407f3ea3c0
This uses ioctl syscalls or appropriate alternative, to detect if stdin/out/err are character devices or not. This caches the result, to ensure performance is ok at runtime as executing stat can approach microsecond overhead. Signed-off-by: Adrian Cole <adrian@tetrate.io>
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// Package platform includes runtime-specific code needed for the compiler or otherwise.
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//
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// Note: This is a dependency-free alternative to depending on parts of Go's x/sys.
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// See /RATIONALE.md for more context.
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package platform
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import (
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"errors"
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"io"
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"runtime"
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)
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// CompilerSupported is exported for tests and includes constraints here and also the assembler.
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func CompilerSupported() bool {
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switch runtime.GOOS {
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case "darwin", "windows", "linux", "freebsd":
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default:
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return false
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}
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switch runtime.GOARCH {
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case "amd64", "arm64":
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default:
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return false
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}
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return true
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}
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// MmapCodeSegment copies the code into the executable region and returns the byte slice of the region.
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//
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// See https://man7.org/linux/man-pages/man2/mmap.2.html for mmap API and flags.
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func MmapCodeSegment(code io.Reader, size int) ([]byte, error) {
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if size == 0 {
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panic(errors.New("BUG: MmapCodeSegment with zero length"))
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}
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if runtime.GOARCH == "amd64" {
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return mmapCodeSegmentAMD64(code, size)
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} else {
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return mmapCodeSegmentARM64(code, size)
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}
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}
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// MunmapCodeSegment unmaps the given memory region.
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func MunmapCodeSegment(code []byte) error {
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if len(code) == 0 {
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panic(errors.New("BUG: MunmapCodeSegment with zero length"))
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}
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return munmapCodeSegment(code)
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}
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// IsTerminal returns true if the given file descriptor is a terminal.
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func IsTerminal(fd uintptr) bool {
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return isTerminal(fd)
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}
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