syscall: add Utimes on Darwin/FreeBSD, add Futimes everywhere

Needed for CL 1103041 and beyond.

R=adg, bradfitzpatrick
CC=bradfitz, golang-dev
https://golang.org/cl/1172042

src/pkg/syscall/mkall.sh

@@ -164,7 +164,13 @@ esac
 
 (
 	if [ -n "$mkerrors" ]; then echo "$mkerrors |gofmt >zerrors_$GOOSARCH.go"; fi
-	if [ -n "$mksyscall" ]; then echo "$mksyscall syscall_$GOOS.go syscall_$GOOSARCH.go |gofmt >zsyscall_$GOOSARCH.go"; fi
+	syscall_goos="syscall_$GOOS.go"
+	case "$GOOS" in
+	darwin | freebsd)
+		syscall_goos="syscall_bsd.go $syscall_goos"
+		;;
+	esac
+	if [ -n "$mksyscall" ]; then echo "$mksyscall $syscall_goos syscall_$GOOSARCH.go |gofmt >zsyscall_$GOOSARCH.go"; fi
 	if [ -n "$mksysnum" ]; then echo "$mksysnum |gofmt >zsysnum_$GOOSARCH.go"; fi
 	if [ -n "$mktypes" ]; then echo "$mktypes types_$GOOS.c |gofmt >ztypes_$GOOSARCH.go"; fi
 ) | $run

src/pkg/syscall/syscall_bsd.go

@@ -451,9 +451,27 @@ func SysctlUint32(name string) (value uint32, errno int) {
 	return *(*uint32)(unsafe.Pointer(&buf[0])), 0
 }
 
+//sys	utimes(path string, timeval *[2]Timeval) (errno int)
+func Utimes(path string, tv []Timeval) (errno int) {
+	if len(tv) != 2 {
+		return EINVAL
+	}
+	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+}
+
+//sys	futimes(fd int, timeval *[2]Timeval) (errno int)
+func Futimes(fd int, tv []Timeval) (errno int) {
+	if len(tv) != 2 {
+		return EINVAL
+	}
+	return futimes(fd, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+}
+
+//sys	fcntl(fd int, cmd int, arg int) (val int, errno int)
+
+
 // TODO: wrap
 //	Acct(name nil-string) (errno int)
-//	Futimes(fd int, timeval *Timeval) (errno int)	// Pointer to 2 timevals!
 //	Gethostuuid(uuid *byte, timeout *Timespec) (errno int)
 //	Getsockopt(s int, level int, name int, val *byte, vallen *int) (errno int)
 //	Madvise(addr *byte, len int, behav int) (errno int)
@@ -463,5 +481,3 @@ func SysctlUint32(name string) (value uint32, errno int) {
 //	Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, errno int)
 //	Recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)
 //	Sendmsg(s int, msg *Msghdr, flags int) (n int, errno int)
-//	Utimes(path string, timeval *Timeval) (errno int)	// Pointer to 2 timevals!
-//sys	fcntl(fd int, cmd int, arg int) (val int, errno int)

src/pkg/syscall/syscall_linux.go

@@ -49,12 +49,18 @@ func Utimes(path string, tv []Timeval) (errno int) {
 	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
 }
 
-//sys	futimesat(dirfd int, path string, times *[2]Timeval) (errno int)
+//sys	futimesat(dirfd int, path *byte, times *[2]Timeval) (errno int)
 func Futimesat(dirfd int, path string, tv []Timeval) (errno int) {
 	if len(tv) != 2 {
 		return EINVAL
 	}
-	return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+	return futimesat(dirfd, StringBytePtr(path), (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+}
+
+func Futimes(fd int, tv []Timeval) (errno int) {
+	// Believe it or not, this is the best we can do on Linux
+	// (and is what glibc does).
+	return Utimes("/proc/self/fd/"+str(fd), tv)
 }
 
 const ImplementsGetwd = true

src/pkg/syscall/zsyscall_darwin_386.go

@@ -121,6 +121,18 @@ func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr)
 	return
 }
 
+func utimes(path string, timeval *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_UTIMES, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(unsafe.Pointer(timeval)), 0)
+	errno = int(e1)
+	return
+}
+
+func futimes(fd int, timeval *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_FUTIMES, uintptr(fd), uintptr(unsafe.Pointer(timeval)), 0)
+	errno = int(e1)
+	return
+}
+
 func fcntl(fd int, cmd int, arg int) (val int, errno int) {
 	r0, _, e1 := Syscall(SYS_FCNTL, uintptr(fd), uintptr(cmd), uintptr(arg))
 	val = int(r0)

src/pkg/syscall/zsyscall_darwin_amd64.go

@@ -121,6 +121,18 @@ func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr)
 	return
 }
 
+func utimes(path string, timeval *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_UTIMES, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(unsafe.Pointer(timeval)), 0)
+	errno = int(e1)
+	return
+}
+
+func futimes(fd int, timeval *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_FUTIMES, uintptr(fd), uintptr(unsafe.Pointer(timeval)), 0)
+	errno = int(e1)
+	return
+}
+
 func fcntl(fd int, cmd int, arg int) (val int, errno int) {
 	r0, _, e1 := Syscall(SYS_FCNTL, uintptr(fd), uintptr(cmd), uintptr(arg))
 	val = int(r0)

src/pkg/syscall/zsyscall_linux_386.go

@@ -31,8 +31,8 @@ func utimes(path string, times *[2]Timeval) (errno int) {
 	return
 }
 
-func futimesat(dirfd int, path string, times *[2]Timeval) (errno int) {
-	_, _, e1 := Syscall(SYS_FUTIMESAT, uintptr(dirfd), uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(unsafe.Pointer(times)))
+func futimesat(dirfd int, path *byte, times *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_FUTIMESAT, uintptr(dirfd), uintptr(unsafe.Pointer(path)), uintptr(unsafe.Pointer(times)))
 	errno = int(e1)
 	return
 }

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -31,8 +31,8 @@ func utimes(path string, times *[2]Timeval) (errno int) {
 	return
 }
 
-func futimesat(dirfd int, path string, times *[2]Timeval) (errno int) {
-	_, _, e1 := Syscall(SYS_FUTIMESAT, uintptr(dirfd), uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(unsafe.Pointer(times)))
+func futimesat(dirfd int, path *byte, times *[2]Timeval) (errno int) {
+	_, _, e1 := Syscall(SYS_FUTIMESAT, uintptr(dirfd), uintptr(unsafe.Pointer(path)), uintptr(unsafe.Pointer(times)))
 	errno = int(e1)
 	return
 }