syscall_linux_386.go

Documentation: cmd/vendor/golang.org/x/sys/unix

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build 386 && linux
     6  
     7  package unix
     8  
     9  import (
    10  	"unsafe"
    11  )
    12  
    13  func setTimespec(sec, nsec int64) Timespec {
    14  	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
    15  }
    16  
    17  func setTimeval(sec, usec int64) Timeval {
    18  	return Timeval{Sec: int32(sec), Usec: int32(usec)}
    19  }
    20  
    21  // 64-bit file system and 32-bit uid calls
    22  // (386 default is 32-bit file system and 16-bit uid).
    23  //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
    24  //sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64
    25  //sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
    26  //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
    27  //sys	Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
    28  //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
    29  //sysnb	Getegid() (egid int) = SYS_GETEGID32
    30  //sysnb	Geteuid() (euid int) = SYS_GETEUID32
    31  //sysnb	Getgid() (gid int) = SYS_GETGID32
    32  //sysnb	Getuid() (uid int) = SYS_GETUID32
    33  //sys	Ioperm(from int, num int, on int) (err error)
    34  //sys	Iopl(level int) (err error)
    35  //sys	Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
    36  //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
    37  //sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
    38  //sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
    39  //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
    40  //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
    41  //sys	setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32
    42  //sys	setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32
    43  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
    44  //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
    45  //sys	SyncFileRange(fd int, off int64, n int64, flags int) (err error)
    46  //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
    47  //sys	Ustat(dev int, ubuf *Ustat_t) (err error)
    48  //sysnb	getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
    49  //sysnb	setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
    50  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
    51  
    52  //sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
    53  //sys	Pause() (err error)
    54  
    55  func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
    56  	page := uintptr(offset / 4096)
    57  	if offset != int64(page)*4096 {
    58  		return 0, EINVAL
    59  	}
    60  	return mmap2(addr, length, prot, flags, fd, page)
    61  }
    62  
    63  type rlimit32 struct {
    64  	Cur uint32
    65  	Max uint32
    66  }
    67  
    68  //sysnb	getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
    69  
    70  const rlimInf32 = ^uint32(0)
    71  const rlimInf64 = ^uint64(0)
    72  
    73  func Getrlimit(resource int, rlim *Rlimit) (err error) {
    74  	err = Prlimit(0, resource, nil, rlim)
    75  	if err != ENOSYS {
    76  		return err
    77  	}
    78  
    79  	rl := rlimit32{}
    80  	err = getrlimit(resource, &rl)
    81  	if err != nil {
    82  		return
    83  	}
    84  
    85  	if rl.Cur == rlimInf32 {
    86  		rlim.Cur = rlimInf64
    87  	} else {
    88  		rlim.Cur = uint64(rl.Cur)
    89  	}
    90  
    91  	if rl.Max == rlimInf32 {
    92  		rlim.Max = rlimInf64
    93  	} else {
    94  		rlim.Max = uint64(rl.Max)
    95  	}
    96  	return
    97  }
    98  
    99  func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
   100  	newoffset, errno := seek(fd, offset, whence)
   101  	if errno != 0 {
   102  		return 0, errno
   103  	}
   104  	return newoffset, nil
   105  }
   106  
   107  //sys	futimesat(dirfd int, path string, times *[2]Timeval) (err error)
   108  //sysnb	Gettimeofday(tv *Timeval) (err error)
   109  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   110  //sys	Utime(path string, buf *Utimbuf) (err error)
   111  //sys	utimes(path string, times *[2]Timeval) (err error)
   112  
   113  // On x86 Linux, all the socket calls go through an extra indirection,
   114  // I think because the 5-register system call interface can't handle
   115  // the 6-argument calls like sendto and recvfrom. Instead the
   116  // arguments to the underlying system call are the number below
   117  // and a pointer to an array of uintptr. We hide the pointer in the
   118  // socketcall assembly to avoid allocation on every system call.
   119  
   120  const (
   121  	// see linux/net.h
   122  	_SOCKET      = 1
   123  	_BIND        = 2
   124  	_CONNECT     = 3
   125  	_LISTEN      = 4
   126  	_ACCEPT      = 5
   127  	_GETSOCKNAME = 6
   128  	_GETPEERNAME = 7
   129  	_SOCKETPAIR  = 8
   130  	_SEND        = 9
   131  	_RECV        = 10
   132  	_SENDTO      = 11
   133  	_RECVFROM    = 12
   134  	_SHUTDOWN    = 13
   135  	_SETSOCKOPT  = 14
   136  	_GETSOCKOPT  = 15
   137  	_SENDMSG     = 16
   138  	_RECVMSG     = 17
   139  	_ACCEPT4     = 18
   140  	_RECVMMSG    = 19
   141  	_SENDMMSG    = 20
   142  )
   143  
   144  func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) {
   145  	fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0)
   146  	if e != 0 {
   147  		err = e
   148  	}
   149  	return
   150  }
   151  
   152  func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
   153  	_, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
   154  	if e != 0 {
   155  		err = e
   156  	}
   157  	return
   158  }
   159  
   160  func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
   161  	_, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
   162  	if e != 0 {
   163  		err = e
   164  	}
   165  	return
   166  }
   167  
   168  func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) {
   169  	_, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0)
   170  	if e != 0 {
   171  		err = e
   172  	}
   173  	return
   174  }
   175  
   176  func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
   177  	_, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
   178  	if e != 0 {
   179  		err = e
   180  	}
   181  	return
   182  }
   183  
   184  func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) {
   185  	_, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0)
   186  	if e != 0 {
   187  		err = e
   188  	}
   189  	return
   190  }
   191  
   192  func socket(domain int, typ int, proto int) (fd int, err error) {
   193  	fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0)
   194  	if e != 0 {
   195  		err = e
   196  	}
   197  	return
   198  }
   199  
   200  func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) {
   201  	_, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
   202  	if e != 0 {
   203  		err = e
   204  	}
   205  	return
   206  }
   207  
   208  func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {
   209  	_, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0)
   210  	if e != 0 {
   211  		err = e
   212  	}
   213  	return
   214  }
   215  
   216  func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) {
   217  	var base uintptr
   218  	if len(p) > 0 {
   219  		base = uintptr(unsafe.Pointer(&p[0]))
   220  	}
   221  	n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)))
   222  	if e != 0 {
   223  		err = e
   224  	}
   225  	return
   226  }
   227  
   228  func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) {
   229  	var base uintptr
   230  	if len(p) > 0 {
   231  		base = uintptr(unsafe.Pointer(&p[0]))
   232  	}
   233  	_, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen))
   234  	if e != 0 {
   235  		err = e
   236  	}
   237  	return
   238  }
   239  
   240  func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) {
   241  	n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
   242  	if e != 0 {
   243  		err = e
   244  	}
   245  	return
   246  }
   247  
   248  func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) {
   249  	n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0)
   250  	if e != 0 {
   251  		err = e
   252  	}
   253  	return
   254  }
   255  
   256  func Listen(s int, n int) (err error) {
   257  	_, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0)
   258  	if e != 0 {
   259  		err = e
   260  	}
   261  	return
   262  }
   263  
   264  func Shutdown(s, how int) (err error) {
   265  	_, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0)
   266  	if e != 0 {
   267  		err = e
   268  	}
   269  	return
   270  }
   271  
   272  func Fstatfs(fd int, buf *Statfs_t) (err error) {
   273  	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   274  	if e != 0 {
   275  		err = e
   276  	}
   277  	return
   278  }
   279  
   280  func Statfs(path string, buf *Statfs_t) (err error) {
   281  	pathp, err := BytePtrFromString(path)
   282  	if err != nil {
   283  		return err
   284  	}
   285  	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   286  	if e != 0 {
   287  		err = e
   288  	}
   289  	return
   290  }
   291  
   292  func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) }
   293  
   294  func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) }
   295  
   296  func (iov *Iovec) SetLen(length int) {
   297  	iov.Len = uint32(length)
   298  }
   299  
   300  func (msghdr *Msghdr) SetControllen(length int) {
   301  	msghdr.Controllen = uint32(length)
   302  }
   303  
   304  func (msghdr *Msghdr) SetIovlen(length int) {
   305  	msghdr.Iovlen = uint32(length)
   306  }
   307  
   308  func (cmsg *Cmsghdr) SetLen(length int) {
   309  	cmsg.Len = uint32(length)
   310  }
   311  
   312  func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) {
   313  	rsa.Service_name_len = uint32(length)
   314  }
   315
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