mirror of
https://github.com/golang/go
synced 2024-10-03 07:31:22 -06:00
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
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package runtime
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import "unsafe"
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var (
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writeHeader = []byte{6 /* ANDROID_LOG_ERROR */, 'G', 'o', 0}
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writePath = []byte("/dev/log/main\x00")
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writeFD uintptr
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writeBuf [1024]byte
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writePos int
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)
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func writeErr(b []byte) {
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// Log format: "<priority 1 byte><tag n bytes>\x00<message m bytes>\x00"
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// The entire log needs to be delivered in a single syscall (the NDK
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// does this with writev). Each log is its own line, so we need to
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// buffer writes until we see a newline.
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if writeFD == 0 {
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writeFD = uintptr(open(&writePath[0], 0x1 /* O_WRONLY */, 0))
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if writeFD == 0 {
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// It is hard to do anything here. Write to stderr just
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// in case user has root on device and has run
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// adb shell setprop log.redirect-stdio true
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msg := []byte("runtime: cannot open /dev/log/main\x00")
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write(2, unsafe.Pointer(&msg[0]), int32(len(msg)))
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exit(2)
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}
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copy(writeBuf[:], writeHeader)
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}
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dst := writeBuf[len(writeHeader):]
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for _, v := range b {
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if v == 0 { // android logging won't print a zero byte
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v = '0'
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}
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dst[writePos] = v
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writePos++
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if v == '\n' || writePos == len(dst)-1 {
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dst[writePos] = 0
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write(writeFD, unsafe.Pointer(&writeBuf[0]), int32(len(writeHeader)+writePos))
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memclrBytes(dst)
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writePos = 0
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}
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}
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}
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