1 files changed, 58 insertions, 0 deletions
diff --git a/src/os/osexec.go b/src/os/osexec.go
new file mode 100644
index 000000000..65e3ab695
--- /dev/null
+++ b/src/os/osexec.go
@@ -0,0 +1,58 @@
+//go:build linux && !baremetal && !tinygo.wasm
+
+package os
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func fork() (pid int32, err error) {
+	pid = libc_fork()
+	if pid != 0 {
+		if errno := *libc_errno(); errno != 0 {
+			err = syscall.Errno(*libc_errno())
+		}
+	}
+	return
+}
+
+// the golang standard library does not expose interfaces for execve and fork, so we define them here the same way via the libc wrapper
+func execve(pathname string, argv []string, envv []string) error {
+	argv0 := cstring(pathname)
+
+	// transform argv and envv into the format expected by execve
+	argv1 := make([]*byte, len(argv)+1)
+	for i, arg := range argv {
+		argv1[i] = &cstring(arg)[0]
+	}
+	argv1[len(argv)] = nil
+
+	env1 := make([]*byte, len(envv)+1)
+	for i, env := range envv {
+		env1[i] = &cstring(env)[0]
+	}
+	env1[len(envv)] = nil
+
+	ret, _, err := syscall.Syscall(syscall.SYS_EXECVE, uintptr(unsafe.Pointer(&argv0[0])), uintptr(unsafe.Pointer(&argv1[0])), uintptr(unsafe.Pointer(&env1[0])))
+	if int(ret) != 0 {
+		return err
+	}
+
+	return nil
+}
+
+func cstring(s string) []byte {
+	data := make([]byte, len(s)+1)
+	copy(data, s)
+	// final byte should be zero from the initial allocation
+	return data
+}
+
+//export fork
+func libc_fork() int32
+
+// Internal musl function to get the C errno pointer.
+//
+//export __errno_location
+func libc_errno() *int32