forked from joejulian/gio
Elias Naur
3897832842
It's not given that output to stderr is caused by an error condition. Signed-off-by: Elias Naur <mail@eliasnaur.com>
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package app
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/*
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#cgo LDFLAGS: -llog
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#include <stdlib.h>
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#include <android/log.h>
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*/
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import "C"
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import (
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"bufio"
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"log"
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"os"
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"runtime"
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"syscall"
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"unsafe"
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)
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func init() {
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// Android's logcat already includes timestamps.
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log.SetFlags(log.Flags() &^ log.LstdFlags)
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logFd(os.Stdout.Fd())
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logFd(os.Stderr.Fd())
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}
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func logFd(fd uintptr) {
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r, w, err := os.Pipe()
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if err != nil {
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panic(err)
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}
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if err := syscall.Dup3(int(w.Fd()), int(fd), syscall.O_CLOEXEC); err != nil {
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panic(err)
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}
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go func() {
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tag := C.CString("gio")
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defer C.free(unsafe.Pointer(tag))
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// 1024 is the truncation limit from android/log.h, plus a \n.
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lineBuf := bufio.NewReaderSize(r, 1024)
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// The buffer to pass to C, including the terminating '\0'.
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buf := make([]byte, lineBuf.Size()+1)
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cbuf := (*C.char)(unsafe.Pointer(&buf[0]))
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for {
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line, _, err := lineBuf.ReadLine()
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if err != nil {
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break
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}
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copy(buf, line)
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buf[len(line)] = 0
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C.__android_log_write(C.ANDROID_LOG_INFO, tag, cbuf)
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}
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// The garbage collector doesn't know that w's fd was dup'ed.
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// Avoid finalizing w, and thereby avoid its finalizer closing its fd.
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runtime.KeepAlive(w)
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}()
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}
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