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feat(cgo): map Call non-zero returns to errno

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Co-Authored-By: Virgil <virgil@lethean.io>
This commit is contained in:
Virgil 2026-04-03 19:19:11 +00:00
parent 42d6b0441e
commit f14915e645
2 changed files with 12 additions and 11 deletions
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2
call_test.go
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@ -69,6 +69,8 @@ func TestCallWrapsZeroAndNonZeroReturns(t *testing.T) {
if err := Call(callFailureFunction()); err == nil {
t.Fatalf("expected error, got nil")
} else if !errors.Is(err, syscall.Errno(13)) {
t.Fatalf("expected errno error for return code 13, got %T %v", err, err)
}
}

21
string_conversion.go
View file

@ -43,7 +43,6 @@ int cgo_call_6(uintptr_t fn, uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t
import "C"
import (
"fmt"
"strconv"
"syscall"
"unsafe"
@ -89,7 +88,7 @@ func cIntBitSize() int {
return int(unsafe.Sizeof(C.int(0)) * 8)
}
// Call invokes a C function pointer and maps a non-zero return into a Go error.
// Call invokes a C function pointer and maps a non-zero return into a Go error using errno mapping.
//
// err := cgo.Call(unsafe.Pointer(C.some_function), cgo.SizeT(len(data)))
// err == nil indicates success.
@ -98,18 +97,18 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
panic("cgo.Call: function pointer is nil")
}
var result uintptr
var result C.int
target := uintptr(function)
switch len(args) {
case 0:
result = uintptr(C.cgo_call_0(C.uintptr_t(target)))
result = C.cgo_call_0(C.uintptr_t(target))
case 1:
a0, ok := toSyscallArg(args[0])
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_1(C.uintptr_t(target), C.uintptr_t(a0)))
result = C.cgo_call_1(C.uintptr_t(target), C.uintptr_t(a0))
case 2:
a0, ok := toSyscallArg(args[0])
if !ok {
@ -119,7 +118,7 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_2(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1)))
result = C.cgo_call_2(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1))
case 3:
a0, ok := toSyscallArg(args[0])
if !ok {
@ -133,7 +132,7 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_3(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2)))
result = C.cgo_call_3(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2))
case 4:
a0, ok := toSyscallArg(args[0])
if !ok {
@ -151,7 +150,7 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_4(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3)))
result = C.cgo_call_4(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3))
case 5:
a0, ok := toSyscallArg(args[0])
if !ok {
@ -173,7 +172,7 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_5(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3), C.uintptr_t(a4)))
result = C.cgo_call_5(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3), C.uintptr_t(a4))
case 6:
a0, ok := toSyscallArg(args[0])
if !ok {
@ -199,13 +198,13 @@ func Call(function unsafe.Pointer, args ...interface{}) error {
if !ok {
panic("cgo.Call: unsupported argument type")
}
result = uintptr(C.cgo_call_6(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3), C.uintptr_t(a4), C.uintptr_t(a5)))
result = C.cgo_call_6(C.uintptr_t(target), C.uintptr_t(a0), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3), C.uintptr_t(a4), C.uintptr_t(a5))
default:
panic("cgo.Call: unsupported argument count: max 6")
}
if result != 0 {
return fmt.Errorf("cgo.Call: return code %d", int(result))
return Errno(result)
}
return nil
}