unix: don't allocate putting common errno values in error interfaces

From main repo: https://go-review.googlesource.com/#/c/6701/3

Fixes golang/go#10266

Change-Id: I141fefe7f317edcea19b588b1569fa8772237f56
Reviewed-on: https://go-review.googlesource.com/8190
Reviewed-by: Rob Pike <r@golang.org>

unix/zsyscall_freebsd_amd64.go

@@ -16,7 +16,7 @@ func getgroups(ngid int, gid *_Gid_t) (n int, err error) {
 	r0, _, e1 := RawSyscall(SYS_GETGROUPS, uintptr(ngid), uintptr(unsafe.Pointer(gid)), 0)
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -26,7 +26,7 @@ func getgroups(ngid int, gid *_Gid_t) (n int, err error) {
 func setgroups(ngid int, gid *_Gid_t) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETGROUPS, uintptr(ngid), uintptr(unsafe.Pointer(gid)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -37,7 +37,7 @@ func wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err
 	r0, _, e1 := Syscall6(SYS_WAIT4, uintptr(pid), uintptr(unsafe.Pointer(wstatus)), uintptr(options), uintptr(unsafe.Pointer(rusage)), 0, 0)
 	wpid = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -48,7 +48,7 @@ func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) {
 	r0, _, e1 := Syscall(SYS_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	fd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -58,7 +58,7 @@ func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) {
 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
 	_, _, e1 := Syscall(SYS_BIND, uintptr(s), uintptr(addr), uintptr(addrlen))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -68,7 +68,7 @@ func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
 	_, _, e1 := Syscall(SYS_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -79,7 +79,7 @@ func socket(domain int, typ int, proto int) (fd int, err error) {
 	r0, _, e1 := RawSyscall(SYS_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto))
 	fd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -89,7 +89,7 @@ func socket(domain int, typ int, proto int) (fd int, err error) {
 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) {
 	_, _, e1 := Syscall6(SYS_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -99,7 +99,7 @@ func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen
 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {
 	_, _, e1 := Syscall6(SYS_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(vallen), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -109,7 +109,7 @@ func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr)
 func getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 	_, _, e1 := RawSyscall(SYS_GETPEERNAME, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -119,7 +119,7 @@ func getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 func getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 	_, _, e1 := RawSyscall(SYS_GETSOCKNAME, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -129,7 +129,7 @@ func getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 func Shutdown(s int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(s), uintptr(how), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -139,7 +139,7 @@ func Shutdown(s int, how int) (err error) {
 func socketpair(domain int, typ int, proto int, fd *[2]int32) (err error) {
 	_, _, e1 := RawSyscall6(SYS_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(proto), uintptr(unsafe.Pointer(fd)), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -156,7 +156,7 @@ func recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Sockl
 	r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -172,7 +172,7 @@ func sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (
 	}
 	_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(_p0), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -183,7 +183,7 @@ func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -194,7 +194,7 @@ func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -205,7 +205,7 @@ func kevent(kq int, change unsafe.Pointer, nchange int, event unsafe.Pointer, ne
 	r0, _, e1 := Syscall6(SYS_KEVENT, uintptr(kq), uintptr(change), uintptr(nchange), uintptr(event), uintptr(nevent), uintptr(unsafe.Pointer(timeout)))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -221,7 +221,7 @@ func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr)
 	}
 	_, _, e1 := Syscall6(SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -237,7 +237,7 @@ func utimes(path string, timeval *[2]Timeval) (err error) {
 	_, _, e1 := Syscall(SYS_UTIMES, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(timeval)), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -247,7 +247,7 @@ func utimes(path string, timeval *[2]Timeval) (err error) {
 func futimes(fd int, timeval *[2]Timeval) (err error) {
 	_, _, e1 := Syscall(SYS_FUTIMES, uintptr(fd), uintptr(unsafe.Pointer(timeval)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -258,7 +258,7 @@ func fcntl(fd int, cmd int, arg int) (val int, err error) {
 	r0, _, e1 := Syscall(SYS_FCNTL, uintptr(fd), uintptr(cmd), uintptr(arg))
 	val = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -270,7 +270,7 @@ func pipe() (r int, w int, err error) {
 	r = int(r0)
 	w = int(r1)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -286,7 +286,7 @@ func Access(path string, mode uint32) (err error) {
 	_, _, e1 := Syscall(SYS_ACCESS, uintptr(unsafe.Pointer(_p0)), uintptr(mode), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -296,7 +296,7 @@ func Access(path string, mode uint32) (err error) {
 func Adjtime(delta *Timeval, olddelta *Timeval) (err error) {
 	_, _, e1 := Syscall(SYS_ADJTIME, uintptr(unsafe.Pointer(delta)), uintptr(unsafe.Pointer(olddelta)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -312,7 +312,7 @@ func Chdir(path string) (err error) {
 	_, _, e1 := Syscall(SYS_CHDIR, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -328,7 +328,7 @@ func Chflags(path string, flags int) (err error) {
 	_, _, e1 := Syscall(SYS_CHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -344,7 +344,7 @@ func Chmod(path string, mode uint32) (err error) {
 	_, _, e1 := Syscall(SYS_CHMOD, uintptr(unsafe.Pointer(_p0)), uintptr(mode), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -360,7 +360,7 @@ func Chown(path string, uid int, gid int) (err error) {
 	_, _, e1 := Syscall(SYS_CHOWN, uintptr(unsafe.Pointer(_p0)), uintptr(uid), uintptr(gid))
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -376,7 +376,7 @@ func Chroot(path string) (err error) {
 	_, _, e1 := Syscall(SYS_CHROOT, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -386,7 +386,7 @@ func Chroot(path string) (err error) {
 func Close(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_CLOSE, uintptr(fd), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -397,7 +397,7 @@ func Dup(fd int) (nfd int, err error) {
 	r0, _, e1 := Syscall(SYS_DUP, uintptr(fd), 0, 0)
 	nfd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -407,7 +407,7 @@ func Dup(fd int) (nfd int, err error) {
 func Dup2(from int, to int) (err error) {
 	_, _, e1 := Syscall(SYS_DUP2, uintptr(from), uintptr(to), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -431,7 +431,7 @@ func ExtattrGetFd(fd int, attrnamespace int, attrname string, data uintptr, nbyt
 	use(unsafe.Pointer(_p0))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -448,7 +448,7 @@ func ExtattrSetFd(fd int, attrnamespace int, attrname string, data uintptr, nbyt
 	use(unsafe.Pointer(_p0))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -464,7 +464,7 @@ func ExtattrDeleteFd(fd int, attrnamespace int, attrname string) (err error) {
 	_, _, e1 := Syscall(SYS_EXTATTR_DELETE_FD, uintptr(fd), uintptr(attrnamespace), uintptr(unsafe.Pointer(_p0)))
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -475,7 +475,7 @@ func ExtattrListFd(fd int, attrnamespace int, data uintptr, nbytes int) (ret int
 	r0, _, e1 := Syscall6(SYS_EXTATTR_LIST_FD, uintptr(fd), uintptr(attrnamespace), uintptr(data), uintptr(nbytes), 0, 0)
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -498,7 +498,7 @@ func ExtattrGetFile(file string, attrnamespace int, attrname string, data uintpt
 	use(unsafe.Pointer(_p1))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -521,7 +521,7 @@ func ExtattrSetFile(file string, attrnamespace int, attrname string, data uintpt
 	use(unsafe.Pointer(_p1))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -543,7 +543,7 @@ func ExtattrDeleteFile(file string, attrnamespace int, attrname string) (err err
 	use(unsafe.Pointer(_p0))
 	use(unsafe.Pointer(_p1))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -560,7 +560,7 @@ func ExtattrListFile(file string, attrnamespace int, data uintptr, nbytes int) (
 	use(unsafe.Pointer(_p0))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -583,7 +583,7 @@ func ExtattrGetLink(link string, attrnamespace int, attrname string, data uintpt
 	use(unsafe.Pointer(_p1))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -606,7 +606,7 @@ func ExtattrSetLink(link string, attrnamespace int, attrname string, data uintpt
 	use(unsafe.Pointer(_p1))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -628,7 +628,7 @@ func ExtattrDeleteLink(link string, attrnamespace int, attrname string) (err err
 	use(unsafe.Pointer(_p0))
 	use(unsafe.Pointer(_p1))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -645,7 +645,7 @@ func ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (
 	use(unsafe.Pointer(_p0))
 	ret = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -655,7 +655,7 @@ func ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (
 func Fchdir(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHDIR, uintptr(fd), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -665,7 +665,7 @@ func Fchdir(fd int) (err error) {
 func Fchflags(fd int, flags int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -675,7 +675,7 @@ func Fchflags(fd int, flags int) (err error) {
 func Fchmod(fd int, mode uint32) (err error) {
 	_, _, e1 := Syscall(SYS_FCHMOD, uintptr(fd), uintptr(mode), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -685,7 +685,7 @@ func Fchmod(fd int, mode uint32) (err error) {
 func Fchown(fd int, uid int, gid int) (err error) {
 	_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -695,7 +695,7 @@ func Fchown(fd int, uid int, gid int) (err error) {
 func Flock(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_FLOCK, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -706,7 +706,7 @@ func Fpathconf(fd int, name int) (val int, err error) {
 	r0, _, e1 := Syscall(SYS_FPATHCONF, uintptr(fd), uintptr(name), 0)
 	val = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -716,7 +716,7 @@ func Fpathconf(fd int, name int) (val int, err error) {
 func Fstat(fd int, stat *Stat_t) (err error) {
 	_, _, e1 := Syscall(SYS_FSTAT, uintptr(fd), uintptr(unsafe.Pointer(stat)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -726,7 +726,7 @@ func Fstat(fd int, stat *Stat_t) (err error) {
 func Fstatfs(fd int, stat *Statfs_t) (err error) {
 	_, _, e1 := Syscall(SYS_FSTATFS, uintptr(fd), uintptr(unsafe.Pointer(stat)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -736,7 +736,7 @@ func Fstatfs(fd int, stat *Statfs_t) (err error) {
 func Fsync(fd int) (err error) {
 	_, _, e1 := Syscall(SYS_FSYNC, uintptr(fd), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -746,7 +746,7 @@ func Fsync(fd int) (err error) {
 func Ftruncate(fd int, length int64) (err error) {
 	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -763,7 +763,7 @@ func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
 	r0, _, e1 := Syscall6(SYS_GETDIRENTRIES, uintptr(fd), uintptr(_p0), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -806,7 +806,7 @@ func Getpgid(pid int) (pgid int, err error) {
 	r0, _, e1 := RawSyscall(SYS_GETPGID, uintptr(pid), 0, 0)
 	pgid = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -841,7 +841,7 @@ func Getpriority(which int, who int) (prio int, err error) {
 	r0, _, e1 := Syscall(SYS_GETPRIORITY, uintptr(which), uintptr(who), 0)
 	prio = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -851,7 +851,7 @@ func Getpriority(which int, who int) (prio int, err error) {
 func Getrlimit(which int, lim *Rlimit) (err error) {
 	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(which), uintptr(unsafe.Pointer(lim)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -861,7 +861,7 @@ func Getrlimit(which int, lim *Rlimit) (err error) {
 func Getrusage(who int, rusage *Rusage) (err error) {
 	_, _, e1 := RawSyscall(SYS_GETRUSAGE, uintptr(who), uintptr(unsafe.Pointer(rusage)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -872,7 +872,7 @@ func Getsid(pid int) (sid int, err error) {
 	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
 	sid = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -882,7 +882,7 @@ func Getsid(pid int) (sid int, err error) {
 func Gettimeofday(tv *Timeval) (err error) {
 	_, _, e1 := RawSyscall(SYS_GETTIMEOFDAY, uintptr(unsafe.Pointer(tv)), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -908,7 +908,7 @@ func Issetugid() (tainted bool) {
 func Kill(pid int, signum syscall.Signal) (err error) {
 	_, _, e1 := Syscall(SYS_KILL, uintptr(pid), uintptr(signum), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -919,7 +919,7 @@ func Kqueue() (fd int, err error) {
 	r0, _, e1 := Syscall(SYS_KQUEUE, 0, 0, 0)
 	fd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -935,7 +935,7 @@ func Lchown(path string, uid int, gid int) (err error) {
 	_, _, e1 := Syscall(SYS_LCHOWN, uintptr(unsafe.Pointer(_p0)), uintptr(uid), uintptr(gid))
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -957,7 +957,7 @@ func Link(path string, link string) (err error) {
 	use(unsafe.Pointer(_p0))
 	use(unsafe.Pointer(_p1))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -967,7 +967,7 @@ func Link(path string, link string) (err error) {
 func Listen(s int, backlog int) (err error) {
 	_, _, e1 := Syscall(SYS_LISTEN, uintptr(s), uintptr(backlog), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -983,7 +983,7 @@ func Lstat(path string, stat *Stat_t) (err error) {
 	_, _, e1 := Syscall(SYS_LSTAT, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -999,7 +999,7 @@ func Mkdir(path string, mode uint32) (err error) {
 	_, _, e1 := Syscall(SYS_MKDIR, uintptr(unsafe.Pointer(_p0)), uintptr(mode), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1015,7 +1015,7 @@ func Mkfifo(path string, mode uint32) (err error) {
 	_, _, e1 := Syscall(SYS_MKFIFO, uintptr(unsafe.Pointer(_p0)), uintptr(mode), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1031,7 +1031,7 @@ func Mknod(path string, mode uint32, dev int) (err error) {
 	_, _, e1 := Syscall(SYS_MKNOD, uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(dev))
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1047,7 +1047,7 @@ func Mlock(b []byte) (err error) {
 	}
 	_, _, e1 := Syscall(SYS_MLOCK, uintptr(_p0), uintptr(len(b)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1057,7 +1057,7 @@ func Mlock(b []byte) (err error) {
 func Mlockall(flags int) (err error) {
 	_, _, e1 := Syscall(SYS_MLOCKALL, uintptr(flags), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1073,7 +1073,7 @@ func Mprotect(b []byte, prot int) (err error) {
 	}
 	_, _, e1 := Syscall(SYS_MPROTECT, uintptr(_p0), uintptr(len(b)), uintptr(prot))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1089,7 +1089,7 @@ func Munlock(b []byte) (err error) {
 	}
 	_, _, e1 := Syscall(SYS_MUNLOCK, uintptr(_p0), uintptr(len(b)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1099,7 +1099,7 @@ func Munlock(b []byte) (err error) {
 func Munlockall() (err error) {
 	_, _, e1 := Syscall(SYS_MUNLOCKALL, 0, 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1109,7 +1109,7 @@ func Munlockall() (err error) {
 func Nanosleep(time *Timespec, leftover *Timespec) (err error) {
 	_, _, e1 := Syscall(SYS_NANOSLEEP, uintptr(unsafe.Pointer(time)), uintptr(unsafe.Pointer(leftover)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1126,7 +1126,7 @@ func Open(path string, mode int, perm uint32) (fd int, err error) {
 	use(unsafe.Pointer(_p0))
 	fd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1143,7 +1143,7 @@ func Pathconf(path string, name int) (val int, err error) {
 	use(unsafe.Pointer(_p0))
 	val = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1160,7 +1160,7 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 	r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1177,7 +1177,7 @@ func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), 0, 0)
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1194,7 +1194,7 @@ func read(fd int, p []byte) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(_p0), uintptr(len(p)))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1217,7 +1217,7 @@ func Readlink(path string, buf []byte) (n int, err error) {
 	use(unsafe.Pointer(_p0))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1239,7 +1239,7 @@ func Rename(from string, to string) (err error) {
 	use(unsafe.Pointer(_p0))
 	use(unsafe.Pointer(_p1))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1255,7 +1255,7 @@ func Revoke(path string) (err error) {
 	_, _, e1 := Syscall(SYS_REVOKE, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1271,7 +1271,7 @@ func Rmdir(path string) (err error) {
 	_, _, e1 := Syscall(SYS_RMDIR, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1282,7 +1282,7 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
 	r0, _, e1 := Syscall(SYS_LSEEK, uintptr(fd), uintptr(offset), uintptr(whence))
 	newoffset = int64(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1292,7 +1292,7 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
 func Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) {
 	_, _, e1 := Syscall6(SYS_SELECT, uintptr(n), uintptr(unsafe.Pointer(r)), uintptr(unsafe.Pointer(w)), uintptr(unsafe.Pointer(e)), uintptr(unsafe.Pointer(timeout)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1302,7 +1302,7 @@ func Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) {
 func Setegid(egid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETEGID, uintptr(egid), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1312,7 +1312,7 @@ func Setegid(egid int) (err error) {
 func Seteuid(euid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETEUID, uintptr(euid), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1322,7 +1322,7 @@ func Seteuid(euid int) (err error) {
 func Setgid(gid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETGID, uintptr(gid), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1338,7 +1338,7 @@ func Setlogin(name string) (err error) {
 	_, _, e1 := Syscall(SYS_SETLOGIN, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1348,7 +1348,7 @@ func Setlogin(name string) (err error) {
 func Setpgid(pid int, pgid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETPGID, uintptr(pid), uintptr(pgid), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1358,7 +1358,7 @@ func Setpgid(pid int, pgid int) (err error) {
 func Setpriority(which int, who int, prio int) (err error) {
 	_, _, e1 := Syscall(SYS_SETPRIORITY, uintptr(which), uintptr(who), uintptr(prio))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1368,7 +1368,7 @@ func Setpriority(which int, who int, prio int) (err error) {
 func Setregid(rgid int, egid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETREGID, uintptr(rgid), uintptr(egid), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1378,7 +1378,7 @@ func Setregid(rgid int, egid int) (err error) {
 func Setreuid(ruid int, euid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETREUID, uintptr(ruid), uintptr(euid), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1388,7 +1388,7 @@ func Setreuid(ruid int, euid int) (err error) {
 func Setresgid(rgid int, egid int, sgid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETRESGID, uintptr(rgid), uintptr(egid), uintptr(sgid))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1398,7 +1398,7 @@ func Setresgid(rgid int, egid int, sgid int) (err error) {
 func Setresuid(ruid int, euid int, suid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETRESUID, uintptr(ruid), uintptr(euid), uintptr(suid))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1408,7 +1408,7 @@ func Setresuid(ruid int, euid int, suid int) (err error) {
 func Setrlimit(which int, lim *Rlimit) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(which), uintptr(unsafe.Pointer(lim)), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1419,7 +1419,7 @@ func Setsid() (pid int, err error) {
 	r0, _, e1 := RawSyscall(SYS_SETSID, 0, 0, 0)
 	pid = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1429,7 +1429,7 @@ func Setsid() (pid int, err error) {
 func Settimeofday(tp *Timeval) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETTIMEOFDAY, uintptr(unsafe.Pointer(tp)), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1439,7 +1439,7 @@ func Settimeofday(tp *Timeval) (err error) {
 func Setuid(uid int) (err error) {
 	_, _, e1 := RawSyscall(SYS_SETUID, uintptr(uid), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1455,7 +1455,7 @@ func Stat(path string, stat *Stat_t) (err error) {
 	_, _, e1 := Syscall(SYS_STAT, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1471,7 +1471,7 @@ func Statfs(path string, stat *Statfs_t) (err error) {
 	_, _, e1 := Syscall(SYS_STATFS, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1493,7 +1493,7 @@ func Symlink(path string, link string) (err error) {
 	use(unsafe.Pointer(_p0))
 	use(unsafe.Pointer(_p1))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1503,7 +1503,7 @@ func Symlink(path string, link string) (err error) {
 func Sync() (err error) {
 	_, _, e1 := Syscall(SYS_SYNC, 0, 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1519,7 +1519,7 @@ func Truncate(path string, length int64) (err error) {
 	_, _, e1 := Syscall(SYS_TRUNCATE, uintptr(unsafe.Pointer(_p0)), uintptr(length), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1543,7 +1543,7 @@ func Undelete(path string) (err error) {
 	_, _, e1 := Syscall(SYS_UNDELETE, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1559,7 +1559,7 @@ func Unlink(path string) (err error) {
 	_, _, e1 := Syscall(SYS_UNLINK, uintptr(unsafe.Pointer(_p0)), 0, 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1575,7 +1575,7 @@ func Unmount(path string, flags int) (err error) {
 	_, _, e1 := Syscall(SYS_UNMOUNT, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
 	use(unsafe.Pointer(_p0))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1592,7 +1592,7 @@ func write(fd int, p []byte) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1603,7 +1603,7 @@ func mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (
 	r0, _, e1 := Syscall6(SYS_MMAP, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flag), uintptr(fd), uintptr(pos))
 	ret = uintptr(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1613,7 +1613,7 @@ func mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (
 func munmap(addr uintptr, length uintptr) (err error) {
 	_, _, e1 := Syscall(SYS_MUNMAP, uintptr(addr), uintptr(length), 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1624,7 +1624,7 @@ func readlen(fd int, buf *byte, nbuf int) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_READ, uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1635,7 +1635,7 @@ func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
 	r0, _, e1 := Syscall(SYS_WRITE, uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
 	n = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1646,7 +1646,7 @@ func accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int
 	r0, _, e1 := Syscall6(SYS_ACCEPT4, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
 	nfd = int(r0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }