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Source file src/syscall/syscall_linux_arm.go

Documentation: syscall

     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  package syscall
     6  
     7  import "unsafe"
     8  
     9  const (
    10  	_SYS_dup       = SYS_DUP2
    11  	_SYS_setgroups = SYS_SETGROUPS32
    12  )
    13  
    14  func setTimespec(sec, nsec int64) Timespec {
    15  	return Timespec{Sec: int32(sec), Nsec: int32(nsec)}
    16  }
    17  
    18  func setTimeval(sec, usec int64) Timeval {
    19  	return Timeval{Sec: int32(sec), Usec: int32(usec)}
    20  }
    21  
    22  func Pipe(p []int) (err error) {
    23  	if len(p) != 2 {
    24  		return EINVAL
    25  	}
    26  	var pp [2]_C_int
    27  	err = pipe2(&pp, 0)
    28  	p[0] = int(pp[0])
    29  	p[1] = int(pp[1])
    30  	return
    31  }
    32  
    33  //sysnb pipe2(p *[2]_C_int, flags int) (err error)
    34  
    35  func Pipe2(p []int, flags int) (err error) {
    36  	if len(p) != 2 {
    37  		return EINVAL
    38  	}
    39  	var pp [2]_C_int
    40  	err = pipe2(&pp, flags)
    41  	p[0] = int(pp[0])
    42  	p[1] = int(pp[1])
    43  	return
    44  }
    45  
    46  // Underlying system call writes to newoffset via pointer.
    47  // Implemented in assembly to avoid allocation.
    48  func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)
    49  
    50  func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
    51  	newoffset, errno := seek(fd, offset, whence)
    52  	if errno != 0 {
    53  		return 0, errno
    54  	}
    55  	return newoffset, nil
    56  }
    57  
    58  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
    59  //sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error)
    60  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    61  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
    62  //sysnb	getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32
    63  //sysnb	setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32
    64  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
    65  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
    66  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
    67  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    68  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
    69  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
    70  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
    71  //sysnb	socketpair(domain int, typ int, flags int, fd *[2]int32) (err error)
    72  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
    73  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
    74  
    75  // 64-bit file system and 32-bit uid calls
    76  // (16-bit uid calls are not always supported in newer kernels)
    77  //sys	Dup2(oldfd int, newfd int) (err error)
    78  //sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
    79  //sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
    80  //sysnb	Getegid() (egid int) = SYS_GETEGID32
    81  //sysnb	Geteuid() (euid int) = SYS_GETEUID32
    82  //sysnb	Getgid() (gid int) = SYS_GETGID32
    83  //sysnb	Getuid() (uid int) = SYS_GETUID32
    84  //sysnb	InotifyInit() (fd int, err error)
    85  //sys	Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32
    86  //sys	Listen(s int, n int) (err error)
    87  //sys	Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
    88  //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
    89  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
    90  //sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
    91  //sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
    92  //sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
    93  //sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
    94  //sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
    95  //sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32
    96  //sys	Shutdown(fd int, how int) (err error)
    97  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
    98  //sys	Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
    99  
   100  // Vsyscalls on amd64.
   101  //sysnb	Gettimeofday(tv *Timeval) (err error)
   102  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   103  
   104  //sys   Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
   105  //sys   Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
   106  //sys	Truncate(path string, length int64) (err error) = SYS_TRUNCATE64
   107  //sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64
   108  
   109  //sys	mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error)
   110  
   111  func Fstatfs(fd int, buf *Statfs_t) (err error) {
   112  	_, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   113  	if e != 0 {
   114  		err = e
   115  	}
   116  	return
   117  }
   118  
   119  func Statfs(path string, buf *Statfs_t) (err error) {
   120  	pathp, err := BytePtrFromString(path)
   121  	if err != nil {
   122  		return err
   123  	}
   124  	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
   125  	if e != 0 {
   126  		err = e
   127  	}
   128  	return
   129  }
   130  
   131  func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
   132  	page := uintptr(offset / 4096)
   133  	if offset != int64(page)*4096 {
   134  		return 0, EINVAL
   135  	}
   136  	return mmap2(addr, length, prot, flags, fd, page)
   137  }
   138  
   139  type rlimit32 struct {
   140  	Cur uint32
   141  	Max uint32
   142  }
   143  
   144  //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
   145  
   146  const rlimInf32 = ^uint32(0)
   147  const rlimInf64 = ^uint64(0)
   148  
   149  func Getrlimit(resource int, rlim *Rlimit) (err error) {
   150  	err = prlimit(0, resource, nil, rlim)
   151  	if err != ENOSYS {
   152  		return err
   153  	}
   154  
   155  	rl := rlimit32{}
   156  	err = getrlimit(resource, &rl)
   157  	if err != nil {
   158  		return
   159  	}
   160  
   161  	if rl.Cur == rlimInf32 {
   162  		rlim.Cur = rlimInf64
   163  	} else {
   164  		rlim.Cur = uint64(rl.Cur)
   165  	}
   166  
   167  	if rl.Max == rlimInf32 {
   168  		rlim.Max = rlimInf64
   169  	} else {
   170  		rlim.Max = uint64(rl.Max)
   171  	}
   172  	return
   173  }
   174  
   175  //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
   176  
   177  func Setrlimit(resource int, rlim *Rlimit) (err error) {
   178  	err = prlimit(0, resource, rlim, nil)
   179  	if err != ENOSYS {
   180  		return err
   181  	}
   182  
   183  	rl := rlimit32{}
   184  	if rlim.Cur == rlimInf64 {
   185  		rl.Cur = rlimInf32
   186  	} else if rlim.Cur < uint64(rlimInf32) {
   187  		rl.Cur = uint32(rlim.Cur)
   188  	} else {
   189  		return EINVAL
   190  	}
   191  	if rlim.Max == rlimInf64 {
   192  		rl.Max = rlimInf32
   193  	} else if rlim.Max < uint64(rlimInf32) {
   194  		rl.Max = uint32(rlim.Max)
   195  	} else {
   196  		return EINVAL
   197  	}
   198  
   199  	return setrlimit(resource, &rl)
   200  }
   201  
   202  func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }
   203  
   204  func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }
   205  
   206  func (iov *Iovec) SetLen(length int) {
   207  	iov.Len = uint32(length)
   208  }
   209  
   210  func (msghdr *Msghdr) SetControllen(length int) {
   211  	msghdr.Controllen = uint32(length)
   212  }
   213  
   214  func (cmsg *Cmsghdr) SetLen(length int) {
   215  	cmsg.Len = uint32(length)
   216  }
   217  
   218  func rawVforkSyscall(trap, a1 uintptr) (r1 uintptr, err Errno) {
   219  	panic("not implemented")
   220  }
   221  

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