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child_process: add 'overlapped' stdio flag
The 'overlapped' value sets the UV_OVERLAPPED_PIPE libuv flag in the child process stdio. Fixes: #29238 PR-URL: #29412 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
| #include <stdlib.h> | ||
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| #include <errno.h> | ||
| #include <unistd.h> | ||
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| static size_t r(char* buf, size_t buf_size) { | ||
| ssize_t read_count; | ||
| do | ||
| read_count = read(0, buf, buf_size); | ||
| while (read_count < 0 && errno == EINTR); | ||
| if (read_count <= 0) | ||
| abort(); | ||
| return (size_t)read_count; | ||
| } | ||
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| static void w(const char* buf, size_t count) { | ||
| const char* end = buf + count; | ||
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| while (buf < end) { | ||
| ssize_t write_count; | ||
| do | ||
| write_count = write(1, buf, count); | ||
| while (write_count < 0 && errno == EINTR); | ||
| if (write_count <= 0) | ||
| abort(); | ||
| buf += write_count; | ||
| } | ||
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| fprintf(stderr, "%zu", count); | ||
| fflush(stderr); | ||
| } | ||
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| int main(void) { | ||
| w("0", 1); | ||
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| while (1) { | ||
| char buf[256]; | ||
| size_t read_count = r(buf, sizeof(buf)); | ||
| // The JS part (test-child-process-stdio-overlapped.js) only writes the | ||
| // "exit" string when the buffer is empty, so the read is guaranteed to be | ||
| // atomic due to it being less than PIPE_BUF. | ||
| if (!strncmp(buf, "exit", read_count)) { | ||
| break; | ||
| } | ||
| w(buf, read_count); | ||
| } | ||
|
|
||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
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| #include <windows.h> | ||
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| static char buf[256]; | ||
| static DWORD read_count; | ||
| static DWORD write_count; | ||
| static HANDLE stdin_h; | ||
| static OVERLAPPED stdin_o; | ||
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| static void die(const char* buf) { | ||
| fprintf(stderr, "%s\n", buf); | ||
| fflush(stderr); | ||
| exit(100); | ||
| } | ||
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| static void overlapped_read(void) { | ||
| if (ReadFile(stdin_h, buf, sizeof(buf), NULL, &stdin_o)) { | ||
| // Since we start the read operation immediately before requesting a write, | ||
| // it should never complete synchronously since no data would be available | ||
| die("read completed synchronously"); | ||
| } | ||
| if (GetLastError() != ERROR_IO_PENDING) { | ||
| die("overlapped read failed"); | ||
| } | ||
| } | ||
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| static void write(const char* buf, size_t buf_size) { | ||
| overlapped_read(); | ||
| DWORD write_count; | ||
| HANDLE stdout_h = GetStdHandle(STD_OUTPUT_HANDLE); | ||
| if (!WriteFile(stdout_h, buf, buf_size, &write_count, NULL)) { | ||
| die("overlapped write failed"); | ||
| } | ||
| fprintf(stderr, "%d", write_count); | ||
| fflush(stderr); | ||
| } | ||
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| int main(void) { | ||
| HANDLE event = CreateEvent(NULL, FALSE, FALSE, NULL); | ||
| if (event == NULL) { | ||
| die("failed to create event handle"); | ||
| } | ||
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| stdin_h = GetStdHandle(STD_INPUT_HANDLE); | ||
| stdin_o.hEvent = event; | ||
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| write("0", 1); | ||
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| while (1) { | ||
| DWORD result = WaitForSingleObject(event, INFINITE); | ||
| if (result == WAIT_OBJECT_0) { | ||
| if (!GetOverlappedResult(stdin_h, &stdin_o, &read_count, FALSE)) { | ||
| die("failed to get overlapped read result"); | ||
| } | ||
| if (strncmp(buf, "exit", read_count) == 0) { | ||
| break; | ||
| } | ||
| write(buf, read_count); | ||
| } else { | ||
| char emsg[0xfff]; | ||
| int ecode = GetLastError(); | ||
| DWORD rv = FormatMessage( | ||
| FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, | ||
| NULL, | ||
| ecode, | ||
| MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), | ||
| (LPSTR)emsg, | ||
| sizeof(emsg), | ||
| NULL); | ||
| if (rv > 0) { | ||
| snprintf(emsg, sizeof(emsg), | ||
| "WaitForSingleObject failed. Error %d (%s)", ecode, emsg); | ||
| } else { | ||
| snprintf(emsg, sizeof(emsg), | ||
| "WaitForSingleObject failed. Error %d", ecode); | ||
| } | ||
| die(emsg); | ||
| } | ||
| } | ||
|
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||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Test for "overlapped" stdio option. This test uses the "overlapped-checker" | ||
| // helper program which basically a specialized echo program. | ||
| // | ||
| // The test has two goals: | ||
| // | ||
| // - Verify that overlapped I/O works on windows. The test program will deadlock | ||
| // if stdin doesn't have the FILE_FLAG_OVERLAPPED flag set on startup (see | ||
| // test/overlapped-checker/main_win.c for more details). | ||
| // - Verify that "overlapped" stdio option works transparently as a pipe (on | ||
| // unix/windows) | ||
| // | ||
| // This is how the test works: | ||
| // | ||
| // - This script assumes only numeric strings are written to the test program | ||
| // stdout. | ||
| // - The test program will be spawned with "overlapped" set on stdin and "pipe" | ||
| // set on stdout/stderr and at startup writes a number to its stdout | ||
| // - When this script receives some data, it will parse the number, add 50 and | ||
| // write to the test program's stdin. | ||
| // - The test program will then echo the number back to us which will repeat the | ||
| // cycle until the number reaches 200, at which point we send the "exit" | ||
| // string, which causes the test program to exit. | ||
| // - Extra assertion: Every time the test program writes a string to its stdout, | ||
| // it will write the number of bytes written to stderr. | ||
| // - If overlapped I/O is not setup correctly, this test is going to hang. | ||
| 'use strict'; | ||
| const common = require('../common'); | ||
| const assert = require('assert'); | ||
| const path = require('path'); | ||
| const child_process = require('child_process'); | ||
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| const exeExtension = process.platform === 'win32' ? '.exe' : ''; | ||
| const exe = 'overlapped-checker' + exeExtension; | ||
| const exePath = path.join(path.dirname(process.execPath), exe); | ||
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| const child = child_process.spawn(exePath, [], { | ||
| stdio: ['overlapped', 'pipe', 'pipe'] | ||
| }); | ||
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| child.stdin.setEncoding('utf8'); | ||
| child.stdout.setEncoding('utf8'); | ||
| child.stderr.setEncoding('utf8'); | ||
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| function writeNext(n) { | ||
| child.stdin.write((n + 50).toString()); | ||
| } | ||
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| child.stdout.on('data', (s) => { | ||
| const n = Number(s); | ||
| if (n >= 200) { | ||
| child.stdin.write('exit'); | ||
| return; | ||
| } | ||
| writeNext(n); | ||
| }); | ||
|
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| let stderr = ''; | ||
| child.stderr.on('data', (s) => { | ||
| stderr += s; | ||
| }); | ||
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| child.stderr.on('end', common.mustCall(() => { | ||
| // This is the sequence of numbers sent to us: | ||
| // - 0 (1 byte written) | ||
| // - 50 (2 bytes written) | ||
| // - 100 (3 bytes written) | ||
| // - 150 (3 bytes written) | ||
| // - 200 (3 bytes written) | ||
| assert.strictEqual(stderr, '12333'); | ||
| })); | ||
|
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| child.on('exit', common.mustCall((status) => { | ||
| // The test program will return the number of writes as status code. | ||
| assert.strictEqual(status, 0); | ||
| })); |