syscall: Permit non-blocking syscalls.

Permit system calls to be designated as non-blocking, meaning
that we simply call them without involving the scheduler.

This change by itself is mostly performance neutral.  In
combination with a following change to the net package there
is a performance advantage.

R=rsc, dfc, r2, iant2, rsc1
CC=golang-dev
https://golang.org/cl/4278055

src/pkg/syscall/asm_darwin_386.s

@@ -81,3 +81,27 @@ ok1:
 	MOVL	DX, 24(SP)	// r2
 	MOVL	$0, 28(SP)	// errno
 	RET
+
+TEXT	·RawSyscall6(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$0x80
+	JAE	ok2
+	MOVL	$-1, 32(SP)	// r1
+	MOVL	$-1, 36(SP)	// r2
+	MOVL	AX, 40(SP)		// errno
+	RET
+ok2:
+	MOVL	AX, 32(SP)	// r1
+	MOVL	DX, 36(SP)	// r2
+	MOVL	$0, 40(SP)	// errno
+	RET

src/pkg/syscall/asm_darwin_amd64.s

@@ -78,3 +78,24 @@ ok1:
 	MOVQ	DX, 48(SP)	// r2
 	MOVQ	$0, 56(SP)	// errno
 	RET
+
+TEXT	·RawSyscall6(SB),7,$0
+	MOVQ	16(SP), DI
+	MOVQ	24(SP), SI
+	MOVQ	32(SP), DX
+	MOVQ	40(SP), R10
+	MOVQ	48(SP), R8
+	MOVQ	56(SP), R9
+	MOVQ	8(SP), AX	// syscall entry
+	ADDQ	$0x2000000, AX
+	SYSCALL
+	JCC	ok2
+	MOVQ	$-1, 64(SP)	// r1
+	MOVQ	$0, 72(SP)	// r2
+	MOVQ	AX, 80(SP)  // errno
+	RET
+ok2:
+	MOVQ	AX, 64(SP)	// r1
+	MOVQ	DX, 72(SP)	// r2
+	MOVQ	$0, 80(SP)	// errno
+	RET

src/pkg/syscall/asm_freebsd_386.s

@@ -81,3 +81,27 @@ ok1:
 	MOVL	DX, 24(SP)	// r2
 	MOVL	$0, 28(SP)	// errno
 	RET
+
+TEXT	·RawSyscall6(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$0x80
+	JAE	ok2
+	MOVL	$-1, 32(SP)	// r1
+	MOVL	$-1, 36(SP)	// r2
+	MOVL	AX, 40(SP)		// errno
+	RET
+ok2:
+	MOVL	AX, 32(SP)	// r1
+	MOVL	DX, 36(SP)	// r2
+	MOVL	$0, 40(SP)	// errno
+	RET

src/pkg/syscall/asm_freebsd_amd64.s

@@ -75,3 +75,23 @@ ok1:
 	MOVQ	DX, 48(SP)	// r2
 	MOVQ	$0, 56(SP)	// errno
 	RET
+
+TEXT	·RawSyscall6(SB),7,$0
+	MOVQ	16(SP), DI
+	MOVQ	24(SP), SI
+	MOVQ	32(SP), DX
+	MOVQ	40(SP), R10
+	MOVQ	48(SP), R8
+	MOVQ	56(SP), R9
+	MOVQ	8(SP), AX	// syscall entry
+	SYSCALL
+	JCC	ok2
+	MOVQ	$-1, 64(SP)	// r1
+	MOVQ	$0, 72(SP)	// r2
+	MOVQ	AX, 80(SP)  // errno
+	RET
+ok2:
+	MOVQ	AX, 64(SP)	// r1
+	MOVQ	DX, 72(SP)	// r2
+	MOVQ	$0, 80(SP)	// errno
+	RET

src/pkg/syscall/asm_linux_386.s

@@ -82,6 +82,30 @@ ok1:
 	MOVL	$0, 28(SP)	// errno
 	RET
 
+// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
+// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
+TEXT	·RawSyscall6(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	MOVL	8(SP), BX
+	MOVL	12(SP), CX
+	MOVL	16(SP), DX
+	MOVL	20(SP), SI
+	MOVL	24(SP), DI
+	// 28(SP) is ignored
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	ok2
+	MOVL	$-1, 32(SP)	// r1
+	MOVL	$0, 36(SP)	// r2
+	NEGL	AX
+	MOVL	AX, 40(SP)  // errno
+	RET
+ok2:
+	MOVL	AX, 32(SP)	// r1
+	MOVL	DX, 36(SP)	// r2
+	MOVL	$0, 40(SP)	// errno
+	RET
+
 #define SYS_SOCKETCALL 102	/* from zsysnum_linux_386.go */
 
 // func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
@@ -108,6 +132,27 @@ oksock:
 	CALL	runtime·exitsyscall(SB)
 	RET
 
+// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
+// Kernel interface gets call sub-number and pointer to a0.
+TEXT ·rawsocketcall(SB),7,$0
+	MOVL	$SYS_SOCKETCALL, AX	// syscall entry
+	MOVL	4(SP), BX	// socket call number
+	LEAL		8(SP), CX	// pointer to call arguments
+	MOVL	$0, DX
+	MOVL	$0, SI
+	MOVL	$0,  DI
+	INT	$0x80
+	CMPL	AX, $0xfffff001
+	JLS	oksock1
+	MOVL	$-1, 32(SP)	// n
+	NEGL	AX
+	MOVL	AX, 36(SP)  // errno
+	RET
+oksock1:
+	MOVL	AX, 32(SP)	// n
+	MOVL	$0, 36(SP)	// errno
+	RET
+
 #define SYS__LLSEEK 140	/* from zsysnum_linux_386.go */
 // func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 // Implemented in assembly to avoid allocation when

src/pkg/syscall/asm_linux_amd64.s

@@ -83,6 +83,28 @@ ok1:
 	MOVQ	$0, 56(SP)	// errno
 	RET
 
+TEXT ·RawSyscall6(SB),7,$0
+	MOVQ	16(SP), DI
+	MOVQ	24(SP), SI
+	MOVQ	32(SP), DX
+	MOVQ	40(SP), R10
+	MOVQ	48(SP), R8
+	MOVQ	56(SP), R9
+	MOVQ	8(SP), AX	// syscall entry
+	SYSCALL
+	CMPQ	AX, $0xfffffffffffff001
+	JLS	ok2
+	MOVQ	$-1, 64(SP)	// r1
+	MOVQ	$0, 72(SP)	// r2
+	NEGQ	AX
+	MOVQ	AX, 80(SP)  // errno
+	RET
+ok2:
+	MOVQ	AX, 64(SP)	// r1
+	MOVQ	DX, 72(SP)	// r2
+	MOVQ	$0, 80(SP)	// errno
+	RET
+
 TEXT ·Gettimeofday(SB),7,$0
 	MOVQ	8(SP), DI
 	MOVQ	$0, SI

src/pkg/syscall/asm_linux_arm.s

@@ -67,6 +67,34 @@ ok6:
 	BL		runtime·exitsyscall(SB)
 	RET
 
+// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
+// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
+TEXT	·RawSyscall6(SB),7,$0
+	MOVW	4(SP), R7	// syscall entry
+	MOVW	8(SP), R0
+	MOVW	12(SP), R1
+	MOVW	16(SP), R2
+	MOVW	20(SP), R3
+	MOVW	24(SP), R4
+	MOVW	28(SP), R5
+	SWI		$0
+	MOVW	$0xfffff001, R6
+	CMP		R6, R0
+	BLS		ok2
+	MOVW	$-1, R1
+	MOVW	R1, 32(SP)	// r1
+	MOVW	$0, R2
+	MOVW	R2, 36(SP)	// r2
+	RSB		$0, R0, R0
+	MOVW	R0, 40(SP)	// errno
+	RET
+ok2:
+	MOVW	R0, 32(SP) // r1
+	MOVW	R1, 36(SP)	// r2
+	MOVW	$0, R0
+	MOVW	R0, 40(SP)	// errno
+	RET
+
 #define SYS__LLSEEK 140  /* from zsysnum_linux_arm.go */
 // func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 // Implemented in assembly to avoid allocation when

src/pkg/syscall/mksyscall.sh

@@ -13,6 +13,12 @@
 #	  the (x, y, z int) shorthand is not allowed.
 #	* If the return parameter is an error number, it must be named errno.
 
+# A line beginning with //sysnb is like //sys, except that the
+# goroutine will not be suspended during the execution of the system
+# call.  This must only be used for system calls which can never
+# block, as otherwise the system call could cause all goroutines to
+# hang.
+
 $cmdline = "mksyscall.sh " . join(' ', @ARGV);
 $errors = 0;
 $_32bit = "";
@@ -61,17 +67,18 @@ while(<>) {
 	s/\s+/ /g;
 	s/^\s+//;
 	s/\s+$//;
-	next if !/^\/\/sys /;
+	my $nonblock = /^\/\/sysnb /;
+	next if !/^\/\/sys / && !$nonblock;
 
 	# Line must be of the form
 	#	func Open(path string, mode int, perm int) (fd int, errno int)
 	# Split into name, in params, out params.
-	if(!/^\/\/sys (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(SYS_[A-Z0-9_]+))?$/) {
+	if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(SYS_[A-Z0-9_]+))?$/) {
 		print STDERR "$ARGV:$.: malformed //sys declaration\n";
 		$errors = 1;
 		next;
 	}
-	my ($func, $in, $out, $sysname) = ($1, $2, $3, $4);
+	my ($func, $in, $out, $sysname) = ($2, $3, $4, $5);
 
 	# Split argument lists on comma.
 	my @in = parseparamlist($in);
@@ -119,12 +126,15 @@ while(<>) {
 
 	# Determine which form to use; pad args with zeros.
 	my $asm = "Syscall";
+	if ($nonblock) {
+		$asm = "RawSyscall";
+	}
 	if(@args <= 3) {
 		while(@args < 3) {
 			push @args, "0";
 		}
 	} elsif(@args <= 6) {
-		$asm = "Syscall6";
+		$asm .= "6";
 		while(@args < 6) {
 			push @args, "0";
 		}

src/pkg/syscall/syscall_bsd.go

@@ -27,8 +27,8 @@ func Getwd() (string, int) { return "", ENOTSUP }
  * Wrapped
  */
 
-//sys	getgroups(ngid int, gid *_Gid_t) (n int, errno int)
-//sys	setgroups(ngid int, gid *_Gid_t) (errno int)
+//sysnb	getgroups(ngid int, gid *_Gid_t) (n int, errno int)
+//sysnb	setgroups(ngid int, gid *_Gid_t) (errno int)
 
 func Getgroups() (gids []int, errno int) {
 	n, err := getgroups(0, nil)
@@ -130,7 +130,7 @@ func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int,
 	return
 }
 
-//sys	pipe() (r int, w int, errno int)
+//sysnb	pipe() (r int, w int, errno int)
 
 func Pipe(p []int) (errno int) {
 	if len(p) != 2 {
@@ -148,10 +148,10 @@ func Sleep(ns 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)
-//sys	socket(domain int, typ int, proto int) (fd int, errno int)
+//sysnb	socket(domain int, typ int, proto int) (fd int, errno int)
 //sys	setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
-//sys	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
-//sys	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
 //sys	Shutdown(s int, how int) (errno int)
 
 // For testing: clients can set this flag to force
@@ -355,7 +355,7 @@ func Socket(domain, typ, proto int) (fd, errno int) {
 	return
 }
 
-//sys socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
+//sysnb socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
 
 func Socketpair(domain, typ, proto int) (fd [2]int, errno int) {
 	errno = socketpair(domain, typ, proto, &fd)

src/pkg/syscall/syscall_darwin.go

@@ -45,8 +45,8 @@ func Kill(pid int, signum int) (errno int) { return kill(pid, signum, 1) }
 //sys	Chown(path string, uid int, gid int) (errno int)
 //sys	Chroot(path string) (errno int)
 //sys	Close(fd int) (errno int)
-//sys	Dup(fd int) (nfd int, errno int)
-//sys	Dup2(from int, to int) (errno int)
+//sysnb	Dup(fd int) (nfd int, errno int)
+//sysnb	Dup2(from int, to int) (errno int)
 //sys	Exchangedata(path1 string, path2 string, options int) (errno int)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (errno int)
@@ -61,20 +61,20 @@ func Kill(pid int, signum int) (errno int) { return kill(pid, signum, 1) }
 //sys	Ftruncate(fd int, length int64) (errno int)
 //sys	Getdirentries(fd int, buf []byte, basep *uintptr) (n int, errno int) = SYS_GETDIRENTRIES64
 //sys	Getdtablesize() (size int)
-//sys	Getegid() (egid int)
-//sys	Geteuid() (uid int)
+//sysnb	Getegid() (egid int)
+//sysnb	Geteuid() (uid int)
 //sys	Getfsstat(buf []Statfs_t, flags int) (n int, errno int) = SYS_GETFSSTAT64
-//sys	Getgid() (gid int)
-//sys	Getpgid(pid int) (pgid int, errno int)
-//sys	Getpgrp() (pgrp int)
-//sys	Getpid() (pid int)
-//sys	Getppid() (ppid int)
+//sysnb	Getgid() (gid int)
+//sysnb	Getpgid(pid int) (pgid int, errno int)
+//sysnb	Getpgrp() (pgrp int)
+//sysnb	Getpid() (pid int)
+//sysnb	Getppid() (ppid int)
 //sys	Getpriority(which int, who int) (prio int, errno int)
-//sys	Getrlimit(which int, lim *Rlimit) (errno int)
-//sys	Getrusage(who int, rusage *Rusage) (errno int)
-//sys	Getsid(pid int) (sid int, errno int)
-//sys	Getuid() (uid int)
-//sys	Issetugid() (tainted bool)
+//sysnb	Getrlimit(which int, lim *Rlimit) (errno int)
+//sysnb	Getrusage(who int, rusage *Rusage) (errno int)
+//sysnb	Getsid(pid int) (sid int, errno int)
+//sysnb	Getuid() (uid int)
+//sysnb	Issetugid() (tainted bool)
 //sys	Kqueue() (fd int, errno int)
 //sys	Lchown(path string, uid int, gid int) (errno int)
 //sys	Link(path string, link string) (errno int)
@@ -95,18 +95,18 @@ func Kill(pid int, signum int) (errno int) { return kill(pid, signum, 1) }
 //sys	Seek(fd int, offset int64, whence int) (newoffset int64, errno int) = SYS_LSEEK
 //sys	Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (errno int)
 //sys	Setegid(egid int) (errno int)
-//sys	Seteuid(euid int) (errno int)
-//sys	Setgid(gid int) (errno int)
+//sysnb	Seteuid(euid int) (errno int)
+//sysnb	Setgid(gid int) (errno int)
 //sys	Setlogin(name string) (errno int)
-//sys	Setpgid(pid int, pgid int) (errno int)
+//sysnb	Setpgid(pid int, pgid int) (errno int)
 //sys	Setpriority(which int, who int, prio int) (errno int)
 //sys	Setprivexec(flag int) (errno int)
-//sys	Setregid(rgid int, egid int) (errno int)
-//sys	Setreuid(ruid int, euid int) (errno int)
-//sys	Setrlimit(which int, lim *Rlimit) (errno int)
-//sys	Setsid() (pid int, errno int)
-//sys	Settimeofday(tp *Timeval) (errno int)
-//sys	Setuid(uid int) (errno int)
+//sysnb	Setregid(rgid int, egid int) (errno int)
+//sysnb	Setreuid(ruid int, euid int) (errno int)
+//sysnb	Setrlimit(which int, lim *Rlimit) (errno int)
+//sysnb	Setsid() (pid int, errno int)
+//sysnb	Settimeofday(tp *Timeval) (errno int)
+//sysnb	Setuid(uid int) (errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int) = SYS_STAT64
 //sys	Statfs(path string, stat *Statfs_t) (errno int) = SYS_STATFS64
 //sys	Symlink(path string, link string) (errno int)

src/pkg/syscall/syscall_darwin_386.go

@@ -23,7 +23,7 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 	return
 }
 
-//sys	gettimeofday(tp *Timeval) (sec int32, usec int32, errno int)
+//sysnb	gettimeofday(tp *Timeval) (sec int32, usec int32, errno int)
 func Gettimeofday(tv *Timeval) (errno int) {
 	// The tv passed to gettimeofday must be non-nil
 	// but is otherwise unused.  The answers come back

src/pkg/syscall/syscall_darwin_amd64.go

@@ -23,7 +23,7 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 	return
 }
 
-//sys	gettimeofday(tp *Timeval) (sec int64, usec int32, errno int)
+//sysnb	gettimeofday(tp *Timeval) (sec int64, usec int32, errno int)
 func Gettimeofday(tv *Timeval) (errno int) {
 	// The tv passed to gettimeofday must be non-nil
 	// but is otherwise unused.  The answers come back

src/pkg/syscall/syscall_freebsd.go

@@ -37,8 +37,8 @@ type SockaddrDatalink struct {
 //sys	Chown(path string, uid int, gid int) (errno int)
 //sys	Chroot(path string) (errno int)
 //sys	Close(fd int) (errno int)
-//sys	Dup(fd int) (nfd int, errno int)
-//sys	Dup2(from int, to int) (errno int)
+//sysnb	Dup(fd int) (nfd int, errno int)
+//sysnb	Dup2(from int, to int) (errno int)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (errno int)
 //sys	Fchflags(path string, flags int) (errno int)
@@ -52,20 +52,20 @@ type SockaddrDatalink struct {
 //sys	Ftruncate(fd int, length int64) (errno int)
 //sys	Getdirentries(fd int, buf []byte, basep *uintptr) (n int, errno int)
 //sys	Getdtablesize() (size int)
-//sys	Getegid() (egid int)
-//sys	Geteuid() (uid int)
+//sysnb	Getegid() (egid int)
+//sysnb	Geteuid() (uid int)
 //sys	Getfsstat(buf []Statfs_t, flags int) (n int, errno int)
-//sys	Getgid() (gid int)
-//sys	Getpgid(pid int) (pgid int, errno int)
-//sys	Getpgrp() (pgrp int)
-//sys	Getpid() (pid int)
-//sys	Getppid() (ppid int)
+//sysnb	Getgid() (gid int)
+//sysnb	Getpgid(pid int) (pgid int, errno int)
+//sysnb	Getpgrp() (pgrp int)
+//sysnb	Getpid() (pid int)
+//sysnb	Getppid() (ppid int)
 //sys	Getpriority(which int, who int) (prio int, errno int)
-//sys	Getrlimit(which int, lim *Rlimit) (errno int)
-//sys	Getrusage(who int, rusage *Rusage) (errno int)
-//sys	Getsid(pid int) (sid int, errno int)
-//sys	Gettimeofday(tv *Timeval) (errno int)
-//sys	Getuid() (uid int)
+//sysnb	Getrlimit(which int, lim *Rlimit) (errno int)
+//sysnb	Getrusage(who int, rusage *Rusage) (errno int)
+//sysnb	Getsid(pid int) (sid int, errno int)
+//sysnb	Gettimeofday(tv *Timeval) (errno int)
+//sysnb	Getuid() (uid int)
 //sys	Issetugid() (tainted bool)
 //sys	Kill(pid int, signum int) (errno int)
 //sys	Kqueue() (fd int, errno int)
@@ -88,18 +88,18 @@ type SockaddrDatalink struct {
 //sys	Rmdir(path string) (errno int)
 //sys	Seek(fd int, offset int64, whence int) (newoffset int64, errno int) = SYS_LSEEK
 //sys	Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (errno int)
-//sys	Setegid(egid int) (errno int)
-//sys	Seteuid(euid int) (errno int)
-//sys	Setgid(gid int) (errno int)
+//sysnb	Setegid(egid int) (errno int)
+//sysnb	Seteuid(euid int) (errno int)
+//sysnb	Setgid(gid int) (errno int)
 //sys	Setlogin(name string) (errno int)
-//sys	Setpgid(pid int, pgid int) (errno int)
+//sysnb	Setpgid(pid int, pgid int) (errno int)
 //sys	Setpriority(which int, who int, prio int) (errno int)
-//sys	Setregid(rgid int, egid int) (errno int)
-//sys	Setreuid(ruid int, euid int) (errno int)
-//sys	Setrlimit(which int, lim *Rlimit) (errno int)
-//sys	Setsid() (pid int, errno int)
-//sys	Settimeofday(tp *Timeval) (errno int)
-//sys	Setuid(uid int) (errno int)
+//sysnb	Setregid(rgid int, egid int) (errno int)
+//sysnb	Setreuid(ruid int, euid int) (errno int)
+//sysnb	Setrlimit(which int, lim *Rlimit) (errno int)
+//sysnb	Setsid() (pid int, errno int)
+//sysnb	Settimeofday(tp *Timeval) (errno int)
+//sysnb	Setuid(uid int) (errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int)
 //sys	Statfs(path string, stat *Statfs_t) (errno int)
 //sys	Symlink(path string, link string) (errno int)

src/pkg/syscall/syscall_linux.go

@@ -29,7 +29,7 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, errno int)
 	return openat(dirfd, path, flags|O_LARGEFILE, mode)
 }
 
-//sys	pipe(p *[2]_C_int) (errno int)
+//sysnb	pipe(p *[2]_C_int) (errno int)
 func Pipe(p []int) (errno int) {
 	if len(p) != 2 {
 		return EINVAL
@@ -688,10 +688,10 @@ func Reboot(cmd int) (errno int) {
 //sys	Chroot(path string) (errno int)
 //sys	Close(fd int) (errno int)
 //sys	Creat(path string, mode uint32) (fd int, errno int)
-//sys	Dup(oldfd int) (fd int, errno int)
-//sys	Dup2(oldfd int, newfd int) (fd int, errno int)
-//sys	EpollCreate(size int) (fd int, errno int)
-//sys	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (errno int)
+//sysnb	Dup(oldfd int) (fd int, errno int)
+//sysnb	Dup2(oldfd int, newfd int) (fd int, errno int)
+//sysnb	EpollCreate(size int) (fd int, errno int)
+//sysnb	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (errno int)
 //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, errno int)
 //sys	Exit(code int) = SYS_EXIT_GROUP
 //sys	Faccessat(dirfd int, path string, mode uint32, flags int) (errno int)
@@ -704,18 +704,18 @@ func Reboot(cmd int) (errno int) {
 //sys	Fdatasync(fd int) (errno int)
 //sys	Fsync(fd int) (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)
-//sys	Getpid() (pid int)
-//sys	Getppid() (ppid int)
-//sys	Getrlimit(resource int, rlim *Rlimit) (errno int)
-//sys	Getrusage(who int, rusage *Rusage) (errno int)
-//sys	Gettid() (tid int)
-//sys   InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, errno int)
-//sys   InotifyInit() (fd int, errno int)
-//sys   InotifyInit1(flags int) (fd int, errno int)
-//sys   InotifyRmWatch(fd int, watchdesc uint32) (success int, errno int)
-//sys	Kill(pid int, sig int) (errno int)
+//sysnb	Getpgid(pid int) (pgid int, errno int)
+//sysnb	Getpgrp() (pid int)
+//sysnb	Getpid() (pid int)
+//sysnb	Getppid() (ppid int)
+//sysnb	Getrlimit(resource int, rlim *Rlimit) (errno int)
+//sysnb	Getrusage(who int, rusage *Rusage) (errno int)
+//sysnb	Gettid() (tid int)
+//sys	InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, errno int)
+//sysnb	InotifyInit() (fd int, errno int)
+//sysnb	InotifyInit1(flags int) (fd int, errno int)
+//sysnb	InotifyRmWatch(fd int, watchdesc uint32) (success int, errno int)
+//sysnb	Kill(pid int, sig int) (errno int)
 //sys	Klogctl(typ int, buf []byte) (n int, errno int) = SYS_SYSLOG
 //sys	Link(oldpath string, newpath string) (errno int)
 //sys	Mkdir(path string, mode uint32) (errno int)
@@ -733,19 +733,19 @@ func Reboot(cmd int) (errno int) {
 //sys	Rmdir(path string) (errno int)
 //sys	Setdomainname(p []byte) (errno int)
 //sys	Sethostname(p []byte) (errno int)
-//sys	Setpgid(pid int, pgid int) (errno int)
-//sys	Setrlimit(resource int, rlim *Rlimit) (errno int)
-//sys	Setsid() (pid int, errno int)
-//sys	Settimeofday(tv *Timeval) (errno int)
-//sys	Setuid(uid int) (errno int)
+//sysnb	Setpgid(pid int, pgid int) (errno int)
+//sysnb	Setrlimit(resource int, rlim *Rlimit) (errno int)
+//sysnb	Setsid() (pid int, errno int)
+//sysnb	Settimeofday(tv *Timeval) (errno int)
+//sysnb	Setuid(uid int) (errno int)
 //sys	Symlink(oldpath string, newpath string) (errno int)
 //sys	Sync()
-//sys	Sysinfo(info *Sysinfo_t) (errno int)
+//sysnb	Sysinfo(info *Sysinfo_t) (errno int)
 //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	Umask(mask int) (oldmask int)
-//sys	Uname(buf *Utsname) (errno int)
+//sysnb	Tgkill(tgid int, tid int, sig int) (errno int)
+//sysnb	Times(tms *Tms) (ticks uintptr, errno int)
+//sysnb	Umask(mask int) (oldmask int)
+//sysnb	Uname(buf *Utsname) (errno int)
 //sys	Unlink(path string) (errno int)
 //sys	Unlinkat(dirfd int, path string) (errno int)
 //sys	Unmount(target string, flags int) (errno int) = SYS_UMOUNT2

src/pkg/syscall/syscall_linux_386.go

@@ -31,10 +31,10 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //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
-//sys	Getuid() (uid int) = SYS_GETUID32
+//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	Ioperm(from int, num int, on int) (errno int)
 //sys	Iopl(level int) (errno int)
 //sys	Lchown(path string, uid int, gid int) (errno int) = SYS_LCHOWN32
@@ -43,17 +43,17 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //sys	Pwrite(fd int, p []byte, offset int64) (n int, errno int) = SYS_PWRITE64
 //sys	Setfsgid(gid int) (errno int) = SYS_SETFSGID32
 //sys	Setfsuid(uid int) (errno int) = SYS_SETFSUID32
-//sys	Setgid(gid int) (errno int) = SYS_SETGID32
-//sys	Setregid(rgid int, egid int) (errno int) = SYS_SETREGID32
-//sys	Setresgid(rgid int, egid int, sgid int) (errno int) = SYS_SETRESGID32
-//sys	Setresuid(ruid int, euid int, suid int) (errno int) = SYS_SETRESUID32
-//sys	Setreuid(ruid int, euid int) (errno int) = SYS_SETREUID32
+//sysnb	Setgid(gid int) (errno int) = SYS_SETGID32
+//sysnb	Setregid(rgid int, egid int) (errno int) = SYS_SETREGID32
+//sysnb	Setresgid(rgid int, egid int, sgid int) (errno int) = SYS_SETRESGID32
+//sysnb	Setresuid(ruid int, euid int, suid int) (errno int) = SYS_SETRESUID32
+//sysnb	Setreuid(ruid int, euid int) (errno int) = SYS_SETREUID32
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, errno int)
 //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
+//sysnb	getgroups(n int, list *_Gid_t) (nn int, errno int) = SYS_GETGROUPS32
+//sysnb	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
 
 // Underlying system call writes to newoffset via pointer.
@@ -61,8 +61,8 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 
 // Vsyscalls on amd64.
-//sys	Gettimeofday(tv *Timeval) (errno int)
-//sys	Time(t *Time_t) (tt Time_t, errno int)
+//sysnb	Gettimeofday(tv *Timeval) (errno int)
+//sysnb	Time(t *Time_t) (tt Time_t, errno int)
 
 // On x86 Linux, all the socket calls go through an extra indirection,
 // I think because the 5-register system call interface can't handle
@@ -93,6 +93,7 @@ const (
 )
 
 func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
+func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int)
 
 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int) {
 	fd, errno = socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
@@ -100,17 +101,17 @@ func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int) {
 }
 
 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int) {
-	_, errno = socketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
+	_, errno = rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
 	return
 }
 
 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int) {
-	_, errno = socketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
+	_, errno = rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
 	return
 }
 
 func socketpair(domain int, typ int, flags int, fd *[2]int) (errno int) {
-	_, errno = socketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0)
+	_, errno = rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0)
 	return
 }
 
@@ -125,7 +126,7 @@ func connect(s int, addr uintptr, addrlen _Socklen) (errno int) {
 }
 
 func socket(domain int, typ int, proto int) (fd int, errno int) {
-	fd, errno = socketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0)
+	fd, errno = rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0)
 	return
 }
 

src/pkg/syscall/syscall_linux_amd64.go

@@ -9,10 +9,10 @@ package syscall
 //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)
-//sys	Getuid() (uid int)
+//sysnb	Getegid() (egid int)
+//sysnb	Geteuid() (euid int)
+//sysnb	Getgid() (gid int)
+//sysnb	Getuid() (uid int)
 //sys	Ioperm(from int, num int, on int) (errno int)
 //sys	Iopl(level int) (errno int)
 //sys	Lchown(path string, uid int, gid int) (errno int)
@@ -24,11 +24,11 @@ package syscall
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int)
 //sys	Setfsgid(gid int) (errno int)
 //sys	Setfsuid(uid int) (errno int)
-//sys	Setgid(gid int) (errno int)
-//sys	Setregid(rgid int, egid int) (errno int)
-//sys	Setresgid(rgid int, egid int, sgid int) (errno int)
-//sys	Setresuid(ruid int, euid int, suid int) (errno int)
-//sys	Setreuid(ruid int, euid int) (errno int)
+//sysnb	Setgid(gid int) (errno int)
+//sysnb	Setregid(rgid int, egid int) (errno int)
+//sysnb	Setresgid(rgid int, egid int, sgid int) (errno int)
+//sysnb	Setresuid(ruid int, euid int, suid int) (errno int)
+//sysnb	Setreuid(ruid int, euid int) (errno int)
 //sys	Shutdown(fd int, how int) (errno int)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int)
@@ -38,13 +38,13 @@ package syscall
 //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)
-//sys	getgroups(n int, list *_Gid_t) (nn int, errno int)
-//sys	setgroups(n int, list *_Gid_t) (errno int)
+//sysnb	getgroups(n int, list *_Gid_t) (nn int, errno int)
+//sysnb	setgroups(n int, list *_Gid_t) (errno int)
 //sys	setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
-//sys	socket(domain int, typ int, proto int) (fd int, errno int)
-//sys	socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
-//sys	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
-//sys	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	socket(domain int, typ int, proto int) (fd int, errno int)
+//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
+//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
 //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int)
 //sys	sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int)
 //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)

src/pkg/syscall/syscall_linux_arm.go

@@ -55,15 +55,15 @@ func Seek(fd int, offset int64, whence int) (newoffset 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)
-//sys	getgroups(n int, list *_Gid_t) (nn int, errno int) = SYS_GETGROUPS32
-//sys	setgroups(n int, list *_Gid_t) (errno int) = SYS_SETGROUPS32
+//sysnb	getgroups(n int, list *_Gid_t) (nn int, errno int) = SYS_GETGROUPS32
+//sysnb	setgroups(n int, list *_Gid_t) (errno int) = SYS_SETGROUPS32
 //sys	setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int)
-//sys	socket(domain int, typ int, proto int) (fd int, errno int)
-//sys	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
-//sys	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	socket(domain int, typ int, proto int) (fd int, errno int)
+//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
 //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int)
 //sys	sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int)
-//sys	socketpair(domain int, typ int, flags int, fd *[2]int) (errno int)
+//sysnb	socketpair(domain int, typ int, flags int, fd *[2]int) (errno int)
 //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)
 //sys	sendmsg(s int, msg *Msghdr, flags int) (errno int)
 
@@ -72,21 +72,21 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, 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)
-//sys	Getuid() (uid int)
+//sysnb	Getegid() (egid int)
+//sysnb	Geteuid() (euid int)
+//sysnb	Getgid() (gid int)
+//sysnb	Getuid() (uid int)
 //sys	Lchown(path string, uid int, gid int) (errno int)
 //sys	Listen(s int, n int) (errno int)
 //sys	Lstat(path string, stat *Stat_t) (errno int) = SYS_LSTAT64
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int) = SYS__NEWSELECT
 //sys	Setfsgid(gid int) (errno int)
 //sys	Setfsuid(uid int) (errno int)
-//sys	Setgid(gid int) (errno int)
-//sys	Setregid(rgid int, egid int) (errno int)
-//sys	Setresgid(rgid int, egid int, sgid int) (errno int)
-//sys	Setresuid(ruid int, euid int, suid int) (errno int)
-//sys	Setreuid(ruid int, euid int) (errno int)
+//sysnb	Setgid(gid int) (errno int)
+//sysnb	Setregid(rgid int, egid int) (errno int)
+//sysnb	Setresgid(rgid int, egid int, sgid int) (errno int)
+//sysnb	Setresuid(ruid int, euid int, suid int) (errno int)
+//sysnb	Setreuid(ruid int, euid int) (errno int)
 //sys	Shutdown(fd int, how int) (errno int)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, errno int)
 //sys	Stat(path string, stat *Stat_t) (errno int) = SYS_STAT64
@@ -94,8 +94,8 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, errno int)
 //sys	Truncate(path string, length int64) (errno int) = SYS_TRUNCATE64
 
 // Vsyscalls on amd64.
-//sys	Gettimeofday(tv *Timeval) (errno int)
-//sys	Time(t *Time_t) (tt Time_t, errno int)
+//sysnb	Gettimeofday(tv *Timeval) (errno int)
+//sysnb	Time(t *Time_t) (tt Time_t, errno int)
 
 // TODO(kaib): add support for tracing
 func (r *PtraceRegs) PC() uint64 { return 0 }

src/pkg/syscall/syscall_unix.go

@@ -13,6 +13,7 @@ var (
 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
 func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
+func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
 
 func Errstr(errno int) string {
 	if errno < 0 || errno >= int(len(errors)) {