pkg syscall (openbsd-386-cgo), const SOCK_CLOEXEC = 32768
pkg syscall (openbsd-386-cgo), const SOCK_CLOEXEC ideal-int
pkg syscall (openbsd-386-cgo), const SOCK_NONBLOCK = 16384
pkg syscall (openbsd-386-cgo), const SOCK_NONBLOCK ideal-int
pkg syscall (openbsd-386-cgo), const SYS_ACCEPT4 = 93
pkg syscall (openbsd-386-cgo), const SYS_ACCEPT4 ideal-int
pkg syscall (openbsd-386-cgo), const SYS_PIPE2 = 101

pkg syscall (freebsd-386-cgo), type SysProcAttr struct, Ctty int
pkg syscall (freebsd-386-cgo), type SysProcAttr struct, Foreground bool
pkg syscall (freebsd-386-cgo), type SysProcAttr struct, Pgid int
pkg syscall (freebsd-amd64), type SysProcAttr struct, Ctty int
pkg syscall (freebsd-amd64), type SysProcAttr struct, Foreground bool
pkg syscall (freebsd-amd64), type SysProcAttr struct, Pgid int
pkg syscall (freebsd-amd64-cgo), type SysProcAttr struct, Ctty int

pkg syscall (freebsd-arm64-cgo), const AF_ISO = 7
pkg syscall (freebsd-arm64-cgo), const AF_ISO ideal-int
pkg syscall (freebsd-arm64-cgo), const AF_LAT = 14
pkg syscall (freebsd-arm64-cgo), const AF_LAT ideal-int
pkg syscall (freebsd-arm64-cgo), const AF_LINK = 18
pkg syscall (freebsd-arm64-cgo), const AF_LINK ideal-int
pkg syscall (freebsd-arm64-cgo), const AF_LOCAL = 1

pkg log/syslog (linux-386-cgo), const LOG_LOCAL7 Priority
pkg log/syslog (linux-386-cgo), const LOG_LPR = 48
pkg log/syslog (linux-386-cgo), const LOG_LPR Priority
pkg log/syslog (linux-386-cgo), const LOG_MAIL = 16
pkg log/syslog (linux-386-cgo), const LOG_MAIL Priority
pkg log/syslog (linux-386-cgo), const LOG_NEWS = 56
pkg log/syslog (linux-386-cgo), const LOG_NEWS Priority

pkg syscall (darwin-amd64-cgo), func CheckBpfVersion //deprecated
pkg syscall (darwin-amd64-cgo), func FlushBpf //deprecated
pkg syscall (darwin-amd64-cgo), func ParseRoutingMessage //deprecated
pkg syscall (darwin-amd64-cgo), func ParseRoutingSockaddr //deprecated
pkg syscall (darwin-amd64-cgo), func RouteRIB //deprecated
pkg syscall (darwin-amd64-cgo), func SetBpf //deprecated

The stanza

	// #include <gmp.h>
	import "C"

is a signal to cgo.  The doc comment on the import of "C" provides
additional context for the C file.  Here it is just a single #include
but it could contain arbitrary C definitions to be imported and used.

Cgo recognizes any use of a qualified identifier C.xxx and uses gcc to
find the definition of xxx.  If xxx is a type, cgo replaces C.xxx with

pkg syscall (freebsd-386-cgo), type Dirent struct, Off int64
pkg syscall (freebsd-386-cgo), type Dirent struct, Pad0 uint8
pkg syscall (freebsd-386-cgo), type Dirent struct, Pad1 uint16
pkg syscall (freebsd-386-cgo), type Stat_t struct, Atim_ext int32
pkg syscall (freebsd-386-cgo), type Stat_t struct, Blksize int32
pkg syscall (freebsd-386-cgo), type Stat_t struct, Btim_ext int32

pkg syscall (linux-386-cgo), type SysProcAttr struct, GidMappings []SysProcIDMap
pkg syscall (linux-386-cgo), type SysProcAttr struct, UidMappings []SysProcIDMap
pkg syscall (linux-386-cgo), type SysProcIDMap struct
pkg syscall (linux-386-cgo), type SysProcIDMap struct, ContainerID int
pkg syscall (linux-386-cgo), type SysProcIDMap struct, HostID int
pkg syscall (linux-386-cgo), type SysProcIDMap struct, Size int

## Tools {#tools}

### Go command {#go-command}

Android
=======

For details on developing Go for Android, see the documentation in the
mobile subrepository:

	https://github.com/golang/mobile

To run the standard library tests, enable Cgo and use an appropriate
C compiler from the Android NDK. For example,

	CGO_ENABLED=1 \
	GOOS=android \
	GOARCH=arm64 \
	CC_FOR_TARGET=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android21-clang \
	./all.bash