1// +build linux,cgo 2 3package psx // import "kernel.org/pub/linux/libs/security/libcap/psx" 4 5import ( 6 "runtime" 7 "syscall" 8) 9 10// #cgo LDFLAGS: -lpthread -Wl,-wrap,pthread_create 11// 12// #include <errno.h> 13// #include "psx_syscall.h" 14// 15// long __errno_too(long set_errno) { 16// long v = errno; 17// if (set_errno >= 0) { 18// errno = set_errno; 19// } 20// return v; 21// } 22import "C" 23 24// setErrno returns the current C.errno value and, if v >= 0, sets the 25// CGo errno for a random pthread to value v. If you want some 26// consistency, this needs to be called from runtime.LockOSThread() 27// code. This function is only defined for testing purposes. The psx.c 28// code should properly handle the case that a non-zero errno is saved 29// and restored independently of what these Syscall[36]() functions 30// observe. 31func setErrno(v int) int { 32 return int(C.__errno_too(C.long(v))) 33} 34 35// Syscall3 performs a 3 argument syscall using the libpsx C function 36// psx_syscall3(). Syscall3 differs from syscall.[Raw]Syscall() 37// insofar as it is simultaneously executed on every pthread of the 38// combined Go and CGo runtimes. 39func Syscall3(syscallnr, arg1, arg2, arg3 uintptr) (uintptr, uintptr, syscall.Errno) { 40 runtime.LockOSThread() 41 defer runtime.UnlockOSThread() 42 43 v := C.psx_syscall3(C.long(syscallnr), C.long(arg1), C.long(arg2), C.long(arg3)) 44 var errno syscall.Errno 45 if v < 0 { 46 errno = syscall.Errno(C.__errno_too(-1)) 47 } 48 return uintptr(v), uintptr(v), errno 49} 50 51// Syscall6 performs a 6 argument syscall using the libpsx C function 52// psx_syscall6(). Syscall6 differs from syscall.[Raw]Syscall6() insofar as 53// it is simultaneously executed on every pthread of the combined Go 54// and CGo runtimes. 55func Syscall6(syscallnr, arg1, arg2, arg3, arg4, arg5, arg6 uintptr) (uintptr, uintptr, syscall.Errno) { 56 runtime.LockOSThread() 57 defer runtime.UnlockOSThread() 58 59 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)) 60 var errno syscall.Errno 61 if v < 0 { 62 errno = syscall.Errno(C.__errno_too(-1)) 63 } 64 return uintptr(v), uintptr(v), errno 65} 66