func getSlice() (slice string, err error) {
libname := C.CString("libsystemd.so")
defer C.free(unsafe.Pointer(libname))
handle := C.dlopen(libname, C.RTLD_LAZY)
if handle == nil {
err = fmt.Errorf("error opening libsystemd.so")
return
}
defer func() {
if r := C.dlclose(handle); r != 0 {
err = fmt.Errorf("error closing libsystemd.so")
}
}()
sym := C.CString("sd_pid_get_slice")
defer C.free(unsafe.Pointer(sym))
sd_pid_get_slice := C.dlsym(handle, sym)
if sd_pid_get_slice == nil {
err = fmt.Errorf("error resolving sd_pid_get_slice function")
return
}
var s string
sl := C.CString(s)
defer C.free(unsafe.Pointer(sl))
ret := C.my_sd_pid_get_slice(sd_pid_get_slice, 0, &sl)
if ret < 0 {
err = fmt.Errorf("error calling sd_pid_get_slice: %v", syscall.Errno(-ret))
return
}
slice = C.GoString(sl)
return
}
// GetRunningSlice attempts to retrieve the name of the systemd slice in which
// the current process is running.
// This function is a wrapper around the libsystemd C library; if it cannot be
// opened, an error is returned.
func GetRunningSlice() (slice string, err error) {
var h *libHandle
h, err = getHandle()
if err != nil {
return
}
defer func() {
if err1 := h.Close(); err1 != nil {
err = err1
}
}()
sym := C.CString("sd_pid_get_slice")
defer C.free(unsafe.Pointer(sym))
sd_pid_get_slice := C.dlsym(h.handle, sym)
if sd_pid_get_slice == nil {
err = fmt.Errorf("error resolving sd_pid_get_slice function")
return
}
var s string
sl := C.CString(s)
defer C.free(unsafe.Pointer(sl))
ret := C.my_sd_pid_get_slice(sd_pid_get_slice, 0, &sl)
if ret < 0 {
err = fmt.Errorf("error calling sd_pid_get_slice: %v", syscall.Errno(-ret))
return
}
return C.GoString(sl), nil
}
// GetRunningSlice attempts to retrieve the name of the systemd slice in which
// the current process is running.
// This function is a wrapper around the libsystemd C library; if it cannot be
// opened, an error is returned.
func GetRunningSlice() (slice string, err error) {
var h *dlopen.LibHandle
h, err = dlopen.GetHandle(libsystemdNames)
if err != nil {
return
}
defer func() {
if err1 := h.Close(); err1 != nil {
err = err1
}
}()
sd_pid_get_slice, err := h.GetSymbolPointer("sd_pid_get_slice")
if err != nil {
return
}
var s string
sl := C.CString(s)
defer C.free(unsafe.Pointer(sl))
ret := C.my_sd_pid_get_slice(sd_pid_get_slice, 0, &sl)
if ret < 0 {
err = fmt.Errorf("error calling sd_pid_get_slice: %v", syscall.Errno(-ret))
return
}
return C.GoString(sl), nil
}