resource usage when it exits\n"
+//usage: "\n -v Verbose"
+
#include "libbb.h"
+#include <sys/resource.h> /* getrusage */
/* Information on the resources used by a child process. */
typedef struct {
/* The output format for the -p option .*/
static const char posix_format[] ALIGN1 = "real %e\nuser %U\nsys %S";
-
/* Format string for printing all statistics verbosely.
Keep this output to 24 lines so users on terminals can see it all.*/
static const char long_format[] ALIGN1 =
"\tPage size (bytes): %Z\n"
"\tExit status: %x";
-
/* Wait for and fill in data on child process PID.
Return 0 on error, 1 if ok. */
-
/* pid_t is short on BSDI, so don't try to promote it. */
-static int resuse_end(pid_t pid, resource_t * resp)
+static void resuse_end(pid_t pid, resource_t *resp)
{
- int status;
pid_t caught;
/* Ignore signals, but don't ignore the children. When wait3
- returns the child process, set the time the command finished. */
- while ((caught = wait3(&status, 0, &resp->ru)) != pid) {
- if (caught == -1)
- return 0;
+ * returns the child process, set the time the command finished. */
+ while ((caught = wait3(&resp->waitstatus, 0, &resp->ru)) != pid) {
+ if (caught == -1 && errno != EINTR) {
+ bb_perror_msg("wait");
+ return;
+ }
}
- resp->elapsed_ms = (monotonic_us() / 1000) - resp->elapsed_ms;
- resp->waitstatus = status;
- return 1;
+ resp->elapsed_ms = monotonic_ms() - resp->elapsed_ms;
}
-/* Print ARGV, with each entry in ARGV separated by FILLER. */
-static void printargv(char *const *argv, const char *filler)
+static void printargv(char *const *argv)
{
- fputs(*argv, stdout);
- while (*++argv) {
- fputs(filler, stdout);
- fputs(*argv, stdout);
- }
+ const char *fmt = " %s" + 1;
+ do {
+ printf(fmt, *argv);
+ fmt = " %s";
+ } while (*++argv);
}
/* Return the number of kilobytes corresponding to a number of pages PAGES.
This is funky since the pagesize could be less than 1K.
Note: Some machines express getrusage statistics in terms of K,
others in terms of pages. */
-
-static unsigned long ptok(unsigned long pages)
+static unsigned long ptok(const unsigned pagesize, const unsigned long pages)
{
- static unsigned long ps;
unsigned long tmp;
- /* Initialization. */
- if (ps == 0)
- ps = getpagesize();
-
/* Conversion. */
- if (pages > (LONG_MAX / ps)) { /* Could overflow. */
- tmp = pages / 1024; /* Smaller first, */
- return tmp * ps; /* then larger. */
+ if (pages > (LONG_MAX / pagesize)) { /* Could overflow. */
+ tmp = pages / 1024; /* Smaller first, */
+ return tmp * pagesize; /* then larger. */
}
/* Could underflow. */
- tmp = pages * ps; /* Larger first, */
- return tmp / 1024; /* then smaller. */
+ tmp = pages * pagesize; /* Larger first, */
+ return tmp / 1024; /* then smaller. */
}
/* summarize: Report on the system use of a command.
#define TICKS_PER_SEC 100
#endif
-static void summarize(const char *fmt, char **command, resource_t * resp)
+static void summarize(const char *fmt, char **command, resource_t *resp)
{
unsigned vv_ms; /* Elapsed virtual (CPU) milliseconds */
unsigned cpu_ticks; /* Same, in "CPU ticks" */
+ unsigned pagesize = getpagesize();
+ /* Impossible: we do not use WUNTRACED flag in wait()...
if (WIFSTOPPED(resp->waitstatus))
printf("Command stopped by signal %u\n",
WSTOPSIG(resp->waitstatus));
- else if (WIFSIGNALED(resp->waitstatus))
+ else */
+ if (WIFSIGNALED(resp->waitstatus))
printf("Command terminated by signal %u\n",
WTERMSIG(resp->waitstatus));
else if (WIFEXITED(resp->waitstatus) && WEXITSTATUS(resp->waitstatus))
+ (resp->ru.ru_utime.tv_usec + resp->ru.ru_stime.tv_usec) / 1000;
#if (1000 / TICKS_PER_SEC) * TICKS_PER_SEC == 1000
- /* 1000 is exactly divisible by TICKS_PER_SEC */
+ /* 1000 is exactly divisible by TICKS_PER_SEC (typical) */
cpu_ticks = vv_ms / (1000 / TICKS_PER_SEC);
#else
cpu_ticks = vv_ms * (unsigned long long)TICKS_PER_SEC / 1000;
break;
#endif
case 'C': /* The command that got timed. */
- printargv(command, " ");
+ printargv(command);
break;
case 'D': /* Average unshared data size. */
printf("%lu",
- ptok((UL) resp->ru.ru_idrss) / cpu_ticks +
- ptok((UL) resp->ru.ru_isrss) / cpu_ticks);
+ (ptok(pagesize, (UL) resp->ru.ru_idrss) +
+ ptok(pagesize, (UL) resp->ru.ru_isrss)) / cpu_ticks);
break;
case 'E': { /* Elapsed real (wall clock) time. */
unsigned seconds = resp->elapsed_ms / 1000;
break;
case 'K': /* Average mem usage == data+stack+text. */
printf("%lu",
- ptok((UL) resp->ru.ru_idrss) / cpu_ticks +
- ptok((UL) resp->ru.ru_isrss) / cpu_ticks +
- ptok((UL) resp->ru.ru_ixrss) / cpu_ticks);
+ (ptok(pagesize, (UL) resp->ru.ru_idrss) +
+ ptok(pagesize, (UL) resp->ru.ru_isrss) +
+ ptok(pagesize, (UL) resp->ru.ru_ixrss)) / cpu_ticks);
break;
case 'M': /* Maximum resident set size. */
- printf("%lu", ptok((UL) resp->ru.ru_maxrss));
+ printf("%lu", ptok(pagesize, (UL) resp->ru.ru_maxrss));
break;
case 'O': /* Outputs. */
printf("%lu", resp->ru.ru_oublock);
printf("%lu", resp->ru.ru_nswap);
break;
case 'X': /* Average shared text size. */
- printf("%lu", ptok((UL) resp->ru.ru_ixrss) / cpu_ticks);
+ printf("%lu", ptok(pagesize, (UL) resp->ru.ru_ixrss) / cpu_ticks);
break;
case 'Z': /* Page size. */
- printf("%u", getpagesize());
+ printf("%u", pagesize);
break;
case 'c': /* Involuntary context switches. */
printf("%lu", resp->ru.ru_nivcsw);
printf("%lu", resp->ru.ru_nsignals);
break;
case 'p': /* Average stack segment. */
- printf("%lu", ptok((UL) resp->ru.ru_isrss) / cpu_ticks);
+ printf("%lu", ptok(pagesize, (UL) resp->ru.ru_isrss) / cpu_ticks);
break;
case 'r': /* Incoming socket messages received. */
printf("%lu", resp->ru.ru_msgrcv);
printf("%lu", resp->ru.ru_msgsnd);
break;
case 't': /* Average resident set size. */
- printf("%lu", ptok((UL) resp->ru.ru_idrss) / cpu_ticks);
+ printf("%lu", ptok(pagesize, (UL) resp->ru.ru_idrss) / cpu_ticks);
break;
case 'w': /* Voluntary context switches. */
printf("%lu", resp->ru.ru_nvcsw);
/* Run command CMD and return statistics on it.
Put the statistics in *RESP. */
-static void run_command(char *const *cmd, resource_t * resp)
+static void run_command(char *const *cmd, resource_t *resp)
{
- pid_t pid; /* Pid of child. */
- __sighandler_t interrupt_signal, quit_signal;
-
- resp->elapsed_ms = monotonic_us() / 1000;
- pid = vfork(); /* Run CMD as child process. */
- if (pid < 0)
- bb_error_msg_and_die("cannot fork");
- else if (pid == 0) { /* If child. */
- /* Don't cast execvp arguments; that causes errors on some systems,
- versus merely warnings if the cast is left off. */
- BB_EXECVP(cmd[0], cmd);
- bb_error_msg("cannot run %s", cmd[0]);
- _exit(errno == ENOENT ? 127 : 126);
+ pid_t pid;
+ void (*interrupt_signal)(int);
+ void (*quit_signal)(int);
+
+ resp->elapsed_ms = monotonic_ms();
+ pid = xvfork();
+ if (pid == 0) {
+ /* Child */
+ BB_EXECVP_or_die((char**)cmd);
}
/* Have signals kill the child but not self (if possible). */
+//TODO: just block all sigs? and reenable them in the very end in main?
interrupt_signal = signal(SIGINT, SIG_IGN);
quit_signal = signal(SIGQUIT, SIG_IGN);
- if (resuse_end(pid, resp) == 0)
- bb_error_msg("error waiting for child process");
+ resuse_end(pid, resp);
/* Re-enable signals. */
signal(SIGINT, interrupt_signal);
}
int time_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int time_main(int argc, char **argv)
+int time_main(int argc UNUSED_PARAM, char **argv)
{
resource_t res;
const char *output_format = default_format;
- char c;
-
- goto next;
- /* Parse any options -- don't use getopt() here so we don't
- * consume the args of our client application... */
- while (argc > 0 && argv[0][0] == '-') {
- while ((c = *++*argv)) {
- switch (c) {
- case 'v':
- output_format = long_format;
- break;
- case 'p':
- output_format = posix_format;
- break;
- default:
- bb_show_usage();
- }
- }
- next:
- argv++;
- argc--;
- if (!argc)
- bb_show_usage();
- }
+ int opt;
+
+ opt_complementary = "-1"; /* at least one arg */
+ /* "+": stop on first non-option */
+ opt = getopt32(argv, "+vp");
+ argv += optind;
+ if (opt & 1)
+ output_format = long_format;
+ if (opt & 2)
+ output_format = posix_format;
run_command(argv, &res);
/* Cheat. printf's are shorter :) */
- /* (but see bb_putchar() body for additional wrinkle!) */
- stdout = stderr;
- dup2(2, 1); /* just in case libc does something silly :( */
+ xdup2(STDERR_FILENO, STDOUT_FILENO);
summarize(output_format, argv, &res);
if (WIFSTOPPED(res.waitstatus))
return WTERMSIG(res.waitstatus);
if (WIFEXITED(res.waitstatus))
return WEXITSTATUS(res.waitstatus);
- fflush_stdout_and_exit(0);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
}
projects / oweals / busybox.git / blobdiff