2021-03-08 04:14:07 +00:00
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/dce.h"
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#include "libc/fmt/conv.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/spawn.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/testlib/ezbench.h"
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#include "libc/testlib/testlib.h"
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TEST(spawn, test) {
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int rc, ws, pid;
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2022-04-16 17:40:23 +00:00
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char *prog = GetProgramExecutableName();
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2021-03-08 04:14:07 +00:00
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char *args[] = {program_invocation_name, NULL};
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char *envs[] = {"THE_DOGE=42", NULL};
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if (atoi(nulltoempty(getenv("THE_DOGE"))) == 42) exit(42);
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EXPECT_EQ(0, posix_spawn(&pid, prog, NULL, NULL, args, envs));
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EXPECT_NE(-1, waitpid(pid, &ws, 0));
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EXPECT_TRUE(WIFEXITED(ws));
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EXPECT_EQ(42, WEXITSTATUS(ws));
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}
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/*
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* BEST LINUX FORK+EXEC+EXIT+WAIT PERFORMANCE
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* The fastest it can go with fork() is 40µs
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* The fastest it can go with vfork() is 26µs
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*/
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void BenchmarkProcessLifecycle(void) {
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int rc, ws, pid;
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char *prog = "/tmp/tiny64";
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char *args[] = {"tiny64", NULL};
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char *envs[] = {NULL};
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ASSERT_EQ(0, posix_spawn(&pid, prog, NULL, NULL, args, envs));
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ASSERT_NE(-1, waitpid(pid, &ws, 0));
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ASSERT_TRUE(WIFEXITED(ws));
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ASSERT_EQ(42, WEXITSTATUS(ws));
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}
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const char kTinyLinuxExit[128] = {
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0x7f, 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01, 0x00, // ⌂ELF☻☺☺
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
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0x02, 0x00, 0x3e, 0x00, 0x01, 0x00, 0x00, 0x00, // ☻ > ☺
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2021-03-09 19:21:08 +00:00
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0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // x @
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2021-03-08 04:14:07 +00:00
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0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // @
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
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0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, // @ 8
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // ☺
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0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, // ☺ ♣
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //
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0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // @
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0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // @
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0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Ç
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0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Ç
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0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // ►
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0x6a, 0x2a, 0x5f, 0x6a, 0x3c, 0x58, 0x0f, 0x05, // j*_j<X☼♣
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};
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BENCH(spawn, bench) {
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int fd;
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if (IsLinux()) {
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fd = open("/tmp/tiny64", O_CREAT | O_TRUNC | O_WRONLY, 0755);
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write(fd, kTinyLinuxExit, 128);
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close(fd);
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EZBENCH2("spawn", donothing, BenchmarkProcessLifecycle());
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unlink("/tmp/tiny64");
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}
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}
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