unix: add Poll for linux

Change-Id: I273bd852f85d204694872a1615be51dc027b97ee
Reviewed-on: https://go-review.googlesource.com/23661
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

unix/syscall_linux.go

@@ -60,6 +60,15 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 	return openat(dirfd, path, flags|O_LARGEFILE, mode)
 }
 
+//sys	poll(fds *PollFd, nfd int, timeout int) (n int, err error)
+
+func Poll(fds []PollFd, timeout int) (n int, err error) {
+	if len(fds) == 0 {
+		return poll(nil, 0, timeout)
+	}
+	return poll(&fds[0], len(fds), timeout)
+}
+
 //sys	readlinkat(dirfd int, path string, buf []byte) (n int, err error)
 
 func Readlink(path string, buf []byte) (n int, err error) {
@@ -1043,7 +1052,6 @@ func Munmap(b []byte) (err error) {
 // Newfstatat
 // Nfsservctl
 // Personality
-// Poll
 // Ppoll
 // Pselect6
 // Ptrace

unix/syscall_linux_test.go

@@ -15,6 +15,45 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+func TestPoll(t *testing.T) {
+	err := unix.Mkfifo("fifo", 0666)
+	if err != nil {
+		t.Errorf("Poll: failed to create FIFO: %v", err)
+		return
+	}
+	defer os.Remove("fifo")
+
+	f, err := os.OpenFile("fifo", os.O_RDWR, 0666)
+	if err != nil {
+		t.Errorf("Poll: failed to open FIFO: %v", err)
+		return
+	}
+	defer f.Close()
+
+	const timeout = 100
+
+	ok := make(chan bool, 1)
+	go func() {
+		select {
+		case <-time.After(10 * timeout * time.Millisecond):
+			t.Errorf("Poll: failed to timeout after %d milliseconds", 10*timeout)
+		case <-ok:
+		}
+	}()
+
+	fds := []unix.PollFd{{Fd: int32(f.Fd()), Events: unix.POLLIN}}
+	n, err := unix.Poll(fds, timeout)
+	ok <- true
+	if err != nil {
+		t.Errorf("Poll: unexpected error: %v", err)
+		return
+	}
+	if n != 0 {
+		t.Errorf("Poll: wrong number of events: got %v, expected %v", n, 0)
+		return
+	}
+}
+
 func TestTime(t *testing.T) {
 	var ut unix.Time_t
 	ut2, err := unix.Time(&ut)

unix/types_linux.go

@@ -24,6 +24,7 @@ package unix
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <netpacket/packet.h>
+#include <poll.h>
 #include <signal.h>
 #include <stdio.h>
 #include <sys/epoll.h>
@@ -430,6 +431,18 @@ const (
 	AT_SYMLINK_NOFOLLOW = C.AT_SYMLINK_NOFOLLOW
 )
 
+type PollFd C.struct_pollfd
+
+const (
+	POLLIN    = C.POLLIN
+	POLLPRI   = C.POLLPRI
+	POLLOUT   = C.POLLOUT
+	POLLRDHUP = C.POLLRDHUP
+	POLLERR   = C.POLLERR
+	POLLHUP   = C.POLLHUP
+	POLLNVAL  = C.POLLNVAL
+)
+
 // Terminal handling
 
 type Termios C.termios_t

unix/zsyscall_linux_386.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_amd64.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_arm.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_arm64.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_mips64.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_mips64le.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_ppc64.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_ppc64le.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_linux_s390x.go

@@ -53,6 +53,17 @@ func openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func poll(fds *PollFd, nfd int, timeout int) (n int, err error) {
+	r0, _, e1 := Syscall(SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfd), uintptr(timeout))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/ztypes_linux_386.go

@@ -595,6 +595,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_amd64.go

@@ -613,6 +613,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_arm.go

@@ -575,6 +575,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_arm64.go

@@ -592,6 +592,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_mips64.go

@@ -596,6 +596,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag     uint32
 	Oflag     uint32

unix/ztypes_linux_mips64le.go

@@ -596,6 +596,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag     uint32
 	Oflag     uint32

unix/ztypes_linux_ppc64.go

@@ -602,6 +602,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_ppc64le.go

@@ -602,6 +602,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32

unix/ztypes_linux_s390x.go

@@ -617,6 +617,22 @@ const (
 	AT_SYMLINK_NOFOLLOW = 0x100
 )
 
+type PollFd struct {
+	Fd      int32
+	Events  int16
+	Revents int16
+}
+
+const (
+	POLLIN    = 0x1
+	POLLPRI   = 0x2
+	POLLOUT   = 0x4
+	POLLRDHUP = 0x2000
+	POLLERR   = 0x8
+	POLLHUP   = 0x10
+	POLLNVAL  = 0x20
+)
+
 type Termios struct {
 	Iflag  uint32
 	Oflag  uint32