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@@ -0,0 +1,143 @@
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+// Copyright 2018 The Go Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style
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+// license that can be found in the LICENSE file.
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+
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+// +build ignore
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+
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "os"
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+ "os/exec"
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+ "regexp"
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+ "strconv"
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+ "strings"
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+)
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+
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+var (
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+ goos, goarch string
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+)
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+
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+// cmdLine returns this programs's commandline arguments
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+func cmdLine() string {
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+ return "go run linux/mksysnum.go " + strings.Join(os.Args[1:], " ")
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+}
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+
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+// buildTags returns build tags
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+func buildTags() string {
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+ return fmt.Sprintf("%s,%s", goarch, goos)
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+}
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+
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+func format(name string, num int, offset int) string {
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+ if num > 999 {
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+ // ignore deprecated syscalls that are no longer implemented
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+ // https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h?id=refs/heads/master#n716
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+ return ""
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+ }
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+ name = strings.ToUpper(name)
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+ num = num + offset
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+ return fmt.Sprintf(" SYS_%s = %d;\n", name, num)
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+}
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+
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+func checkErr(err error) {
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+ if err != nil {
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+ fmt.Fprintf(os.Stderr, "%v\n", err)
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+ os.Exit(1)
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+ }
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+}
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+
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+// source string and substring slice for regexp
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+type re struct {
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+ str string // source string
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+ sub []string // matched sub-string
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+}
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+
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+// Match performs regular expression match
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+func (r *re) Match(exp string) bool {
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+ r.sub = regexp.MustCompile(exp).FindStringSubmatch(r.str)
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+ if r.sub != nil {
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+ return true
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+ }
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+ return false
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+}
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+
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+func main() {
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+ // Get the OS and architecture (using GOARCH_TARGET if it exists)
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+ goos = os.Getenv("GOOS")
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+ goarch = os.Getenv("GOARCH_TARGET")
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+ if goarch == "" {
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+ goarch = os.Getenv("GOARCH")
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+ }
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+ // Check if GOOS and GOARCH environment variables are defined
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+ if goarch == "" || goos == "" {
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+ fmt.Fprintf(os.Stderr, "GOARCH or GOOS not defined in environment\n")
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+ os.Exit(1)
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+ }
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+ // Check that we are using the new build system if we should
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+ if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
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+ fmt.Fprintf(os.Stderr, "In the new build system, mksysnum should not be called directly.\n")
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+ fmt.Fprintf(os.Stderr, "See README.md\n")
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+ os.Exit(1)
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+ }
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+
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+ cc := os.Getenv("CC")
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+ if cc == "" {
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+ fmt.Fprintf(os.Stderr, "CC is not defined in environment\n")
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+ os.Exit(1)
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+ }
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+ args := os.Args[1:]
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+ args = append([]string{"-E", "-dD"}, args...)
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+ cmd, err := exec.Command(cc, args...).Output() // execute command and capture output
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+ if err != nil {
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+ fmt.Fprintf(os.Stderr, "can't run %s", cc)
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+ os.Exit(1)
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+ }
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+ text := ""
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+ s := bufio.NewScanner(strings.NewReader(string(cmd)))
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+ var offset, prev int
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+ for s.Scan() {
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+ t := re{str: s.Text()}
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+ if t.Match(`^#define __NR_Linux\s+([0-9]+)`) {
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+ // mips/mips64: extract offset
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+ offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
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+ } else if t.Match(`^#define __NR(\w*)_SYSCALL_BASE\s+([0-9]+)`) {
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+ // arm: extract offset
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+ offset, _ = strconv.Atoi(t.sub[1]) // Make offset=0 if empty or non-numeric
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+ } else if t.Match(`^#define __NR_syscalls\s+`) {
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+ // ignore redefinitions of __NR_syscalls
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+ } else if t.Match(`^#define __NR_(\w*)Linux_syscalls\s+`) {
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+ // mips/mips64: ignore definitions about the number of syscalls
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+ } else if t.Match(`^#define __NR_(\w+)\s+([0-9]+)`) {
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+ prev, err = strconv.Atoi(t.sub[2])
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+ checkErr(err)
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+ text += format(t.sub[1], prev, offset)
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+ } else if t.Match(`^#define __NR3264_(\w+)\s+([0-9]+)`) {
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+ prev, err = strconv.Atoi(t.sub[2])
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+ checkErr(err)
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+ text += format(t.sub[1], prev, offset)
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+ } else if t.Match(`^#define __NR_(\w+)\s+\(\w+\+\s*([0-9]+)\)`) {
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+ r2, err := strconv.Atoi(t.sub[2])
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+ checkErr(err)
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+ text += format(t.sub[1], prev+r2, offset)
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+ } else if t.Match(`^#define __NR_(\w+)\s+\(__NR_(?:SYSCALL_BASE|Linux) \+ ([0-9]+)`) {
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+ r2, err := strconv.Atoi(t.sub[2])
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+ checkErr(err)
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+ text += format(t.sub[1], r2, offset)
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+ }
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+ }
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+ err = s.Err()
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+ checkErr(err)
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+ fmt.Printf(template, cmdLine(), buildTags(), text)
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+}
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+
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+const template = `// %s
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+// Code generated by the command above; see README.md. DO NOT EDIT.
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+
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+// +build %s
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+
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+package unix
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+
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+const(
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+%s)`
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Visweswara R