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// SPDX-FileCopyrightText: © 2021 Grégoire Duchêne <gduchene@awhk.org>
// SPDX-License-Identifier: ISC
//go:build linux && !nosystemd
package gosdd
// #cgo LDFLAGS: -lsystemd
// #include <stdlib.h>
// #include <string.h>
// #include <systemd/sd-daemon.h>
import "C"
import (
"os"
"syscall"
"unsafe"
)
func sdListenFDs(unsetenv bool) ([]*os.File, error) {
i := C.int(0)
if unsetenv {
i = C.int(1)
}
c := C.sd_listen_fds(i)
if c < 0 {
return nil, syscall.Errno(-c)
}
if c == 0 {
return nil, nil
}
fds := make([]*os.File, 0, c)
for fd := uintptr(C.SD_LISTEN_FDS_START); fd < uintptr(C.SD_LISTEN_FDS_START+c); fd++ {
fds = append(fds, os.NewFile(fd, ""))
}
return fds, nil
}
func sdListenFDsWithNames(unsetenv bool) (map[string]*os.File, error) {
i := C.int(0)
if unsetenv {
i = C.int(1)
}
var arr **C.char
c := C.sd_listen_fds_with_names(i, &arr)
if c < 0 {
return nil, syscall.Errno(-c)
}
if c == 0 {
return nil, nil
}
// See https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices.
names := (*[1 << 28]*C.char)(unsafe.Pointer(arr))[:c:c]
fds := make(map[string]*os.File)
for fd := uintptr(C.SD_LISTEN_FDS_START); fd < uintptr(C.SD_LISTEN_FDS_START+c); fd++ {
name := C.GoString(names[int(fd-C.SD_LISTEN_FDS_START)])
fds[name] = os.NewFile(fd, name)
C.free(unsafe.Pointer(names[int(fd-C.SD_LISTEN_FDS_START)]))
}
C.free(unsafe.Pointer(arr))
return fds, nil
}
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