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syscall: (*Proc).Call should return nil error when no error occurs

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Fixes #4686.

R=alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/7174047
This commit is contained in:
Shenghou Ma 2013-02-03 01:42:17 +08:00
parent 8047e8e95a
commit dcf16bd83d
1 changed files with 16 additions and 4 deletions
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20
src/pkg/syscall/dll_windows.go
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@ -114,8 +114,14 @@ func (p *Proc) Addr() uintptr {
return p.addr
}
// Call executes procedure p with arguments a.
func (p *Proc) Call(a ...uintptr) (r1, r2 uintptr, err error) {
// Call executes procedure p with arguments a. It will panic, if more then 15 arguments
// are supplied.
//
// The returned error is always non-nil, constructed from the result of GetLastError.
// Callers must inspect the primary return value to decide whether an error occurred
// (according to the semantics of the specific function being called) before consulting
// the error. The error will be guaranteed to contain syscall.Errno.
func (p *Proc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
switch len(a) {
case 0:
return Syscall(p.Addr(), uintptr(len(a)), 0, 0, 0)
@ -260,8 +266,14 @@ func (p *LazyProc) Addr() uintptr {
return p.proc.Addr()
}
// Call executes procedure p with arguments a.
func (p *LazyProc) Call(a ...uintptr) (r1, r2 uintptr, err error) {
// Call executes procedure p with arguments a. It will panic, if more then 15 arguments
// are supplied.
//
// The returned error is always non-nil, constructed from the result of GetLastError.
// Callers must inspect the primary return value to decide whether an error occurred
// (according to the semantics of the specific function being called) before consulting
// the error. The error will be guaranteed to contain syscall.Errno.
func (p *LazyProc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
p.mustFind()
return p.proc.Call(a...)
}