syscalls: annotate Sendfile() for race detector

Fixes #4306.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/6816054

src/pkg/syscall/syscall_darwin.go

@@ -97,7 +97,7 @@ func Pipe(p []int) (err error) {
 }
 
 // TODO
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	return -1, ENOSYS
 }
 
@@ -334,7 +334,7 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 // __pthread_canceled
 // __semwait_signal
 // Proc_info
-// Sendfile
+// sendfile
 // Stat64_extended
 // Lstat64_extended
 // Fstat64_extended

src/pkg/syscall/syscall_freebsd_386.go

@@ -43,7 +43,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var writtenOut uint64 = 0
 	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr((*offset)>>32), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0)
 

src/pkg/syscall/syscall_freebsd_amd64.go

@@ -43,7 +43,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var writtenOut uint64 = 0
 	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0, 0)
 

src/pkg/syscall/syscall_freebsd_arm.go

@@ -43,7 +43,7 @@ func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	var writtenOut uint64 = 0
 	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr((*offset)>>32), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0)
 

src/pkg/syscall/syscall_linux_386.go

@@ -41,7 +41,7 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
 //sys	Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
 //sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
-//sys	Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
+//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
 //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
 //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
 //sysnb	Setgid(gid int) (err error) = SYS_SETGID32

src/pkg/syscall/syscall_linux_amd64.go

@@ -23,7 +23,7 @@ package syscall
 //sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
-//sys	Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
+//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
 //sysnb	Setgid(gid int) (err error)

src/pkg/syscall/syscall_linux_arm.go

@@ -55,7 +55,7 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error)
 //sys	Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
 //sys	Listen(s int, n int) (err error)
 //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
-//sys	Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
+//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
 //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
 //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32

src/pkg/syscall/syscall_netbsd.go

@@ -133,7 +133,7 @@ func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
 }
 
 // TODO
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	return -1, ENOSYS
 }
 

src/pkg/syscall/syscall_openbsd.go

@@ -91,7 +91,7 @@ func Pipe(p []int) (err error) {
 }
 
 // TODO
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	return -1, ENOSYS
 }
 

src/pkg/syscall/syscall_unix.go

@@ -143,4 +143,11 @@ func Write(fd int, p []byte) (n int, err error) {
 	return write(fd, p)
 }
 
+func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+	if raceenabled {
+		raceReleaseMerge(unsafe.Pointer(&ioSync))
+	}
+	return sendfile(outfd, infd, offset, count)
+}
+
 var ioSync int64

src/pkg/syscall/zsyscall_linux_386.go

@@ -1371,7 +1371,7 @@ func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	r0, _, e1 := Syscall6(SYS_SENDFILE64, uintptr(outfd), uintptr(infd), uintptr(unsafe.Pointer(offset)), uintptr(count), 0, 0)
 	written = int(r0)
 	if e1 != 0 {

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -1423,7 +1423,7 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	r0, _, e1 := Syscall6(SYS_SENDFILE, uintptr(outfd), uintptr(infd), uintptr(unsafe.Pointer(offset)), uintptr(count), 0, 0)
 	written = int(r0)
 	if e1 != 0 {

src/pkg/syscall/zsyscall_linux_arm.go

@@ -1484,7 +1484,7 @@ func Lstat(path string, stat *Stat_t) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
 	r0, _, e1 := Syscall6(SYS_SENDFILE64, uintptr(outfd), uintptr(infd), uintptr(unsafe.Pointer(offset)), uintptr(count), 0, 0)
 	written = int(r0)
 	if e1 != 0 {