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//go:build linux && !baremetal && !tinygo.wasm
package os
import (
"syscall"
"unsafe"
)
func fork() (pid int32, err error) {
pid = libc_fork()
if pid != 0 {
if errno := *libc_errno(); errno != 0 {
err = syscall.Errno(*libc_errno())
}
}
return
}
// the golang standard library does not expose interfaces for execve and fork, so we define them here the same way via the libc wrapper
func execve(pathname string, argv []string, envv []string) error {
argv0 := cstring(pathname)
// transform argv and envv into the format expected by execve
argv1 := make([]*byte, len(argv)+1)
for i, arg := range argv {
argv1[i] = &cstring(arg)[0]
}
argv1[len(argv)] = nil
env1 := make([]*byte, len(envv)+1)
for i, env := range envv {
env1[i] = &cstring(env)[0]
}
env1[len(envv)] = nil
ret, _, err := syscall.Syscall(syscall.SYS_EXECVE, uintptr(unsafe.Pointer(&argv0[0])), uintptr(unsafe.Pointer(&argv1[0])), uintptr(unsafe.Pointer(&env1[0])))
if int(ret) != 0 {
return err
}
return nil
}
func cstring(s string) []byte {
data := make([]byte, len(s)+1)
copy(data, s)
// final byte should be zero from the initial allocation
return data
}
//export fork
func libc_fork() int32
// Internal musl function to get the C errno pointer.
//
//export __errno_location
func libc_errno() *int32
|
