syscall: use 64-bit file size for truncation on Linux

Truncate and Ftruncate for 32-bit Linux should use 64-bit
offset system calls.

R=rsc
CC=golang-dev, royger
https://golang.org/cl/2943041

src/pkg/syscall/syscall_linux.go

@@ -623,7 +623,6 @@ func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0)
 //sys	fcntl(fd int, cmd int, arg int) (val int, errno int)
 //sys	Fdatasync(fd int) (errno int)
 //sys	Fsync(fd int) (errno int)
-//sys	Ftruncate(fd int, length int64) (errno int)
 //sys	Getdents(fd int, buf []byte) (n int, errno int) = SYS_GETDENTS64
 //sys	Getpgid(pid int) (pgid int, errno int)
 //sys	Getpgrp() (pid int)
@@ -665,7 +664,6 @@ func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0)
 //sys	Tee(rfd int, wfd int, len int, flags int) (n int64, errno int)
 //sys	Tgkill(tgid int, tid int, sig int) (errno int)
 //sys	Times(tms *Tms) (ticks uintptr, errno int)
-//sys	Truncate(path string, length int64) (errno int)
 //sys	Umask(mask int) (oldmask int)
 //sys	Uname(buf *Utsname) (errno int)
 //sys	Unlink(path string) (errno int)

src/pkg/syscall/syscall_linux_386.go

@@ -30,6 +30,7 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //sys	Chown(path string, uid int, gid int) (errno int) = SYS_CHOWN32
 //sys	Fchown(fd int, uid int, gid int) (errno int) = SYS_FCHOWN32
 //sys	Fstat(fd int, stat *Stat_t) (errno int) = SYS_FSTAT64
+//sys	Ftruncate(fd int, length int64) (errno int) = SYS_FTRUNCATE64
 //sys	Getegid() (egid int) = SYS_GETEGID32
 //sys	Geteuid() (euid int) = SYS_GETEUID32
 //sys	Getgid() (gid int) = SYS_GETGID32
@@ -49,6 +50,7 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //sys	Setreuid(ruid int, euid int) (errno int) = SYS_SETREUID32
 //sys	Stat(path string, stat *Stat_t) (errno int) = SYS_STAT64
 //sys	SyncFileRange(fd int, off int64, n int64, flags int) (errno int)
+//sys	Truncate(path string, length int64) (errno int) = SYS_TRUNCATE64
 //sys	getgroups(n int, list *_Gid_t) (nn int, errno int) = SYS_GETGROUPS32
 //sys	setgroups(n int, list *_Gid_t) (errno int) = SYS_SETGROUPS32
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int) = SYS__NEWSELECT

src/pkg/syscall/syscall_linux_amd64.go

@@ -8,6 +8,7 @@ package syscall
 //sys	Fchown(fd int, uid int, gid int) (errno int)
 //sys	Fstat(fd int, stat *Stat_t) (errno int)
 //sys	Fstatfs(fd int, buf *Statfs_t) (errno int)
+//sys	Ftruncate(fd int, length int64) (errno int)
 //sys	Getegid() (egid int)
 //sys	Geteuid() (euid int)
 //sys	Getgid() (gid int)
@@ -32,6 +33,7 @@ package syscall
 //sys	Stat(path string, stat *Stat_t) (errno int)
 //sys	Statfs(path string, buf *Statfs_t) (errno int)
 //sys	SyncFileRange(fd int, off int64, n int64, flags int) (errno int)
+//sys	Truncate(path string, length int64) (errno int)
 //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
 //sys	bind(s int, addr uintptr, addrlen _Socklen) (errno int)
 //sys	connect(s int, addr uintptr, addrlen _Socklen) (errno int)

src/pkg/syscall/syscall_linux_arm.go

@@ -69,6 +69,7 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 //sys	Fchown(fd int, uid int, gid int) (errno int)
 //sys	Fstat(fd int, stat *Stat_t) (errno int) = SYS_FSTAT64
 //sys	Fstatfs(fd int, buf *Statfs_t) (errno int) = SYS_FSTATFS64
+//sys	Ftruncate(fd int, length int64) (errno int) = SYS_FTRUNCATE64
 //sys	Getegid() (egid int)
 //sys	Geteuid() (euid int)
 //sys	Getgid() (gid int)
@@ -87,6 +88,7 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 //sys	Shutdown(fd int, how int) (errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int) = SYS_STAT64
 //sys	Statfs(path string, buf *Statfs_t) (errno int) = SYS_STATFS64
+//sys	Truncate(path string, length int64) (errno int) = SYS_TRUNCATE64
 
 // Vsyscalls on amd64.
 //sys	Gettimeofday(tv *Timeval) (errno int)

src/pkg/syscall/zsyscall_linux_386.go

@@ -273,14 +273,6 @@ func Fsync(fd int) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Ftruncate(fd int, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), uintptr(length>>32))
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getdents(fd int, buf []byte) (n int, errno int) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {
@@ -645,14 +637,6 @@ func Times(tms *Tms) (ticks uintptr, errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Truncate(path string, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_TRUNCATE, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), uintptr(length>>32))
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Umask(mask int) (oldmask int) {
 	r0, _, _ := Syscall(SYS_UMASK, uintptr(mask), 0, 0)
 	oldmask = int(r0)
@@ -772,6 +756,14 @@ func Fstat(fd int, stat *Stat_t) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Ftruncate(fd int, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_FTRUNCATE64, uintptr(fd), uintptr(length), uintptr(length>>32))
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getegid() (egid int) {
 	r0, _, _ := Syscall(SYS_GETEGID32, 0, 0, 0)
 	egid = int(r0)
@@ -934,6 +926,14 @@ func SyncFileRange(fd int, off int64, n int64, flags int) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Truncate(path string, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_TRUNCATE64, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), uintptr(length>>32))
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func getgroups(n int, list *_Gid_t) (nn int, errno int) {
 	r0, _, e1 := Syscall(SYS_GETGROUPS32, uintptr(n), uintptr(unsafe.Pointer(list)), 0)
 	nn = int(r0)

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -273,14 +273,6 @@ func Fsync(fd int) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Ftruncate(fd int, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0)
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getdents(fd int, buf []byte) (n int, errno int) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {
@@ -645,14 +637,6 @@ func Times(tms *Tms) (ticks uintptr, errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Truncate(path string, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_TRUNCATE, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), 0)
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Umask(mask int) (oldmask int) {
 	r0, _, _ := Syscall(SYS_UMASK, uintptr(mask), 0, 0)
 	oldmask = int(r0)
@@ -780,6 +764,14 @@ func Fstatfs(fd int, buf *Statfs_t) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Ftruncate(fd int, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0)
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getegid() (egid int) {
 	r0, _, _ := Syscall(SYS_GETEGID, 0, 0, 0)
 	egid = int(r0)
@@ -984,6 +976,14 @@ func SyncFileRange(fd int, off int64, n int64, flags int) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Truncate(path string, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_TRUNCATE, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), 0)
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int) {
 	r0, _, e1 := Syscall(SYS_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	fd = int(r0)

src/pkg/syscall/zsyscall_linux_arm.go

@@ -273,14 +273,6 @@ func Fsync(fd int) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Ftruncate(fd int, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), uintptr(length>>32))
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getdents(fd int, buf []byte) (n int, errno int) {
 	var _p0 unsafe.Pointer
 	if len(buf) > 0 {
@@ -645,14 +637,6 @@ func Times(tms *Tms) (ticks uintptr, errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Truncate(path string, length int64) (errno int) {
-	_, _, e1 := Syscall(SYS_TRUNCATE, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), uintptr(length>>32))
-	errno = int(e1)
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Umask(mask int) (oldmask int) {
 	r0, _, _ := Syscall(SYS_UMASK, uintptr(mask), 0, 0)
 	oldmask = int(r0)
@@ -888,6 +872,14 @@ func Fstatfs(fd int, buf *Statfs_t) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Ftruncate(fd int, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_FTRUNCATE64, uintptr(fd), uintptr(length), uintptr(length>>32))
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Getegid() (egid int) {
 	r0, _, _ := Syscall(SYS_GETEGID, 0, 0, 0)
 	egid = int(r0)
@@ -1033,6 +1025,14 @@ func Statfs(path string, buf *Statfs_t) (errno int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Truncate(path string, length int64) (errno int) {
+	_, _, e1 := Syscall(SYS_TRUNCATE64, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(length), uintptr(length>>32))
+	errno = int(e1)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettimeofday(tv *Timeval) (errno int) {
 	_, _, e1 := Syscall(SYS_GETTIMEOFDAY, uintptr(unsafe.Pointer(tv)), 0, 0)
 	errno = int(e1)