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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/time/time.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/time/time.c')
-rw-r--r-- | shell_cmds/time/time.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/shell_cmds/time/time.c b/shell_cmds/time/time.c new file mode 100644 index 0000000..afaaed0 --- /dev/null +++ b/shell_cmds/time/time.c @@ -0,0 +1,245 @@ +/* $NetBSD: time.c,v 1.9 1997/10/20 03:28:21 lukem Exp $ */ + +/* + * Copyright (c) 1987, 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <errno.h> +#include <err.h> +#include <inttypes.h> +#include <langinfo.h> +#include <libproc.h> +#include <locale.h> +#include <sys/cdefs.h> +#include <sysexits.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <sys/wait.h> +#include <signal.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> + +int lflag; +int portableflag; +bool child_running = true; + +void +child_handler(int sig) +{ + child_running = false; +} + +int +main(int argc, char **argv) +{ + int pid; + int ch, status, rusage_ret = -1; + uint64_t before_ns, after_ns, duration_ns, duration_secs, duration_frac_ns; + struct rusage ru; + struct rusage_info_v4 ruinfo; + sigset_t sigmask, suspmask, origmask; + + lflag = 0; + while ((ch = getopt(argc, argv, "lp")) != -1) { + switch((char)ch) { + case 'p': + portableflag = 1; + break; + case 'l': + lflag = 1; + break; + case '?': + default: + fprintf(stderr, "usage: time [-lp] <command>\n"); + exit(1); + } + } + + if (!(argc -= optind)) { + exit(0); + } + argv += optind; + + sigemptyset(&sigmask); + /* + * Block SIGCHLD so that the check for `child_running` doesn't miss the + * handler before calling `sigsuspend` and blocking forever. + */ + sigaddset(&sigmask, SIGCHLD); + sigprocmask(SIG_BLOCK, &sigmask, &origmask); + + /* + * Ensure child signals are handled by the parent prior to fork; otherwise, + * they could be missed between the child forking and calling `sigsuspend`. + */ + (void)signal(SIGCHLD, child_handler); + + sigemptyset(&suspmask); + + before_ns = clock_gettime_nsec_np(CLOCK_UPTIME_RAW); + /* + * NB: Don't add anything between these two lines -- measurement is + * happening now. + */ + switch (pid = vfork()) { + case -1: /* error */ + err(EX_OSERR, "time"); + __builtin_unreachable(); + case 0: /* child */ + /* + * Allow the child to respond to signals by resetting to the original + * signal handling behavior. + */ + (void)sigprocmask(SIG_SETMASK, &origmask, NULL); + execvp(*argv, argv); + perror(*argv); + _exit((errno == ENOENT) ? 127 : 126); + __builtin_unreachable(); + default: /* parent */ + break; + } + + /* + * Let the child handle signals that normally exit. + */ + (void)signal(SIGINT, SIG_IGN); + (void)signal(SIGQUIT, SIG_IGN); + + while (child_running) { + /* + * This would be racy, but SIGCHLD is blocked above (as part of + * `sigmask`. + */ + sigsuspend(&suspmask); + } + /* + * NB: Minimize what's added between these statements to preserve the + * accuracy of the time measurement. + */ + after_ns = clock_gettime_nsec_np(CLOCK_UPTIME_RAW); + if (lflag) { + rusage_ret = proc_pid_rusage(pid, RUSAGE_INFO_V4, (void **)&ruinfo); + } + while (wait3(&status, 0, &ru) != pid) { + } + if (!WIFEXITED(status)) { + fprintf(stderr, "Command terminated abnormally.\n"); + } + duration_ns = after_ns - before_ns; + duration_secs = duration_ns / (1000 * 1000 * 1000); + duration_frac_ns = duration_ns - (duration_secs * 1000 * 1000 * 1000); + + if (portableflag) { + char *radix = NULL; + + setlocale(LC_ALL, ""); + + radix = nl_langinfo(RADIXCHAR); + if (!radix || radix[0] == '\0') { + radix = "."; + } + + fprintf(stderr, "real %9" PRIu64 "%s%02" PRIu64 "\n", + duration_secs, radix, duration_frac_ns / (10 * 1000 * 1000)); + fprintf(stderr, "user %9ld%s%02ld\n", + (long)ru.ru_utime.tv_sec, radix, (long)ru.ru_utime.tv_usec/10000); + fprintf(stderr, "sys %9ld%s%02ld\n", + (long)ru.ru_stime.tv_sec, radix, (long)ru.ru_stime.tv_usec/10000); + } else { + fprintf(stderr, "%9" PRIu64 ".%02" PRIu64 " real ", + duration_secs, duration_frac_ns / (10 * 1000 * 1000)); + fprintf(stderr, "%9ld.%02ld user ", + (long)ru.ru_utime.tv_sec, (long)ru.ru_utime.tv_usec/10000); + fprintf(stderr, "%9ld.%02ld sys\n", + (long)ru.ru_stime.tv_sec, (long)ru.ru_stime.tv_usec/10000); + } + + if (lflag) { + int hz = 100; /* XXX */ + long ticks; + + ticks = hz * (ru.ru_utime.tv_sec + ru.ru_stime.tv_sec) + + hz * (ru.ru_utime.tv_usec + ru.ru_stime.tv_usec) / 1000000; + + fprintf(stderr, "%20ld %s\n", + ru.ru_maxrss, "maximum resident set size"); + fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_ixrss / ticks : 0, + "average shared memory size"); + fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_idrss / ticks : 0, + "average unshared data size"); + fprintf(stderr, "%20ld %s\n", ticks ? ru.ru_isrss / ticks : 0, + "average unshared stack size"); + fprintf(stderr, "%20ld %s\n", + ru.ru_minflt, "page reclaims"); + fprintf(stderr, "%20ld %s\n", + ru.ru_majflt, "page faults"); + fprintf(stderr, "%20ld %s\n", + ru.ru_nswap, "swaps"); + fprintf(stderr, "%20ld %s\n", + ru.ru_inblock, "block input operations"); + fprintf(stderr, "%20ld %s\n", + ru.ru_oublock, "block output operations"); + fprintf(stderr, "%20ld %s\n", + ru.ru_msgsnd, "messages sent"); + fprintf(stderr, "%20ld %s\n", + ru.ru_msgrcv, "messages received"); + fprintf(stderr, "%20ld %s\n", + ru.ru_nsignals, "signals received"); + fprintf(stderr, "%20ld %s\n", + ru.ru_nvcsw, "voluntary context switches"); + fprintf(stderr, "%20ld %s\n", + ru.ru_nivcsw, "involuntary context switches"); + + if (rusage_ret >= 0) { + if (ruinfo.ri_instructions > 0) { + fprintf(stderr, "%20" PRIu64 " %s\n", ruinfo.ri_instructions, + "instructions retired"); + } + if (ruinfo.ri_cycles > 0) { + fprintf(stderr, "%20" PRIu64 " %s\n", ruinfo.ri_cycles, + "cycles elapsed"); + } + if (ruinfo.ri_lifetime_max_phys_footprint > 0) { + fprintf(stderr, "%20" PRIu64 " %s\n", + ruinfo.ri_lifetime_max_phys_footprint, + "peak memory footprint"); + } + } + } + + exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE); +} |