libgo: Export {enter,exit}syscall and use it for getaddrinfo.

From-SVN: r185363

libgo/go/net/cgo_unix.go

@@ -75,7 +75,10 @@ func cgoLookupPort(net, service string) (port int, err error, completed bool) {
 	}
 
 	s := syscall.StringBytePtr(service)
-	if libc_getaddrinfo(nil, s, &hints, &res) == 0 {
+	syscall.Entersyscall()
+	gerrno := libc_getaddrinfo(nil, s, &hints, &res)
+	syscall.Exitsyscall()
+	if gerrno == 0 {
 		defer libc_freeaddrinfo(res)
 		for r := res; r != nil; r = r.Ai_next {
 			switch r.Ai_family {
@@ -108,7 +111,9 @@ func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err error, complet
 	hints.Ai_flags = int32((syscall.AI_ALL | syscall.AI_V4MAPPED | syscall.AI_CANONNAME) & cgoAddrInfoMask())
 
 	h := syscall.StringBytePtr(name)
+	syscall.Entersyscall()
 	gerrno := libc_getaddrinfo(h, nil, &hints, &res)
+	syscall.Exitsyscall()
 	if gerrno != 0 {
 		var str string
 		if gerrno == syscall.EAI_NONAME {

libgo/go/syscall/libcall_linux.go

@@ -202,13 +202,13 @@ func Getdents(fd int, buf []byte) (n int, err error) {
 	} else {
 		p = (*byte)(unsafe.Pointer(&_zero))
 	}
-	entersyscall()
+	Entersyscall()
 	r1, _, errno := Syscall(SYS_GETDENTS64, uintptr(fd), uintptr(unsafe.Pointer(p)), uintptr(len(buf)))
 	n = int(r1)
 	if n < 0 {
 		err = errno
 	}
-	exitsyscall()
+	Exitsyscall()
 	return
 }
 

libgo/go/syscall/libcall_support.go

@@ -6,7 +6,7 @@
 
 package syscall
 
-func entersyscall()
-func exitsyscall()
+func Entersyscall()
+func Exitsyscall()
 func GetErrno() Errno
 func SetErrno(Errno)

libgo/go/syscall/mksyscall.awk

@@ -190,7 +190,7 @@ BEGIN {
     }
 
     if (blocking) {
-	print "\tentersyscall()"
+	print "\tEntersyscall()"
     }
 
     printf("\t")
@@ -240,7 +240,7 @@ BEGIN {
     }
 
     if (blocking) {
-	print "\texitsyscall()"
+	print "\tExitsyscall()"
     }
 
     if (gofnresults != "") {

libgo/go/syscall/syscall_unix.go

@@ -30,7 +30,7 @@ const darwinAMD64 = runtime.GOOS == "darwin" && runtime.GOARCH == "amd64"
 // the arguments, so that we don't pass a 64-bit value when the function
 // expects a 32-bit one.
 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
-	entersyscall()
+	Entersyscall()
 	var r uintptr
 	if unsafe.Sizeof(r) == 4 {
 		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3), 0, 0, 0)
@@ -40,12 +40,12 @@ func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
 		r = uintptr(r1)
 	}
 	err = GetErrno()
-	exitsyscall()
+	Exitsyscall()
 	return r, 0, err
 }
 
 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
-	entersyscall()
+	Entersyscall()
 	var r uintptr
 	if unsafe.Sizeof(r) == 4 {
 		r1 := c_syscall32(int32(trap), int32(a1), int32(a2), int32(a3),
@@ -57,7 +57,7 @@ func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
 		r = uintptr(r1)
 	}
 	err = GetErrno()
-	exitsyscall()
+	Exitsyscall()
 	return r, 0, err
 }
 

libgo/runtime/runtime.h

@@ -298,8 +298,8 @@ void	runtime_gosched(void);
 void	runtime_tsleep(int64);
 M*	runtime_newm(void);
 void	runtime_goexit(void);
-void	runtime_entersyscall(void) __asm__("libgo_syscall.syscall.entersyscall");
-void	runtime_exitsyscall(void) __asm__("libgo_syscall.syscall.exitsyscall");
+void	runtime_entersyscall(void) __asm__("libgo_syscall.syscall.Entersyscall");
+void	runtime_exitsyscall(void) __asm__("libgo_syscall.syscall.Exitsyscall");
 void	siginit(void);
 bool	__go_sigsend(int32 sig);
 int32	runtime_callers(int32, uintptr*, int32);