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Add posix_spawn (#114)

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Justine Tunney 2021-03-07 20:14:07 -08:00
parent 5f088cec23
commit 5ce83b08c8
10 changed files with 521 additions and 22 deletions
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test/libc/stdio/spawn_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.internal.h"
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/fmt/conv.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/spawn.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
TEST(spawn, test) {
int rc, ws, pid;
char *prog = (char *)getauxval(AT_EXECFN);
char *args[] = {program_invocation_name, NULL};
char *envs[] = {"THE_DOGE=42", NULL};
if (atoi(nulltoempty(getenv("THE_DOGE"))) == 42) exit(42);
EXPECT_EQ(0, posix_spawn(&pid, prog, NULL, NULL, args, envs));
EXPECT_NE(-1, waitpid(pid, &ws, 0));
EXPECT_TRUE(WIFEXITED(ws));
EXPECT_EQ(42, WEXITSTATUS(ws));
}
/*
* BEST LINUX FORK+EXEC+EXIT+WAIT PERFORMANCE
* The fastest it can go with fork() is 40µs
* The fastest it can go with vfork() is 26µs
*/
void BenchmarkProcessLifecycle(void) {
int rc, ws, pid;
char *prog = "/tmp/tiny64";
char *args[] = {"tiny64", NULL};
char *envs[] = {NULL};
ASSERT_EQ(0, posix_spawn(&pid, prog, NULL, NULL, args, envs));
ASSERT_NE(-1, waitpid(pid, &ws, 0));
ASSERT_TRUE(WIFEXITED(ws));
ASSERT_EQ(42, WEXITSTATUS(ws));
}
const char kTinyLinuxExit[128] = {
0x7f, 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01, 0x00, // ⌂ELF☻☺☺ 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //         
0x02, 0x00, 0x3e, 0x00, 0x01, 0x00, 0x00, 0x00, // ☻ > ☺   
0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // x @     
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // @       
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //         
0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, //     @ 8 
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // ☺       
0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, // ☺   ♣   
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //         
0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, //   @     
0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, //   @     
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Ç       
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Ç       
0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, //  ►      
0x6a, 0x2a, 0x5f, 0x6a, 0x3c, 0x58, 0x0f, 0x05, // j*_j<X☼♣
};
BENCH(spawn, bench) {
int fd;
if (IsLinux()) {
fd = open("/tmp/tiny64", O_CREAT | O_TRUNC | O_WRONLY, 0755);
write(fd, kTinyLinuxExit, 128);
close(fd);
EZBENCH2("spawn", donothing, BenchmarkProcessLifecycle());
unlink("/tmp/tiny64");
}
}