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mirror of https://github.com/golang/go synced 2024-10-04 16:21:22 -06:00
go/src/pkg/syscall/syscall_linux.go
Robert Griesemer d65a5cce89 1) Change default gofmt default settings for
parsing and printing to new syntax.

   Use -oldparser to parse the old syntax,
   use -oldprinter to print the old syntax.

2) Change default gofmt formatting settings
   to use tabs for indentation only and to use
   spaces for alignment. This will make the code
   alignment insensitive to an editor's tabwidth.

   Use -spaces=false to use tabs for alignment.

3) Manually changed src/exp/parser/parser_test.go
   so that it doesn't try to parse the parser's
   source files using the old syntax (they have
   new syntax now).

4) gofmt -w src misc test/bench

4th set of files.

R=rsc
CC=golang-dev
https://golang.org/cl/180049
2009-12-15 15:40:16 -08:00

769 lines
19 KiB
Go

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Linux system calls.
// This file is compiled as ordinary Go code,
// but it is also input to mksyscall,
// which parses the //sys lines and generates system call stubs.
// Note that sometimes we use a lowercase //sys name and
// wrap it in our own nicer implementation.
package syscall
import "unsafe"
const OS = "linux"
/*
* Wrapped
*/
//sys pipe(p *[2]_C_int) (errno int)
func Pipe(p []int) (errno int) {
if len(p) != 2 {
return EINVAL
}
var pp [2]_C_int
errno = pipe(&pp)
p[0] = int(pp[0])
p[1] = int(pp[1])
return
}
//sys utimes(path string, times *[2]Timeval) (errno int)
func Utimes(path string, tv []Timeval) (errno int) {
if len(tv) != 2 {
return EINVAL
}
return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
}
//sys futimesat(dirfd int, path string, times *[2]Timeval) (errno int)
func Futimesat(dirfd int, path string, tv []Timeval) (errno int) {
if len(tv) != 2 {
return EINVAL
}
return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
}
const ImplementsGetwd = true
//sys Getcwd(buf []byte) (n int, errno int)
func Getwd() (wd string, errno int) {
var buf [PathMax]byte
n, err := Getcwd(&buf)
if err != 0 {
return "", err
}
// Getcwd returns the number of bytes written to buf, including the NUL.
if n < 1 || n > len(buf) || buf[n-1] != 0 {
return "", EINVAL
}
return string(buf[0 : n-1]), 0
}
func Getgroups() (gids []int, errno int) {
n, err := getgroups(0, nil)
if err != 0 {
return nil, errno
}
if n == 0 {
return nil, 0
}
// Sanity check group count. Max is 1<<16 on Linux.
if n < 0 || n > 1<<20 {
return nil, EINVAL
}
a := make([]_Gid_t, n)
n, err = getgroups(n, &a[0])
if err != 0 {
return nil, errno
}
gids = make([]int, n)
for i, v := range a[0:n] {
gids[i] = int(v)
}
return
}
func Setgroups(gids []int) (errno int) {
if len(gids) == 0 {
return setgroups(0, nil)
}
a := make([]_Gid_t, len(gids))
for i, v := range gids {
a[i] = _Gid_t(v)
}
return setgroups(len(a), &a[0])
}
type WaitStatus uint32
// Wait status is 7 bits at bottom, either 0 (exited),
// 0x7F (stopped), or a signal number that caused an exit.
// The 0x80 bit is whether there was a core dump.
// An extra number (exit code, signal causing a stop)
// is in the high bits. At least that's the idea.
// There are various irregularities. For example, the
// "continued" status is 0xFFFF, distinguishing itself
// from stopped via the core dump bit.
const (
mask = 0x7F
core = 0x80
exited = 0x00
stopped = 0x7F
shift = 8
)
func (w WaitStatus) Exited() bool { return w&mask == exited }
func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
func (w WaitStatus) Continued() bool { return w == 0xFFFF }
func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
func (w WaitStatus) ExitStatus() int {
if !w.Exited() {
return -1
}
return int(w>>shift) & 0xFF
}
func (w WaitStatus) Signal() int {
if !w.Signaled() {
return -1
}
return int(w & mask)
}
func (w WaitStatus) StopSignal() int {
if !w.Stopped() {
return -1
}
return int(w>>shift) & 0xFF
}
func (w WaitStatus) TrapCause() int {
if w.StopSignal() != SIGTRAP {
return -1
}
return int(w>>shift) >> 8
}
//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, errno int)
func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, errno int) {
var status _C_int
wpid, errno = wait4(pid, &status, options, rusage)
if wstatus != nil {
*wstatus = WaitStatus(status)
}
return
}
func Sleep(nsec int64) (errno int) {
tv := NsecToTimeval(nsec)
_, err := Select(0, nil, nil, nil, &tv)
return err
}
// For testing: clients can set this flag to force
// creation of IPv6 sockets to return EAFNOSUPPORT.
var SocketDisableIPv6 bool
type Sockaddr interface {
sockaddr() (ptr uintptr, len _Socklen, errno int) // lowercase; only we can define Sockaddrs
}
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
func (sa *SockaddrInet4) sockaddr() (uintptr, _Socklen, int) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return 0, 0, EINVAL
}
sa.raw.Family = AF_INET
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return uintptr(unsafe.Pointer(&sa.raw)), SizeofSockaddrInet4, 0
}
type SockaddrInet6 struct {
Port int
Addr [16]byte
raw RawSockaddrInet6
}
func (sa *SockaddrInet6) sockaddr() (uintptr, _Socklen, int) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return 0, 0, EINVAL
}
sa.raw.Family = AF_INET6
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return uintptr(unsafe.Pointer(&sa.raw)), SizeofSockaddrInet6, 0
}
type SockaddrUnix struct {
Name string
raw RawSockaddrUnix
}
func (sa *SockaddrUnix) sockaddr() (uintptr, _Socklen, int) {
name := sa.Name
n := len(name)
if n >= len(sa.raw.Path) || n == 0 {
return 0, 0, EINVAL
}
sa.raw.Family = AF_UNIX
for i := 0; i < n; i++ {
sa.raw.Path[i] = int8(name[i])
}
if sa.raw.Path[0] == '@' {
sa.raw.Path[0] = 0
}
// length is family, name, NUL.
return uintptr(unsafe.Pointer(&sa.raw)), 1 + _Socklen(n) + 1, 0
}
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
switch rsa.Addr.Family {
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
sa := new(SockaddrUnix)
if pp.Path[0] == 0 {
// "Abstract" Unix domain socket.
// Rewrite leading NUL as @ for textual display.
// (This is the standard convention.)
// Not friendly to overwrite in place,
// but the callers below don't care.
pp.Path[0] = '@'
}
// Assume path ends at NUL.
// This is not technically the Linux semantics for
// abstract Unix domain sockets--they are supposed
// to be uninterpreted fixed-size binary blobs--but
// everyone uses this convention.
n := 0
for n < len(pp.Path) && pp.Path[n] != 0 {
n++
}
bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
sa.Name = string(bytes[0:n])
return sa, 0
case AF_INET:
pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
sa := new(SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, 0
case AF_INET6:
pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
sa := new(SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, 0
}
return nil, EAFNOSUPPORT
}
func Accept(fd int) (nfd int, sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
nfd, errno = accept(fd, &rsa, &len)
if errno != 0 {
return
}
sa, errno = anyToSockaddr(&rsa)
if errno != 0 {
Close(nfd)
nfd = 0
}
return
}
func Getsockname(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if errno = getsockname(fd, &rsa, &len); errno != 0 {
return
}
return anyToSockaddr(&rsa)
}
func Getpeername(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if errno = getpeername(fd, &rsa, &len); errno != 0 {
return
}
return anyToSockaddr(&rsa)
}
func Bind(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr()
if err != 0 {
return err
}
return bind(fd, ptr, n)
}
func Connect(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr()
if err != 0 {
return err
}
return connect(fd, ptr, n)
}
func Socket(domain, typ, proto int) (fd, errno int) {
if domain == AF_INET6 && SocketDisableIPv6 {
return -1, EAFNOSUPPORT
}
fd, errno = socket(domain, typ, proto)
return
}
func SetsockoptInt(fd, level, opt int, value int) (errno int) {
var n = int32(value)
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&n)), 4)
}
func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(tv)), unsafe.Sizeof(*tv))
}
func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(l)), unsafe.Sizeof(*l))
}
func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if n, errno = recvfrom(fd, p, flags, &rsa, &len); errno != 0 {
return
}
from, errno = anyToSockaddr(&rsa)
return
}
func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
ptr, n, err := to.sockaddr()
if err != 0 {
return err
}
return sendto(fd, p, flags, ptr, n)
}
//sys ptrace(request int, pid int, addr uintptr, data uintptr) (errno int)
func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, errno int) {
// The peek requests are machine-size oriented, so we wrap it
// to retrieve arbitrary-length data.
// The ptrace syscall differs from glibc's ptrace.
// Peeks returns the word in *data, not as the return value.
var buf [sizeofPtr]byte
// Leading edge. PEEKTEXT/PEEKDATA don't require aligned
// access (PEEKUSER warns that it might), but if we don't
// align our reads, we might straddle an unmapped page
// boundary and not get the bytes leading up to the page
// boundary.
n := 0
if addr%sizeofPtr != 0 {
errno = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
if errno != 0 {
return 0, errno
}
n += copy(out, buf[addr%sizeofPtr:])
out = out[n:]
}
// Remainder.
for len(out) > 0 {
// We use an internal buffer to gaurantee alignment.
// It's not documented if this is necessary, but we're paranoid.
errno = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
if errno != 0 {
return n, errno
}
copied := copy(out, &buf)
n += copied
out = out[copied:]
}
return n, 0
}
func PtracePeekText(pid int, addr uintptr, out []byte) (count int, errno int) {
return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
}
func PtracePeekData(pid int, addr uintptr, out []byte) (count int, errno int) {
return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
}
func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, errno int) {
// As for ptracePeek, we need to align our accesses to deal
// with the possibility of straddling an invalid page.
// Leading edge.
n := 0
if addr%sizeofPtr != 0 {
var buf [sizeofPtr]byte
errno = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
if errno != 0 {
return 0, errno
}
n += copy(buf[addr%sizeofPtr:], data)
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
errno = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
if errno != 0 {
return 0, errno
}
data = data[n:]
}
// Interior.
for len(data) > sizeofPtr {
word := *((*uintptr)(unsafe.Pointer(&data[0])))
errno = ptrace(pokeReq, pid, addr+uintptr(n), word)
if errno != 0 {
return n, errno
}
n += sizeofPtr
data = data[sizeofPtr:]
}
// Trailing edge.
if len(data) > 0 {
var buf [sizeofPtr]byte
errno = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
if errno != 0 {
return n, errno
}
copy(&buf, data)
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
errno = ptrace(pokeReq, pid, addr+uintptr(n), word)
if errno != 0 {
return n, errno
}
n += len(data)
}
return n, 0
}
func PtracePokeText(pid int, addr uintptr, data []byte) (count int, errno int) {
return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
}
func PtracePokeData(pid int, addr uintptr, data []byte) (count int, errno int) {
return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
}
func PtraceGetRegs(pid int, regsout *PtraceRegs) (errno int) {
return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout)))
}
func PtraceSetRegs(pid int, regs *PtraceRegs) (errno int) {
return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs)))
}
func PtraceSetOptions(pid int, options int) (errno int) {
return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
}
func PtraceGetEventMsg(pid int) (msg uint, errno int) {
var data _C_long
errno = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
msg = uint(data)
return
}
func PtraceCont(pid int, signal int) (errno int) {
return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
}
func PtraceSingleStep(pid int) (errno int) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
func PtraceAttach(pid int) (errno int) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
// Sendto
// Recvfrom
// Sendmsg
// Recvmsg
// Socketpair
// Getsockopt
/*
* Direct access
*/
//sys Access(path string, mode int) (errno int)
//sys Acct(path string) (errno int)
//sys Adjtimex(buf *Timex) (state int, errno int)
//sys Chdir(path string) (errno int)
//sys Chmod(path string, mode int) (errno int)
//sys Chroot(path string) (errno int)
//sys Close(fd int) (errno int)
//sys Creat(path string, mode int) (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)
//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 int, flags int) (errno int)
//sys Fallocate(fd int, mode int, off int64, len int64) (errno int)
//sys Fchdir(fd int) (errno int)
//sys Fchmod(fd int, mode int) (errno int)
//sys Fchmodat(dirfd int, path string, mode int, flags int) (errno int)
//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (errno int)
//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)
//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 Gettimeofday(tv *Timeval) (errno int)
//sys 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 int) (errno int)
//sys Mkdirat(dirfd int, path string, mode int) (errno int)
//sys Mknod(path string, mode int, dev int) (errno int)
//sys Mknodat(dirfd int, path string, mode int, dev int) (errno int)
//sys Nanosleep(time *Timespec, leftover *Timespec) (errno int)
//sys Open(path string, mode int, perm int) (fd int, errno int)
//sys Openat(dirfd int, path string, flags int, mode int) (fd int, errno int)
//sys Pause() (errno int)
//sys PivotRoot(newroot string, putold string) (errno int) = SYS_PIVOT_ROOT
//sys Pread(fd int, p []byte, offset int64) (n int, errno int) = SYS_PREAD64
//sys Pwrite(fd int, p []byte, offset int64) (n int, errno int) = SYS_PWRITE64
//sys Read(fd int, p []byte) (n int, errno int)
//sys Readlink(path string, buf []byte) (n int, errno int)
//sys Rename(oldpath string, newpath string) (errno int)
//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (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)
//sys Settimeofday(tv *Timeval) (errno int)
//sys Setuid(uid int) (errno int)
//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, errno int)
//sys Symlink(oldpath string, newpath string) (errno int)
//sys Sync()
//sys 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 Time(t *Time_t) (tt Time_t, 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)
//sys Unlinkat(dirfd int, path string) (errno int)
//sys Unshare(flags int) (errno int)
//sys Ustat(dev int, ubuf *Ustat_t) (errno int)
//sys Utime(path string, buf *Utimbuf) (errno int)
//sys Write(fd int, p []byte) (n int, errno int)
//sys exitThread(code int) (errno int) = SYS_EXIT
//sys read(fd int, p *byte, np int) (n int, errno int)
//sys write(fd int, p *byte, np int) (n int, errno int)
/*
* Unimplemented
*/
// AddKey
// AfsSyscall
// Alarm
// ArchPrctl
// Brk
// Capget
// Capset
// ClockGetres
// ClockGettime
// ClockNanosleep
// ClockSettime
// Clone
// CreateModule
// DeleteModule
// EpollCtlOld
// EpollPwait
// EpollWaitOld
// Eventfd
// Execve
// Fadvise64
// Fgetxattr
// Flistxattr
// Flock
// Fork
// Fremovexattr
// Fsetxattr
// Futex
// GetKernelSyms
// GetMempolicy
// GetRobustList
// GetThreadArea
// Getitimer
// Getpmsg
// Getpriority
// Getxattr
// InotifyAddWatch
// InotifyInit
// InotifyRmWatch
// IoCancel
// IoDestroy
// IoGetevents
// IoSetup
// IoSubmit
// Ioctl
// IoprioGet
// IoprioSet
// KexecLoad
// Keyctl
// Lgetxattr
// Listxattr
// Llistxattr
// LookupDcookie
// Lremovexattr
// Lsetxattr
// Madvise
// Mbind
// MigratePages
// Mincore
// Mlock
// Mmap
// ModifyLdt
// Mount
// MovePages
// Mprotect
// MqGetsetattr
// MqNotify
// MqOpen
// MqTimedreceive
// MqTimedsend
// MqUnlink
// Mremap
// Msgctl
// Msgget
// Msgrcv
// Msgsnd
// Msync
// Munlock
// Munlockall
// Munmap
// Newfstatat
// Nfsservctl
// Personality
// Poll
// Ppoll
// Prctl
// Pselect6
// Ptrace
// Putpmsg
// QueryModule
// Quotactl
// Readahead
// Readv
// Reboot
// RemapFilePages
// Removexattr
// RequestKey
// RestartSyscall
// RtSigaction
// RtSigpending
// RtSigprocmask
// RtSigqueueinfo
// RtSigreturn
// RtSigsuspend
// RtSigtimedwait
// SchedGetPriorityMax
// SchedGetPriorityMin
// SchedGetaffinity
// SchedGetparam
// SchedGetscheduler
// SchedRrGetInterval
// SchedSetaffinity
// SchedSetparam
// SchedYield
// Security
// Semctl
// Semget
// Semop
// Semtimedop
// Sendfile
// SetMempolicy
// SetRobustList
// SetThreadArea
// SetTidAddress
// Setpriority
// Setxattr
// Shmat
// Shmctl
// Shmdt
// Shmget
// Sigaltstack
// Signalfd
// Swapoff
// Swapon
// Sysfs
// TimerCreate
// TimerDelete
// TimerGetoverrun
// TimerGettime
// TimerSettime
// Timerfd
// Tkill (obsolete)
// Tuxcall
// Umount2
// Uselib
// Utimensat
// Vfork
// Vhangup
// Vmsplice
// Vserver
// Waitid
// Writev
// _Sysctl