80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// +build linux,cgo
|
|
|
|
package psx // import "kernel.org/pub/linux/libs/security/libcap/psx"
|
|
|
|
import (
|
|
"runtime"
|
|
"syscall"
|
|
)
|
|
|
|
// #cgo LDFLAGS: -lpthread -Wl,-wrap,pthread_create
|
|
//
|
|
// #include <errno.h>
|
|
// #include "psx_syscall.h"
|
|
//
|
|
// long __errno_too(long set_errno) {
|
|
// long v = errno;
|
|
// if (set_errno >= 0) {
|
|
// errno = set_errno;
|
|
// }
|
|
// return v;
|
|
// }
|
|
import "C"
|
|
|
|
// setErrno returns the current C.errno value and, if v >= 0, sets the
|
|
// CGo errno for a random pthread to value v. If you want some
|
|
// consistency, this needs to be called from runtime.LockOSThread()
|
|
// code. This function is only defined for testing purposes. The psx.c
|
|
// code should properly handle the case that a non-zero errno is saved
|
|
// and restored independently of what these Syscall[36]() functions
|
|
// observe.
|
|
func setErrno(v int) int {
|
|
return int(C.__errno_too(C.long(v)))
|
|
}
|
|
|
|
//go:uintptrescapes
|
|
|
|
// Syscall3 performs a 3 argument syscall. Syscall3 differs from
|
|
// syscall.[Raw]Syscall() insofar as it is simultaneously executed on
|
|
// every thread of the combined Go and CGo runtimes. It works
|
|
// differently depending on whether CGO_ENABLED is 1 or 0 at compile
|
|
// time.
|
|
//
|
|
// If CGO_ENABLED=1 it uses the libpsx function C.psx_syscall3().
|
|
//
|
|
// If CGO_ENABLED=0 it redirects to the go1.16+
|
|
// syscall.AllThreadsSyscall() function.
|
|
func Syscall3(syscallnr, arg1, arg2, arg3 uintptr) (uintptr, uintptr, syscall.Errno) {
|
|
// We lock to the OSThread here because we may need errno to
|
|
// be the one for this thread.
|
|
runtime.LockOSThread()
|
|
defer runtime.UnlockOSThread()
|
|
|
|
v := C.psx_syscall3(C.long(syscallnr), C.long(arg1), C.long(arg2), C.long(arg3))
|
|
var errno syscall.Errno
|
|
if v < 0 {
|
|
errno = syscall.Errno(C.__errno_too(-1))
|
|
}
|
|
return uintptr(v), uintptr(v), errno
|
|
}
|
|
|
|
//go:uintptrescapes
|
|
|
|
// Syscall6 performs a 6 argument syscall on every thread of the
|
|
// combined Go and CGo runtimes. Other than the number of syscall
|
|
// arguments, its behavior is identical to that of Syscall3() - see
|
|
// above for the full documentation.
|
|
func Syscall6(syscallnr, arg1, arg2, arg3, arg4, arg5, arg6 uintptr) (uintptr, uintptr, syscall.Errno) {
|
|
// We lock to the OSThread here because we may need errno to
|
|
// be the one for this thread.
|
|
runtime.LockOSThread()
|
|
defer runtime.UnlockOSThread()
|
|
|
|
v := C.psx_syscall6(C.long(syscallnr), C.long(arg1), C.long(arg2), C.long(arg3), C.long(arg4), C.long(arg5), C.long(arg6))
|
|
var errno syscall.Errno
|
|
if v < 0 {
|
|
errno = syscall.Errno(C.__errno_too(-1))
|
|
}
|
|
return uintptr(v), uintptr(v), errno
|
|
}
|