syscall: fix 32-bit uid calls

        16-bit uid calls are not always supported in newer kernels.

R=dave, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/6279047

src/pkg/syscall/syscall_linux_arm.go

@@ -41,26 +41,28 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error)
 //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
 //sys	sendmsg(s int, msg *Msghdr, flags int) (err error)
 
-//sys	Chown(path string, uid int, gid int) (err error)
-//sys	Fchown(fd int, uid int, gid int) (err error)
+// 64-bit file system and 32-bit uid calls
+// (16-bit uid calls are not always supported in newer kernels)
+//sys	Chown(path string, uid int, gid int) (err error) = SYS_CHOWN32
+//sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
 //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
 //sys	Fstatfs(fd int, buf *Statfs_t) (err error) = SYS_FSTATFS64
-//sysnb	Getegid() (egid int)
-//sysnb	Geteuid() (euid int)
-//sysnb	Getgid() (gid int)
-//sysnb	Getuid() (uid int)
-//sys	Lchown(path string, uid int, gid int) (err error)
+//sysnb	Getegid() (egid int) = SYS_GETEGID32
+//sysnb	Geteuid() (euid int) = SYS_GETEUID32
+//sysnb	Getgid() (gid int) = SYS_GETGID32
+//sysnb	Getuid() (uid int) = SYS_GETUID32
+//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	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
-//sysnb	Setgid(gid int) (err error)
-//sysnb	Setregid(rgid int, egid int) (err error)
-//sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
-//sysnb	Setresuid(ruid int, euid int, suid int) (err error)
-//sysnb	Setreuid(ruid int, euid int) (err error)
+//sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
+//sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
+//sysnb	Setgid(gid int) (err error) = SYS_SETGID32
+//sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
+//sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
+//sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
+//sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
 //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64

src/pkg/syscall/zsyscall_linux_arm.go

@@ -1203,7 +1203,7 @@ func sendmsg(s int, msg *Msghdr, flags int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Chown(path string, uid int, gid int) (err error) {
-	_, _, e1 := Syscall(SYS_CHOWN, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(uid), uintptr(gid))
+	_, _, e1 := Syscall(SYS_CHOWN32, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
 		err = e1
 	}
@@ -1213,7 +1213,7 @@ func Chown(path string, uid int, gid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Fchown(fd int, uid int, gid int) (err error) {
-	_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
+	_, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
 		err = e1
 	}
@@ -1243,7 +1243,7 @@ func Fstatfs(fd int, buf *Statfs_t) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Getegid() (egid int) {
-	r0, _, _ := RawSyscall(SYS_GETEGID, 0, 0, 0)
+	r0, _, _ := RawSyscall(SYS_GETEGID32, 0, 0, 0)
 	egid = int(r0)
 	return
 }
@@ -1251,7 +1251,7 @@ func Getegid() (egid int) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Geteuid() (euid int) {
-	r0, _, _ := RawSyscall(SYS_GETEUID, 0, 0, 0)
+	r0, _, _ := RawSyscall(SYS_GETEUID32, 0, 0, 0)
 	euid = int(r0)
 	return
 }
@@ -1259,7 +1259,7 @@ func Geteuid() (euid int) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Getgid() (gid int) {
-	r0, _, _ := RawSyscall(SYS_GETGID, 0, 0, 0)
+	r0, _, _ := RawSyscall(SYS_GETGID32, 0, 0, 0)
 	gid = int(r0)
 	return
 }
@@ -1267,7 +1267,7 @@ func Getgid() (gid int) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Getuid() (uid int) {
-	r0, _, _ := RawSyscall(SYS_GETUID, 0, 0, 0)
+	r0, _, _ := RawSyscall(SYS_GETUID32, 0, 0, 0)
 	uid = int(r0)
 	return
 }
@@ -1275,7 +1275,7 @@ func Getuid() (uid int) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Lchown(path string, uid int, gid int) (err error) {
-	_, _, e1 := Syscall(SYS_LCHOWN, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(uid), uintptr(gid))
+	_, _, e1 := Syscall(SYS_LCHOWN32, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
 		err = e1
 	}
@@ -1327,7 +1327,7 @@ 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 Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	_, _, e1 := Syscall(SYS_SETFSGID32, uintptr(gid), 0, 0)
 	if e1 != 0 {
 		err = e1
 	}
@@ -1337,7 +1337,7 @@ func Setfsgid(gid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	_, _, e1 := Syscall(SYS_SETFSUID32, uintptr(uid), 0, 0)
 	if e1 != 0 {
 		err = e1
 	}
@@ -1347,7 +1347,7 @@ func Setfsuid(uid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setgid(gid int) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETGID, uintptr(gid), 0, 0)
+	_, _, e1 := RawSyscall(SYS_SETGID32, uintptr(gid), 0, 0)
 	if e1 != 0 {
 		err = e1
 	}
@@ -1357,7 +1357,7 @@ func Setgid(gid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setregid(rgid int, egid int) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETREGID, uintptr(rgid), uintptr(egid), 0)
+	_, _, e1 := RawSyscall(SYS_SETREGID32, uintptr(rgid), uintptr(egid), 0)
 	if e1 != 0 {
 		err = e1
 	}
@@ -1367,7 +1367,7 @@ func Setregid(rgid int, egid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setresgid(rgid int, egid int, sgid int) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRESGID, uintptr(rgid), uintptr(egid), uintptr(sgid))
+	_, _, e1 := RawSyscall(SYS_SETRESGID32, uintptr(rgid), uintptr(egid), uintptr(sgid))
 	if e1 != 0 {
 		err = e1
 	}
@@ -1377,7 +1377,7 @@ func Setresgid(rgid int, egid int, sgid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setresuid(ruid int, euid int, suid int) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRESUID, uintptr(ruid), uintptr(euid), uintptr(suid))
+	_, _, e1 := RawSyscall(SYS_SETRESUID32, uintptr(ruid), uintptr(euid), uintptr(suid))
 	if e1 != 0 {
 		err = e1
 	}
@@ -1387,7 +1387,7 @@ func Setresuid(ruid int, euid int, suid int) (err error) {
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
 func Setreuid(ruid int, euid int) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETREUID, uintptr(ruid), uintptr(euid), 0)
+	_, _, e1 := RawSyscall(SYS_SETREUID32, uintptr(ruid), uintptr(euid), 0)
 	if e1 != 0 {
 		err = e1
 	}