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// Package ext provides wrappers around nonportable system interfaces.
package ext
import (
"encoding/json"
"iter"
"math"
"strconv"
)
// checked in container/seccomp
type (
// Uint is equivalent to C.uint.
Uint = uint32
// Int is equivalent to C.int.
Int = int32
)
// Integer limit values.
const (
MaxUint = math.MaxUint32
MaxInt = math.MaxInt32
)
// SyscallNum represents an architecture-specific, Linux syscall number.
type SyscallNum Int
// Syscalls returns an iterator over all wired syscalls.
func Syscalls() iter.Seq2[string, SyscallNum] {
return func(yield func(string, SyscallNum) bool) {
for name, num := range syscallNum {
if !yield(name, num) {
return
}
}
for name, num := range syscallNumExtra {
if !yield(name, num) {
return
}
}
}
}
// SyscallResolveName resolves a syscall number from its string representation.
func SyscallResolveName(name string) (num SyscallNum, ok bool) {
if num, ok = syscallNum[name]; ok {
return
}
num, ok = syscallNumExtra[name]
return
}
// MarshalJSON resolves the name of [Syscall] and encodes it as a [json] string.
// If such a name does not exist, the syscall number is encoded instead.
func (num *SyscallNum) MarshalJSON() ([]byte, error) {
n := *num
for name, cur := range Syscalls() {
if cur == n {
return json.Marshal(name)
}
}
return json.Marshal(n)
}
// SyscallNameError is returned when trying to unmarshal an invalid syscall name into [ScmpSyscall].
type SyscallNameError string
func (e SyscallNameError) Error() string {
return "invalid syscall name " + strconv.Quote(string(e))
}
// UnmarshalJSON looks up the syscall number corresponding to name encoded in data
// by calling [SyscallResolveName].
func (num *SyscallNum) UnmarshalJSON(data []byte) error {
var name string
if err := json.Unmarshal(data, &name); err != nil {
return err
}
if n, ok := SyscallResolveName(name); !ok {
return SyscallNameError(name)
} else {
*num = n
return nil
}
}
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