syscall: SYS_SETGROUPS, SYS_SETUID, SYS_SETGID, SYS_DUP2 not available for Solaris (Illumos)

[kayront]

What version of Go are you using (go version)?

$ go version

go version go1.12.5 solaris/amd64

Does this issue reproduce with the latest release?

Possibly.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/admin/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="solaris"
GOOS="solaris"
GOPATH="/home/admin/go"
GOPROXY=""
GORACE=""
GOROOT="/opt/local/go112"
GOTMPDIR=""
GOTOOLDIR="/opt/local/go112/pkg/tool/solaris_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build234326747=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Attempted to compile dnscrypt-proxy2.

What did you expect to see?

A shiny binary that works on Solaris.

What did you see instead?

Chaos. Failure. Disappointment.

ithub.com/jedisct1/dnscrypt-proxy/vendor/github.com/miekg/dns
github.com/jedisct1/dnscrypt-proxy/vendor/golang.org/x/net/idna
github.com/jedisct1/dnscrypt-proxy/vendor/golang.org/x/net/http/httpguts
github.com/jedisct1/dnscrypt-proxy/vendor/golang.org/x/net/http2
github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy
# github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy
/home/pbulk/build/net/dnscrypt-proxy2/work/src/github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy/privilege_others.go:53:39: undefined: syscall.SYS_SETGROUPS
/home/pbulk/build/net/dnscrypt-proxy2/work/src/github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy/privilege_others.go:56:39: undefined: syscall.SYS_SETGID
/home/pbulk/build/net/dnscrypt-proxy2/work/src/github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy/privilege_others.go:59:39: undefined: syscall.SYS_SETUID
/home/pbulk/build/net/dnscrypt-proxy2/work/src/github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy/privilege_others.go:70:40: undefined: syscall.SYS_DUP2
/home/pbulk/build/net/dnscrypt-proxy2/work/src/github.com/jedisct1/dnscrypt-proxy/dnscrypt-proxy/privilege_others.go:78:40: undefined: syscall.SYS_DUP2
*** Error code 2

[ianlancetaylor]

The syscall package is inherently system dependent. Those constants are not defined on Solaris. There is no simple approach we can take to fix this. If you want your system-dependent code to build on Solaris, you will need to port it to Solaris. Sorry.